A greenhouse for cultivating plants and a method for climate control in the greenhouse

Abstract

A greenhouse for cultivating plants in an interior space thereof, comprising: - an air ventilation system provided with an inlet channel for providing air into the interior space and an outlet channel for exhausting air from the interior space; - a first heat exchanger arranged for exchanging heat, in use, between the inlet channel and the outlet channel; and - a heat pump system arranged for providing and / or extracting heat at a first position in the inlet channel between an inlet of the inlet channel and the first heat exchanger; - a control unit, communicatively coupled to the heat pump system, arranged for controlling the heat pump system. A method for climate control in a greenhouse.

Description

[0001] Title: A greenhouse for cultivating plants and a method for climate control in the greenhouse

[0002] Description:

[0003] According to a first aspect, the present disclosure relates to a greenhouse for cultivating plants in an interior space thereof, comprising: an air ventilation system provided with an inlet channel for providing air into the interior space and an outlet channel for exhausting air from the interior space; a first heat exchanger arranged for exchanging heat, in use, between the inlet channel and the outlet channel.

[0004] According to a second aspect, the present disclosure relates to a method for climate control in the greenhouse according to any one of the preceding claims, the method comprising the steps of: providing, by the air ventilation system, air into the interior space; exhausting, by the air ventilation system, air from the interior space; exchanging heat, by the first heat exchanger, between the inlet channel and the outlet channel.

[0005] A drawback of a known greenhouse and method is that a relative large amount of energy is required for maintaining a predetermined relative humidity and temperature in the interior space while providing the interior space with fresh air.

[0006] The objective of the present disclosure is to provide a greenhouse and a method that allow to maintain a predetermined relative humidity and temperature in the interior space while providing the interior space with fresh air using a relative low amount of energy.

[0007] The objective is achieved by the greenhouse according to the first aspect of the present disclosure by providing the greenhouse with: a heat pump system arranged for providing and / or extracting heat at a first position in the inlet channel between an inlet of the inlet channel and the first heat exchanger; a control unit, communicatively coupled to the heat pump system, arranged for controlling the heat pump system.

[0008] The present disclosure relies at least partly on the insight that is relatively attractive to remove moisture from air through condensation at a relative low temperature as compared to removing moisture from air having a relative high temperature.

[0009] In addition, it is known to be beneficial for reasons of energy efficiency to provide a heat exchanger for exchanging heat between air exhausted from the interior space and fresh air that is to be provided into the interior space of the greenhouse.

[0010] A known greenhouse draws in air from outside the greenhouse having the actual ambient temperature. In particular when the temperature difference between the ambient temperature and the air exhausted from the interior space is relatively small, the efficiency of the heat exchange cycle as well as removal of moisture, dehumidification, is relatively low or even ineffective. By arranging the heat pump in accordance with the present disclosure a relative large temperature difference may be obtained between the inlet channel and the outlet channel thereby allowing to realize a relative efficient heath exchange as well as removal of moisture.

[0011] The present disclosure, further relies at least partly on the insight that at relative low ambient temperature, for instance below the freezing point of water, the moisture in the air may solidify in the heat exchanger and thereby reducing or even blocking the flow of air in the inlet channel.

[0012] By providing the heat pump system and the control unit, the temperature of the air provided to the first heat exchanger, via the inlet channel, may be controlled thereby avoiding, or at least reducing the risk, of at least one of the identified issues with the known greenhouse.

[0013] Preferably, the an air ventilation system provided with an inlet channel for providing air from outside the greenhouse into the interior space and an outlet channel for exhausting air from the greenhouse originating from the interior space. Preferably, the first heat exchanger is a counter-flow heat exchanger.

[0014] It is advantageous if the greenhouse further comprises a first detection unit arranged for detecting a temperature in the inlet channel at a second position in the inlet channel between the inlet of the inlet channel and the first position in the inlet channel. Providing the first detection unit at the second position in the inlet channel is beneficial for enabling to detect the temperature at that location before the air in the inlet channel passes the first heat exchanger.

[0015] In this regard, it is beneficial if the first detection unit is arranged for detecting the temperature of air in the inlet channel at the second position. Arranging the first detection unit for detecting the temperature of air in the inlet channel is beneficial for enabling a control of the heat pump system based on the air temperature itself thereby allowing a more rapid response to changes in the ambient air temperature.

[0016] In a practical embodiment of the greenhouse, the control unit is communicatively coupled to the first detection unit and arranged for controlling the heat pump system taking into account the temperature detected by the first detection unit. This is beneficial for allowing to maintain a predetermined relative humidity and temperature in the interior space while providing the interior space with fresh air from outside the greenhouse using a relative low amount of energy

[0017] In this regard, it is advantageous if the control unit is arranged for determining that the temperature detected by the first detection unit is below a first predetermhed temperature and arranged for controlling the heat pump system for providing heat at the first position in the inlet channel upon determining that the temperature detected by the first detection unit is below the first predetermined temperature. Providing heat at the first position in the inlet channel may be beneficial for avoiding a temperature that is considered too low for an energy efficient operation of the greenhouse. In particular, when the first predetermined temperature corresponds to the freezing point of water, solidification of the moisture in the air drawn in the greenhouse, via the inlet channel, in the heat exchanger may be prevented, or at least significantly reduced. Within the context of the present disclosure the wording “upon determining” is to be understood as “triggered by” to imply a coupled relation between the controlling of the control unit and the determining by the control unit.

[0018] It is advantageous, if the greenhouse further comprises a second detection unit arranged for measuring a temperature, preferably a temperature of air, in the outlet channel at a first position in the outlet channel between an inlet of the outlet channel and the first heat exchanger, wherein the control unit is further communicatively coupled to the second detection unit and arranged for controlling the heat pump system taking into account a difference between the temperature detected by the first detection unit and the temperature detected by the second detection unit.

[0019] Providing the second detection unit at the first position in the outlet channel is beneficial for enabling to detect the temperature at that location before the air in the outlet channel passes the first heat exchanger.

[0020] In this regard, it is beneficial if the second detection unit is arranged for detecting the temperature of air in the outlet channel at the first position in the outlet channel. Arranging the second detection unit for detecting the temperature of air in the outlet channel is beneficial for enabling a control of the heat pump system based on the air temperature itself thereby allowing a more rapid response to changes in the air temperature.

[0021] Preferably, the control unit is arranged for controlling the heat pump system such that a temperature difference between the outlet channel, at a position between an inlet of the outlet channel and the first heat exchanger, and the inlet channel, between the first position in the inlet channel and the first heat exchanger, exceeds a predetermined temperature difference or is equal to a predetermined temperature difference. This is beneficial for realizing a relative efficient heat exchange by the first heat exchanger. Moreover, by providing the heat pump at the first position a temperature difference of the air provided to the heat pump in the inlet channel and the outlet channel is relatively large thereby allowing the heat pump to extract energy relative efficiently. Preferably, the control unit is arranged for determining that the difference between the temperature detected by the first detection unit and the temperature detected by the second detection unit is smaller than a first predetermined temperature difference and arranged for controlling the heat pump system for extracting heat at the first position in the inlet channel upon determining that the difference between the temperature detected by the first detection unit and the temperature detected by the second detection unit is smaller than the first predetermined temperature difference. This is beneficial for maintaining a temperature difference between the first position in the outlet channel and the second position in the inlet channel that is larger than the first predetermined temperature difference

[0022] In this regard, it is beneficial if the heat pump system comprises: a compressor arranged for increasing a pressure of a refrigerant; a heat-source-side heat exchanger configured to cause heat exchange between the refrigerant flowing therein and a first fluid passing therethrough; a utilization-side heat exchanger configured to cause heat exchange between refrigerant flowing therein and a second fluid passing therethrough; a high-pressure refrigerant pipe connected to each of a discharge port of the compressor and the utilization-side heat exchanger; a low-pressure refrigerant pipe connected to each of the heat-source-side heat exchanger and a suction port of the compressor; a liquid refrigerant pipe connected to each of the heat-source-side heat exchanger and the utilization-side heat exchanger; a pressure decreasing device arranged for decreasing the pressure of the refrigerant disposed in the liquid refrigerant pipe; wherein the greenhouse further comprises: a receiving system connected for fluid flow with the utilization-side heat exchanger for receiving the first fluid from the heat pump system.

[0023] Providing the heat pump system with the receiving system is beneficial for maintain a predetermined relative humidity and temperature in the interior space while providing the interior space with fresh air from outside the greenhouse using a relative low amount of energy by utilizing the heat produced by the heat pump system in a receiving system.

[0024] In an embodiment, the receiving system may for instance comprise a water circulation system arranged for circulating water at temperatures elevated above the temperature of the air in the interior space.

[0025] In a practical embodiment of the greenhouse according to the first aspect of the present disclosure, the greenhouse comprises: a return channel coupled for fluid flow with the outlet channel at a second position between an outlet of the outlet channel and the first heat exchanger and with the inlet channel at a third position between the inlet of the inlet channel and the second position in the inlet channel;

[0026] - a third detection unit arranged for measuring a temperature, preferably a temperature of air, in the outlet channel at a third position in the outlet channel between the second position in the outlet channel and the first heat exchanger;

[0027] - a fourth detection unit arranged for measuring a temperature, preferably a temperature of air, in the inlet channel at a fourth position in the inlet channel between the inlet of the inlet channel and the third position in the inlet channel; a first valve arrangement arranged for allowing fluid flow, via the return channel, in a first state of the first valve arrangement, from the outlet channel to the inlet channel and blocking fluid flow, via the return channel, in the second state of the first valve arrangement, from the outlet channel to the inlet channel; wherein the control unit is further communicatively coupled to the third detection unit, the fourth detection unit and the first valve arrangement and arranged for determining that the temperature detected by the third detection unit is higher than the temperature detected by the fourth detection unit and that the temperature detected by the fourth detection unit is below a second predetermined temperature and arranged for bringing the first valve arrangement in the first state upon determining that the temperature detected by the third detection unit is higher than the temperature detected by the fourth detection unit and that the temperature detected by the fourth detection unit is below the second predetermined temperature. In an advantageous embodiment, the greenhouse is provided with a cultivation gutter for cultivating plants thereon, wherein the air outlet of the inlet channel is provided near the cultivation gutter.

[0028] In an embodiment of the greenhouse, the greenhouse comprises an air pipe connected for fluid flow with the inlet channel, wherein the air pipe extends near a floor surface of the greenhouse. Usually the plants are cultivated in a lower part of the interior, so that supplying air to the lower part of the interior will be beneficial to the plants to be cultivated.

[0029] In one embodiment of the greenhouse, the greenhouse is provided with a plurality of parallel cultivation gutters for cultivating the plants and a plurality of the air pipes, each arranged beneath and parallel to a respective one of the plurality of cultivation gutters. This is advantageous for supplying air to a lower part of the interior in a relatively uniform manner over said lower part.

[0030] Preferably, the greenhouse comprises a first pressure device arranged for forcing air through the inlet channel.

[0031] Preferably, the greenhouse comprises a second pressure device arranged for forcing air through the outlet channel.

[0032] In a practical embodiment of the greenhouse according to the present disclosure, the inlet of the inlet channel is directly connected for fluid flow with the outlet of the outlet channel. This is beneficial for maintaining a predetermined relative humidity and temperature in the interior space using a relative low amount of energy.

[0033] In this regard, it is beneficial if the ventilation system comprises a housing housing the utilization-side heat exchanger and / or the heat-source side heat exchanger.

[0034] Preferably, the housing is provided with a drain for draining the moisture from the ventilation system. According to the second aspect, the present disclosure relates to a method for climate control in the greenhouse according to the first aspect of the present disclosure comprising the steps of: providing, by the air ventilation system, air into the interior space; exhausting, by the air ventilation system, air from the interior space; exchanging heat, by the first heat exchanger, between the inlet channel and the outlet channel; providing or extracting heat, by the heat pump system, at the first position in the inlet channel; and controlling, by the control unit, the heat pump system.

[0035] Embodiments of the greenhouse according to the first aspect of the present disclosure as presented previously are also applicable to the method according to the second aspect of the present disclosure, and vice versa.

[0036] Effects of the greenhouse according to the first aspect of the present disclosure as presented above correspond to or are similar to effects of the method according to the second aspect of the present disclosure.

[0037] In an embodiment, during the step of providing, by the air ventilation system, air from outside the greenhouse is provided into the interior space.

[0038] In an embodiment, during the step of exhausting, by the air ventilation system, air originating from the interior space is exhausted from the greenhouse.

[0039] In an embodiment, the method comprises the step of determining, by the first detection unit, the temperature, preferably the temperature of air, in the inlet channel at the second position in the inlet channel between the inlet of the inlet channel and the first position in the inlet channel.

[0040] In this regard, it is beneficial if, during the step of controlling, the control unit controls the heat pump system taking into account the temperature detected by the first detection unit. Preferably, the method further comprises the step of determining, by the control unit, that the temperature detected by the first detection unit is below a first predetermined temperature, wherein, during the step of controlling, the control unit controls the heat pump system for providing heat at the first position in the inlet channel.

[0041] It is advantageous if the method further comprises the step of detecting, by the second detection unit, the temperature, preferably the temperature of air, in the outlet channel at the first position in the outlet channel between the inlet of the outlet channel and the first heat exchanger, wherein, during the step of controlling, the control unit controls the heat pump system taking into account a difference between the temperature detected by the first detection unit and the temperature detected by the second detection unit.

[0042] In this regard, it is beneficial if the method comprises the step of determining, by the control unit, that the difference between the temperature detected by the first detection unit and the temperature detected by the second detection unit is smaller than the first predetermined temperature difference, wherein, during the step of controlling, the control unit controls the heat pump system for extracting heat at the first position in the inlet channel.

[0043] Preferably, the method further comprises the steps of: detecting, by the third detection unit, the temperature, preferably the temperature of air, in the outlet channel at the second position in the outlet channel between the outlet of the outlet channel and the first heat exchanger; determining, by the control unit, that the temperature detected by the third detection unit is higher than the temperature detected by the first detection unit and that the temperature detected by the first detection unit is below a second predetermined temperature; wherein the control unit controls the first valve arrangement for bringing the first valve arrangement in the first state.

[0044] The present disclosure will now be explained by means of a description of embodiments of a greenhouse for cultivating plants according to the present disclosure, in which reference is made to the following schematic figures, in which:

[0045] Fig. 1A: a top view of a greenhouse for cultivating plants according to the present disclosure is shown;

[0046] Fig. 1B: a side view of the greenhouse for cultivating plants according to the present disclosure is shown;

[0047] Fig. 2: a flowchart of the greenhouse for cultivating plants according to the present disclosure is shown;

[0048] Fig. 3: a flowchart of the heat pump system according to the present disclosure is shown;

[0049] Fig. 4: a flowchart of a method for climate control in a greenhouse according to the present disclosure is shown;

[0050] Fig. 5: a flowchart of another method for climate control in a greenhouse according to the present disclosure is shown;

[0051] Fig. 6: a flowchart of another greenhouse for cultivating plants according to the present disclosure is shown.

[0052] Fig. 1A shows a top view of a greenhouse 101 for cultivating plants 55 in an interior space 3 according to the present disclosure. The greenhouse 101 is provided with an air ventilation system 5 provided with an inlet channel 7 for providing air from outside the greenhouse 101 into the interior space 3 and an outlet channel 9 for exhausting air from the greenhouse 101 originating from the interior space 3. The inlet channel 7 has an inlet 14 and an outlet 22 and the outlet channel 9 has an inlet 20 and an outlet 48. The greenhouse 101 further comprises a first heat exchanger 11 arranged for exchanging heat, in use, between the inlet channel 7 and the outlet channel 9, a heat pump system 13 arranged for providing and / or extracting heat at a first position in the inlet channel 7 between the inlet 14 of the inlet channel 7 and the first heat exchanged 1 , and a control unit 15 that is communicatively coupled to the heat pump system 13 (indicated with a dotted line between the control unit 15 and the heat pump system 13), arranged for controlling the heat pump system 13.

[0053] A side view of the greenhouse 101 for cultivating plants 55 according to the present disclosure is shown in Fig. 1B. Air enters the interior space 3 via the inlet channel 7, having inlet 14 (not visible in this side view), and air flows via the air pipe 59 from the lower part to the higher part of the interior between the plants 55, as indicated by arrows, and then circulates in the interior space 3. (Part of) the air exits the interior space 3 via the inlet 20 of the outlet channel 9 and exits the greenhouse 1 via outlet 48 of the outlet channel 9.

[0054] The greenhouse 101 may be provided with a plurality of parallel cultivation gutters 57 for cultivating the plants 55 and a plurality of the air pipes 59, each arranged beneath and parallel to a respective one of the plurality of cultivation gutters 57.

[0055] Furthermore, the greenhouse 101 may comprise an air pipe 59 connected for fluid flow with the inlet channel 7, wherein the air pipe 59 extends near a floor surface 61 of the greenhouse 101.

[0056] The greenhouse 101 may comprise a first pressure device 63 arranged for forcing air through the inlet channel 7 and the greenhouse 101 may also comprise a second pressure device 65 arranged for forcing air through the outlet channel 9.

[0057] A flowchart of the greenhouse 101 according to the present disclosure is shown in Fig. 3. The greenhouse 101 comprises the air ventilation system 5 provided with the inlet channel 7 having an inlet 14. Air enters the inlet channel 7 and flows through the inlet channel 7 via the heat pump system 13 to the heat exchanger 11 before it enters the interior space 3 of the greenhouse 101.

[0058] The greenhouse 101 may further comprise a first detection unit 17. The first detection unit 17 is arranged for detecting a temperature, preferably a temperature of air, in the inlet channel 7 at a second position in the inlet channel 7 between the inlet 14 of the inlet channel 7 and the first position in the inlet channel 7. The first detection unit 17 is communicatively coupled with the control unit 15 (indicated with a dotted line between the first detection unit 17 and the control unit 15).

[0059] The greenhouse 101 may further comprise a second detection unit 19. The second detection unit 19 is arranged for measuring a temperature, preferably a temperature of air, in the outlet channel 9 at a first position in the outlet channel 9 between an inlet 20 of the outlet channel 9 and the first heat exchanger 11. The second detection unit 19 is communicatively coupled with the control unit 15 (indicated with a dotted line between the second detection unit 19 and the control unit 15).

[0060] The greenhouse 101 may further comprise a return channel 47 coupled for fluid flow with the outlet channel 9 at a second position between the outlet 48 of the outlet channel 9 and the first heat exchanger 11 and with the inlet channel 7 at a third position between the inlet 14 of the inlet channel 7 and the first detection unit 17 positioned at the second position in the inlet channel 7. A first valve arrangement 53 may be positioned in the return channel 47 and is arranged for allowing fluid flow, via the return channel 47, in a first state of the first valve arrangement 53, from the outlet channel 9 to the inlet channel 7 and blocking fluid flow, via the return channel 47, in the second state of the first valve arrangement 53, from the outlet channel 9 to the inlet channel 7. The first valve arrangement 53 is communicatively coupled with the control unit 15 (indicated with a dotted line between the first valve arrangement 53 and the control unit 15).

[0061] Furthermore, the greenhouse 101 may comprise a third detection unit 49 and a fourth detection unit 51. The third detection unit 49 is arranged for measuring a temperature, preferably a temperature of air, in the outlet channel 9 at a third position in the outlet channel 9 between the second position of the outlet channel 9 and the first heat exchanger 11. The fourth detection unit 51 is arranged for measuring a temperature, preferably a temperature of air, in the inlet channel 7 at a fourth position in the inlet channel 7 between the inlet 14 of the inlet channel 7 and the third position in the inlet channel 7. Both the third detection unit 49 and the fourth detection unit 51 are communicatively coupled with the control unit 15 (indicated with dotted lines between the third detection unit 49 and the control unit 15 and between the fourth detection unit 51 and the control unit 15, respectively).

[0062] Fig. 3 shows a flowchart of the heat pump system 13 according to the present disclosure. The heat pump system 13 comprises a compressor 21 arranged for increasing a pressure of a refrigerant, a heat-source-side heat exchanger 25 configured to cause heat exchange between the refrigerant flowing therein and a first fluid 27 passing therethrough, and a utilization-side heat exchanger 29 configured to cause heat exchange between refrigerant flowing therein and a second fluid 31 passing therethrough.

[0063] The heat pump system 13 also comprises a high-pressure refrigerant pipe 33 connected to each of a discharge port 35 of the compressor 21 and the utilization-side heat exchanger 29, a low-pressure refrigerant pipe 37 connected to each of the heat- source-side heat exchanger 25 and a suction port 39 of the compressor 21, and a liquid refrigerant pipe 41 connected to each of the heat-source-side heat exchanger 25 and the utilization-side heat exchanger 29.

[0064] Furthermore, the heat pump system 13 comprises a pressure decreasing device 43 arranged for decreasing the pressure of the refrigerant disposed in the liquid refrigerant pipe 41, and a receiving system 45 connected for fluid flow with the utilization-side heat exchanger 29 for receiving the first fluid 31 from the heat pump system 13.

[0065] Fig. 4 and Fig. 5 each show a flow diagram of respective methods 201,202 for climate control in the greenhouse 101 according to the present disclosure. Methods 201,202 comprise the step of providing 203, by the air ventilation system 5, from outside the greenhouse 101 , into the interior space 3. The step of exhausting 205, by the air ventilation system 5, air from the greenhouse 101 originating from the interior space 3, the step of exchanging heat 207, by the first heat exchanger 11, between the inlet channel 7 and the outlet channel 9, the step of providing or extracting heat 209, by the heat pump system 13, at the first position in the inlet channel 7, and the step of controlling 211, by the control unit 15, the heat pump system 13.

[0066] Both methods 201 ,202 further comprise the step of determining 213, by the first detection unit 17, the temperature, preferably the temperature of air, in the inlet channel 7 at the second position in the inlet channel 7 between the inlet 14 of the inlet channel 7 and the first position in the inlet channel 7.

[0067] Method 201 further comprises the step of determining 215, by the control unit 15, that the temperature detected by the f irst detection unit 17 is below a first predetermined temperature, the step of detecting 217, by the second detection unit 19, the temperature, preferably the temperature of air, in the outlet channel 9 at the first position in the outlet channel 9 between the inlet 20 of the outlet channel 9 and the first heat exchanger 11, and the step of determining 219, by the control unit 15, that the difference between the temperature detected by the first detection unit 15 and the temperature detected by the second detection unit 19 is smaller than a first predetermined temperature difference.

[0068] Method 202 further comprises the step of detecting 221, by the third detection unit 49, the temperature, preferably the temperature of air, in the outlet channel 9 at the second position in the outlet channel 9 between the outlet 48 of the outlet channel 9 and the first heat exchanger 11, and the step of determining 223, by the control unit 15, that the temperature detected by the third detection unit 49 is higher than the temperature detected by the first detection unit 17 and that the temperature detected by the first detection unit 17 is below a second predetermined temperature.

[0069] The greenhouse 301 differs mainly from the greenhouse 101 in that the inlet 14 of the inlet channel 7 is directly connected for fluid flow with the outlet 48 of the outlet channel 9. This is beneficial for removing moisture from air originating from the interior space 3 in a relative energy efficient manner. Elements of greenhouse 301 that are identical or similar to elements of greenhouse 101 are provided with identical reference numerals. The first heat exchanger 11 is a counter-flow heat exchanger.

[0070] The ventilation system 5 comprises a housing 303 housing the utilization- side heat exchanger and / or the heat-source-side heat exchanger. The housing 303 is provided with a drain 305 for draining moisture from the ventilation system 5.

[0071] The greenhouse 301 may further be provided with elements of greenhouse 101 that are identified for greenhouse 101 but not identified in Fig. 6 for greenhouse 301 , such as the detection units 17 and 19.

Claims

CLAIMS1. A greenhouse (101 , 301) for cultivating plants (55) in an interior space (3) thereof, comprising:5 - an air ventilation system (5) provided with an inlet channel (7) for providing air, into the interior space (3) and an outlet channel (9) for exhausting air from the interior space (3); a first heat exchanger (11) arranged for exchanging heat, in use, between the inlet channel (7) and the outlet channel (9); and 0 a heat pump system (13) arranged for providing and / or extracting heat at a first position in the inlet channel (7) between an inlet (14) of the inlet channel (7) and the first heat exchanger (11); a control unit (15), communicatively coupled to the heat pump system (13), arranged for controlling the heat pump system (13).

52. The greenhouse (101, 301) according to claim 1, wherein the control unit (15) is further arranged for controlling the heat pump system (13) such that a temperature difference between the outlet channel (9), at a position between an inlet (20) of the outlet channel (9) and the first heat exchanger (11), and the inlet0 channel (7), at a position between the first position in the inlet channel (7) and the first heat exchanger (11), exceeds a predetermined temperature difference or is equal to a predetermined temperature difference.

3. The greenhouse (101 , 301) according to claim 1 or 2, wherein the greenhouse5 further comprises:- a first detection unit (17) arranged for detecting a temperature, preferably a temperature of air, in the inlet channel (7) at a second position in the inlet channel (7) between the inlet (14) of the inlet channel (7) and the first position in the inlet channel (7).

04. The greenhouse (101, 301) according to claim 2, wherein the control unit (15) is communicatively coupled to the first detection unit (17) and arranged for controlling the heat pump system (13) taking into account the temperature detected by the first detection unit (17) .

5. The greenhouse (101, 301) according to claim 4, wherein the control unit (15) is arranged for determining that the temperature detected by the first detection unit (17) is below a first predetermined temperature and arranged for controlling the heat pump system (13) for providing heat at the first position in the inlet channel (7) upon determining that the temperature detected by the first detection unit (17) is below the first predetermined temperature.

6. The greenhouse (101, 301) according to claim 2, 3, 4 or 5, wherein the greenhouse (101, 301) further comprises: a second detection unit (19) arranged for measuring a temperature, preferably a temperature of air, in the outlet channel (9) at a first position in the outlet channel (9) between the inlet (20) of the outlet channel (9) and the first heat exchanger (11); wherein the control unit (15) is further communicatively coupled to the second detection unit (19) and arranged for controlling the heat pump system (13) taking into account a difference between the temperature detected by the first detection unit (17) and the temperature detected by the second detection unit (19).

7. The greenhouse (101, 301) according to claim 6, wherein the control unit (15) is arranged for determining that the difference between the temperature detected by the first detection unit (17) and the temperature detected by the second detection unit (19) is smaller than a first predetermined temperature difference and arranged for controlling the heat pump system (13) for extracting heat at the first position in the inlet channel (7) upon determining that the difference between the temperature detected by the first detection unit (17) and the temperature detected by the second detection unit (19) is smaller than the first predetermined temperature difference.

8. The greenhouse (101 , 301) according to claim 7, wherein the heat pump system (13) comprises: a compressor (21) arranged for increasing a pressure of a refrigerant; a heat-source-side heat exchanger (25) configured to cause heat exchange between the refrigerant flowing therein and a first fluid (27) passing therethrough; a utilization-side heat exchanger (29) configured to cause heat exchange between refrigerant flowing therein and a second fluid (31) passing therethrough;a high-pressure refrigerant pipe (33) connected to each of a discharge port (35) of the compressor (21) and the utilization-side heat exchanger (29); a low-pressure refrigerant pipe (37) connected to each of the heat-source- side heat exchanger (25) and a suction port (39) of the compressor (21); a liquid refrigerant pipe (41) connected to each of the heat-source-side heat exchanger (25) and the utilization-side heat exchanger (29); a pressure decreasing device (43) arranged for decreasing the pressure of the refrigerant disposed in the liquid refrigerant pipe (41); wherein the greenhouse (101 , 301) further comprises: a receiving system (45) connected for fluid flow with the utilization-side heat exchanger (29) for receiving the first fluid (27) from the heat pump system (13).

9. The greenhouse (101 , 301) according to claim 8, wherein the receiving system comprises a water circulation system arranged for circulating water at temperatures elevated above the temperature of air in the interior space (3).

10. The greenhouse (101 , 301) according to claim 3 or a claim dependent thereof , wherein the greenhouse (101 , 301) further comprises: a return channel (47) coupled for fluid flow with the outlet channel (9) at a second position between an outlet (48) of the outlet channel (9) and the first heat exchanger (11) and with the inlet channel (7) at a third position between the inlet (14) of the inlet channel (7) and the second position in the inlet channel (7);- a third detection unit (49) arranged for measuring a temperature, preferably a temperature of air, in the outlet channel (9) at a third position in the outlet channel (9) between the second position in the outlet channel (9) and the first heat exchanger (11);- a fourth detection unit (51) arranged for measuring a temperature, preferably a temperature of air, in the inlet channel (7) at a fourth position in the inlet channel (7) between the inlet (14) of the inlet channel (7) and the third position in the inlet channel (7); a first valve arrangement (53) arranged for allowing fluid flow, via the return channel (47), in a first state of the first valve arrangement (53), from the outlet channel (9) to the inlet channel (7) and blocking fluid flow, via the return channel (47), in the second state of the first valve arrangement (53), from the outlet channel (9) tothe inlet channel (7); wherein the control unit (15) is further communicatively coupled to the third detection unit (49), the fourth detection unit (51) and the first valve arrangement (53) and arranged for determining that the temperature detected by the third detection unit (49) is higher than the temperature detected by the fourth detection unit (51) and that the temperature detected by the fourth detection unit (51) is below a second predetermined temperature and arranged for bringing the first valve arrangement (53) in the first state upon determining that the temperature detected by the third detection unit (49) is higher than the temperature detected by the fourth detection unit (51) and that the temperature detected by the fourth detection unit (51) is below the second predetermined temperature.

11. The greenhouse (301) according to any one of the claims 1 to 9, wherein the inlet (14) of the inlet channel (7) is directly connected for fluid flow with an outlet (48) of the outlet channel (9).

12. The greenhouse (301) according to claim 9 and 11, wherein the ventilation system (5) comprises a housing (303) housing the utilization-side heat exchanger and / or the heat-source side heat exchanger.

13. The greenhouse (301) according to claim 12, wherein the housing (303) is provided with a drain (305) for draining the moisture from the ventilation system (5).

14. A method (201 , 202) for climate control in the greenhouse (101 , 301) according to any one of the preceding claims, the method (201, 202) comprising the steps of: providing (203), by the air ventilation system (5), air into the interior space (3); exhausting (205), by the air ventilation system (5), air from the interior space (3); exchanging heat (207), by the first heat exchanger (11), between the inlet channel (7) and the outlet channel (9); providing or extracting heat (209), by the heat pump system (13), at the first position in the inlet channel (7); and controlling (211), by the control unit (15), the heat pump system (13).

15. The method (201 , 202) according to claim 14 using the greenhouse (101, 301) according to claim 2, wherein the method (201 , 202) comprises the step of: determining (213), by the first detection unit (17), the temperature, preferably the temperature of air, in the inlet channel (7) at the second position in the inlet channel (7) between the inlet (14) of the inlet channel (7) and the first position in the inlet channel (7).

16. The method (201 , 202) according to claim 15 using the greenhouse (101 , 15 301) according to claim 3, wherein, during the step of controlling, the control unit (15) controls the heat pump system (13) taking into account the temperature detected by the first detection unit (17).

17. The method (201 , 202) according to claim 16 using the greenhouse (101, 301) according to claim 4, wherein the method (201 , 202) further comprises the step of: determining (215), by the control unit (15), that the temperature detected by the first detection unit (17) is below a first predetermined temperature; wherein, during the step of controlling, the control unit (15) controls the heat pump system (13) for providing heat at the first position in the inlet channel (7).

18. The method (201, 202) according to any one of the claims 15, 16 and 17, wherein the method (201, 202) further comprises the step of: detecting (217), by the second detection unit (19), the temperature, preferably the temperature of air, in the outlet channel (9) at the first position in the outlet channel (9) between the inlet (20) of the outlet channel (9) and the first heat exchanger (11); and wherein, during the step of controlling, the control unit (15) controls the heat pump system (13) taking into account a difference between the temperature detected by the first detection unit (17) and the temperature detected by the second detection unit (19).

19. The method (201, 202) according to claim 18, using the greenhouse (101, 301) according to claim 6, wherein the method (201, 202) comprises the step of:- determining (219), by the control unit (15), that the difference between the temperature detected by the first detection unit (17) and the temperature detected by the second detection unit (19) is smaller than the first predetermined temperature difference; wherein, during the step of controlling, the control unit (15) controls the heat pump system (13) for extracting heat at the first position in the inlet channel (7).

20. The method (201 , 202) according to claim 15, using the greenhouse according to claim 9, wherein the method (201, 202) further comprises the steps of: detecting (221), by the third detection unit (49), the temperature, preferably the temperature of air, in the outlet channel (9) at the second position in the outlet channel (9) between the outlet (48) of the outlet channel (9) and the first heat exchanger (11); determining (223), by the control unit (15), that the temperature detected by the third detection unit (49) is higher than the temperature detected by the first detection unit (17) and that the temperature detected by the first detection unit (17) is below a second predetermined temperature; wherein the control unit (15) controls the first valve arrangement (53) for bringing the first valve arrangement (53) in the first state.

21. The method according to any one of the claims 14 - 19 using the greenhouse (301) according to claim 11.

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