Patent Description:
For many years now, ventilation has been used to recover heat from air extracted from a room of a building by transferring heat from the extract air, ETA, to outdoor air, ODA, entering the building. Such ventilation systems typically comprise a heat exchanger at a crossing point of a first and second air passageway, each having an inlet and outlet, such that the first and second air passageway are in a heat-exchanging relationship to each other.

Depending on the installation configuration plan, a building requires a left- or right-sided ventilation unit. Traditionally, the different models may be recognized by the placing of the internal components and the supply air connection, which is situated on left side of the unit on an left-sided unit and on the right hand side on an right-sided unit. Typically, such a heat exchange system comprises a bypass in the air flow passage between the extract air connection and the exhaust air connection to allow the ETA to bypass the heat exchanger. As such, a left- or right-sided system may also be defined depending on the location of the extract air connection and the exhaust air connection. It is thus understood that manufacturing specific left- or right-sided ventilation systems increases the scale of production and the size of stock to manage on the manufacturer. Moreover, contractors may deviate from the predetermined plan which might require a different sided ventilation system to be used.

One solution has been to manufacture one-sided ventilation systems designed for one side of the building, and rebuild/convert said systems to be fitted on the opposite side by converting the direction of parts of the ventilation system, such as the air passageways and the heat exchanger. However, this requires a skilled installer and a lot of time, and gives no guarantees against any malfunctions, such as internal or external leaks. As such, the airtightness of the ventilation system will no longer meet the required or predetermined standards.

A heat exchange system for use in a building ventilation system according to the preamble of claim <NUM> is known from document <CIT>.

An object of the invention may be to provide a heat exchange system which may be used as a left- or right-sided system without the need to rebuild or convert the configuration of the system.

Another object of the invention may be to provide a reliable heat exchange system which allows for providing simple installation and guaranteed reliability of the system.

Yet another object of the invention may be to provide an improved heat exchange system which allows for reducing production and/or storage costs.

Yet another object of the invention may be to provide a power efficient heat exchange system, which preferably requires less power to generate the same flow rate under the same external pressure.

The invention relates to a heat exchange system for use in a building as defined in claim <NUM>.

The first flow passage further comprises a first bypass branch which is adapted to bypass the heat exchanger, and a first bypass flow regulator is located in the first bypass branch, e.g. at one of the ends of the bypass branch. As such, the first bypass flow regulator may be used to divide the flow between the first main branch and the first bypass branch, and to control the amount of heat exchanged between the first and second main branch by adjusting the flow rate through the first main branch. For example, if the temperature for instance in a room, due to external uncontrolled influences, rises or lowers to an undesirable temperature and the outside temperature is at a more desirable temperature than the temperature at the first, then the first bypass branch may be used to at least partially bypass the heat exchanger in order to prevent the supply of air at an undesirable temperature. Advantageously, the temperature of the air to be supplied, SUP, may be effectively controlled and, when bypassing the heat exchanger, less power is required from the booster since the air does not have to be sucked through the heat exchanger.

Furthermore, the second flow passage further comprises a second bypass branch which is adapted to bypass the heat exchanger, and a second bypass flow regulator is located in of the second bypass branch, e.g. at one of the ends of the bypass branch. As a result of the above configuration, the first and second flow passage are interchangeable. For example, the first flow passage may be used for allowing the flow of air from inside to outside the building and optionally bypassing the heat exchanger using the first bypass branch, or the second flow passage may be used for allowing the flow of air from inside to outside the building and optionally bypassing the heat exchanger using the second bypass branch. In another example, the first and second bypass branch are used simultaneously bypass the heat exchanger. As such, there will be no flow of air through the heat exchanger. Thus, no heat will be exchange between the flow of air from inside to outside the building and the flow of air from inside to outside the building. Advantageously, by providing two bypass branches, the heat exchange system may be used in a left- or right-sided configuration without the need to rebuild or convert the system. Additionally, a reduction in the power consumption of the first and/or second boosters may be realized.

Alternatively, heat exchanger systems exist comprising a particular heat exchanger. Such a heat exchanger is for example described in document <CIT>. In the heat exchanger, the individual flow cross-section of flow passages of said plurality of first air flow passages in said parallel flow region and the individual flow cross-section of flow passages of said plurality of second air flow passages in said parallel flow region gradually, preferably linearly, decrease along a straight line perpendicular to the parallel air flow passages and from said first wall to said second wall of the block. The previously mentioned document requires disabling the heat exchange function by partially blocking the inlet or outlet of the heat exchanger. However, it has been realized that such a ventilation system reduces the flow rate of air within the system under same external pressure. As a result, such a ventilation system requires higher power consumption to realize the same flow rate of air under the same external pressure.

In an embodiment of the invention, the housing may be provided with a control unit adapted to control the first bypass flow regulator in order to regulate the flow of air through the first bypass branch and/or adapted to control second bypass flow regulator in order to regulate the flow of air through the second bypass branch. For example, the control unit may be adapted to control a first/second bypass valve by opening or closing the valve. The bypass valve may be provided in an open, closed or intermediate position. Advantageously, the flow rate of air through and/or bypassing the heat exchanger may be efficiently controlled. In a preferred embodiment, the control unit is adapted to control the first bypass flow regulator and second bypass flow regulator.

In a second aspect according to the invention, optionally in combination with the other aspects described herein, the control unit may be adapted to control the first bypass flow regulator and/or the second bypass flow regulator on the basis of a sensor signal related to a measurement performed by a sensor. The sensor may be a temperature sensor, a pressure sensor, a vacuum sensor, or a particle size sensor.

In an embodiment of the invention, the control unit may be adapted to control the first bypass flow regulator on the basis of a first sensor signal related to a first measurement performed by a first sensor, and adapted to control the second bypass flow regulator on the basis of a second sensor signal related to a second measurement performed by a second sensor.

In another embodiment of the invention, the control unit may be adapted to control the first and second bypass flow regulator on the basis of the temperature of the air flowing through the first main air connection and the second secondary air connection or through the first and second bypass branch.

According to the invention, optionally in combination with the other aspects described herein, the control unit may be adapted to control the first bypass flow regulator and/or the second bypass flow regulator on the basis of a configurational setting related to the working configuration of the heat exchange system. In other words, the control unit controls at least one of the flow regulator based on a setting associated with the physical layout of the connections, e.g. a first setting may be associated with a layout in which a connection on the left side is adapted to provide supply air, SUP, during use and a first setting may be associated with a layout in which a connection on the right side is adapted to provide supply air, SUP, during use. The configurational setting is one of a configurational setting associated with a left-handed system and a configurational setting associated with a right-handed system.

Advantageously, the heat exchange system may be configured to work as for example a left- or right-sided system without requiring any rebuild or convert the configuration of the system. In a first configuration of the heat exchange system, the first bypass flow regulator is maintained in a closed position in order to prevent the flow of air through the first bypass branch. In a second configuration of the heat exchange system, the second bypass flow regulator is maintained in a closed position in order to prevent the flow of air through the second bypass branch. In a third configuration of the heat exchange system, the control unit is adapted to control the first bypass flow regulator on the basis of the position of the second bypass flow regulator and/or control the second bypass flow regulator on the basis of the state of the first bypass flow regulator.

In an embodiment of the invention, the control unit may be adapted to adjust the configurational setting of the heat exchange system on the basis of the temperature of the air flowing through the first main air connection and the second secondary air connection or through the first and second bypass branch. Advantageously, the configurational setting may be adjusted based on the temperature of the air flowing in the heat exchange system. For example, by comparison of the temperature of the air flowing in the heat exchange system via the second secondary air connection, and the air flowing in the heat exchange system via the first main air connection, the source of the air may be determined: inside or outside the building. As such, the configurational setting may be adjusted on the basis of the determined air source of each flow passage.

In another embodiment of the invention, the control unit may be adapted to adjust the configurational setting of the heat exchange system on the basis of a user input or a user input signal related to the user input.

In a fourth aspect according to the invention, optionally in combination with the other aspects described herein, the housing may be provided with a user interface configured to allow communication between a user and the control unit. The user interface may display, indicate or otherwise communicate information to the user. For example, malfunctions of the system may be communicated to the user via error codes, light indicator, or other means through the user interface. As a result problem solving measures may be taken efficiently and in a timely manner by the user. Furthermore, maintenance/calibration checks may be performed through the user interface, thereby allowing for more efficient maintenance/calibration of the system.

In an embodiment of the invention, the user interface may be configured to display indicators representative of the configuration to of the heat exchange system. Advantageously, such an indication allows the user, for example an installer, to correctly and reliably install the system. Furthermore, this allows for simple maintenance checks of the system.

In another embodiment of the invention, the user interface may be configured to display indicators representative of the function of each connection, e.g. indicating which connection is to be used as the extract air, ETA, connection; exhaust air, EHA, connection; outdoor air, ODA, connection; or supply air, SUP, connection.

In a further embodiment of the invention, the housing may be provided with a first condensation drain and a second condensation drain. The first and second condensation drains may be provided on opposite sides of the heat exchange system to allow easy installation. Advantageously, the condensed air may be efficiently drained in any one of the left and right configurations. Preferably the user interface may be configured to display indicators representative of the function of each drain connection, e.g. indicating the drain connection to be connected to a drain duct and indicating the drain connection to be closed off. As a result, the user or installer may effectively collect condensed water from the correct condensation drain and store said water in a water storage unit to reuse the condensed water, or dispose of the said water.

In yet another embodiment of the invention, the user interface may be configured to allow the user to select or change the configurational setting related to the (working) configuration of the heat exchange system, which may be for example a left or right configuration. The user interface is provided for enabling at least one adjustable setting, i.e. the configurational setting, related to the heat exchange system to be manipulated in response to selections and/or inputs made by an operator according to the preferences of the operator. The preferred configuration may be for example be selected from a list of one or more predetermined settings which may be stored in a memory module.

In some embodiments, the housing may be provided with a filtering unit for filtering outside air before said air enters the housing which is located in the first flow passage and/or in the second flow passage. The filtering unit may be located in the first bypass branch of the first flow passage and/or in the second bypass branch of the second flow passage. Advantageously, the air flowing via the first bypass branch and/or the second bypass branch is filtered, resulting in filtered air that bypasses the heat exchanger.

In another aspect of the invention, there is provided a heat exchange ventilation system for use in a building comprising several rooms, a first secondary air duct and a second secondary air duct, a first main air duct and a second main air duct as well as a heat exchange system, preferably according to embodiments of the present invention. According to the heat exchange ventilation system, the first secondary air duct is connected to the first secondary air connection of the heat exchange system and to a room, the second secondary air duct is connected to the second secondary air connection of the heat exchange system and to a room, the said first main air duct is connected to the first main air connection and the second main air duct is connected to the second main air connection of the heat exchange system. Furthermore, the second flow passage further comprises a second bypass branch which is adapted to bypass the heat exchanger, and a second bypass flow regulator which is located in the second bypass branch.

In a yet another aspect of the invention, there is provided a building comprising several rooms, a first secondary air duct and a second secondary air duct, a first main air duct and a second main air duct as well as a heat exchange system, preferably according to embodiments of the present invention. According to the building, the first secondary air duct being connected to the first secondary air connection of the heat exchange system and to a room, said second secondary air duct being connected to the second secondary air connection of the heat exchange system and to a room, the first main air duct is connected to the first main air connection and said second main air duct is connected to the second main air connection of the heat exchange system. Furthermore, the second flow passage further comprises a second bypass branch which is adapted to bypass the heat exchanger, and a second bypass flow regulator which is located in the second bypass branch.

Advantageously, due to the circumstance that the actively controlled bypass flow regulators are positioned in the housing of the heat exchange system, there is no need to have such flow regulators in the rooms or zones of the building.

Further objectives, features and advantages of the heat exchange system according to the present invention will be apparent from the description below and the appended drawings. Objectives, features and advantages of the method of controlling described herein will also be apparent.

The present invention will be explained in more detail below with reference to drawings in which illustrative embodiments thereof are shown. They are intended exclusively for illustrative purposes and not to restrict the inventive concept, which is defined by the appended claims.

The terms are interchangeable under appropriate circumstances and the embodiments of the invention may operate in other sequences than described or illustrated herein.

Furthermore, the various embodiments, although referred to as "preferred" are to be construed as exemplary manners in which the disclosure may be implemented rather than as limiting the scope of the invention.

The term "comprising", used in the claims, should not be interpreted as being restricted to the elements or steps listed thereafter; it does not exclude other elements or steps. It needs to be interpreted as specifying the presence of the stated features, integers, steps or components as referred to, but does not preclude the presence or addition of one or more other features, integers, steps or components, or groups thereof. Thus, the scope of the expression "a device comprising A and B" should not be limited to devices consisting only of components A and B, rather with respect to the present invention, the only enumerated components of the device are A and B, and further the claim should be interpreted as including equivalents of those components.

Different embodiments of the present invention will be described more fully hereinafter with reference to the enclosed drawings. The embodiments disclosed herein can, however, be realized in many different forms and should not be construed as being limited to the aspects set forth herein.

<FIG> shows a building comprising several, in this exemplary embodiment four, rooms <NUM>', <NUM>", <NUM>', <NUM>" and hall <NUM>. The building further comprises a main air supply duct, provided in the form of a first main air duct <NUM>, for supplying outdoor air, ODA, to an outdoor air connection of a heat exchange system <NUM> and a main air discharge duct, provided in the form of a second main air duct <NUM>, for discharging exhaust air, EHA, to an exhaust air connection of the heat exchange system <NUM>. In a first configuration of the heat exchange system <NUM>, the outdoor air connection is provided in the form of the first main air connection <NUM> and the exhaust air connection is provided in the form of the second main air connection <NUM>. In a second configuration of the heat exchange system <NUM>, the outdoor air connection is provided in the form of the second secondary air connection <NUM> and the exhaust air connection is provided in the form of the first secondary air connection <NUM>. Furthermore, the building further comprises a secondary air supply duct, provided in the form of a first secondary air duct <NUM>, for supplying supply air, SUP, from a supply air connection of the heat exchange system to a room <NUM>', <NUM>", <NUM>', <NUM>'', and comprises a secondary air discharge duct, provided in the form of a second secondary air duct <NUM>, for discharging extract air, ETA, from a room <NUM>', <NUM>'', <NUM>', <NUM>'' to an extract air connection of the heat exchange system. In embodiments, each one of the first and second secondary air ducts <NUM>, <NUM> may be connected to one or more manifolds (not shown) to supply air to multiple rooms <NUM>', <NUM>", <NUM>', <NUM>'' and/or further to a hall <NUM>. Each of the one or more manifolds may be connected to at least two branches, wherein each branch is connected to a respective room or hall. In the first configuration of the heat exchange system <NUM>, the supply air connection is provided in the form of the first secondary air connection <NUM> and the extract air connection is provided in the form of the second secondary air connection <NUM>. In the second configuration of the heat exchange system <NUM>, the supply air connection is provided in the form of the second main air connection <NUM> and the extract air connection is provided in the form of the first main air connection <NUM>.

<FIG> show cross-sectional views of the heat exchange system <NUM>. The heat exchange system <NUM> has a housing, designated as a whole as <NUM>. The top side of the housing <NUM> is provided with a first main air connection <NUM> to which the first main air duct <NUM> is connectable and with a second main air connection <NUM> to which the second main air duct <NUM> is connectable. At the same side of the housing <NUM>, a first and second secondary air connection <NUM>, <NUM> are provided. The first secondary air duct <NUM> is connectable to the first secondary air connection <NUM> and the second secondary air duct <NUM> is connectable to the second secondary air connection <NUM>. A first flow passage <NUM> extends between the first main air connection <NUM> and the first secondary air connection <NUM>. Correspondingly, a second flow passage <NUM> extends between the second secondary air connection <NUM> and the second main air connection <NUM>. A heat exchanger, designated as a whole as <NUM>, is provided in a first main branch <NUM> of said first flow passage <NUM> and a second main branch <NUM> of said second flow passage <NUM>. The heat exchanger <NUM> ensures that thermal energy is exchanged between the air, e.g. ODA/SUP, flowing in the first main branch <NUM> and the air, e.g. ETA/EHA, flowing in the second main branch <NUM>'. The air flow is ensured by means of two boosters, the first booster <NUM> is placed in the first flow passage <NUM> and the second booster <NUM>' is placed in the second flow passage <NUM>.

The first flow passage <NUM> further comprises a first bypass branch <NUM> which is adapted to bypass the heat exchanger <NUM>, and a first bypass flow regulator <NUM> which is located in the first bypass branch <NUM>, i.e. at the end of the first bypass branch <NUM>. Correspondingly, the second flow passage <NUM> further comprises a second bypass branch <NUM>' which is adapted to bypass the heat exchanger <NUM>, and a second bypass flow regulator <NUM>' which is located in the second bypass branch <NUM>', i.e. at the end of the second bypass branch <NUM>'.

As shown in <FIG>, the housing <NUM> is further provided with a first condensation drain <NUM>, which is located at the side of the first secondary air connection <NUM>, preferably at the side of the first booster <NUM>. As shown in <FIG>, the housing <NUM> is further provided with a second condensation drain <NUM>, which is located at the side of the second main air connection <NUM>, preferably at the side of the second booster <NUM>'.

As shown in <FIG>, the housing is provided with a control unit <NUM> configured to control the first and second bypass flow regulators, provided in the form of first and second bypass valves <NUM>, <NUM>', to regulate the flow through the respective bypass branch. For example, the control unit <NUM> may position the bypass valves in an open, closed or intermediate position. The control unit <NUM> may be electrically connected to the first and second bypass flow regulators <NUM>, <NUM>', wherein the control unit <NUM> transmits control signals to the first and second bypass flow regulators <NUM>, <NUM>'.

The control unit <NUM> is configured to adjust the heat exchange system <NUM> to a preferred configuration, i.e. at least a first and second configuration. In the first configuration of the heat exchange system, the first bypass flow regulator is maintained in a closed position in order to prevent the flow of air through the first bypass branch. In the second configuration of the heat exchange system the second bypass flow regulator is maintained in a closed position in order to prevent the flow of air through the second bypass branch. In the first and second configuration, the control unit <NUM> is adapted to control the respective other bypass flow regulator, i.e. the bypass flow regulator not maintained in a closed position, preferably based on a sensor measurement of for example a temperature, a pressure, or a particle size, or any other suitable parameter.

As shown in <FIG>, the housing <NUM> may further be provided with a user interface <NUM> configured to allow communication between a user and the control unit <NUM>. The control unit <NUM> may be coupled to the user interface, which provides the control unit <NUM> with the ability to connect to mobile devices such as laptop computers, handheld computers, smart phones, etc. The control unit <NUM> may further be coupled to parts of the user interface, such as input and output means. The input means may be in the form of a keypad, touchscreen, button, or other inputting means capable of entering information to the control unit <NUM>. The output may be a liquid crystal display, a light-emitting diode (LED) light or display, an optical LED (OLED), an active matrix OLED (AMOLED), or other output capable of rendering notifications, text and/or at least limited graphics from the control unit <NUM>.

The user may through the user interface select between the first, second or other predetermined configurations of the heat exchange system <NUM>. The control unit <NUM> is configured to receive a signal related to the selected configuration and adjust the heat exchange system <NUM> accordingly, by controlling the first and/or the second bypass flow regulators <NUM>, <NUM>'.

The user interface <NUM> may indicate the configuration to which the heat exchange system <NUM> is adjusted, particularly through the output, such as in the form of a notification, text, graphics, etc. The user interface may further indicate which one of the first and second condensation drains <NUM>, <NUM> is to be used.

In embodiments according to the present invention, the control unit <NUM> may comprise a processing module (not shown) which is configured to gather one or more temperature measurements of the air flowing through the at least one of the first main air connection <NUM> and the second secondary air connection <NUM>. The temperature of supplied air may be measured by one or more temperature sensors located at least in or at the end(s) of the first main air duct <NUM>, the first main air connection <NUM>, the first flow passage <NUM> or the first secondary air connection <NUM>, preferably the end(s) of the first main air duct <NUM> and/or the first main air connection <NUM>. Correspondingly, the temperature of discharged air may be measured by one or more temperature sensors located at least in or at the end(s) of the second main air duct <NUM>, the second secondary air connection <NUM>, the second flow passage <NUM> or the second main air connection <NUM>, preferably the end(s) of the second main air duct <NUM> and/or the second secondary air connection <NUM>.

In embodiments according to the present invention, the processing module may be further configured to gather one or more humidity measurements of the air flowing via the first and second flow passages <NUM>, <NUM>. The humidity of supplied air may be measured by one or more humidity sensors located at similar locations to the one or more temperature sensors used for measuring temperature of the supplied air, preferably the one or more humidity sensors are located at least at the site of the first condensation drain <NUM>. Correspondingly, the humidity of discharged air may be measured by one or more humidity sensors located at similar locations to the one or more temperature sensors used for measuring temperature of the discharged air, preferably the one or more humidity sensors are located at least at the site of the second condensation drain <NUM>.

These one or more temperature and/or humidity measurements may be stored in a memory module. The processing module may gather the one or more temperature and/or humidity measurements from the one or more sensors and/or the memory module. The processing module may further compute a first average temperature and/or humidity from the one or more temperature and/or humidity measurements of the supplied air and/or a second average temperature and/or humidity from the one or more temperature and/or humidity measurements of the discharged air.

The memory module may store data or commands received from or generated by the processing module or the user interface. The memory module may include an internal memory or an external memory. The internal memory may include, for example, at least one of a volatile memory (for example, a Random Access Memory (RAM), a dynamic RAM (DRAM), a static RAM (SRAM), a synchronous dynamic RAM (SDRAM), and the like), and a non-volatile Memory (for example, a Read Only Memory (ROM), a one-time programmable ROM (OTPROM), a (electrically erasable and) programmable ROM (PROM), a flash memory, and the like). The external memory may include a flash drive, for example, a Compact Flash (CF), a Secure Digital (SD) a Micro Secure Digital (Micro-SD), a Mini Secure Digital (Mini-SD), an extreme Digital (xD), a memory stick or a storage medium (e.g. a hard drive). The external memory may be functionally connected to the control unit <NUM> through the user interface or other connecting interfaces.

The processing module may be further configured to determine whether each of the one or more temperature measurements or the average temperatures pass a predefined threshold. The processing module is further configured to, upon determining that the each of the one or more temperature measurements and/or the average temperatures pass the predefined threshold, send signals to the control unit <NUM> to perform an (in)action, which may be to at least partially open or close the first or second bypass flow regulators <NUM>, <NUM>'.

The step of determining whether each of the one or more temperature measurements and/or the average temperatures pass a predefined threshold may comprise computing a percentage difference between the predefined threshold and the one or more temperature measurements or the average temperatures. Furthermore, the control unit <NUM> may perform the (in)action directly related to the computed percentage difference. For example, a margin of <NUM>% above or below the predefined threshold may be set to slightly open or close the first or second bypass flow regulator <NUM>, <NUM>', and a margin of <NUM>% above or below the predefined threshold may be set to greatly open or close the first or second bypass flow regulator <NUM>.

Furthermore, the processing module may be further configured to determine whether each of the one or more humidity measurements or the average humidity pass a predefined threshold. The processing module is further configured to, upon determining that the each of the one or more humidity measurements and/or the average humidity pass the predefined threshold, send signals to the control unit <NUM> to perform an (in)action, which may be to at least partially open or close the first or second drain regulators.

The one or more predefined thresholds may be stored in the memory module. The user may through the user interface select the one or more predefined thresholds. The user may further create a ventilation program for a pre-set period. Here the pre-set period may be hourly, daily, weekly, monthly, seasonally, and the like. For example, the user may set a higher temperature threshold for the winter season than for the summer season or the night than for the day.

Claim 1:
Heat exchange system (<NUM>) for use in a building ventilation system, comprising a housing (<NUM>) which contains:
a first flow passage (<NUM>) having a first main air connection (<NUM>) at one end of the first flow passage, at the other end of which first flow passage a first secondary air connection (<NUM>) is located, a first booster (<NUM>) for ensuring the flow of air through the first secondary air connection (<NUM>) via the first flow passage (<NUM>) and the first main air connection (<NUM>),
a second flow passage (<NUM>) having a second main air connection (<NUM>) at one end of the second flow passage, at the other end of which second flow passage a second secondary air connection (<NUM>) is located,
a second booster (<NUM>') for ensuring the flow of air via the second main air connection (<NUM>), the second flow passage (<NUM>) and the second secondary air connection (<NUM>), and
a heat exchanger (<NUM>) by means of which at least a first main branch (<NUM>) of the first flow passage (<NUM>) and at least a second main branch (<NUM>') of the second flow passage (<NUM>) are in a heat-exchanging relationship to each other,
wherein the first flow passage (<NUM>) further comprises a first bypass branch (<NUM>) which is adapted to bypass the heat exchanger (<NUM>), and a first bypass flow regulator (<NUM>) which is located in the first bypass branch (<NUM>),
wherein the second flow passage (<NUM>) further comprises a second bypass branch (<NUM>') which is adapted to bypass the heat exchanger (<NUM>), and a second bypass flow regulator (<NUM>') which is located in the second bypass branch (<NUM>'),
characterized in, that the housing is provided with a control unit (<NUM>) adapted to control the first bypass flow regulator (<NUM>) in order to regulate the flow of air through the first bypass branch (<NUM>) and/or to control the second bypass flow regulator (<NUM>') in order to regulate the flow of air through the second bypass branch (<NUM>),
that the control unit (<NUM>) is adapted to control the first and/or second bypass flow regulator on the basis of a configurational setting associated with a left-handed system in which a connection on the left side is adapted to provide supply air (SUP) during use or a right-handed system in which a connection on the right side is adapted to provide supply air (SUP) during use, and
that said configurational setting is adjustable on the basis of a user input signal.