WO2015028470A1

WO2015028470A1 - Heat exchanger device for a greenhouse

Info

Publication number: WO2015028470A1
Application number: PCT/EP2014/068092
Authority: WO
Inventors: Uwe Schmidt
Original assignee: Humboldt-Universität Zu Berlin
Priority date: 2013-08-29
Filing date: 2014-08-26
Publication date: 2015-03-05
Also published as: DE102013217286B4; DE102013217286A1

Abstract

The invention relates to a heat exchanger device (2) for a greenhouse (1), comprising at last one pipeline (20) through which a fluid flows in the cooling mode for withdrawing heat from the greenhouse (1), and a support device (21) for arranging the at least one pipeline (20) in a greenhouse (1). According to the invention, said support device (21) is designed to adjust said at least one pipeline (20) in such a way that the at least one pipeline (20) can be adjusted between an upper position (H2) and a lower position (H0).

Description

Heat exchanger device for a greenhouse

description

The invention relates to a heat exchanger device for a greenhouse according to the preamble of claim 1, a greenhouse with a heat exchanger device and a method for operating a heat exchanger device for a greenhouse.

Such a heat exchanger device for a greenhouse comprises at least one pipeline, which is traversed by a fluid in a cooling operation for extracting heat from the greenhouse, and a carrier device for arranging the at least one pipeline in a greenhouse.

As a result of the scarcity of resources and the associated increase in energy prices, horticultural businesses with greenhouses nowadays switch to alternative energy supply. In order to be able to gain solar energy from closed operated greenhouses, it is necessary to cool greenhouses. The cooling of the greenhouses by heat extraction with closed ventilation brings here also in summer at high outdoor temperatures also has the advantage that technical C0 _{2 can be introduced} to increase the photosynthetic rates of the plants all day in the greenhouses, without that initiated C0 ₂ can escape through the ventilation again , Cooling of greenhouses is also required, especially at high temperatures, to protect plants grown in the greenhouses. In order to cool greenhouses, essentially three approaches have been followed. On the one hand, heat from greenhouses can be extracted via an air exchange by means of a suitable ventilation system. Secondly, cooling via a heat exchanger device can be achieved by using suitable refrigeration technology become. And thirdly, a so-called latent cooling on mist systems or a mats cooling can be effected.

Cooling by air exchange or using a heat exchanger device has conventionally the disadvantage that comparatively large amounts of air must be moved to effect an exchange of air in a greenhouse or to move the air to be cooled past a heat exchanger. In the conventional conventional use of heat exchangers, which are installed in a place in the greenhouse, there is also the disadvantage that the temperature and moisture distribution in the greenhouse is relatively non-uniform, due to the fact that usually sucked warm air in an attic of a greenhouse and after passing the heat exchanger cool, dry air is blown back into the greenhouse.

As an alternative to such heat exchange devices, which aspirate warm, humid air and blow out cool, dry air, studies have been carried out on the use of heat exchanger units installed freely in a greenhouse, which cool the greenhouse and condense out the water vapor emitted by the plants (cf. Article by JB Campen et al., "Dehumidification in Greenhouses by Condensation on Finned Pipes", Biosystems Engineering (2002), 82 (2), 177-185) .These heat exchanger devices include continuous piping, such as spiral finned tubes, in an attic space a greenhouse are firmly installed and are thus flowed around by ascending, warm, humid air in the greenhouse.

The use of such installed in a roof space of a greenhouse heat exchanger devices for the cooling of the greenhouse has the advantage that no fans for moving the air are required, which reduces the energy consumption for the greenhouse operation. In addition, with such installed in the roof space heat exchanger devices with continuous pipelines a uniform temperature and humidity distribution over a cultivated area in a greenhouse can be achieved.

But such heat exchanger devices also bring with it the disadvantage that the installation in the attic of a greenhouse can lead to shading and thus to a reduced incidence of light on plants located in the greenhouse. Due to the reduced light incidence caused by the installed by the Pipelines caused shading such heat exchanger devices have not been used to a large extent.

The object of the present invention is to provide a heat exchanger device for a greenhouse, a greenhouse with a heat exchanger device and a method for operating a heat exchanger device which, on the one hand, permit economically favorable cooling operation for cooling which is favorable for plants, but on the other hand have a disadvantage avoid possible shading of light on plants.

This object is achieved by a heat exchanger device for a greenhouse with the features of claim 1.

Accordingly, the support means for adjusting the at least one pipe is formed such that the at least one pipe between an upper position and a lower position is adjustable.

The upper position can be approximated to a roof of the greenhouse, in particular in the case of proper arrangement of the heat exchanger device in a greenhouse, while the lower position is in accordance with the arrangement of the heat exchanger device in a greenhouse below a plant gutter, to be arranged in the plants.

The present invention is based on the idea of pipes of a heat exchanger device, which are flowed through by a (cool) fluid in a cooling operation for extracting heat from the greenhouse, not fixed to install in a greenhouse, but to arrange movably in a greenhouse such that they can be adjusted between different positions. For this purpose, the pipes are installed on a support means in a greenhouse, wherein by means of the support means, the pipes between an upper position, in which the pipes are arranged, for example, in a roof space of a greenhouse, and a lower position in which the pipes, for example, below in the greenhouse located gutters for receiving plants are arranged, can be adjusted. In particular, in the upper position, an effective cooling operation can be effected by the pipes are flowed through by a fluid for extracting heat from the greenhouse. In the lower position, however, the pipes can be transferred to a shading of to avoid plants in the greenhouse. The pipelines can be moved, for example, depending on the time of day in the lower position, for example, in the morning at (still) comparatively low incidence of light to avoid shading of the plants. Only later in the day, when the light has become stronger and thus a shading of the plants through the pipes is less detrimental or even negligible, the pipes can then be moved to their upper position to effect cooling during the day temperature of the greenhouse ,

Advantageously, the at least one pipe of the heat exchanger device can also be adjusted in one or more intermediate positions between the upper position and the lower position. For example, at least one middle position may be provided between the upper position and the lower position, which is arranged in a greenhouse above one or more plant gutters of the greenhouse, but below the upper position when the arrangement of the heat exchanger device. In the middle position, the at least one pipeline can thus be arranged, for example, straight at the level of arranged in a plant gutter plants, which is particularly advantageous if the heat exchanger device can be operated instead of the cooling operation in a heat mode for warming the plants, as below should be explained.

In the upper position, the at least one pipe is suspended in an attic of a greenhouse and is thus located above located in the greenhouse plants, so that the at least one pipe can be flowed around by rising warm, moist air. In the lower position, however, is at least one pipe below the plants, for example, in the vicinity of a floor of the greenhouse, wherein a storage device for storing the at least one pipe may be provided in the lower position to the at least one pipe in the lower position in defined position. By means of the storage device, the at least one pipe can be stored in particular so that the at least one pipe for the usual operation of the greenhouse is not a hindrance and can be easily accessed on the plants in the greenhouse. For example, by means of the depositing device, the at least one pipeline can be held in a position to the side of driveways in a greenhouse, so that vehicles used in a greenhouse, For example, a Hubplattformwagen for care and harvesting work, can be moved unhindered along the intended routes.

As will also be explained below, a condensate drainage channel for collecting condensate that drips off the pipeline can be provided on the at least one pipeline. In order to prevent damage to the Kondensatrinne or its suspension to the pipeline when placing the at least one pipe, a bead is advantageously formed in a storage surface of the storage device, in which the Kondensatrinne can be inserted and which receives the Kondensatrinne protective in the stored position.

The support means serves to adjustably suspend the at least one pipeline in a greenhouse. For this purpose, the carrier device can have an adjusting device, for example in the form of an adjusting cable or another suspension means, for adjusting the at least one pipeline between the upper position and the lower position. The adjusting device is preferably suspended on a suitable suspension device, for example in the form of pulleys, on a roof structure of the greenhouse, so adjusted by adjusting the adjusting device along a direction of gravity substantially corresponding to the adjustment at least one pipe between its upper position and its lower position can be.

However, the support means may also be formed as a stand or guide means by means of which the at least one pipe is adjustably mounted on a greenhouse floor or by means of which the at least one pipe in a guided manner, e.g. along suitable, for example, between the greenhouse floor and a roof structure extended guide rails between its upper position and its lower position can be adjusted. The carrier device has a suitable drive device by means of which the at least one pipeline can be lowered from its upper position (in cooperation with gravity) or raised in the direction of the upper position.

In an advantageous embodiment, the heat exchanger device can be operated either in a cooling mode or in a heat mode. In the cooling mode, the heat exchanger device removes heat from the greenhouse, the heat being advantageously stored to thereby gain energy. in the Heat mode, however, gives the heat exchanger device from heat to heat plants located in the greenhouse, for example, previously used for the heat operation and stored heat used and can be discharged again.

In order to operate the heat exchanger device in cooling mode or in heat mode, a suitable fluid, for example water, is passed through the at least one pipeline, wherein in the heat mode a first fluid and in cooling mode a second fluid which differs in temperature from the first fluid, is passed through the at least one pipe. The (second) fluid for the cooling operation in this case preferably has a temperature below the dew point of the ambient air surrounding the pipeline, so that cooling can be achieved by means of the comparatively cool fluid. The (first) fluid for the thermal operation, however, has a comparatively high temperature, in any case a temperature above the temperature of the ambient air, in order to effect a heating of the ambient air.

The first fluid for the thermal operation, for example, have a temperature 80 'Ό. The second fluid for the cooling operation, however, may for example have a temperature of 10 ° C.

In order to operate the heat exchanger device in heat mode or in cooling mode, the at least one pipe is connected for example via suitable flexible hoses to one or more distributors, which are adapted to a first fluid for the thermal operation or a second fluid for the cooling operation through the pipe conduct. By controlling the distributor, the heat exchanger device can thus be operated either in heat mode or in cooling mode.

By using the at least one pipe even for a heat operation can be dispensed with an additional heating in a greenhouse basically.

The distributor may in particular be designed to introduce different fluids into the at least one pipeline in different positions of the at least one pipeline. Thus, the heat exchanger device can be operated, for example in the upper position of the at least one pipe in the cooling mode, so that by flowing through the at least one pipe with a suitable, cooling fluid heat from the at least one pipe flowing around warm, moist air can be withdrawn. In the middle position, in which the at least one pipe is approximated in a plant gutter arranged plants, the heat exchanger means, however, for example, can be operated in heat mode, so that by giving off heat, the plants can be warmed.

For controlling the carrier device for adjusting the at least one pipeline and also for controlling the distributor, a control device is preferably provided which can effect a control, for example, as a function of a temperature characteristic or a light intensity parameter or as a function of time. Thus, for example, at least one sensor device may be provided for detecting at least one temperature characteristic value and / or one light intensity characteristic value which is connected to the control device and the control device controls the carrier device and / or the distributor depending on its sensor data.

Thus, the at least one pipe can be moved, for example, at high temperatures in the upper position to effect cooling of the greenhouse in a cooling operation. At low temperatures, however, the heat exchanger device can be operated in a heat mode.

Additionally or alternatively, the at least one pipe can be moved in response to a measured light intensity in the lower position to avoid shading or in the upper position. For example, if it is determined that the light intensity is low, the at least one pipe can be lowered to the lower position. On the other hand, if the light intensity is so strong that adverse effects due to shadowing by the at least one pipeline in the upper position can be neglected, the at least one pipeline can be raised.

In general, a control can be done depending on the time of day. Thus, the at least one pipeline can be driven early in the morning sun in the lower position to avoid shading in the morning, relatively weak light intensity. If the light intensity then increases during the course of the day and consequently the temperature in the greenhouse increases, then the at least one pipeline can be moved into the upper position in order to effect cooling of the greenhouse. In particular, in cold Au ßentemperaturen, for example, in winter is also conceivable early in the morning to move the at least one pipe in the middle position or the upper position to cause especially in the early morning in a warming operation, a warming of the plants in the greenhouse. This is particularly useful when used in a greenhouse energy umbrellas for energetic foreclosure of an attic of the greenhouse. In winter, when the outside temperature is cold, the air in an attic above the energy shields can cool off considerably. If early in the morning the energy screens are opened, this cold air sinks into the greenhouse. By heating the air, stress effects on the plants can be avoided in such a case.

In cooling operation, a comparatively cool fluid flows through the at least one pipeline, so that cooling of the air is effected by removal of heat from the warm air flowing around the at least one pipeline. Due to the energy transfer from the warm air to the cool fluid, the air is deprived of so-called sensible heat. In addition, it comes on the flowed through by the cool fluid pipe for condensation of the humidity contained in the warm, humid air. This humidity is caused by the transpiration of plants, as a result of which plant leaves cool below the air temperature and thus additionally extract sensible heat from their (comparatively large) leaf areas of the air. By their transpiration, the crops thus support the cooling capacity of the heat exchanger device. By condensing the transpired water of the plant leaves on the at least one pipeline, the air is also deprived of the so-called latent heat.

In order to collect the condensation liquid formed on the at least one pipeline, a condensation channel is preferably arranged on the at least one pipeline. The Kondensatrinne can for example (viewed along the direction of gravity) be arranged below the at least one pipe, so that condensation liquid from the at least one pipe can drip into the Kondensatrinne.

For example, the condensate drain may be in fluid communication with an irrigation system of the greenhouse. The condensation water collected in the condensate can thus be integrated into the irrigation system of the Greenhouse be initiated so that the condensate can be fed back to the irrigation of the plants.

The at least one pipeline of the heat exchanger device is formed, for example, by a spiral ribbed tube, that is, by a tube, on which spiral ribs are arranged. In principle, however, other pipes can be used, for example, so-called Aluflügelrohre or completely differently configured piping. Preference is given to using pipelines which have a comparatively large surface per meter of length in order to be able to ensure efficient heat transfer.

For example, a greenhouse may have at least two energy screens for shielding a roof space of the greenhouse from a plant space below the loft. The energy shields can be adjusted relative to each other to shield the roof space in a closed position and to allow in an open position an exchange of air between the roof space and the plant room and in particular to allow a light incidence on the roof of the greenhouse in the plant room. Especially in cold outside temperatures in winter, the energy shields are closed at night, so that the air temperature in the loft cools down, but at the same time the temperature in the plant room does not drop above the dimensions. In order to prevent in the morning when opening the energy shields that the cold air from the loft on plants located in the plant room plants and causes stress on the plants, it can be provided that the at least one pipe in the upper position in the region of a gap between the at least two energy shields can be driven to heat the cold air that flows through the gap directly before the air hits the plants. The cold air thus flows around the pipe arranged in the region of the gap between the energy shields and is heated there, so that the introduction of the air does not lead to excessive cooling in the plant space of the greenhouse.

The object is also achieved by a method for operating a heat exchanger device for a greenhouse. The heat exchanger device comprises at least one pipeline through which a fluid flows in a cooling operation for removing heat from the greenhouse, and a carrier device for arranging the at least one pipeline in one Glasshouse. It is provided that the carrier device adjusts the at least one pipeline between an upper position and a lower position.

Here, the heat exchanger device, as described above, optionally operated in a heat mode or a cooling operation. In the heat mode, a comparatively warm, first fluid flows through the at least one pipeline, while in the cooling mode a comparatively cool, second fluid is passed through the at least one pipeline. The idea underlying the invention will be explained in more detail with reference to the embodiments illustrated in the figures. 1 shows a schematic representation of a greenhouse with a heat exchange device arranged thereon; a view of a pipeline of a heat exchanger device; a view of the pipe to a support device in a lower position; a schematic view of a pipeline in the region of a gap between two energy shields of the greenhouse; a schematic plan view of a greenhouse with pipes arranged therein of a heat exchanger device; and another schematic view of a greenhouse with piping disposed therein. Fig. 1 shows a schematic view of a greenhouse 1 for growing plants 4. The plants 4 are arranged in a plant room 1 1, above which is a limited by a roof 10 roof space 100. The plants 4 are arranged in plant channels 3 on a floor 12 of the greenhouse 1. The greenhouse 1 is, as is known per se, configured substantially glass, so that light can substantially unimpeded in the greenhouse 1 and irradiate the plants 4. In the greenhouse 1 are several elongated Plant gutters 3, for example, arranged parallel to each other, wherein between the plant channels 3 routes, for example, with parallel to the plant channels 3 extending rails 50 for a vehicle 5, for example, a Hubplattformwagen for harvesting and maintenance work. With the vehicle 5 can be driven along the routes, so that staff at the plants 4 can perform required work.

The greenhouse 1 has a heat exchanger device 2 with a total of three pairs of pipes 20, which are suspended by a carrier device 21 on a support structure 14 above the plant space 1 1 of the greenhouse 1. The pipelines 20 are, as illustrated in FIG. 2, designed as spiral finned tubes with radially extending spiral ribs 200 and extend substantially parallel to the direction of extent of the plant troughs 3. The carrier device 21 has an adjusting device 210 in the form of cables which are attached to a suspension device 21 1 suspended in the form of pulleys on the support structure 14.

By means of the carrier device 21, the pipes 20 can be adjusted between an upper position H2 and a lower position HO. In the upper position H2, the pipes of the support structure 14 and thus the roof space 100 are directly approximated. In the lower position HO, however, are the pipes 20 below the plant channels 3, wherein storage devices 22 are provided for receiving the pipe 20 in the lower position HO to the pipes 20 in the lower position HO side of the routes, especially the side of the Routways arranged rails 50, to be placed so that a vehicle 5 can drive freely from the pipes 20 along the driveways.

In addition, the pipes 20 can be moved to a middle position H1, in which they are arranged above the plant channels 3, but approximately at the level of the plants 4. In principle, the pipelines 20 can each be adjusted differently, wherein it is also conceivable to provide a pairwise adjustment of the pipelines 20, as illustrated in FIG. 1.

The heat exchanger device 2 with its pipes 20 can be operated in a cooling mode or a heat mode. In cooling operation, flows through a comparatively cool fluid, which preferably has a temperature below the dew point of the air in the greenhouse 1, the pipes, wherein in Cooling operation, the pipes 20 are preferably in the upper position H2, so that in the greenhouse 1 rising, warm, moist air, the pipes 20 can flow around. By flowing around the air is withdrawn for a heat. On the other hand, the humidity contained in the air condenses on the pipes 20, so that the air both sensible and latent heat is withdrawn.

In the heat mode, a comparatively warm fluid flows through the pipelines 20. If the pipelines 20 are in the middle position H1, for example, the air in the area of the plants 4 can be heated in this way, with the pipelines 20 for the thermal operation also being in the lower position HO or the upper position H2.

As can be seen from FIG. 2, a condensate channel 201 is arranged beneath the pipeline 20 designed as a spiral ribbed tube, wherein the condensate channel 201 is held by holders 202, for example on a pipe section 203 of the pipeline 20 (a plurality of brackets 202 are spaced along the longitudinal direction of the pipeline 20) provided to each other to hold the Kondensatrinne 201 to the pipeline 20). The Kondensatrinne 201 serves to catch a condensation liquid, which is formed by condensation of the humidity of the pipe 20 flowing around the warm, moist air at the pipe 20 and dripping from the pipe 20. The Kondensatrinne 201 can in this case be slightly inclined along its longitudinal direction and, as illustrated in Fig. 6, via one end the collected condensation liquid to a Kondensatsammeirinne 240 lead, which is connected to an irrigation system 24 of the greenhouse 1, so that the condensation liquid in the Irrigation system 24 introduced and thus the plants 4 can be fed back to irrigation.

The Kondensatrinne 201 is disposed below the pipe 20. Here, in the lower position HO, in which the pipeline 20 is deposited on the depositing device 22, to prevent damage to the Kondensatrinne 201 or the holder 202 may occur, has the storage device 22, as shown in Fig. 3 , On a storage surface 221, on which the pipe 20 is placed in the lower position HO, a bead 220, which is formed in such a manner in the storage surface 221 that when the pipe 20 is laid, the Kondensatrinne 201 comes to rest in the bead 220 and thus is received in a protected manner in the bead 220. As shown schematically in FIG. 5, the conduits 20 are connected to a manifold 23 which can be controlled to pass hot or cool liquid through the conduits 20. The manifold 23 is connected via flexible hoses 23 to the pipes 20, so that the pipes 20 can be adjusted by adjusting the support means 21 relative to the stationary manifold 23.

For controlling the distributor 23 and the carrier device 21, a control device 25 is provided, to which one or more sensor devices in the form of a temperature sensor 250 or a light intensity sensor 251 can be connected, which are shown only schematically in FIG. The control device 25 serves to control the carrier device 21 for adjusting the pipelines 20, for example as a function of a measured temperature value, a measured light intensity value or as a function of the (day) time. The control device 25 also serves to control the distributor 23 in order, for example, to guide different fluids through the pipelines 20 as a function of the position of the pipelines 20.

In the upper position H2, the pipes 20 are in particular when they are to serve in a cooling operation for cooling. In this upper position H2, they are surrounded by warm, moist air, so that by heat extraction, the air can be cooled. In order to avoid shading of the plants 4 located in the plant space 1 1, in particular in the early morning hours, the pipes 20 for cooling can only be moved to the upper position H2 in the morning. This has the advantage that no shading takes place in the morning hours when the intensity of the light increases gradually, cooling in these early morning hours generally not being required anyway. Only when in the later morning, the greenhouse 1 has heated up and the light intensity is so strong that shading by the pipes 20 in the upper position H2 has only a small effect on the plants 4, the pipes 20 are in the upper position H2 then raised to provide for the cooling of the greenhouse 1 in cooling mode.

At night, for example, the pipelines 20 can be moved to the lower position HO in order to provide for the heating of the greenhouse 1 by releasing heat at night. Immediately before sunrise, the pipelines 20 can be moved in this case, for example, in the middle position H1 to provide for a warming of the air directly to the plants 4 and condensation on the plants 4 at Opening of arranged in the greenhouse 1 energy shields 13 to shield the roof space 100 to prevent.

In particularly wet nights, the spiral finned tubes can also be moved into the upper position H2 directly under the energy shields 13 to cause dehumidification of the greenhouse 1 in cooling operation by flowing the pipes 20 with cool fluid.

As already mentioned and as shown in FIG. 1, energy shields 13 are arranged between the roof space 100 of the greenhouse 1 and the plant space 1 1 for the energetic separation of the roof space 100 from the plant space 11, wherein the energy screens 13 are provided, for example, by a suitable cloth material or the like, along an opening direction O, as shown schematically in Fig. 4, can be moved to energetically complete or release the roof space 100. During the day, the energy screens 13 are here in an open position, in which the roof space 100 is not shielded, so that light can enter the plant space 1 1 unhindered. At night, however, especially in winter, the energy shields 13 are closed, so that heat from the plant room 1 1 can not easily get into the roof space 100.

Especially in winter in cold outside temperatures, the air in the roof space 100 cools down strongly at night, which means that when the energy shields 13 are opened, cold air flows into the plant space 11 early in the morning. In order to prevent the cold air from causing stress on the plants 4, the pipelines 20 may be arranged in their upper position H2 just in the region of a gap 130 between two energy shields 13, as illustrated in FIG when the energy screens 13 are opened, cold air flows through the gap 130 and strikes the pipeline 20 arranged in the region of the gap 130, where the cold air is heated. If the cold air has flowed out of the roof space 100, the energy shields 13 can be completely opened.

The idea underlying the invention is not limited to the above-described embodiments, but can in principle be realized even in completely different types of embodiments.

In particular, an adjustment of the pipes can in principle also be made dependent on other criteria. Characterized in that by means of the heat exchanger device, a cooling operation can be provided with closed ventilation, can be enriched in the greenhouse C0 ₂ to increase the rate of photosynthesis of the plants without the initiated C0 ₂ can escape through the ventilation. The fact that condensate formed on the pipes can in turn be introduced into an irrigation cycle, can also reduce the water consumption in a greenhouse facility of the type described here and the water use efficiency can be increased. By virtue of the fact that a heat exchanger device can be operated both in cooling and in heat mode, it is fundamentally possible to dispense with additional heaters at the bottom of a greenhouse, which can reduce the costs for greenhouse operation.

LIST OF REFERENCE NUMBERS

1 greenhouse

10 roof

100 roof room

1 1 plant room

12 floor

13 energy screen

130 gap

14 supporting structure

2 heat exchanger device

20 pipeline

200 spiral ribs

201 Condensate drain

202 bracket

203 pipe section

21 carrier device

210 adjusting device (rope)

21 1 suspension device (pulley)

22 storage device

220 bead

221 storage area

23 distributors

230 hoses

24 irrigation system

240 condensate collection channels

25 control device

250 temperature sensor

251 light intensity sensor

3 plant gutter

4 plants

5 cars

50 rails

HO Lower position

H1 middle position

H2 Upper position O Opening direction V Adjusting direction

Claims

Patent claims

Heat exchanger device for a greenhouse, with

at least one pipe through which a fluid flows in a cooling operation for removing heat from the greenhouse, and a support device for arranging the at least one pipe in a greenhouse, characterized in that the support device (21) for adjusting the at least one pipe ( 20) is designed such that the at least one pipeline (20) is adjustable between an upper position (h2) and a lower position (HO).

Heat exchanger device according to claim 1, characterized in that the upper position (H2) is approximated to a roof (10) of the greenhouse (1) when the heat exchanger device (2) is arranged as intended in a greenhouse (1).

Heat exchanger device according to claim 1 or 2, characterized in that the lower position (HO) when the heat exchanger device is arranged as intended

(2) in a greenhouse (1) below a plant gutter

(3), in which plants (4) are to be arranged, is arranged.

4. Heat exchanger device according to one of claims 1 to 3, characterized in that the at least one pipe (20) has at least one middle position (H1) between the upper position (H2) and the lower position (HO), the middle position ( H1) is arranged above a plant trough (3) of the greenhouse (1) when the heat exchanger device (2) is arranged as intended in a greenhouse (1).

Heat exchanger device according to one of the preceding claims, characterized by a storage device (22) for storing the at least one pipe (20) in the lower position (HO).

Heat exchanger device according to claim 5, characterized in that the storage device (22) has a storage surface (221) for storing the at least one pipe (20) and at least one bead formed in the storage surface (221) for receiving a on the at least one pipe (20). arranged condensate trough (201).

Heat exchanger device according to one of the preceding claims, characterized in that the carrier device (21) has an adjusting device (210) for adjusting the at least one pipe (20) between the upper position and the lower position, the at least one pipe (20) being over the Adjusting device (210) is suspended on a suspension device (21 1) and is adjustable by adjusting the adjusting device (210) along an adjustment direction (V) to the suspension device (21 1).

Heat exchanger device according to one of the preceding claims, characterized in that the heat exchanger device (2) has a distributor (23) to which the at least one pipe (20) is connected, the distributor (23) being designed to contain a first fluid for heating operation or to direct a second fluid, which differs in temperature from the first fluid, into the at least one pipeline (20) for a cooling operation.

Heat exchanger device according to claim 8, characterized in that the second fluid for cooling operation has a temperature below the dew point of the ambient air surrounding the pipeline (20).

10. Heat exchanger device according to claim 8 or 9, characterized in that the distributor (23) is designed to introduce different fluids into the at least one pipe (20) in different positions of the at least one pipe (20).

1 1 . Heat exchanger device according to one of the preceding claims, characterized by a control device (25) for controlling the carrier device (21) as a function of at least one temperature characteristic, a light intensity characteristic or time.

12. Heat exchanger device according to one of the preceding claims, characterized by at least one sensor device (250, 251) for detecting at least one temperature characteristic value and / or a light intensity characteristic value.

13. Heat exchanger device according to one of the preceding claims, characterized in that on the at least one pipe (20) there is a condensate trough (201) for receiving one on the at least one

Pipe (20) resulting condensation liquid is arranged.

14. Heat exchanger device according to claim 13, characterized in that the condensate trough (201) is in flow connection with an irrigation system (24) of the greenhouse (1) and is designed to introduce condensation liquid entering the condensate trough (201) into the irrigation system (24).

15. Heat exchanger device according to one of the preceding claims, characterized in that the at least one pipe (20) is formed by at least one spiral finned tube.

16. Greenhouse with a heat exchanger device according to one of the preceding claims.

17. Greenhouse according to claim 16, characterized in that the greenhouse (1) has at least two energy screens (13) for shielding a roof space (100) of the greenhouse (1), wherein the at least one

Pipe (20) of the heat exchanger device (2) can be arranged in the upper position (H2) in the area of a gap (130) between the at least two energy shields (13).

18. Method for operating a heat exchanger device for a greenhouse, wherein the heat exchanger device

at least one pipeline through which a fluid flows in a cooling operation for removing heat from the greenhouse, and a support device for arranging the at least one pipeline in a greenhouse

has, characterized in that the carrier device (21) adjusts the at least one pipeline (20) between an upper position (H2) and a lower position (HO).

Method according to claim 18, characterized in that in a heating operation a first fluid and in a cooling operation a second fluid, which differs in temperature from the first fluid, is passed through the at least one pipe (20).