EP3098527A1 - Method for operating a ventilation device for an area and corresponding ventilation device - Google Patents

Abstract

The invention relates to a method for operating a ventilation device for a room, wherein during a ventilation process by means of the ventilation device the room exhaust air is taken with a certain exhaust air mass flow and / or the outside ambient outside air taken with a certain outside air mass flow and fed into the room in the form of supply air, wherein an exhaust air relative humidity and an exhaust air temperature of the exhaust air and an outside air temperature of the outside air are measured. It is provided that from the relative exhaust air humidity, the exhaust air temperature and an assumed outside air relative humidity an outside air temperature limit is determined, the exhaust air mass flow and / or the outside air mass flow is / is increased when the relative air humidity exceeds a Abluftrelativfeuchenter value and the outside air temperature is less than the outside air temperature limit. The invention further relates to a ventilation device for a room.

Description

The invention relates to a method for operating a ventilation device for a room, wherein during a ventilation operation by means of the ventilation device the room exhaust air is taken with a certain exhaust air mass flow and / or the outside ambient outside air taken with a certain outside air mass flow and fed in the form of supply air to the room, wherein an exhaust air relative humidity and an exhaust air temperature of the exhaust air and an outside air temperature of the outside air are measured. The invention further relates to a ventilation device.

The ventilation device is preferably used for ventilation and / or air conditioning of the room. For example, the room is a living space, but of course it can also be of a different nature. In particular, the room is not meant to be a single room, although of course this may be the case. Preferably, the room generally describes an air volume. This can be in a single room of a building or house or alternatively spread over several rooms, especially the whole building.

The ventilation device can be designed as a decentralized ventilation device or as a central ventilation device or be part of a decentralized ventilation system or a central ventilation system. The ventilation device can serve the removal of exhaust air from the room, the supply of supply air into the room or both the removal of exhaust air and the supply of supply air. If the ventilation device is in operation, ie if the ventilation process is carried out, the room will be exhausted taken from the specific exhaust air mass flow. The exhaust air is subsequently supplied in the form of exhaust air to the outside environment. Additionally or alternatively, external air is taken from the outside environment, this being done with the determined outside air mass flow. Subsequently, the outside air is supplied in the form of supply air to the room.

The air in the air flow from the room to the ventilation device is referred to as exhaust air, while the air discharged from the ventilation device in the direction of the outside environment is called exhaust air. The air in the air flow from the outside environment to the ventilating device is referred to as outside air according to the above, while the air in the air flow from the ventilating device into the room is called supply air. Air present in the room can be called indoor air.

The exhaust air supplied by the ventilation device to the outside environment has a specific exhaust air mass flow, which preferably corresponds to the exhaust air mass flow. Conversely, the feeding of the supply air from the ventilation device takes place in the room with a certain supply air mass flow, which preferably corresponds to the outside air mass flow. The exhaust air mass flow and / or the outside air mass flow are determined based on at least one parameter and set on the ventilation device.

The ventilation device preferably has at least one air conveying device, in particular a fan. With the help of the air conveyor the air is taken from the room or the outside air from the outside. Of course, several Be provided air conveying means, wherein for example by means of a first of the air conveyors the room exhaust air and by means of a second of the air conveyors of the outside environment outside air is removed.

The air conveying device or the air conveying devices are now set such that the specific exhaust air mass flow and / or the specific outside air mass flow are present. For example, a control and / or regulation of the air conveyor is provided for this purpose, in particular a speed of the at least one air conveyor serves as a manipulated variable.

It is an object of the invention to provide a method for operating a ventilation device for a room, which has advantages over the prior art, in particular allows a reliable dehumidification of the room.

This is achieved according to the invention by a method having the features of claim 1. It is provided that from the relative exhaust air humidity, the exhaust air temperature and an assumed outside air moisture a Außenlufttemperaturgrenzwert is determined, the Abluftmassenstrom and / or the outside air mass flow is / is increased if the Abluftrelativfeuchte exceeds Abluftrelativfeuchenter value and the outside air temperature is less than the outside air temperature limit.

To carry out the process, the relative exhaust air humidity and the exhaust air temperature of the exhaust air are measured. In addition, the outside air temperature of the outside air is determined, in particular measured. The relative exhaust air humidity corresponds to the relative humidity the exhaust air taken from the room or the relative humidity of the room air present in the room. The exhaust air temperature is analogous to the temperature of the extracted air from the room or the temperature of the room air present in the room.

The external air relative humidity is determined or estimated in the context of the method according to the invention. For example, the external air three-phase humidity at the ventilation device is adjustable, in particular ex works or by a user of the ventilation device. In that regard, the external air relative humidity is a constant value, which can be specified manually. Alternatively, of course, the outside air three-phase humidity can be estimated or measured. The relative exhaust air humidity, the exhaust air temperature and the external air relative humidity are now summarized in the form of the outdoor air temperature limit. The outside air temperature limit is a function of the relative air outlet humidity, the exhaust air temperature and the external air relative humidity.

High ambient air humidities and low outdoor temperatures can lead to condensate formation in cold areas, especially on cold outer walls of the room. Furthermore, too high a room air relative humidity is perceived as stuffy. One aim of the method according to the invention is to reduce the relative humidity of the ambient air or the relative humidity of the exhaust air, or at least to limit it to the top.

If the exhaust air relative humidity now exceeds the exhaust air relative humidity limit value, it is desirable to increase the exhaust air mass flow and / or the outside air mass flow to moist air remove it from the room and / or supply dry air to the room. Accordingly, by increasing the exhaust air mass flow and / or the outside air mass flow only the relative air relative humidity and thus the relative room air relative humidity can only be reduced if the outside air absolute humidity is smaller than the exhaust air absolute humidity.

This results in two conditions which must be fulfilled so that the exhaust air mass flow and / or the outside air mass flow are increased. On the one hand, the relative air humidity of the exhaust must exceed the exhaust air relative humidity limit, ie be greater than this. On the other hand, the outside air temperature must be lower than the outside air temperature limit value, which was determined from the relative air relative humidity, the extract air temperature and the outside air relative humidity. The exhaust air relative humidity limit value is preferably adjustable on the ventilation device, in particular ex works and / or by the user of the ventilation device.

The increase of the exhaust air mass flow and / or of the outside air mass flow takes place, for example, as follows: First, a default exhaust air mass flow and / or default external air mass flow is determined, which is set, for example, by the user at the ventilation device. However, the default exhaust air mass flow and / or the default outer air mass flow may also result in the course of an automatic operation of the ventilation device, wherein they are determined as a function of at least one parameter.

Starting from this default exhaust air mass flow and / or default external air mass flow, the exhaust air mass flow is now increased and / or the outside air mass flow, so that the exhaust air mass flow actually set on the ventilation device is greater than the default exhaust air mass flow and / or the set outside air mass flow is greater than the default outside air mass flow.

According to the above explanations, it may be provided that the relative exhaust air humidity is determined by means of at least one humidity sensor. The humidity sensor may be provided either in the ventilation device, in particular in an exhaust air flow of the ventilation device or alternatively in the space, spaced from the ventilation device may be arranged. As already explained above, the relative outlet air humidity essentially corresponds to the room air relative humidity.

In a preferred embodiment of the invention, it can be provided that, when using a plurality of humidity sensors, the relative exhaust air humidity is set equal to the largest moisture measurement value of the humidity sensors. In that regard, not only a single humidity sensor is provided, which of course may be the case. The plurality of humidity sensors are arbitrarily arranged, for example, at least one of the humidity sensors or alternatively several humidity sensors are located in the ventilation device, in particular in the exhaust air flow. Additionally or alternatively, at least one further humidity sensor, in particular a plurality of other humidity sensors, may be arranged in the space, in particular spaced from the ventilation device.

Each of these humidity sensors now provides a moisture reading which is at the location of the respective moisture sensor Indicates relative air relative humidity or room air relative humidity. The relative exhaust air humidity, from which the outside air temperature limit is determined, now corresponds to the highest humidity value of the humidity sensors.

In a normal operation of the ventilation device, it may be provided that the exhaust air mass flow corresponds to the outside air mass flow, the space is thus removed by the ventilation device just as much air as it is supplied. However, this does not have to be the case. In at least one operating mode of the ventilation device, the exhaust air mass flow may be different from the outside air mass flow, that is to say either larger or smaller than this. Accordingly, more exhaust air is taken from the room as it supply air is supplied or vice versa. In extreme cases, it may be provided that the exhaust air mass flow or the outside air mass flow is set to zero, that is supplied to the room only supply air in the former case and in the latter case the space only exhaust air is removed.

A different from the exhaust air mass flow outside air mass flow is set in particular when it is detected on at least one open space closure element and / or building closure element. The space closure element or building closure element is for example a door, a window or the like. Preferably, through the space closure element or building closure element in its open state, there is a flow connection from the space into the outside environment, so that either air can escape from the room into the outside environment or can enter the room from the outside environment.

ermittelt wird, wobei ϑ₁ eine erste Temperaturgröße, x_AB eine Absolutfeuchte und ϑ₂ eine aus der angenommenen Außenluftrelativfeuchte ermittelte zweite Temperaturgröße ist.A preferred embodiment of the invention provides that the outside air temperature _limit value θ _AU , _max based on the equation $${\mathrm{\theta }}_{\mathrm{AU}.\mathrm{Max}}={\mathrm{\theta }}_1\ln \left({\mathrm{x}}_{\mathrm{FROM}}\right)-{\mathrm{<figure-callout\; id="2"\; label="\theta "\; filenames="imgf0001.png"\; state="\{\{state\}\}">\theta </figure-callout>}}_2$$

where θ _{1 is} a first temperature magnitude, x _{AB is} an absolute humidity, and θ _{2 is} a second temperature magnitude determined from the assumed outside air relative humidity.

The first temperature variable θ ₁ is, for example, a constant value which, in particular, is set invariably on the ventilation device, for example ex works. In this case, the first temperature variable can not be changed or adjusted by a user of the ventilation device. Of course, however, this may also be provided in an alternative embodiment. The first temperature size is given for example in the unit ° C and has a value of 10 ° C to 20 ° C, preferably 12 ° C to 16 ° C, preferably 14 ° C to 15 ° C or 14 ° C to 14.5 ° C on. For example, the first temperature size is 14 ° C, 14.1 ° C, 14.2 ° C, 14.3 ° C, 14.4 ° C or 14.5 ° C.

The absolute humidity x _AB , for example, corresponds to the absolute humidity of the exhaust air, so far as an absolute exhaust air humidity. The second temperature variable is determined from the external air relative humidity, so far from a function of the external air relative humidity. For example, the second temperature variable is determined based on a mathematical relationship, a map and / or a table from the external air relative humidity.

The second temperature quantity θ ₂ is preferably given in the unit ° C. For example, it has an external air relative humidity from 60% a value between 10 ° C and 11 ° C, in particular between 10.5 ° C and 11 ° C. At a relative external air humidity of 70%, the second temperature variable has a value of 12 ° C to 14 ° C, in particular from 12.5 ° C to 13.5 ° C. If the relative external air humidity is 80%, the second temperature variable may have a value between 14 ° C and 15 ° C, in particular a value of 14.5 ° C to 15 ° C.

angegeben werden. Auch eine Normalisierung der Absolutfeuchte auf eine einheitenlose Größe kann vorgesehen sein.In order to ensure that the outside air temperature limit can be determined from the equation, it may also be provided to limit the absolute humidity down to a value of zero. In this case, the equation can be considered $${\mathrm{\theta }}_{\mathrm{AU}.\mathrm{Max}}={\mathrm{\theta }}_1\ln \left(\mathrm{Max}\left(0,{\mathrm{x}}_{\mathrm{FROM}}\right)\right)-{\mathrm{<figure-callout\; id="2"\; label="\theta "\; filenames="imgf0001.png"\; state="\{\{state\}\}">\theta </figure-callout>}}_2$$

be specified. A normalization of the absolute humidity to a unitless size can also be provided.

A preferred embodiment of the invention provides that a constant value is used as the first temperature variable. This has already been pointed out above. The first temperature variable is so far fixed or immutable deposited in the ventilation device and can not be changed by the user of the ventilation device.

ermittelt wird, wobei x_max eine Maximalfeuchte und ρ_AB die Abluftrelativfeuchte ist. Die in der vorstehend angegebenen Gleichung verwendete Absolutfeuchte liegt insoweit als Funktion aus der Maximalfeuchte und der Abluftrelativfeuchte vor. Die Maximalfeuchte gibt dabei die maximale absolute Feuchtigkeit an und kann insoweit auch als Maximalabsolutfeuchte bezeichnet werden.A further embodiment of the invention provides that the absolute humidity based on the relationship $${\mathrm{x}}_{\mathrm{FROM}}={\mathrm{x}}_{\mathrm{Max}}{\mathrm{\rho }}_{\mathrm{FROM}}$$

where x _{max is} a maximum humidity and ρ _{AB is} the relative exhaust air humidity. The absolute humidity used in the above equation is insofar as a function of the maximum humidity and the relative air relative humidity. The maximum humidity indicates the maximum absolute humidity and can also be referred to as maximum absolute humidity.

oder anders ausgedrückt $$x_{\max }={\displaystyle \sum _{x=0}^m}{a}_x{\vartheta }_{\mathit{AB}}^x$$

verwendet wird. Die Beziehung zur Ermittlung der Maximalfeuchte kann insoweit beliebiger Ordnung, in den zuletzt angegeben Gleichungen als m bezeichnet, sein. Beispielsweise wird eine Beziehung erster Ordnung, zweiter Ordnung oder dritter Ordnung verwendet, wobei in letzterem Fall die Beziehung als $${\mathrm{x}}_{\max }={\mathrm{a}}_3{{\mathrm{\vartheta }}^3}_{\mathrm{AB}}+{\mathrm{a}}_2{{\mathrm{\vartheta }}^2}_{\mathrm{AB}}+{\mathrm{a}}_1{\mathrm{\vartheta }}_{\mathrm{AB}}+{\mathrm{a}}_0$$

angegeben werden kann.A preferred embodiment of the invention provides that the maximum moisture is determined from the exhaust air temperature, wherein the relationship $${\mathrm{x}}_{\mathrm{Max}}=\Sigma {\mathrm{a}}_{\mathrm{x}}{\mathrm{\theta }}^{\mathrm{x}}\mathrm{FROM}\left(\mathrm{with\; x}=\mathrm{0\; ..}\mathrm{m}\right)$$

or in other words $$x_{\mathrm{Max}}={\displaystyle \underset{x=0}{\overset{m}{\Sigma }}}{a}_x{\theta }_{\mathit{FROM}}^x$$

is used. The relationship for the determination of the maximum moisture can insofar arbitrary order, in the last given equations referred to as m be. For example, a first order, second order or third order relationship is used, in which case the relationship as $${\mathrm{x}}_{\mathrm{Max}}={\mathrm{a}}_3{{\mathrm{\theta }}^3}_{\mathrm{FROM}}+{\mathrm{a}}_2{{\mathrm{<figure-callout\; id="2"\; label="\theta "\; filenames="imgf0001.png"\; state="\{\{state\}\}">\theta </figure-callout>}}^2}_{\mathrm{FROM}}+{\mathrm{a}}_1{\mathrm{\theta }}_{\mathrm{FROM}}+{\mathrm{a}}_0$$

can be specified.

$${\mathrm{a}}_2=0,0095118829163135,$$

$${\mathrm{a}}_1=0,260953396021405,$$

und $${\mathrm{a}}_0=3,71104339859367.$$

The coefficients are preferably selected such that the relationship reproduces the saturation amount of water vapor in the air as accurately as possible, in particular in an operating temperature range the ventilation device, which extends in particular from - 20 ° C to +40 ° C. For example, the coefficients have the following values: $${\mathrm{a}}_3=0.000212680975552423.$$

$${\mathrm{a}}_2=0.0095118829163135.$$

$${\mathrm{a}}_1=0.260953396021405.$$

and $${\mathrm{a}}_0=3.71104339859367.$$

A further development of the invention provides that the second temperature variable is determined from the assumed outside air relative humidity by means of a mathematical relationship, a characteristic field and / or a table. This has already been pointed out above. In the latter case, for example, the second temperature variable is indicated in each case for several different values of the external air relative humidity. For example, the second temperature variable for which the outside air relative humidity assigned in the table is closest to the assumed outside air relative humidity is read from the table. Alternatively, the second temperature magnitude can also be determined by interpolation or extrapolation from the table, for example by linear interpolation.

In a further preferred embodiment of the invention, it is provided that the exhaust air mass flow and / or the outside air mass flow is / are increased only when the outside air temperature is smaller than the outside air temperature limit by an activation temperature difference. In such an embodiment, it is therefore not sufficient if the outside air temperature is less than the outside air temperature limit. Rather, it must be between the outside air temperature and the outside air temperature limit value is at least the activation temperature difference.

If the outside air temperature corresponds at least substantially to the outside air temperature limit value, then it can be assumed that the air present in the outside environment has a similar absolute humidity as the exhaust air or room air. Accordingly, no reduction in the humidity in the room can be achieved by increasing the exhaust air mass flow or the outside air mass flow. However, if the outside air temperature is at least smaller than the outside air temperature limit value by the activation temperature difference, it can be assumed that the outside air is drier than the exhaust air or room air.

In a further embodiment of the invention, it is provided that the exhaust air mass flow and / or the outside air mass flow is / are reduced again when the relative exhaust air humidity falls below a relative exhaust air humidity limit value by a certain deactivation moisture difference. As already mentioned, the aim of the method is to reduce the humidity in the room. Accordingly, the exhaust air mass flow or the outside air mass flow are increased if the relative exhaust air humidity exceeds the exhaust air relative humidity limit and, in addition, the outside air temperature is lower than the outside air temperature limit.

If the humidity in the room or the relative exhaust air humidity can be sufficiently reduced by this increase, the exhaust air mass flow and / or the outside air mass flow can be reduced again, in particular to their respective Initial value that they had before increasing. For example, in this case, the exhaust air mass flow corresponds to the above-mentioned default exhaust air mass flow and the outside air mass flow corresponds to the default outer air mass flow. To ensure that the humidity in the room has actually been reduced, the deactivation humidity difference is set, which is different from zero, in particular at least 2 percentage points, at least 4 percentage points, at least 6 percentage points, at least 8 percentage points or at least 10 percentage points.

Furthermore, it can be provided in a preferred embodiment of the invention that the outside air temperature limit is determined periodically, the exhaust air mass flow and / or the outside air mass flow is again reduced / is when the outside air temperature is greater than or equal to the outside air temperature limit. While the ventilator is operating at the increased exhaust mass flow and / or outdoor air mass flow, the conditions in the outdoor environment may change. This should be adequately addressed by periodically redetermining the outside air temperature limit and outside air temperature.

Thus, the exhaust air mass flow or the outside air mass flow is to be reduced again, in particular to the default exhaust air mass flow or the default external air mass flow, if the humidity in the room by the increased exhaust air mass flow or outside air mass flow can not be reduced because present in the outside environment, now changed humidity at least similar in the room is present humidity.

A development of the invention provides that the exhaust air mass flow and / or the outside air mass flow can only be increased if a winter mode is set on the ventilation device. At the ventilation device, several different operating modes can be set so far, for example, a summer mode and the winter mode. The adjustment can preferably be made by the user of the ventilation device. For this purpose, for example, suitable input means are provided. The humidity present in the room or the relative humidity of the exhaust air can be carried out particularly efficiently in cold and thus dry outside air. This is especially in winter. In summer, on the other hand, outdoor air is usually wetter due to the higher temperature, so reducing air humidity in the room can not be as efficient as in winter.

It may additionally or alternatively be provided that is switched depending on a current season between a summer mode and the winter mode. The current season is determined for example by means of a clock of the ventilation device or specified by a central office.

In a further preferred embodiment of the invention, it is provided that a desired exhaust air mass flow and / or a target external air mass flow is determined from the exhaust air relative humidity and the exhaust air mass flow is set to the desired exhaust air mass flow and / or the outside air mass flow to the desired external air mass flow. In that regard, it is not merely determined from the relative exhaust air humidity or the relative room air humidity, whether the exhaust air mass flow and / or the outside air mass flow increases should be. Rather, the exhaust air relative humidity is directly input to the desired exhaust air mass flow or the desired external air mass flow.

The desired exhaust air mass flow or the desired external air mass flow is thus present as a function of the relative exhaust air humidity. For example, it is provided that at a first value of the relative exhaust air humidity of the Sollabluftmassenstrom be set to a first Sollabluftmassenstrom and / or the desired outer air mass flow to a first Sollaußenluftmassenstrom. If, on the other hand, the exhaust air relative humidity has a second value, which is greater than the first value, the desired exhaust air mass flow should be set to a second target exhaust air mass flow and / or the target outer air mass flow to a second target outside air mass flow, the second desired exhaust air mass flow being greater than the first target exhaust air mass flow or the second Desired external air mass flow is greater than the first target external air mass flow.

Particularly preferably, a fixed relationship between values of the relative air relative humidity on the one hand and the desired exhaust air mass flow and / or the desired external air mass flow on the other hand is defined. For example, a linear relationship is provided here. Alternatively, of course, higher or lower order relationships can be used.

If, according to the above, a default exhaust air mass flow and / or a default external air mass flow are determined, then the larger value is selected, for example, from the default outer air mass flow and the desired outer air mass flow and the outside air mass flow at the ventilation device set this. Additionally or alternatively, it is possible to proceed for the default exhaust air mass flow and the desired exhaust air mass flow.

A further advantageous embodiment of the invention provides that the desired exhaust air mass flow and / or the desired external air mass flow is / are chosen to be higher the higher the relative exhaust air humidity. This has already been discussed above. The determination of the desired exhaust air mass flow and / or the desired outer air mass flow can be determined by means of a mathematical relationship, a characteristic map and / or a table, in particular from the exhaust air relative humidity.

A further development of the invention provides that the exhaust air and / or supply air for temperature control are passed through a heat exchanger or heat exchanger. The heat exchanger is so far provided to remove heat from the exhaust air and / or supply heat to the supply air. Particularly preferably, both the exhaust air and the supply air are passed through the heat exchanger, so that the heat taken from the exhaust air for tempering, in particular heating, the supply air can be used. Of course, it can also be provided to guide only a portion of the exhaust air and / or only a portion of the supply air through the heat exchanger, but this is preferably the case for the entire exhaust air or the entire supply air.

In a further embodiment of the invention, it is provided that an enthalpy exchanger is used as the heat exchanger. While of course the heat exchanger can be designed as a sensitive heat exchanger, it is particularly advantageous if it is present as Enthalpietauscher. The enthalpy exchanger, like the sensitive heat exchanger, has means for transferring heat, in particular from the exhaust air to the supply air. In addition, however, the enthalpy exchanger has means by which moisture can be exchanged, in particular transferred from the exhaust air to the supply air.

For this purpose, a film or membrane is provided in the enthalpy exchanger, for example for the fluidic separation of the supply air from the exhaust air, through which water vapor can diffuse, for example due to osmosis. The film or membrane consists for example of a polymer.

In a further embodiment of the invention it is provided that the exhaust air mass flow and / or the outside air mass flow are increased during an intensive ventilation mode. Normally, therefore, the ventilation device is operated for example in a normal mode. Once it is determined that the relative exhaust air humidity exceeds the exhaust air relative humidity limit and the outside air temperature is less than the outside air temperature threshold, the intensive ventilation mode is switched, in particular from the normal mode.

In the intensive ventilation mode, the exhaust air mass flow and / or the outside air mass flow are increased, for example, increasing takes place at or shortly after switching to the intensive ventilation mode. After the increase, it may be provided that during the further course of the intensive ventilation mode the increased exhaust air mass flow and / or the increased outside air mass flow be maintained constant until the intensive ventilation mode is terminated.

In a preferred embodiment of the invention, it is provided that at the beginning of the intensive ventilation mode, the exhaust air relative humidity is temporarily stored as the initial value. Immediately upon switching to the intensive ventilation mode, therefore, the output value of the relative air relative humidity is equated and stored. The output value remains stored throughout the duration of the intensive ventilation mode and is therefore constant.

A preferred embodiment of the invention provides that, during the intensive ventilation mode, the present instantaneous relative air humidity is compared with a comparison value determined from the initial value, wherein a bypass around the heat exchanger is at least partially opened when the relative outlet air humidity is greater than or equal to the comparison value. For example, the comparison value corresponds to the initial value. Alternatively, the comparison value can also be chosen to be smaller than the initial value, for example by a specific offset.

The comparison between the relative air relative humidity and the comparison value is made either continuously or at defined time intervals. If, during the comparison, it is determined that the relative exhaust air humidity is greater than or equal to the comparison value, ie the air humidity in the room is greater than the air humidity present at the beginning of the intensive ventilation mode, then the bypass is opened at least partially, in particular completely.

The bypass is preferably used to at least partially, in particular completely, guide the outside air or supply air around the heat exchanger. Such a procedure is particularly useful if the heat exchanger is designed as Enthalpietauscher. As already explained above, moisture can also be transferred in the enthalpy exchanger in addition to heat. However, this can be undesirable if the humidity in the room is too high or should be reduced. In particular, it makes sense to open the bypass when the humidity in the outdoor environment is greater than or equal to the humidity in the room.

A further embodiment of the invention provides that, when the bypass is at least partially opened, the supply air supplied to the room is heated by means of a heating device. If the supply air is passed through the bypass and the heat exchanger, it can not be heated in this. Accordingly, it is necessary to temper the supply air accordingly. For this purpose, the heater is provided. For example, the supply air by means of the heater to a certain temperature, in particular a preset temperature, which is set by the user of the ventilation device, set, in particular controlling and / or regulating set.

In a further preferred embodiment of the invention, it is provided that the space has a plurality of ventilation zones, each of which exhaust air with a certain proportion of the exhaust air mass flow is removed and / or each supply air is supplied with a certain proportion of the outside air mass flow. The room is divided into several ventilation zones. Each of the ventilation zones is separate Extractable air can be taken from other ventilation zones and / or supply air can be supplied. The extracted from all ventilation zones together exhaust air has in this respect the exhaust air mass flow, while the supply air supplied to all ventilation zones has the outside air mass flow. Of course, it may be provided that the number of ventilation zones, from which exhaust air is removed, is different from or corresponds to the number of ventilation zones into which supply air is supplied. For example, the number of ventilation zones, from which exhaust air is taken, is greater or smaller than the number of those ventilation zones, in which supply air is supplied. Also, a reverse configuration may be provided.

In a further embodiment of the invention it is provided that in the ventilation zones in each case a humidity is determined and the proportion of the exhaust air mass flow and / or the proportion of the outside air mass flow is increased for that ventilation zone / is in which the higher humidity exists. It is therefore not intended merely to increase the exhaust air mass flow and / or the outside air mass flow globally. Rather, the exhaust air mass flow or the outside air mass flow is selectively distributed locally to the ventilation zones. In this way, a homogenization of the air between the ventilation zones can be made.

It should be noted here that the ventilation zones do not have to be arranged directly in a fluid-connected manner. Thus, for example, the ventilation zones may be present in different rooms of a building, which describe in their entirety the space to which the ventilation device is assigned.

Of course, alternatively, the plurality of ventilation zones may also be present in a single room, which may accordingly be regarded as the room having the ventilation device.

The invention further relates to a ventilation device for a room, in particular for carrying out the method according to the preceding embodiments, wherein the ventilation device is adapted to remove the room exhaust air with a certain exhaust air mass flow during a ventilation operation and / or the outside ambient air with a certain outside air mass flow take and supply in the form of supply air to the room, with a relative exhaust air humidity and an exhaust air temperature of the exhaust air and an outside air temperature of the outside air are measured.

It is provided that the ventilation device is designed to determine from the Abluftrelativfeuchte, the exhaust air temperature and an assumed outside air relative humidity an outside air temperature limit, the exhaust air mass flow and / or the outside air mass flow is / is increased when the relative air humidity exceeds a Abluftrelativfeuchenter value and the outside air temperature is less than the outside air temperature limit is.

The advantages of such an approach or such an embodiment of the ventilation device has already been pointed out. Both the method and the ventilation device can be developed according to the above statements, so that reference is made to this extent.

Of course, the invention also relates to a room having a ventilation device according to the above. The room can be present, for example, as a room of a building or as the building itself.

Figur

ein Ablaufdiagramm eines Verfahrens zum Betreiben einer Lüftungseinrichtung für einen Raum.

The invention will be explained in more detail with reference to the embodiments illustrated in the drawings, without any limitation of the invention. The only one shows

figure

a flow diagram of a method for operating a ventilation device for a room.

The figure shows a flowchart in which a method for operating a ventilation device for a room is shown. The ventilation device is designed to remove the room exhaust air with a certain exhaust air mass flow during a ventilation operation by means of the ventilation device and / remove the outside environment outside air with a certain outside air mass flow and supply in the form of supply air to the room.

First, in a first step 1, an exhaust air relative humidity limit value is determined, for example by a user of the ventilation device. In a step 2, the exhaust air relative humidity of the exhaust air is measured. In a comparison 3, the measured relative air relative humidity is then compared with the set exhaust air relative humidity limit value. If it is smaller, the method is terminated in a step 4.

If, however, the relative exhaust air humidity is greater than the exhaust air relative humidity limit value, then an exhaust air temperature limit value is determined from an exhaust air temperature measured in a step 5 within the scope of a step 6 determined. This describes the temperature in the outdoor environment in which the humidity in the outdoor environment at most equal to, in particular less than, the humidity in the room.

In a step 7, an outside air temperature is now measured. This is compared in a step 8 with the outside air temperature limit. If it is determined that the outside air temperature is greater than or equal to the outside air temperature threshold, the process is terminated in a step 9. Otherwise, a step 10 is initiated. As part of this, the exhaust air mass flow and / or the outside air mass flow are increased in order to remove more air from the space and / or to supply it with more air. In this way, the humidity in the room can be lowered.

Claims (10)

A method for operating a ventilation device for a room, wherein extracted during a ventilation operation by means of the ventilation device the room exhaust air with a certain exhaust air mass flow and / or the outside ambient outside air is taken with a certain outdoor air mass flow and supplied in the form of supply air to the room, wherein a relative air relative humidity and an exhaust air temperature of the exhaust air and an outside air temperature of the outside air are measured, characterized in that from the relative air relative humidity, the exhaust air temperature and an assumed outside air relative humidity an outside air temperature limit is determined, the exhaust air mass flow and / or the outside air mass flow is / is increased when the relative air humidity exceeds a Abluftrelativfeuchtegrenzwert and the outside air temperature is lower than the outside air temperature threshold. A method according to claim 1, characterized in that the outside air temperature limit based on the equation $${\mathrm{\theta }}_{\mathrm{AU}.\mathrm{Max}}={\mathrm{\theta }}_1\ln \left({\mathrm{x}}_{\mathrm{FROM}}\right)-{\mathrm{\theta }}_2$$

where θ _{1 is} a first temperature magnitude, x _{AB is} an absolute humidity, and θ _{2 is} a second temperature magnitude determined from the assumed outside air relative humidity. Method according to one of the preceding claims, characterized in that a constant value is used as the first temperature variable. Method according to one of the preceding claims, characterized in that the absolute humidity based on the relationship $${\mathrm{x}}_{\mathrm{FROM}}={\mathrm{x}}_{\mathrm{Max}}{\mathrm{\rho }}_{\mathrm{FROM}}$$

where x _{max is} a maximum humidity and ρ _{AB is} the relative exhaust air humidity. Method according to one of the preceding claims, characterized in that the maximum moisture is determined from the exhaust air temperature, wherein the relationship $${\mathrm{x}}_{\mathrm{Max}}=\Sigma {\mathrm{a}}_{\mathrm{x}}{{\mathrm{\theta }}^{\mathrm{x}}}_{\mathrm{FROM}}$$

is used. Method according to one of the preceding claims, characterized in that the second temperature variable from the assumed outside air relative humidity by means of a mathematical relationship, a map and / or a table is determined. Method according to one of the preceding claims, characterized in that the exhaust air mass flow and / or the outside air mass flow are only increased / when the outside air temperature is smaller by an activation temperature difference than the outside air temperature limit. Method according to one of the preceding claims, characterized in that the exhaust air mass flow and / or the outside air mass flow is again reduced / is when the relative exhaust air humidity falls below an exhaust air relative humidity limit value by a certain deactivation moisture difference. Method according to one of the preceding claims, characterized in that the outside air temperature limit is determined periodically, wherein the exhaust air mass flow and / or the outside air mass flow is again reduced / when the outside air temperature is greater than or equal to the outside air temperature limit. Ventilation device for a room, in particular for carrying out the method according to one or more of the preceding claims, wherein the ventilation device is adapted to remove the room exhaust air with a certain exhaust air mass flow during a ventilation operation and / or remove the outside ambient air with a certain outside air mass flow and in the form of supply air to the room, wherein a relative exhaust air humidity and an exhaust air temperature of the exhaust air and an outside air temperature of the outside air are measured, characterized in that the ventilation device is adapted to determine from the Abluftrelativfeuchte, the exhaust air temperature and an assumed outside air three-dimensional humidity outside air temperature limit the exhaust air mass flow and / or the outside air mass flow is / are increased when the relative exhaust air humidity exceeds a relative exhaust air humidity limit value and the outside air temperature is lower than the exhaust air mass flow rate Outside air temperature limit is.

Images