The invention falls within the scope of building construction, namely within the special measures for providing ventilation in the window area. On the other hand, the invention can be placed within the scope of mechanical engineering, where it belongs to details in connection to the ventilation during the use of the heat exchanger.

The invention is based on the problem of designing a ventilation device that will be sufficiently efficient for actual needs, and will on the one hand allow being minimized to the extent where during the first installation or the replacement of windows in the event of renovation of buildings, it can be installed either into the window frame or optionally mounted into the building wall directly near this frame, and will on the other hand efficiently contribute to the substantial improvement of the energy balance of the respectively ventilated building.

AT 376 276 proposes a multiple glazed window with a heat exchanger, which is intended to be equipped with the supply and outflow air ducts. Furthermore, the heat exchanger enables the transfer of heat from the outflow air to the supply air flow that runs through the particle removal filter, if required, is envisaged. The inlet of supply air and the outlet of outflow air are performed by means of separate devices for forced circulation, especially fans; all of them powered by the relevant motor, in particular the electric motor. Moreover, both the inlet of supply air and the outlet of outflow air are equipped with a damping means, e.g. a grid, for air flow regulation.

One of the versions features a heat exchanger together with the corresponding ducts of supply and outflow air with installed fans and other elements, which is installed into the window frame. As the heat exchanger is constructed of either plates or pipes with the air flow in between, it is of relatively large dimensions. Consequently, due to large dimensions of the complete device, a significantly bigger opening for the installation of windows than with the regular windows must be provided, which results in either reducing the light transmitting surfaces after the installation or, at the very most, meeting these requirements already during the design of each building. Due to the abovementioned reasons, the option of subsequent installation of these windows is therefore hardly available.

This device is intended to be fitted into the wall next to the window or into the parapet area under the window, where due to the usually smaller depth available, the width and height of the device are accordingly larger. In order to avoid the abovementioned problems with large dimensions of the ventilation device, one of the AT 376 276 versions proposes the option of leading the flow of supply air through the profiles around the perimeter of the widow casement and the flow of outflow air through the profiles around the perimeter of the window frame if the window frame and the window casement are composed of hollow metal or plastic profiles, thus transferring the heat from the outflow air in the window frame to the flow of supply air in the window casement. As both the window casement and the window frame are on the hand exposed to the temperature of building interior and on other hand also to the temperature and all other effects in the building surroundings, while only a single surface for the transfer of heat from the flow of outflow air to the flow of supply air is positioned between them, the efficiency of the recovery that is designed in such a manner is highly questionable. Moreover, in such event, the use of relatively strong fans must be taken into account, ensuring the circulation of air through the profiles along the entire perimeter of the window casement or window frame, which relates to the specified energy consumption and other effects, e.g. noise. Furthermore, with such window design it is practically impossible to ensure the opening of the window for classic or natural ventilation purposes during the period of favourable climatic conditions.

This invention applies to the ventilation device, which comprises a housing with a fitted heat exchanger, connected to at least one opening positioned on the outer surface of the housing and at least one opening positioned on the inner surface of the housing, provided that the air flow through the heat exchanger is ensured, as well as at least one electric motor powered fan for sucking or pushing the air through the heat exchanger between the abovementioned openings and, moreover, also at least one filter for cleaning the air flow between the abovementioned openings and a control unit for controlling the operation of at least one abovementioned fan.

According to the invention, provision is made for at least one solar cell on the outer surface of the housing, which is intended for charging the battery in combination with the standard electric power supply, if required. Furthermore, the heat exchanger, attached to the thermally insulated cover of the housing, is designed as a plate fin heat exchanger, consisting of a thermoplastic material on the basis of polymers, and includes a set of through passages, where such exchanger comprises the primary part, connected to the outer inlet for the supply of air into the housing and the inner inlet, intended for the supply of air from the device into the respectively ventilated room, and the secondary part, connected to the inner outlet for the discharge of air from the room into the device and also the outer outlet for the discharge of air from the device into the surroundings of the respectively ventilated building. In addition, the device includes a control unit for controlling the motor of the respectively available fan depending on the outside air temperature and the air temperature within the area of inner inlet, namely the air being supplied into the respectively ventilated room.

One of the possible versions of the invention includes a fan, powered by the electric motor that is charge by the battery and controlled by the control unit. The fan is installed into the primary air duct, which runs between the outer inlet through the primary part of the heat exchanger and the inner inlet.

The alternative version of the device according to the invention includes the fan, powered by the electric motor that is charged by the battery and controlled by the control unit where the fan is installed into the secondary air duct, which runs between the inner outlet through the secondary part of the heat exchanger and the outer outlet.

A combined version with two fans is also possible, where the first fan, powered by the electric motor that is charged by the battery and controlled by the control unit, is installed into the primary air duct that runs between the outer inlet through the primary part of the heat exchanger and the inner inlet, while the other fan, powered by the corresponding electric motor that is also charged by the battery and controlled by the control unit, is installed into the secondary air duct that runs between the inner outlet through the secondary part of the heat exchanger and the outer outlet.

Furthermore, the abovementioned air inlets and outlets are primarily equipped with grids, where at least the outer openings, ie. the openings on the outer surface of the device outside the ventilated room, are equipped with the protective screen against insects. The invention also proposes that at least the outer outlet is equipped with an overpressure damper for preventing the intrusion of air in the event of external overpressure. Moreover, according to the invention, it is provided that the primary air duct, which runs between the outer inlet through the primary part of the heat exchanger and the inner inlet, contains a filter for coarse particles, while an optional filter for coarse particles can also be provided in the secondary air duct, which runs between the inner outlet through the secondary part of the heat exchanger and the outer outlet. According to the invention, it is of special importance whether the primary air duct, which runs between the outer inlet through the primary part of the heat exchanger and the inner inlet, includes a fine filter for retaining fine particles, especially pollen, depending on the direction of the air flow behind the coarse particle filter.

Moreover, according to the invention, it is provided that the device housing can either be mounted in a detachable manner on the outer profile perimeter of the regular window frame and can be together with the latter installed into the respectively available opening in the building, intended for the installation of the window, or alternatively, that the housing represents an integral part of the respectively available window frame.

Hereinafter, the invention will be explained in detail with version samples, illustrated in the attached figures that show:

Fig. 1 the ventilation device in perspective view during the use and from the outside;

Fig. 2 the ventilation device in perspective view during the use and from the inside;

Fig. 3 the schematic illustration of the device in longitudinal section according to Fig. 1 and 2;

Fig. 4 detail A according to Fig. 3 viewed from the opposite direction;

Fig. 5 version of the device, again shown schematically and in longitudinal section;

Fig. 6 the device shown in cross-section in the VI - VI plane according to Fig. 5;

Fig. 7 further version of the device, again shown schematically and in longitudinal section;

Fig. 8 the device shown in cross-section in the VIII - VIII place according to Fig. 7;

Fig. 9 one of the possible manners of installation of the device, viewed from the outside;

Fig. 10 the device according to Fig. 9, viewed from the inside; Fig. 11 the device shown in cross-section in the XI - XI plane according to Fig.9: Fig. 12 another possible manner of installation of the device, viewed from the outside; Fig. 13 the device according to Fig. 12, viewed from the inside.

According to the invention, provision is made for a device for the ventilation of buildings, which comprises the housing 1, representing either the integral part of the window frame 91 or can be optionally installed in a detachable manner directly next to the window frame 92 of the respectively window 9. The housing in the latter example may be equipped with click-in pin 16 that can be inserted into regular grooves 910 on the frame 91 perimeter of the window 9.

The abovementioned housing 1 is equipped with openings 11, 12, 13, 14, namely on the outer surface with the inlet opening 11 and air outlet opening 12, and on the inner surface with the opening 13 for the supply of air into the room and the opening 14 for the discharge of air from the room. Each of these openings 11, 12, 13, 14 is in principle covered by a grid of any shape, for example round, square, rectangular, polygonal. In addition, each of the outer openings 11, 12 is primarily equipped with a screen for preventing the entry of insects, not shown in the drawing, as well as a relevant grid for preventing the entry of precipitation. At least the grid of inner inlet opening 13 for the supply of air from the device into the respectively ventilated room is designed in to allow the change of direction and speed of injected air.

Furthermore, the abovementioned housing 1 includes a thermally insulated cover 15 with the attached heat exchanger 2, primarily a pair of fans 3, 4 with corresponding electric motors 30, 40, and also a filter unit 5, a battery 6, as well as at least one solar cell 7 and a relevant control unit 8 for controlling the operation of respectively available fans 3, 4.

The heat exchanger 2 is of the counter-flow type and is according to the invention designed as a plate fin heat exchanger , composed of thermoplastic material on the basis of polymers, and includes a set of through passages. The heat exchanger 2 therefore comprises the primary part 21, which runs between the outer inlet opening 11 and the inner inlet opening 13, as well as the secondary part 22, which runs between the inner outlet opening 14 and the outer outlet opening 12. Fans 3, 4 can be either axial or radial, each driven by a separate electric motor 30, 40, powered from the battery 6, which is charged by solar cells 7, placed on the outer surface of the housing 1, and, if required, also by the respectively available standard electric power supply. The control of the electric motors 30, 40 of these fans 3, 4 is performed by the control unit 9, which is designed as a microprocessor control of the ventilation system on the basis of the relevant operation software and two sensors for detecting the ambient temperature and the temperature of the air entering the respectively ventilated room, not shown in the drawing, and the timer and on/off switch, also not shown in the drawing, Optionally, the control includes also the indicator of operation and/or air temperature, a check of the filter dirtiness and the remote receiver for controlling.

The filter unit 5 in the version in question includes a coarse filter 51 and a fine filter 52 for filtering the supplied air and a coarse filter 53 for filtering the discharged air.

The device designed in such a manner is intended for the ventilation of rooms with minimum heat loss. The installed counter-flow heat exchanger 2 takes away the heat in the air that is being discharged from the room and transfers it to the ambient air that is being supplied into the room. In order to ensure the circulation of air in the displayed example, two fans 3, 4 are proposed, each driven by a separate electric motor 30, 40, electrically powered by the battery 6 that is charged by the solar cell 7, installed on the outer surface of the housing 1 or, if required, by the other electric power supply respectively available. The ambient air enters through the opening 11 for the ambient air, which includes grids that prevent the entry of precipitation into the device and a fine screen behind the grids for preventing the entry of insects. When the ambient air reaches the coarse filter 51, coarse particles are removed, while in the following fine filter 52 fine particles in the size of pollen are removed from the air as well. The air then flows through the inlet fan which pushes the air through the primary side 21 of the heat exchanger 2, e. the heat recuperator, where the air is warmed in the winter and cooled in the summer, if the ambient temperature is lower, after which the heated air enters the room through the inner inlet opening 13 at the temperature that at least approximately corresponds with the ambient temperature. This inner inlet opening 13 includes grids and is designed to allow the setting of the direction and speed of injected air.

The air exits the room and enters the device through the inner outlet suction grid 14 with low speed, while prior entering the secondary part 22 of the heat exchanger 2 it is cleaned in the coarse filter 53. The fan 4 sucks this exiting air through the heat exchanger 2, which represent the heat recuperator, and then pushes it along the relevant turning channel on the outer surface of the housing 1 through the outer outlet opening 12 into the open air, ie. the surroundings of the device. The outer outlet opening 12 includes overpressure dampers 121 and is positioned on the opposite side of the device, therefore, the mixing of discharge and outside air is prevented.

Electric motors 30,40 that propel both highly efficient fans 3,4 are powered by electricity, generated by solar cells 7, which is stored in the battery 6. In the event of longer absence of solar radiation or defect of solar cells 7, the battery 6 can also be charged from the standard electric power supply. In order to use the solar radiation as high as possible, the device can according to the invention include all types of solar cells, including the thin-layer solar cells, which perform well even with diffused light.

If required, filters 51, 52, 53 are changed in the device through special slots, accessible from the room. When the fans 51, 52, 53 need to be replaced, for example if they are dirty, the optional indicator light, which may be available for this purpose, is activated.

The device is controlled either manually or by a remote control. The control unit 8, which is installed into the device, enables the measurement of outside air temperature and temperature of air injected into the room. For protection against cooling, if the temperature of injected air falls below a set value, the device is switched off automatically. During the normal operation of the device, the control unit 8 according to the invention enables a simultaneous operation of both fans 3, 4. The additional version allows selection between the operation of only one fan 3 or 4, thus enabling overpressure or vacuum ventilation. This reduces and balances the air volume in very tight rooms. The remote control of the device operation can be performed by the remote control device, not shown in the drawing, designed in a similar manner than remote controls, designed for controlling air-conditioning machines or household appliances or radios and televisions.