TECHNICAL FIELD OF THE INVENTION

[0001] The present invention relates to the field of energy recovery. More particularly, it relates to an energy recovery assembly, to an energy recovery ventilation system including such an energy recovery assembly and to a method of operation for the same.

BACKGROUND

[0002] In the field of ventilation, it is known to use ventilation systems in order to help maintaining adequate indoor air quality in buildings, such as industrial buildings, commercial buildings, farming facilities, residential houses and the like. Such ventilation systems are commonly used to, amongst others, prevent stagnation of the inside air of the building via the intake of fresh outside air and the corresponding exhaust of inside air.

[0003] Given that, in many cases, there is a temperature and/or humidity difference between the supply air brought into the building by the ventilation system and the outgoing exhaust air exhausted by the ventilation system, the ventilation systems are commonly required to control the temperature and/or humidity level of the supply air brought inside the building in order to maintain a constant temperature and/or humidity level inside the building. Such control substantially impacts the energy consumption of the ventilation system, as it commonly requires, for example, the heating/cooling of the supply air before it is distributed inside the building.

[0004] Over the years, many types of heat recovery ventilation systems have been developed in order to minimize the energy consumption required to regulate the temperature and humidity level of the supply air brought into the building by the ventilation system. In such ventilation systems, heat exchange and/or humidity exchange is performed between the outgoing exhaust air and the incoming supply air, for example through the use of heat recovery wheel, non-rotating cross-flow heat exchangers, and the like.

[0005] Known heat recovery ventilation systems however tend to suffer from several drawbacks. For example, such drawbacks include high maintenance costs (e.g. maintenance costs due to the periodical replacement/cleaning of filters or cassettes to remove the accumulated dust and/or debris) and/or extended down time periods periodically required to proceed to maintenance thereof. Moreover, these systems commonly lack the capacity to provide free cooling, when the outside air is warmer than the inside air (i.e. when the temperature outside of the building is greater than the inner temperature of the building).

[0006] Similar drawbacks regarding the above described maintenance issues also apply to heat recovery assemblies used to minimize the energy consumption required to regulate the temperature and/or humidity in high heat apertures having intake/exhaust of air therefrom, such as, for example and without being limitative, industrial ovens.

[0007] In view of the above, there is a need for an improved energy recovery assembly to be used in an energy recovery ventilation system, for an energy recovery ventilation system including such an energy recovery assembly and for a method of operation for the same, which would be able to overcome or at least minimize some of the above-discussed prior art concerns.

BRIEF SUMMARY OF THE INVENTION

[0008] According to a first general aspect, there is provided an energy recovery assembly for transferring thermal energy between outgoing exhaust air and incoming supply air, in an energy recovery ventilation system having at least one air transfer path through which the outgoing exhaust air and the incoming supply air flow sequentially. The energy recovery assembly comprises a plurality of beads, a bead receiving conduit section, at least one bead inlet for each bead receiving conduit section and at least one bead outlet for each bead receiving conduit section. Each one of the plurality of beads is made of thermal conductive material. The bead receiving conduit section is positioned across each one of the at least one air transfer path of the ventilation system. The bead receiving conduit section is configured to receive and retain corresponding ones of the plurality of beads therein. Each one of the at least one bead inlet is configurable between an open configuration allowing introduction of the corresponding ones of the plurality of beads in the bead receiving conduit section and a closed configuration where the at least one bead inlet closes the bead receiving conduit section and prevents introduction of the corresponding ones of the plurality of beads therein. Each one of the at least one bead outlet is configurable between an open configuration allowing removal of the corresponding ones of the plurality of beads from the bead receiving conduit section and a closed configuration where the at least one bead outlet closes the bead receiving conduit section and prevents removal of the corresponding ones of the plurality of beads therefrom.

[0009] In an embodiment, each bead receiving conduit section comprises at least two bead receiving chambers. Each one of the at least two bead receiving chambers is configured to receive and retain a subset of the corresponding ones of the plurality of beads.

[0010] In an embodiment, each one of the at least two bead receiving chambers is operatively connected to one of the at least one bead inlet and one of the at least one bead outlet.

[0011] In an embodiment, each one of the plurality of beads has a substantially spherical shape.

[0012] In an embodiment, each one of the plurality of beads comprises at least one through hole extending therethrough.

[0013] In an embodiment, each one of the plurality of beads has a substantially isogonal polyhedron shape with at least two open faces and a hollow core. [0014] In an embodiment, each one of the plurality of beads has a substantially 0- ring shape.

[0015] In an embodiment, the plurality of beads is divided in at least two bead material subsets, each comprising beads made of a distinct thermal conductive material. The beads of each one of the at least two bead material subsets are received in a distinct bead receiving conduit section.

[0016] In an embodiment, the plurality of beads is divided in at least two bead size subsets, each comprising beads having a distinct size. The beads of each one of the at least two bead size subsets are received in a distinct bead receiving conduit section.

[0017] According to another general aspect, there is provided an energy recovery ventilation system having at least one air transfer path through which outgoing exhaust air and incoming supply air flow sequentially. The energy recovery ventilation system comprises a ventilation assembly and an energy recovery assembly. The ventilation assembly comprises at least one ventilation unit operating to generate an airflow along the at least one air transfer path and at least one conduit defining the at least one air transfer path. The energy recovery assembly comprises a plurality of beads, a bead receiving conduit section for each one of the at least one conduit defining the at least one air transfer path, at least one bead inlet for each bead receiving conduit section and at least one bead outlet for each bead receiving conduit section. Each one of the plurality of beads is made of thermal conductive material. Each bead receiving conduit section is configured to receive and retain corresponding ones of the plurality of beads therein.

[0018] In an embodiment, each one of the at least one bead inlet is configurable between an open configuration allowing introduction of the corresponding ones of the plurality of beads in the bead receiving conduit section and a closed configuration where the at least one bead inlet closes the bead receiving conduit section and prevents introduction of the corresponding ones of the plurality of beads therein and each one of the at least one bead outlet is configurable between an open configuration allowing removal of the corresponding ones of the plurality of beads from the bead receiving conduit section and a closed configuration where the at least one bead outlet closes the bead receiving conduit section and prevents removal of the corresponding ones of the plurality of beads therefrom.

[0019] In an embodiment, the energy recovery ventilation system is an energy recovery ventilation system of a building.

[0020] In an embodiment, each bead receiving conduit section comprises at least two bead receiving chambers. Each one of the at least two bead receiving chambers is configured to receive and retain a subset of the corresponding ones of the plurality of beads.

[0021] In an embodiment, each one of the at least two bead receiving chambers is operatively connected to one of the at least one bead inlet and one of the at least one bead outlet.

[0022] In an embodiment, each one of the plurality of beads has a substantially spherical shape.

[0023] In an embodiment, each one of the plurality of beads comprises at least one through hole extending therethrough.

[0024] In an embodiment, each one of the plurality of beads has a substantially isogonal polyhedron shape with at least two open faces and a hollow core.

[0025] In an embodiment, each one of the plurality of beads has a substantially O- ring shape.

[0026] In an embodiment, the plurality of beads is divided in at least two bead material subsets, each comprising beads made of a distinct thermal conductive material. The beads of each one of the at least two bead material subsets are received in a distinct bead receiving conduit section. [0027] In an embodiment, the plurality of beads is divided in at least two bead size subsets, each comprising beads having a distinct size. The beads of each one of the at least two bead size subsets are received in a distinct bead receiving conduit section.

[0028] According to another general aspect, there is further provided a method for performing energy recovery in a building. The method comprises the steps of generating an airflow along at least one air transfer path; retaining a plurality of beads in at least one bead receiving conduit section; and transferring thermal energy between the outgoing exhaust air and the incoming supply air through the sequential flow of outgoing exhaust air and the incoming supply air in the at least one bead receiving conduit section where the plurality of beads are retained. The airflow provides outgoing exhaust air being exhausted outside of the building and incoming supply air being supplied inside the building in each one of the at least one air transfer path sequentially. Each one of the at least one bead receiving conduit section is located across one of the at least one air transfer path. Each one of the plurality of beads is made of thermal conductive material.

[0029] In an embodiment, the method of claim further comprises the steps of removing corresponding ones of the plurality of beads from one of the at least one bead receiving conduit section; and reintroducing at least a subset of the corresponding ones of the plurality of beads in the one of the at least one bead receiving conduit section.

[0030] In an embodiment, the method further comprises the steps of cleaning the corresponding ones of the plurality of beads.

[0031] In an embodiment, the step of removing corresponding ones of the plurality of beads from one of the at least one bead receiving conduit section further comprises the step of configuring a bead outlet in an open configuration.

[0032] In an embodiment, the step of reintroducing at least a subset of the corresponding ones of the plurality of beads in the one of the at least one bead receiving conduit section further comprises the step of configuring a bead inlet in an open configuration.

[0033] In an embodiment, the method further comprises the steps of: removing corresponding ones of the plurality of beads from one of the at least one bead receiving conduit section; and reintroducing a plurality of beads in the one of the at least one bead receiving conduit section. The beads being reintroduced are different from the removed corresponding ones of the plurality of beads.

[0034] In an embodiment, the step of removing corresponding ones of the plurality of beads from one of the at least one bead receiving conduit section further comprises the step of configuring a bead outlet in an open configuration.

[0035] In an embodiment, the step of reintroducing at least a subset of the corresponding ones of the plurality of beads in the one of the at least one bead receiving conduit section further comprises the step of configuring a bead inlet in an open configuration.

BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Other objects, advantages and features will become more apparent upon reading the following non-restrictive description of embodiments thereof, given for the purpose of exemplification only, with reference to the accompanying drawings in which:

[0037] Figures 1A and 1 B are schematic representations of an energy recovery ventilation system of a building, according to an embodiment where the ventilation unit includes two reversible fans operating in opposite directions sequentially, and wherein Figure 1A shows a first operating sequence and Figure 1 B shows a second operating sequence.

[0038] Figures 2A and 2B are schematic representations of an energy recovery ventilation system of a building, according to another embodiment where the energy recovery ventilation system includes a supply duct and an exhaust duct, and wherein Figure 2A shows a first operating sequence and Figure 2B shows a second operating sequence.

[0039] Figure 3 is a schematic perspective representation of a portion of an energy recovery ventilation system, in accordance with an embodiment, and wherein bead receiving conduit sections of the energy recovery ventilation system are shown without beads inserted therein.

[0040] Figure 4 is a schematic elevation representation showing one bead receiving conduit section of the energy recovery ventilation of Figure 3, with beads retained therein and showing partial views of an insulation layer and outer covering of a corresponding building.

[0041] Figure 5 is a schematic elevation representation showing a cross-section of the bead receiving conduit sections of the energy recovery ventilation system shown in Figure 3, with beads retained therein.

[0042] Figure 5A is an enlarged view of a subset of the beads retained in one of the bead receiving conduit sections shown in Figure 5.

[0043] Figure 6 is a schematic top plan representation of bead receiving conduit sections of an energy recovery assembly of the energy recovery ventilation system, according to another embodiment.

[0044] Figure 7 is a schematic front elevation representation showing a cross- section of the bead receiving conduit sections of the energy recovery assembly of the energy recovery ventilation system shown in Figure 6.

[0045] Figure 7A is an enlarged view of a subset of the beads retained in one of the bead receiving conduit sections shown in Figure 7.

[0046] Figures 8A to 8C are schematic perspective views of beads which can be used in the present energy recovery ventilation system, wherein Figure 8A shows an embodiment in which a bead has a substantially spherical shape, Figure 8B shows an embodiment in which a bead has a truncated icosahedron shape with open faces and a hollow core, and Figure 8C shows an embodiment in which a bead has a substantially O-ring shape.

DETAILED DESCRIPTION

[0047] In the following description, the same numerical references refer to similar elements. The embodiments, geometrical configurations, materials mentioned and/or dimensions shown in the figures or described in the present description are embodiments only, given solely for exemplification purposes.

[0048] Moreover, although the embodiments of the energy recovery assembly and the energy recovery ventilation system including such energy recovery assembly and corresponding parts thereof consist of certain geometrical configurations as explained and illustrated herein, not all of these components and geometries are essential and thus should not be taken in their restrictive sense. It is to be understood, as also apparent to a person skilled in the art, that other suitable components and cooperation thereinbetween, as well as other suitable geometrical configurations, may be used for the energy recovery assembly and the energy recovery ventilation system including such energy recovery assembly, as will be briefly explained herein and as can be easily inferred herefrom by a person skilled in the art. Moreover, it will be appreciated that positional descriptions such as "above", "below", "left", "right" and the like should, unless otherwise indicated, be taken in the context of the figures and should not be considered limiting.

[0049] Referring generally to Figures 1 A to 2B, there are shown alternative embodiments of energy recovery assemblies 30, 130 operative to transfer thermal energy between outgoing exhaust air 15, 1 15 and incoming supply air 16, 1 16, wherein similar features are numbered using the same reference numerals in the 10 series in Figures 1A and 1 B and in the 100 series in Figures 2A and 2B. In the embodiments shown, the energy recovery assembly 30, 130 is operative to transfer thermal energy between outgoing exhaust air 15, 1 15 and incoming supply air 16, 1 16, in an energy recovery ventilation system 10, 1 10 of a building 20, 120. The energy recovery ventilation system 10, 1 10 includes a ventilation assembly 1 1 , 1 1 1 with a ventilation unit 12, 1 12 operating to generate an airflow and at least one conduit 13, 1 13 which defines at least one air transfer path 14, 1 14 where the outgoing exhaust air 15, 1 15 and the incoming supply air 16, 1 16 flow sequentially, as a result of the airflow generated by the ventilation unit 12, 1 12. As will be easily understood, the outgoing exhaust air 15, 1 15 is exhausted outside of the building 20, 120, from the inside, and incoming supply air 16, 1 16 is supplied inside the building 20, 120, from outside, to counterbalance the exhausted outgoing exhaust air 15, 1 15.

[0050] With reference to Figures 1 A and 1 B, where features are numbered using reference numerals in the 10 series, in the embodiment shown, the ventilation unit 12 includes two reversible fans 21 a and 21 b operating in opposite directions sequentially (i.e. one of the fans 21 a operates continuously in a first direction for a definite time period and in the opposite direction for another definite time period, with the other fan 21 b operating simultaneously in the directions opposite to the operating direction of the first fan 21 a). One skilled in the art will understand that, in an alternative embodiment (not shown), different types and/or quantities of air circulation apparatus can be used for the ventilation unit 12. Figure 1 A shows a first sequence where the first fan 21 a operates in the supply direction, thereby supplying incoming supply air 16 inside the building 20, and the second fan 21 b operates in the exhaust direction, thereby exhausting exhaust air 15 outside of the building 20. Figure 1 B shows a second sequence where the first fan 21 a operates in the exhaust direction and the second fan 21 b operates in the supply direction. The first sequence and the second sequence are continuously performed alternately, each sequence lasting a definite time period, such as, without being limitative, between about 1 minute and about 10 minutes. In an embodiment, the fans 21 a and 21 b are operatively connected to a control assembly (not shown) controlling the operation thereof. [0051] Still referring to Figures 1 A and 1 B, in the embodiment shown, gravity shutters 22a, 22b are provided to open or close the air inlet 23 and air outlet 24 of the conduit 13 associated with the corresponding fan 21 a, 21 b, depending on the direction in which the fan 21 a, 21 b operates. Inwardly opening gravity shutters 22a are provided at the air inlets 23. The inwardly opening gravity shutters 22a open towards the inside and are driven in an open configuration when the fan 21 a, 21 b operates in the exhaust direction (see fan 21 b in Figure 1 A and fan 21 a in Figure 1 B) and are driven in a closed configuration when the fan 21 a, 21 b operates in the supply direction (see fan 21 a in Figure 1 B and fan 21 b in Figure 1 B). In contrast, outwardly opening gravity shutters 22b are provided at the air outlets 24. The outwardly opening gravity shutters 22b open towards the outside and are driven in the closed configuration when the fan 21 a, 21 b operates in the exhaust direction (see fan 21 b in Figure 1 A and fan 21 a in Figure 1 B) and are driven in the open configuration when the fan 21 a, 21 b operates in the supply direction (see fan 21 a in Figure 1 A and fan 21 b in Figure 1 B). In the embodiment shown, filters 25 are also provided at the air inlets 23 and air outlets 24 of the conduits 13 in order to minimize the amount of dust and debris entering the conduits 13. One skilled in the art will easily understand that, in an alternative embodiment, no filters could be provided or alternate means to the above described shutter mechanism could be used to open/close the air inlets 23 and air outlets 24 of the conduits 13. Moreover, in an embodiment (not shown), the same opening in the conduit 13 could be used for both the air inlet 23 and air outlet 24.

[0052] Now referring to Figures 2A and 2B, where features are numbered using reference numerals in the 100 series, there is shown an energy recovery ventilation system 1 10 for a building 120, according to an alternative embodiment where the energy recovery ventilation system 1 10 includes a supply duct 1 17 and an exhaust duct 1 18. The energy recovery ventilation system 1 10 once again includes two reversible fans 121 a and 121 b operating in opposite directions sequentially. Figure 2A shows a first sequence where the first fan 121 a operates in the supply direction to generate incoming supply air 1 16 and the second fan 121 b operates in the exhaust direction to generate outgoing exhaust air 1 15 in the conduits 1 13. Figure 2B shows a second sequence where the first fan 121 a operates in the exhaust direction and the second fan 121 b operates in the supply direction. The first sequence and the second sequence are once again continuously performed alternately, each sequence lasting a definite time period, such as, without being limitative between about 1 minute and about 10 minutes. Once again, in an embodiment, the fans 121 a and 121 b are operatively connected to a control assembly (not shown) controlling the operation thereof.

[0053] In the embodiment of Figure 2A and 2B, the conduits 1 13 are connected to a supply duct 1 17 and an exhaust duct 1 18 of the building 120. Each one of the supply duct 1 17 and the exhaust duct 1 18 includes a plurality of openings used respectively as air inlets 123 in the exhaust duct 1 18 and air outlets 124 in the supply duct 1 17. The supply duct 1 17 and exhaust duct 1 18 include gravity shutters 122a, 122b at opposed ends thereof, proximate to the first fan 121 a and second fan 121 b. The gravity shutters 122a, 122 are opened/closed depending on the direction in which the fan 121 a, 121 b operates and are used to direct the outgoing exhaust air 1 15 in the exhaust duct 1 18 and the incoming supply air 1 16 in the supply duct 1 17. Inwardly opening gravity shutters 122a are provided at opposed ends of the supply duct 1 17. The inwardly opening gravity shutters 122a open towards the inside of the supply duct 1 17 and are driven in an open configuration at the end proximate to the fan 121 a, 121 b operating in the supply direction (see fan 121 a in Figure 2A and fan 121 b in Figure 2B) and in a closed configuration at the end proximate to the fan 121 a, 121 b operating in the exhaust direction (see fan 121 b in Figure 2A and fan 121 a in Figure 2B). In contrast, outwardly opening gravity shutters 122b are provided at opposed ends of the exhaust duct 1 18. The outwardly opening gravity shutters 122b open towards the outside of the exhaust duct 1 18 and are driven in a closed configuration at the end proximate to the fan 121 a, 121 b operating in the supply direction (see fan 121 a in Figure 2A and fan 121 b in Figure 2B) and in an open configuration at the end proximate to the fan 121 a, 121 b operating in the exhaust direction (see fan 121 b in Figure 2A and fan 121 a in Figure 2B). In the embodiment shown, filters 125 are also provided at the opposed ends of each one of the supply duct 1 17 and the exhaust duct 1 18, to minimize the dust and debris reaching the fans 121 a, 121 b. Once again, one skilled in the art will easily understand that, in an alternative embodiment, no filters could be provided.

[0054] For ease of understanding, in the description below, features which could be numbered using reference numerals in the 100 series will now be referred with the corresponding reference number in the 10 series.

[0055] One skilled in the art will understand that the ventilation assembly 1 1 , including the ventilation unit 12 and the conduits 13 (defining the transfer paths 14) of the energy recovery ventilation system 10, is adapted to the required airflow of the associated structure. Therefore, in the case of a building, the number of conduits 13 defining different air transfer paths 14, where the outgoing exhaust air 15 and the incoming supply air 16 flow sequentially, the number of ducts 17, 18, and the type of ventilation unit 12, depends on the required airflow and can vary greatly depending on the size and architecture of the building 20. Hence, the ventilation unit 12 used and the size, shape and/or configuration of the conduits 13 defining different air transfer paths 14 and connected ducts 17, 18 can differ from the embodiment shown, the illustrated embodiments being given herein only for exemplary purposes.

[0056] Moreover, it will be understood that even though in the embodiment shown, the ventilation assembly 1 1 is adapted for a building 20, in alternative embodiments (not shown), the ventilation assembly 1 1 of the energy recovery ventilation system 10 can be adapted to other structures and/or apparatuses, such as high heat apertures having intake/exhaust of air therefrom. For example and without being limitative, in an embodiment (not shown), the ventilation assembly 1 1 of the energy recovery ventilation system 10 can be adapted to industrial ovens or the like. [0057] In view of the above, it will be understood that the incoming supply air 16 and the outgoing exhaust air 15 flow in opposite directions, through each one of the transfer paths 14 sequentially. Therefore, in order to perform the transfer of thermal energy between the outgoing exhaust air 15 and the incoming supply air 16, the energy recovery ventilation system 10 is configured such that each one of the incoming supply air 16 and the outgoing exhaust air 15 flows through an energy recovery assembly 30 thereof, positioned across the corresponding ones of the transfer paths 14.

[0058] In reference to Figures 3 to 5, the energy recovery assembly 30 will now be described in more details below. The energy recovery assembly 30 includes a bead receiving conduit section 32 for each conduit 13 which defines an air transfer path 14 and where the incoming supply air 16 and the outgoing exhaust air 15 flow sequentially. The bead receiving conduit section 32 is a section of the corresponding conduit 13, positioned proximate to the entrance of the conduit 13 for the incoming supply air 16 and the exit of the conduit 13 for the outgoing exhaust air 15. One skilled in the art will understand that, the bead receiving conduit section 32 can have various sizes and shapes which allow a plurality of beads 34 to be inserted and retained therein, as will be described in more details below.

[0059] In the embodiment shown, each bead receiving conduit section 32 has a substantially rectangular parallelepiped shape. One skilled in the art will however understand that, in alternative embodiments, the bead receiving conduit sections 32 can have many different shapes for containing the plurality of beads, which can differ from the substantially rectangular parallelepiped shape of the embodiment shown.

[0060] Moreover, in the embodiment shown, the bead receiving conduit sections 32 extends substantially vertically along a portion of an external wall 19 of the building 20, under the outer covering 19a and the insulation layer 19b thereof (See Figures 4 and 5). The outer covering 19a and the insulation layer 19b provide thermal insulation from the outside environment of the building 20. One skilled in the art will understand that even though the bead receiving conduit sections 32 of the embodiment shown are substantially vertical, in an alternative embodiment (not shown), the bead receiving conduit sections 32 can also be angled from a substantially vertical position or be substantially horizontal.

[0061] One skilled in the art will also understand that, in alternative embodiments, the bead receiving conduit section 32 can also be positioned in a location different than along the portion of an external wall 19 of a building 20 and/or can use different insulating means or methods in order to thermally insulate the beads from the environment. As mentioned above, in an embodiment the ventilation assembly 1 1 of the energy recovery ventilation system 10 can be adapted to a structure and/or apparatus, different than a building and can therefore extend along a section of this structure/apparatus.

[0062] In the embodiment shown in Figure 3, each bead receiving conduit section 32 includes sub-sections configured to receive and retain a subset of the beads 34 of the bead receiving conduit section 32. In the embodiment shown, each bead receiving conduit section 32 includes four bead receiving chambers 33, but one skilled in the art will understand that, in an alternative embodiment (not shown) a different number of bead receiving chambers 33 (or no bead receiving chambers 33) can be provided. Moreover, even though in the illustrated embodiment the bead receiving chambers 33 are positioned in a parallel configuration, in an alternative embodiment (not shown), the bead receiving chambers 33 can be configured in a series configuration, or in a combination of parallel and series configurations. The division of the bead receiving conduit section 32 into multiple bead receiving chambers 33 allows a smaller quantity of beads to be retained in each chamber 33, thereby facilitating the insertion and removal of the beads in each chamber, for example, for maintenance purposes, as will be described in more details below. [0063] In the embodiment shown, each bead receiving conduit section 32 includes an inner (top) bead blocking member 36 and an outer (bottom) bead blocking member 37 configured to retain the beads 34 in the bead receiving conduit section 32. Indeed, in the embodiment shown, the outer bead blocking member 37 prevents the beads from being released at an outer end of the conduit section 32 (e.g. a bottom of the conduit section 32 in the embodiment shown), for example by gravity, and the inner bead blocking member 36 prevents the beads from being released towards the corresponding fan 21 a, 21 b at an inner end of the conduit section 32 (e.g. a top of the conduit section 32 in the embodiment shown), for example, as incoming supply air 16 flows through the conduit section 32. In the embodiment shown, the inner bead blocking member 36 and outer bead blocking member 37 are support grids, but one skilled in the art will understand that, in alternative embodiments (not shown), other components or mechanisms for retaining the beads 34 in the bead receiving conduit section 32 can also be used.

[0064] Referring to Figure 5, in an embodiment, each bead receiving conduit section 32 includes at least one bead inlet 38 which allows selective introduction of the beads 34 in the bead receiving conduit section 32 and at least one bead outlet 39 which allows selective removal of the corresponding ones of the plurality of beads from the bead receiving conduit section 32. Each one of the at least one bead inlet 38 is configurable between an open configuration (shown in figure 5) allowing access to the bead receiving conduit section 32 and introduction of the beads 34 in the bead receiving conduit section 32 and a closed configuration (not shown) where access to the bead receiving conduit section 32 is prevented and introduction of the beads 34 in the bead receiving conduit section 32 is consequently also prevented. Each one of the at least one bead outlet 39 is also configurable between an open configuration (shown in figure 5) allowing access to the bead receiving conduit section 32 and removal of the beads 34 from the bead receiving conduit section 32 and a closed configuration (not shown) where access to the bead receiving conduit section 32 is prevented and removal of the beads 34 from the bead receiving conduit section 32 is consequently also prevented. [0065] In the embodiment shown, the bead inlet 38 and bead outlet 39, each are manual trap doors selectively openable and closeable, for example and without being limitative, from outside the building 20, and which can be locked in the closed configuration when the beads are retained inside the bead receiving conduit section 32. One skilled in the art will understand that several locking mechanisms known in the art can be used to lock the manual trap doors in the closed configuration. One skilled in the art will also understand that, in an alternative embodiment, the bead inlet 38 and bead outlet 39 can be positioned differently than in the embodiment shown. For example and without being limitative, in an embodiment (not shown) the bead inlet 38 and/or bead outlet 39 can be located in the corresponding one of the top bead blocking member 36 and bottom bead blocking member 37. Moreover, one skilled in the art will also understand that, in alternative embodiments, other components or mechanisms which allow selective introduction/removal of the beads in/from the bead receiving conduit section 32, distinct from the above described manual trap doors, can also be used.

[0066] In embodiments where the bead receiving conduit section 32 is divided in multiple bead receiving chambers 33, one bead inlet 38 and one bead outlet 39 can be provided for each bead receiving chamber 33.

[0067] Advantageously, each bead outlet 39 and corresponding bead inlet 38 allows easy selective access to the corresponding bead receiving conduit section 32 or bead receiving chambers 33 and therefore allows easy removal and reintroduction of the beads 34 into the corresponding bead receiving conduit section 32 or bead receiving chambers 33 of the bead receiving conduit section 32, for example and without being limitative, for cleaning purposes, bead replacement purposes or the like.

[0068] In an embodiment, the cleaning process of the beads 34 contained in one of the bead receiving conduit section 32 or bead receiving chambers 33 of the bead receiving conduit section 32 can be performed manually, by configuring the bead outlet 39 in the open configuration, removing the beads 34 from the corresponding bead receiving conduit section 32 or bead receiving chambers 33, through the bead outlet 39, and cleaning the beads. Subsequently the beads 34 can be reinserted in the corresponding bead receiving conduit section 32 or bead receiving chambers 33, by configuring the corresponding bead inlet 38 in the open configuration (with the corresponding bead outlet being previously reconfigured in the closed configuration).

[0069] In an embodiment, the cleaning process can also be automated, for example and without being limitative, through the use of an automated washing device (not shown). In an embodiment, the automated washing device can be configured to automatically configure the bead outlet 39 in the open configuration, remove the beads 34 from the corresponding bead receiving conduit section 32 or bead receiving chambers 33, though the bead outlet 39, clean the beads and subsequently reintroduce the beads 34 in the corresponding bead receiving conduit section 32 or bead receiving chambers 33, through the corresponding bead inlet 38, by configuring the corresponding bead inlet 38 in the open configuration (with the corresponding bead outlet being previously reconfigured in the closed configuration). It will be understood that, in an embodiment, the automated washing device can operate automatically to proceed with the cleaning of the beads 34 of the different bead receiving conduit section 32 or bead receiving chambers 33 sequentially, when required or at predetermined intervals.

[0070] One skilled in the art will understand that a process similar to the cleaning process, can also be used for replacement of a portion of the beads from the corresponding bead receiving conduit section 32 or bead receiving chambers 33 or all of the beads therefrom. In other words, the bead outlet 39 can be configured in the open configuration to remove the beads from the corresponding bead receiving conduit section 32 or bead receiving chambers 33, though the bead outlet 39, and the corresponding bead inlet 38 can be configured in the open configuration (with the corresponding bead outlet being previously reconfigured in the closed configuration), to introduce new beads, with or without previously removed beads, in the corresponding bead receiving conduit section 32 or bead receiving chambers 33 through the corresponding bead inlet 38

[0071] Referring now to Figures 6 and 7, it is shown a non-limitative alternative configuration for the conduit section 232 in an energy recovery ventilation system 210 for a building 220, wherein similar features are numbered using the same reference numerals in the 200 series. In the alternative embodiment shown in Figures 6 and 7, each bead receiving conduit section 232 has a substantially cylindrical shape. In the embodiment shown, the bead receiving conduit section 232 is located in an external structure having an outer covering 219a and an insulation layer 219b thereof, such that the bead receiving conduit section 232 is thermally insulated from the outside environment of the building 220. In the embodiment shown, each bead receiving conduit section 232 includes three bead receiving chambers 233 configured to receive and retain a subset of the beads 234 of the bead receiving conduit section 232. Once again, the division of the bead receiving conduit section 232 into multiple bead receiving chambers 233 allows a smaller quantity of beads to be retained in each chamber 233, but it will be understood that, in alternative embodiments, another amount of bead receiving chambers 233 or no bead receiving chamber 233 could be provided. Once again, one skilled in the art will understand that even though the bead receiving conduit sections 232 of the illustrated embodiment are substantially vertical, in an alternative embodiment, the bead receiving conduit sections 232 could be angled from a substantially vertical position.

[0072] Once again, for ease of understanding, in the description below features which could be numbered using reference numerals in the 200 series will now be referred with only the reference number in the 10 series.

[0073] Hence, one skilled in the art will understand that, in other possible alternative embodiments, the bead receiving conduit sections 32 can also have sizes, shapes, configurations and/or positioning which differ from the illustrated embodiments. The size, shape, configuration and/or positioning of the bead receiving conduit sections 32 is adapted according to the structures and/or apparatuses for which the energy recovery ventilation system 10 is installed. For example, in the case of an energy recovery ventilation system 10 for a building such as the embodiments shown, the size, shape, configuration and/or positioning of the bead receiving conduit sections 32 is adapted to the architecture of the building 20 and the required airflow of the corresponding conduits 13 thereof. In alternative embodiments, an energy recovery ventilation system 10 can include multiple bead receiving conduit sections 32, each having sizes shapes and/or positioning which differ from one another in order to adapt to the required airflow of the corresponding conduits 13 of the structure or apparatus for which the energy recovery ventilation system 10 is installed. Moreover, it will be understood that even though the embodiment shown shows the bead receiving conduit sections 32 being connected to the remainder of the ventilation assembly 1 1 , by a top section of the bead receiving conduit sections 32, in an embodiment the bead receiving conduit sections 32 can be connected to the remainder of the ventilation assembly 1 1 by a bottom section or a side section thereof.

[0074] Now referring to Figures 5A, 7A and 8A to 8C, as mentioned above, a plurality of beads 34 are retained in each bead receiving conduit section 32. Each one of the beads 34 is made of thermal conductive material, such as, without being limitative, aluminum, glass, granite, river rock, copper, iron, stainless steel, brass, bronze, or the like. The beads 34 are sized and shaped to allow the incoming supply air 16 and the outgoing exhaust air 15 to flow through the bead receiving conduit section 32, while performing thermal transfer with the beads 34. In an embodiment, each bead 34 has a substantially spherical shape (see Figures 5A, 7A and 8A) and has a diameter ranging between about ¼ inch and 6 inches. One skilled in the art will however understand that, in an alternative embodiment, the beads 34 can have a shape distinct from the illustrated substantially spherical shape of Figures 5A, 7A and 8A. In an embodiment, the beads 34 can include one or more through hole extending therethrough, thereby allowing airflow through the beads 34. For example and without being limitative, in an embodiment, the beads 34 can have a polyhedron shape, with at least two open faces and a hollow core between the open faces to allow the passage of the air through the beads 34. Figure 8B shows such an embodiment where the bead has a truncated icosahedron shape with open faces and a hollow core between the faces, such that the bead 34 is essentially composed of the edges of the truncated icosahedron. One skilled in the art will however understand that, in alternative embodiments (not shown), the bead 34 can also have a different polyhedron shape. In another alternative embodiment the beads 34 can have a substantially O-ring shape (see Figure 8C). In view of the above, one skilled in the will understand that the beads 34 can have multiple shapes which allow the incoming supply air 16 and the outgoing exhaust air 15 to flow through the bead receiving conduit section 32, while performing thermal transfer with the beads 34 and should not be restricted to a specific bead shape.

[0075] In an embodiment, the material of the beads 34 may be selected to perform humidity exchange between the outgoing exhaust air 15 and incoming supply air 16 or simply to resist to high humidity and/or acidity of the outgoing exhaust air 15.

[0076] One skilled in the art will understand that, in an embodiment where multiple conduits 13 are provided, each defining a different air transfer path 14 (thereby resulting in multiple bead receiving conduit sections 32 where beads 34 are retained) the size and/or shape and/or material of the beads 34 of each one of the multiple bead receiving conduit sections 32 can be different, for example to be adapted to one of the temperature, humidity level, or acidity level of the outgoing exhaust air 15 and incoming supply air 16 of the particular bead receiving conduit sections 32 in which they are introduced and retained. It will also be understood that the size and/or shape and/or material of the beads 34 of each bead receiving chamber 33 within a bead receiving conduit section 32 can also be different to be adapted to the specific air characteristics of the outgoing exhaust air 15 and incoming supply air 16 for the specific position of each bead receiving chamber 33. [0077] Advantageously, when used in a ventilation for a building, the above described energy recovery assembly and energy recovery ventilation system comprising the energy recovery assembly can allow heating of the outside air before it is supplied inside the building, using the thermal energy of the exhausted inside air transferred to the beads retained in each bead receiving conduit section 32. In cases where the internal temperature of the building is colder than the external temperature, such energy recovery assembly and energy recovery ventilation system can also perform free cooling, i.e. cooling of the outside air before it is supplied inside the building, using the low temperature of the exhausted inside air transferred to the beads retained in each bead receiving conduit section 32. Moreover, the energy recovery assembly and energy recovery ventilation system comprising the energy recovery assembly allows maintenance (i.e. cleaning or recycling of the beads 34) to be performed on a portion of each conduit section 32 at the time (i.e. each bead receiving chamber 33 at the time), therefore leading to no down time of the system.

[0078] The energy recovery assembly and energy recovery ventilation system comprising the energy recovery assembly having been described above, a method of operation for the energy recovery ventilation system will now be described. In an embodiment the method comprises generating the airflow along the at least one air transfer path where outgoing exhaust air is exhausted and incoming supply air is supplied in each transfer path sequentially. The method further comprises retaining a plurality of beads in at least one bead receiving conduit section and transferring thermal energy between the outgoing exhaust air and the incoming supply air through the sequential flow of outgoing exhaust air and the incoming supply air in the at least one bead receiving conduit section where the plurality of beads are retained. In the above mentioned method, each bead receiving conduit section is located across one of the at least one air transfer path and each bead is made of thermal conductive material. [0079] In an embodiment, the method also comprises steps related to the cleaning or replacement of the beads. Such steps include the steps of configuring the bead outlet in the open configuration, removing corresponding ones of the plurality of beads from one of the at least one bead receiving conduit section, cleaning the corresponding ones of the plurality of beads (the case of cleaning purposes), configuring the bead outlet in the closed configuration, configuring the bead inlet in the open configuration and reintroducing the beads in the bead receiving conduit section. As mentioned above, the reintroduced beads can be the beads previously removed, a subset thereof, or completely new beads (in the case of a replacement for example).

[0080] Several alternative embodiments and examples have been described and illustrated herein. The embodiments of the invention described above are intended to be exemplary only. A person skilled in the art would appreciate the features of the individual embodiments, and the possible combinations and variations of the components. A person skilled in the art would further appreciate that any of the embodiments could be provided in any combination with the other embodiments disclosed herein. It is understood that the invention may be embodied in other specific forms without departing from the central characteristics thereof. The present examples and embodiments, therefore, are to be considered in all respects as illustrative and not restrictive, and the invention is not to be limited to the details given herein. Accordingly, while specific embodiments have been illustrated and described, numerous modifications come to mind without significantly departing from the scope of the invention as defined in the appended claims.