The invention relates to control of an indoor climate of an inner space, said inner space being partly delimited by a floor, wherein an underfloor space, for example a crawl space, is present under the floor.

The invention aims to provide climate control and associated means that produce one or more improvements relative to known underfloor insulation solutions.

For example, an objective is to provide a climate control that achieves one or more of the following aims: improved energy efficiency, usability for several climate control purposes, easy to install, low cost of manufacture, easy to store and transport, easy to install, no substantial limitation to later access to the crawl space.

The invention provides a method according to claim 1 for controlling an indoor climate of an inner space. Herein the inner space is partly delimited by a floor, wherein an underfloor space, for example a crawl space or an (unheated) cellar, is present under the floor.

The method employs a flow-through insulation assembly that is arranged under the floor of the inner space and in the underfloor space. For example, the assembly is placed with the bottom wall thereof on the ground in the crawl space.

The insulation assembly has a gas-tight chamber with a top wall, a bottom wall, and a perimeter, for example with a peripheral wall. The top wall is located at a distance under or against the floor of the inner space. In practical embodiment, several insulation assemblies are arranged under a floor, for example side by side, or, for example, between floor joists, so that the underside of the floor is almost completely covered with insulation assemblies.

In an insulation assembly, the top wall and the bottom wall, and the optional peripheral wall, are each essentially formed by an air-tight film material, for example of suitable plastic film.

Furthermore, a perforated top film and a perforated bottom film are arranged in the gas-tight chamber. The top wall, the bottom wall, the perforated top film, and the perforated bottom film have air tight joints with the perimeter of the gas-tight chamber, so that a top cavity of the insulation assembly is delimited between the perforated top film and the top wall, a bottom cavity of the insulation assembly is delimited between the perforated bottom film and the bottom wall, and a flow-through space for gas is delimited between the perforated top film and the perforated bottom film.

The insulation assembly has a top opening that is connected to the top cavity, and a bottom opening that is connected to the bottom cavity.

The method employs a ventilation system with at least one fan.

For controlling the indoor climate of the inner space, said ventilation system with the one or more fans is operated in order to supply a gas, for example air, to the gas-tight chamber of the insulation assembly.

Supply of the gas, for example air, takes place via either the bottom opening or the top opening. The gas supplied leaves the gas-tight chamber via the other one of the bottom opening and the top opening. Depending on to which of the bottom opening and the top opening the gas is supplied, the gas flows either from bottom to top or from top to bottom through the insulation assembly.

If the gas is supplied by the ventilation system via the bottom opening the gas comes into the associated bottom cavity and then passes through the perforated bottom film associated with the cavity. The gas then comes into the space for gas flow-through between the bottom film and the top film, and flows upwards through said space, and then leaves said space through the perforated top film. The gas then flows into the top cavity and leaves said top cavity and the gas-tight chamber via the top opening.

In one embodiment the ventilation system is only able to create this flow from bottom to top.

It is also conceivable for the ventilation system to be configured and to be operated to produce a gas flow from top to bottom. In this case the gas is supplied by the ventilation system via the top opening and the gas comes into the associated top cavity. Then the gas passes through the perforated top film associated with said cavity. The gas then comes into the space for gas flow-through between the bottom film and the top film, and flows down through said space, and then leaves said space through the perforated bottom film. The gas then flows into the bottom cavity and leaves said bottom cavity and the gas-tight chamber via the bottom opening. It is also conceivable, even advantageous, if the ventilation system is configured and operated so that it is possible to select flow from bottom to top or flow from top to bottom through the insulation assembly.

Based on examples, further explanation will be given of which direction of flow is favourable for which purpose of control of the indoor climate.

The perforated top film and perforated bottom film have small flow-through openings or perforations, which preferably are present over the greater part of the area of the top film and the bottom film.

For example, the top film and the bottom film are perforated over almost their whole area, for example uniformly over the whole area.

For example, the perforated top film and/or the perforated bottom film are provided with a heat- radiation reflecting layer, for example a metal layer, for example provided with a metal film, for example plasticized aluminium. This blocks heat radiation.

For example, the perforations each have a diameter between 0.04 mm and 1 mm, preferably between 0.1 and 0.5 mm. The perforations may be present uniformly over the whole surface, or in groups.

For example, at least 10 000 perforations per m ² are present in the perforated bottom film and/or in the perforated top film.

For example, the perforated top film and/or the perforated bottom film are made of a vapour- permeable film, which has perforations that allow water vapour to pass through. For example, with perforations with a diameter between 0.04 mm and 0.2 mm, for example between 0.05 and 0.1 mm. Vapour-permeable film of this kind is used on a large scale in the building industry for other purposes. For example, the vapour-permeable film has an aluminium layer or the film is metallized, for example with aluminium.

For example, the perforations are so small that a water column of 5 centimetres does not penetrate through the perforations. For example, a vapour-permeable aluminium film is used for the perforated top film and/or the perforated bottom film, for example, with perforations of 0.2 mm diameter and with 20 perforations per cm ² .

The gas flow undergoes a pressure drop during each passage through the perforated films. For a good distribution of flow over the horizontal cross-section of the flow-through space, it is preferable for the pressure drop over the perforated films and the space in-between to be at least 15 times greater than the pressure drop over each of the cavities. This pressure drop may be achieved through suitable choice of the pores in the perforated films and/or the size of the cavities.

The method makes it possible to allow the gas that flows through the space between the perforated bottom film and top film, thus from bottom to top or vice versa, to flow more quickly than the diffusion rate of the gas. Depending on the situation, heat or cold, which then flows parallel to the gas, cannot then flow against the gas flow and is therefore blocked, and is preferably recovered. If the gas flow goes from warm to cold, a warm front develops, which blocks cold. If the gas flow goes from cold to warm, a cold front develops, which blocks heat.

In the case of a cold front, the through-flowing gas is warmed up, which costs heat energy, which is partly recovered from the diffuse heat flow, and in the case of a warm front this heat may be lost to the exterior. In order to limit this, it is preferable to keep the amount of gas flowing through the insulation assembly as small as possible, and/or utilize a ventilation flow already associated with the inner space for the gas flow, and/or use the ventilation or air circulation of a heat pump for the gas flow. It is also conceivable to recover the heat with a heat pump.

The flow of the gas through the space between the top film and the bottom film is, preferably, laminar. In practical terms, this is possible by having small flow-through openings, for example pores or perforations, in the perforated top film and the bottom film in combination with the large area of these films. As a result, the flow-through velocity of the gas can be very low and the gas flow in said space between the perforated films can be laminar. This prevents problematic thermal and/or convective turbulence in said space, and therefore also disturbance of the blocking action as described. This favourable action can be achieved in an especially practical manner if thermal stratification occurs in the space between the perforated films through which the gas flows, for example if in said space through which the gas flows, the top is warmer and the bottom is colder. This is often the case with a (crawl) space under the floor of an inner space. Thermal velocity is a diffuse quantity, which depends on the average path length and the velocity of the molecules in a medium, in this case a gas. It can be determined from the Peclet number Pe, which is greater than 1 if the convective flow is greater than the diffuse flow. In the form of a formula: Pe = v I p Cp/l, where v = gas velocity perpendicular to the surface of the flow-through space between the perforated films, I = path length through the flow-through space and thus the distance/height between the perforated bottom film and the perforated top film, p = the density of the through-flowing gas, Cp = the heat capacity of the through-flowing gas and A = the thermal conductivity of the through-flowing gas.

If the Pe number of the through-flowing gas increases, the flow of the conduction heat is blocked more and the effective conductivity decreases, and the insulation of the insulation assembly is better.

Preferably, the insulation assembly and the ventilation system are arranged so that a Peclet number Pe greater than 0, preferably greater than 1 , more preferably greater than 3, is achieved in the gas flow through the space between the perforated top film and the perforated bottom film, wherein the Pe number is determined from the velocity component v of the through-flowing gas, which is parallel to the heat flow, the thickness/height of the flow-through space between the perforated top film and bottom film, the specific heat Cp, the specific gravity p _g , the thermal conductivity A _g of the through-flowing gas:

Pe = v I Cp pg/Ag.

Depending on the height of the flow-through space, the flow-through velocity for air, for example, may be between 0.05-4 mm/s and thus be 0.05-4 litres/s per m ² horizontal cross- sectional area of the flow-through space of the assembly.

In one embodiment, air from outside is pumped by a fan, for example via a pipe or hose, into the bottom cavity of the insulation assembly. This air warms up through recuperation in the flow-through space and, warmed up, flows via the top cavity to the inner space, for example as warmed fresh ventilating air. If the used ventilating air is led away from said inner space, the heat present in said used ventilating air can be recovered with a heat pump, so that hardly any heat is lost at the expense of electricity consumption of the heat pump and the fan. This electricity consumption is only a small fraction of what is used without heating, and there is thus an enormous saving on energy costs. For example, at an Rc value of 20 Km ² /W of the insulation assembly, a ground temperature of 10°C and a floor temperature of 20°C, with a floor area of, for example, 60 m ² , only 30 W is lost. With ventilation of 40 m ³ /hour, at an outdoor temperature of 0°C the air must be warmed up with 267 W and with the loss from the floor it is approx. 297 W and with a COP of 5, an electric power of only 59 W is necessary for recovering the heat from the floor and the ventilation.

In another embodiment, in addition a circulation passage is present, connecting the bottom opening to the top opening. This circulation passage forms a closed gas circuit with the bottom cavity, the space for gas flow-through, and the top cavity. In this case the ventilation system comprises a fan for the circulation passage, which circulates gas present in the closed gas circuit and causes movement of the gas through the space for gas flow-through, from bottom to top or from top to bottom or in one of the two directions as selected. In a closed gas circuit, air may be circulated, but it may also be a gas other than air, for example carbon dioxide gas.

In an embodiment wherein the circulation of the through-flowing gas is a closed circulation, the gas is displaced, for example drawn, by means of a fan through an evaporator part of a heat pump and, cooled by the evaporator part, is conveyed either to the bottom cavity or the top cavity, depending on the desired effect on the indoor climate.

In a possible embodiment, the cooled gas from the evaporator part is conveyed to the bottom cavity. From there, the gas flows, possibly warmed through contact of the bottom cavity with the ground, to the flow-through space, in which it is warmed further by recuperation with the conduction heat, during flow from bottom to top. On arriving in the top cavity, the gas is conveyed back to the evaporator part of the heat pump, where the heat absorbed is withdrawn again and after which the circulation ends, and begins again. This heat pump brings the absorbed heat to a condenser part of the heat pump, where this heat can be supplied at a higher temperature, for example to a heating system, such as floor heating, hot-air heating, boiler, or some other heating or heat storage. Thus, the heat pump supplies net heat energy from the ground under the inner space and the conduction heat that would be lost through the floor is recovered completely. If the ventilation of the inner space is provided, for example, by a balanced ventilator at a balance efficiency of 70%, at 40 m ³ /hour only 80 W is needed, and at a heat pump power of 297 W, there is still 217 W for heating the rest of the inner space, which is ample when good wall and window insulation is used and there is internal heat production from inter alia humans and equipment. Also, only 59 W of electric power is needed for a small, inexpensive heat pump, and the flow-through insulation assembly also requires little capital expenditure.

During the heating season, the temperature of the ground decreases, on account of the large heat content and the small absorption, at just 1 K and in the summer this can be amply increased back to the original level. If it is desired to heat the inner space with the heat pump, then a possible embodiment envisages conveying the cooled gas from the evaporator part to the bottom cavity. From there, the gas flows, possibly warmed through contact of the bottom cavity with the ground, to the flow-through space, in which it warms further through recuperation with the conduction heat during flow from bottom to top. On arriving in the top cavity, the gas is conveyed back to the evaporator part of the heat pump, where the absorbed heat is withdrawn again and after which the circulation ends, and begins again. This heat pump brings the absorbed heat to a condenser part of the heat pump, where this heat can be supplied at a higher temperature, for example to a heating system. In practice, this solution only requires a very small heat pump, orders of magnitude smaller than currently provided for heat pumps that are provided for heating inner spaces. In particular, the invention provides the possibility of utilizing the circulating fan of the heat pump as part of the ventilation system and creating the gas flow through the insulation assembly with this, giving better insulation of the insulation assembly. Integration with a heat pump according to the invention also makes it possible in some cases to dispense with the known external unit of a heat pump that obtains heat from the outside air.

If it is desired to cool the inner space in the system with a heat pump and a closed gas circuit, then the direction of the through-flowing gas is reversed and the floor of the inner space is cooled and the ground under the inner space is warmed up if the bottom cavity is in contact with it. The heat that is released thereby in the condenser part of the heat pump may then be used for things such as hot water, for example, stored in a boiler, heat storage, or other useful applications.

The films of the insulation assembly have air-tight joints with the perimeter, such as for an air mattress. For example, the bottom wall film, the perforated bottom film, the perforated top film, and the top wall film, have direct, air-tight joints with one another. An air-tight joint is obtained, for example, with glue or by welding.

In a possible embodiment, the perimeter of the gas-tight chamber is formed by a peripheral wall, wherein the top wall, bottom wall and the perforated films have an air-tight joint on their perimeter. Preferably, said peripheral wall is foldable, so that the insulation assembly can be folded together and optionally rolled up and/or folded up into a film packet. Preferably, said peripheral wall is made of film, for example, the same film as the top wall and the bottom wall. For example, the peripheral wall has a height that matches the intended maximum distance between the perforated top film and the perforated bottom film.

In a further embodiment the insulation assembly has a further film under the bottom wall, which has an air-tight joint to the perimeter and together with the bottom wall delimits a third cavity that is located under the bottom cavity. In operation, a medium other than the gas supplied by the ventilation system can flow through the third cavity, and said medium then exchanges heat with the gas flowing through the bottom cavity. This other medium may, for example, be groundwater, which can provide extra heat if the inner space is to be heated, and extra cooling if cooling of the inner space is required. Because a heat pump can extract more heat from the groundwater, the circulation can be increased and the conduction heat loss through the flow through insulation assembly falls almost to zero, whereas the heat pump can then provide the heating and cooling of the whole building including the inner space above the crawl space.

Within, in front of, or behind the top opening and/or the bottom opening, equipment may be placed, with which the through-flowing gas is subjected to a pre-treatment or a post-treatment, for example, selected from the list of one or more filters, one or more gas absorbers, one or more humidifiers, one or more dehumidifiers, etc. This makes it possible, for example, for the through-flowing gas to be utilized, preventing contamination or obstruction of the flow-through space and the cavities.

In a possible embodiment of the method, the top cavity is warmer than the bottom cavity, so that thermal stratification occurs, in particular in the space through which the gas flows between the perforated top film and perforated bottom film. This is favourable because this stratification counteracts the development of undesirable turbulence, which may have an adverse influence on the blocking effect.

The invention further relates to a climate control system according to claim 13 for controlling an indoor climate of an inner space, for example, according to the method as described herein, said inner space being partly delimited by a floor, wherein an underfloor space, for example a crawl space, is present under the floor.

In a possible embodiment, for example in the situation in which the top cavity is warmer than the bottom cavity, but optionally also in other situations, the space between the perforated top film and perforated bottom film is empty. There may optionally be wires or the like in this space, which define a maximum distance between the perforated films. These wires or the like may also be provided in one or both cavities of the ventilation assembly.

Owing to the presence of thermal stratification in the space through which the gas flows between the perforated top film and perforated bottom film, it may be possible to dispense with the presence of a porous insulating material as is described in WO2019017784 and as is provided there in order to prevent thermal turbulence and flow turbulence. Therefore, in the context of the present invention, this space may be empty, which is preferred. ln a possible embodiment, the insulation assembly is configured as a film packet that can be rolled up and/or folded up, with a packet of films stacked on one another. In one embodiment, the film packet may be unrolled under the floor and be inflated by the ventilation system, for example wherein the insulation assembly then unfolds like an air mattress. Optionally, the film packet has tubular spaces that are inflatable in order to serve as stiffening ribs, such as is known for inflatable tents.

A configuration of a film packet that can be rolled up and/or folded up makes it possible, for example, after expansion of the ventilation system, to allow the film packet to fold up again, for example, under the effect of gravity. The folded insulation assembly may then optionally be rolled up and/or folded up again, and be installed again later.

For example, it is envisaged that the insulation assembly is configured as a film packet, wherein, for carrying out activities under the floor, the ventilation system is stopped so that the film packet collapses and access is provided under the floor for carrying out said activities. Preferably, it is possible to walk on the insulation assembly in said folded state. Optionally, the folded packet is rolled up and/or folded up.

The invention also relates to a building provided with an inner space that is partly delimited by a floor, wherein an underfloor space, for example a crawl space, is present under the floor, said building being provided with a climate control system according to the invention.

The invention also relates to a method according to claim 20 for installing a climate control system, wherein the insulation assembly in the folded state, optionally rolled up and/or folded up, is brought into the space under the floor, for example into the crawl space, wherein the insulation assembly is inflated in said space by means of a fan, optionally is unrolled or unfolded first, and optionally is laid on the floor of the space.

The invention will be explained hereunder on the basis of the figures. These show:

Fig. 1 shows a schematic cross-section of a flow-through insulation assembly according to the present invention;

Fig. 2 shows a schematic cross-section of a second application of a flow-through insulation assembly according to the present invention;

Fig. 3 shows a schematic cross-section of a third application of a flow-through insulation assembly according to the present invention; Fig. 4 shows a schematic cross-section of a detail of an embodiment of a flow-through insulation assembly according to the present invention.

Fig. 1 shows schematically a building 30 with side walls 31 , 32, and roof 33, and an inner space 8 in the building 30. The inner space 8 is partly delimited by a floor 7.

Under the floor 7 there is an underfloor space 34, here a crawl space with a bottom, and under this the ground 14.

In the space 34 there is an embodiment of a flow-through insulation assembly 1 according to the invention. The insulation assembly 1 has a gas-tight chamber with a top wall 3, a bottom wall 2, and a perimeter 23, here with a peripheral wall 36. The top wall 3, the bottom wall 2, and the peripheral wall 36 are each essentially formed by a gas-tight film. Furthermore, a perforated top film 11 a and a perforated bottom film 1 1 b are arranged in the gas-tight chamber.

The top wall 3, the bottom wall 2, the top film 1 1a, and the bottom film 1 1 b have an air-tight joint to the perimeter, here with peripheral wall 36, of the gas-tight chamber, so that a top cavity 6 of the insulation assembly is delimited between the perforated top film 11 a and the top wall 3, a bottom cavity 5 of the insulation assembly is delimited between the perforated bottom film 1 1 b and the bottom wall 2, and a flow-through space for gas 4 is delimited between the perforated top film 11 a and the perforated bottom film 11 b, and is surrounded by the peripheral wall 36.

It is preferred that the space 4 is empty, and thus free from a filling with porous material. The same applies to the cavities 5, 6.

The insulation assembly 1 has a top opening 10, which is connected to the top cavity 6, and a bottom opening 9, which is connected to the bottom cavity 5.

In this example, the bottom opening 9 communicates with the outside air, for example via a pipe and/or hose. Here, the top opening 10 communicates with the inner space, optionally with a ventilation system for the inner space 8.

To create a flow of gas, here air, through the insulation assembly, a fan 13 is provided. In this example the fan 13 is connected to the bottom opening 9.

Here, the insulation assembly 1 is configured as a film packet that can be rolled up and/or folded up with a packet of films stacked on one another, here the top wall 3, the bottom wall 2, the perforated top film 11 a and the perforated bottom film 1 1 b, wherein, preferably, the flow through space between the perforated films 1 1a, b and surrounded by the peripheral wall 36, is empty.

The insulation assembly 1 is, for example, brought in the folded state, optionally rolled up and/or folded up, into the space under the floor, for example into the crawl space.

Once in said space, the insulation assembly 1 is inflated by means of a fan, optionally after first being unrolled or unfolded. Here, the insulation assembly is placed on the bottom of the space. The fan 13 may optionally already be used during installation of the assembly.

After inflation, the top wall 3 is now under or against the floor 7 of the inner space 8, and the bottom wall 2 lies on the bottom of the space 34 and thus on the ground 14. The crawl space is thus filled completely or partially.

The flow of the through-flowing gas is indicated here with a streamline 12 as a dotted line, which is indicated here in the heating state of the climate control, and which is the other way round in the cooling state. The gas flow may be either upwards or downwards, depending on the desired climate in the inner space 8.

In this example outside air is drawn in with the fan 13 and is pumped into the bottom cavity 5 via said opening 9. The air then passes through the perforated bottom film 1 1 b belonging to said cavity 5. The gas then comes into the space for gas flow-through 4 between the bottom film 1 1 b and the top film 11a, and flows upwards through said space 4, and then leaves said space 4 through the perforated top film 11a. The gas then flows into the top cavity 6 and leaves said top cavity and the gas-tight chamber via the top opening 10 and in this case comes into the inner space 8. In a possible embodiment the ventilation system is only able to create this flow from bottom to top. As mentioned, the ventilation system may also be arranged so that the flow through the insulation assembly is from bottom to top, or from top to bottom, as selected, depending on the intended climate control. In all cases the gas flows in the flow through space 4 almost parallel to the heat flow, which can ensure blocking of the heat or cold.

As has been described, as the Pe number of the through-flowing gas increases, the flow of conduction heat is blocked more, the effective conductivity is lower and the insulation of the flow-through insulation assembly 1 is better.

Within, in front of or behind the openings 9 and 10, equipment may be placed for pre-treatment or post-treatment of the through-flowing gas, such as pumps, fans, filters, gas absorbers, humidifiers, dehumidifiers, etc., so that the through-flowing gas may be utilized and there is no contamination or obstruction of the flow-through insulation packet 1 and the cavities 5 and 6.

In Fig. 2, components that are the same as in Fig. 1 are given the same reference numbers. Fig. 2 again shows the building 30 with the insulation assembly 1 in the crawl space 34 under the floor 7.

In contrast to the "open circulation" in Fig. 1 , here it is an embodiment with a closed gas circuit.

In this embodiment, a circulation passage 40 is present, which is connected to the bottom opening 9 and to the top opening 10. Said passage 40 forms, with the bottom cavity 5, the space for gas flow-through 4, and with the top cavity 6, a closed gas circuit. In general terms, the ventilation system has a fan 13 for the circulation passage 40, which circulates gas present in the closed gas circuit, and thus into and out of the assembly 1 , and creates movement of the gas through the space for gas flow-through 4, from bottom to top or from top to bottom.

A heat pump 15 with an evaporator part and a condenser part may also be seen in this example. This shows schematically that the gas circulating in the closed gas circuit flows through an evaporator part of the heat pump 15 and exchanges heat with it.

It is shown here that the heat pump 15 has a fan 13, which causes the gas to flow through the evaporator part, and which forms part of the fan assembly.

The flow of the through-flowing gas is indicated with a streamline 12 as a dotted line, which is indicated here in the heating state, and which is the other way round in the cooling state. The flow through the assembly 1 may be directed either upwards or downwards, depending on the desired climate in the inner space 8.

The flow-through insulation assembly 1 is connected to the evaporator part of a heat pump 15 and exchanges heat with it. If the inner space 8 has to be heated, the fan 13 forces the cooled gas to flow from the evaporator to the bottom cavity 5, and it absorbs heat from the ground 14 under the crawl space 34. Then the gas goes through the flow-through insulation assembly 1 to the top cavity 6 and is warmed up further by recuperation of the conduction heat that will flow down through the assembly 1. Then the gas flows via the top cavity 6 back to the evaporator of the heat pump 15, where it is cooled further, so that it is colder than the temperature of the ground 14, and after which the closed cycle is repeated again. In the bottom cavity 5, it is thus colder than the ground 14, and heat can only flow from the ground 14 to the bottom cavity 5, and the flow of the conduction heat from the floor 7 to the ground 14 is blocked completely. Thus, the air circulation of the air heat pump 15 is utilized for considerable improvement of the insulation of the insulation packet 1 of the inner space 8. Moreover, the heat pump 15 does not in this case need an outside unit with filter and fan, and gets the extra heat from the ground 14.

The heat absorbed by the heat pump 15 is transferred by means of the condenser thereof according to the indicated streamlines 16 to a heating system that is not shown, for example such as floor heating, hot-air heating, or to a boiler or other heat storage.

If the inner space 8 has to be cooled, the fan 13 forces the cooled through-flowing gas from the evaporator part to the top cavity 6 and the gas absorbs heat from the floor 7, said floor 7 and thus also space 8 being cooled thereby. Then the gas goes through the flow-through insulation assembly 1 to the bottom cavity 6 and the gas is warmed up further by the conduction heat that will flow downwards through the assembly 1. Then it flows to the bottom cavity 5, where the gas gives up its heat to the ground 14, and the gas then flows to the evaporator of the heat pump 15, where it is cooled further, and after which the closed cycle is repeated again.

The heat absorbed by the heat pump 15 is transferred by means of the condenser thereof according to the indicated streamlines 16 to a system that is not shown, for example such as a boiler or other heat storage.

In Fig. 3, components that are the same as in Figs. 1 and/or 2 are given the same reference numbers. Fig. 3 again shows the building 30 with the insulation assembly 1 in the crawl space 34 under the floor 7.

In the embodiment in Fig. 3, there is an insulation assembly T that has, under the bottom wall 2 of the part further coinciding with insulation assembly 1 , a further film 20, which together with the bottom wall 2 delimits a third cavity 21 that is located under the bottom cavity 5. A medium other than the gas displaced by the ventilation system is in this case passed through the third cavity 21 , for example groundwater, said medium exchanging heat with the gas in the bottom cavity and with the ground 14.

For example, groundwater is pumped with a pump 35 via the opening 37 through the extra cavity 21 and led to the opening 38, where it is led away again. Other possibilities are for example warm, used ventilating air, bath or shower water, excess heat from solar water heaters, etc., wherein this heat, if it is not required, is also stored in the ground 14 to be utilized later by the heat pump 15. The flow of the through-flowing gas is indicated here with a streamline 12 as a dotted line, which is indicated here in the heating state, and which is the other way round in the cooling state. The flow may be either upwards or downwards, depending on the desired climate in the inner space 8.

The flow-through insulation assembly 1 is connected to the evaporator of heat pump 15 and exchanges heat with it. If the inner space 8 has to be heated, the fan 13 forces the cooled through-flowing gas from the evaporator to the bottom cavity 5 and the gas exchanges heat with the extra medium in the cavity 21 , for example such as groundwater indicated with the streamline 22 in the extra cavity 21 and optionally also with the ground 14 under the bottom of the crawl space under the floor 7 of the inner space 8. Then the gas goes through the flow through insulation assembly 1 to the top cavity 6 and is warmed further by the conduction heat that will flow downwards through assembly 1. Then the gas flows via the top cavity 6 back to the evaporator part of the heat pump 15, where the gas is cooled further, so that it is colder than the temperature of the extra cavity 21 , after which the closed cycle is repeated again. In the bottom cavity 5, it is thus colder than the extra cavity 21 , and heat can only flow from the extra cavity 21 to bottom cavity 5 and the flow of the conduction heat from the floor 7 to the extra cavity 21 is blocked completely.

Thus, the air circulation of the air heat pump 15 is utilized for considerable improvement of the insulation of the insulation packet 1 of the inner space 8. Furthermore, the heat pump 15 does not need an outside unit with filter and fan, and obtains extra heat from the extra medium in the extra cavity 21 and optionally also from the ground 14.

The heat absorbed by the heat pump 15 is given up by means of the condenser according to the indicated streamlines 16 to a heating system that is not shown, for example such as floor heating, or to a boiler or other heat storage.

If the inner space 8 has to be cooled, the fan 13 forces the cooled gas to flow through from the evaporator part of the heat pump 15 to the top cavity 6 and it absorbs heat from the floor 7, which is cooled thereby. Then the gas goes through the flow-through insulation packet 1 to the bottom cavity 5 and the gas is warmed further by the conduction heat that will flow downwards through the assembly 1. Then the gas flows via the bottom cavity 5 where it gives up its heat to the extra cavity 21 and optionally the ground 14 and the gas flows to the evaporator of the heat pump 15, where it is cooled further, and after which the closed cycle is repeated again. The heat absorbed by the heat pump 15 can then be given up by means of the condenser to a system, for example such as a boiler or other heat storage.

Fig. 4 shows a schematic cross-section of a detail of an embodiment of the flow-through insulation assembly according to the present invention. The bottom wall 2, the top wall 3, and the perforated films 11a,b of the insulation packet 1 are in this case held with wires 17 at a maximum distance relative to each other as the closed flow-through space 4 is unfolded by pumping up by the circulating fan. At the perimeter 23 of the insulation assembly 1 , the peripheral wall 36, the bottom wall 2, the top wall 3, and the perforated films 11a,b have air-tight joints to each other, for example with glued, welded or sewn joints.

If the insulation assembly 1 is only used for heating purposes, wherein the air flow is upwards, then in a suitable embodiment the perforated films 11a and 11 b will float owing to the air resistance in the perforations, and wires 17 are not required.