JP2006258407A

JP2006258407A - Air conditioning system for agriculture industry

Info

Publication number: JP2006258407A
Application number: JP2005080582A
Authority: JP
Inventors: Keiichi Kimura; 恵一木村; Matsuo Morita; 満津雄森田
Original assignee: Kimura Kohki Co Ltd
Current assignee: Kimura Kohki Co Ltd
Priority date: 2005-03-18
Filing date: 2005-03-18
Publication date: 2006-09-28

Abstract

<P>PROBLEM TO BE SOLVED: To provide an air conditioning system for agriculture industry capable of reducing cost of facilities and operation. <P>SOLUTION: This air conditioning system for agriculture industry is provided with a water cooled heat pump type air conditioner 1 for circulating a heat medium of a subterranean heat exchanger 3 and air-conditioning a space to be air-conditioned using the heat medium in the subterranean heat exchanger 3 as a heat source and an air cooled heat pump type air conditioner 2 for switching circulation and air conditioning in the space to be air-conditioned, ventilation, and circulation and air-conditioning during ventilation freely using air as a heat source. This system switches to single operation of only either of the water cooled heat pump type air conditioner 1 and the air cooled heat pump type air conditioner 3 or operation by use of both of the air conditioners together using at least fluctuation of air conditioning load in the space to be air-conditioned as parameters. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

本発明は農産業用空調システムに関するものである。 The present invention relates to an agricultural air conditioning system.

地中は、所定深度より深くなると年間を通してほぼ一定の温度であるので、その地中熱を利用し空調を行うシステムがある。このシステムは、熱媒を地中熱にて温度調節する地中熱交換器と、地中熱交換器の熱媒を熱源として被空調空間の空調を行う水冷ヒートポンプ式空調機と、を備えている。 Since the underground temperature is almost constant throughout the year when it becomes deeper than a predetermined depth, there is a system that uses the underground heat to perform air conditioning. This system includes a ground heat exchanger that adjusts the temperature of the heat medium with underground heat, and a water-cooled heat pump air conditioner that air-conditions the air-conditioned space using the heat medium of the ground heat exchanger as a heat source. Yes.

特開２００３−２０７１７４号公報JP 2003-207174 A

この地中熱交換器の伝熱管は耐蝕性、耐久性などの点から樹脂にて製作されているため伝熱が悪く、上記システムで大きな空調負荷をまかなおうとすれば、非常に長い伝熱管が必要で設備費用や運転費用などが高くなる問題がある。また、促成栽培などでは、一日の気候変化に関係なく、栽培室内の温度を一日に何回も人工的に変化させるため、ヒートポンプを動かさずに換気のみによる外気冷房または外気暖房の機能が必要となる。このような換気のみによる外気冷房または外気暖房、循環空調、換気しながらの循環空調、の各種パターンの運転に、水冷ヒートポンプ式空調機のみで対応しようとすれば、ダンパなどの多くの部品が必要で、非常に大型化する問題もある。また、地中の熱流量は少ないため、地中熱交換器で長時間連続して熱交換を続けると、周辺の地中温度が変化したまま元に戻りにくくなり、熱交換能力が大幅に低下する。 The heat transfer tubes of this underground heat exchanger are made of resin in terms of corrosion resistance, durability, etc., so heat transfer is bad, so if you try to cover a large air conditioning load with the above system, a very long heat transfer tube Is necessary, and there is a problem that equipment costs and operating costs are high. Also, in forced cultivation, the temperature in the cultivation room is artificially changed several times a day regardless of the daily climate change, so the function of outside air cooling or outside air heating only by ventilation without moving the heat pump is provided. Necessary. If you want to handle various patterns of operation such as outdoor air cooling or heating only with ventilation, circulation air conditioning, and circulation air conditioning while ventilating with only a water-cooled heat pump air conditioner, many parts such as dampers are required. In addition, there is a problem that it becomes very large. In addition, since the heat flow in the ground is small, if heat exchange is continued continuously for a long time with a ground heat exchanger, it will be difficult to return to the original state while the surrounding underground temperature has changed, greatly reducing the heat exchange capacity. To do.

本発明は、上記課題を解決するため、地中熱交換器の熱媒を熱源として被空調空間の循環空調を行う水冷ヒートポンプ式空調機と、空気を熱源として前記被空調空間の循環空調と換気と換気しながらの循環空調を切換え自在に行う空冷ヒートポンプ式空調機と、を備え、すくなくとも前記被空調空間の空調負荷の変動をパラメータとして用いて前記水冷ヒートポンプ式空調機と前記空冷ヒートポンプ式空調機のいずれか一方のみの単独運転または併用運転に切換えるように構成したことを最も主要な特徴とする。 In order to solve the above-mentioned problems, the present invention provides a water-cooled heat pump type air conditioner that circulates and air-conditions the air-conditioned space using the heat medium of the underground heat exchanger as a heat source, and the circulating air-conditioning and ventilation of the air-conditioned space using air as the heat source. An air-cooled heat pump air conditioner that can freely switch between circulating air-conditioning while ventilating, and at least using the fluctuation of the air-conditioning load of the air-conditioned space as a parameter, the water-cooled heat pump air-conditioner and the air-cooled heat pump air-conditioner The most important feature is that it is configured to switch to either one of these alone operation or combined operation.

請求項１の発明によれば、農産業用の被空調空間に対して循環空調、換気循環空調、換気（外気冷房、外気暖房）などの各種パターンの運転を行える。空冷ヒートポンプ式空調機により水冷ヒートポンプ式空調機の空調負荷が減るので、水冷ヒートポンプ式空調機と地中熱交換器を小型化でき設備費用や運転費用などを節減できる。空冷ヒートポンプ式空調機が循環空調と換気と換気しながらの循環空調の機能を備えているので、水冷ヒートポンプ式空調機の構造が簡略化され、小型化を図れる。農作物の栽培用として空気温度を強制的に大幅に変化させる場合、実温度と設定温度の差が大きな空調開始時やピーク時など被空調空間の空調負荷が大きなときは、水冷ヒートポンプ式空調機と空冷ヒートポンプ式空調機を併用運転し、設定温度に達して実温度と設定温度の差が小さくなり被空調空間の空調負荷が小さなときは、水冷ヒートポンプ式空調機と空冷ヒートポンプ式空調機のいずれか一方のみの単独運転を行うことにより運転費用を削減でき、個々の運転時間が減るので長寿命となり、その分農作物などを作るコスト低減を図れる。その場合、水冷ヒートポンプ式空調機の運転を止めれば、地中熱交換器周辺の地中温度を元に戻すことができ、熱交換能力の低下を防止し得る。
請求項２の発明によれば、圧力損失が減少して熱交換効率が向上するので小型の送風機を用いることができ騒音低減を図れる。空気熱交換器も小型化でき空調機をコンパクト化できる。 According to the first aspect of the present invention, various patterns of operation such as circulation air conditioning, ventilation circulation air conditioning, ventilation (outside air cooling, outside air heating) can be performed on the air-conditioned space for the agricultural industry. The air-cooled heat pump air conditioner reduces the air-conditioning load of the water-cooled heat pump air conditioner, so the water-cooled heat pump air conditioner and the underground heat exchanger can be reduced in size, and facility costs and operating costs can be reduced. Since the air-cooled heat pump air conditioner has the functions of circulation air conditioning and circulation air conditioning while ventilating, the structure of the water-cooled heat pump air conditioner is simplified and the size can be reduced. When the air temperature is forcibly and drastically changed for crop cultivation, when the air conditioning load in the air-conditioned space is large, such as when the difference between the actual temperature and the set temperature is large or at the peak time, the water-cooled heat pump air conditioner When the air-cooled heat pump air conditioner is operated in combination and the set temperature is reached and the difference between the actual temperature and the set temperature is small and the air conditioning load in the air-conditioned space is small, either the water-cooled heat pump air conditioner or the air-cooled heat pump air conditioner By operating only one of them, the operating cost can be reduced, and the individual operating time can be reduced, resulting in a longer life and the cost for producing crops can be reduced accordingly. In that case, if the operation of the water-cooled heat pump type air conditioner is stopped, the underground temperature around the underground heat exchanger can be returned to the original, and the decrease in the heat exchange capacity can be prevented.
According to the invention of claim 2, since the pressure loss is reduced and the heat exchange efficiency is improved, a small blower can be used and noise can be reduced. The air heat exchanger can also be downsized and the air conditioner can be downsized.

図１〜図３は、本発明の農産業用空調システムの一実施例を示しており、このシステムは、圧縮式ヒートポンプを有し地中熱交換器３の熱媒を熱源として被空調空間の循環空調を行う水冷ヒートポンプ式空調機１と、圧縮式ヒートポンプを有し空気を熱源として前記被空調空間の循環空調と換気と換気しながらの循環空調を切換え自在に行う空冷ヒートポンプ式空調機２と、を備え、すくなくとも前記被空調空間の空調負荷の変動をパラメータとして用いて水冷ヒートポンプ式空調機１と空冷ヒートポンプ式空調機２のいずれか一方のみの単独運転または併用運転に切換えるように構成したものである。 1 to 3 show an embodiment of an air conditioning system for agricultural industry according to the present invention. This system has a compression heat pump and uses the heat medium of the underground heat exchanger 3 as a heat source for the air-conditioned space. A water-cooled heat pump-type air conditioner 1 that performs circulation air-conditioning, and an air-cooled heat pump-type air conditioner 2 that includes a compression heat pump and that can freely switch between circulation air-conditioning and ventilation and ventilation air circulation in the air-conditioned space. And using at least a change in the air-conditioning load of the air-conditioned space as a parameter, the operation is switched to the single operation or the combined operation of only one of the water-cooled heat pump air conditioner 1 and the air-cooled heat pump air conditioner 2. It is.

水冷ヒートポンプ式空調機１のヒートポンプは、循環冷媒に対して蒸発・圧縮・凝縮・膨張の工程順を繰返し、この循環冷媒と熱交換する空気や熱媒などに対して冷媒蒸発工程で吸熱を冷媒凝縮工程で放熱を各々行うもので、循環冷媒の蒸発工程と凝縮工程であって互いに異なる工程を行う給気側空気熱交換器４及び熱源側水熱交換器５と、循環冷媒を圧縮する圧縮機６と、循環冷媒を膨張させる膨張弁等の減圧機構と、給気側空気熱交換器４及び熱源側水熱交換器５の蒸発工程と凝縮工程を切換えるバルブ等の切換機構と、を少なくとも備え、これらを冷媒が循環するように配管接続して成る。給気側空気熱交換器４では循環冷媒で給気用空気を冷却又は加熱し、熱源側水熱交換器５では熱源水などの熱媒で循環冷媒を凝縮又は蒸発させる。熱源側水熱交換器５はプレート式熱交換器とする。プレート式熱交換器は、たとえば幾枚もの伝熱板（プレート）を重ねその伝熱板と伝熱板の間を熱媒と冷媒が交互に流れて互いに熱交換するように構成する。給気側の空気熱交換器４の伝熱管は圧損の少ない楕円管にするのが好ましいが円形管でもよい。 The heat pump of the water-cooled heat pump type air conditioner 1 repeats the order of evaporation, compression, condensation, and expansion with respect to the circulating refrigerant, and absorbs heat in the refrigerant evaporation process with respect to air or heat medium that exchanges heat with the circulating refrigerant. The heat release is performed in the condensation process, and the air supply side air heat exchanger 4 and the heat source side water heat exchanger 5 that perform different processes in the circulation refrigerant evaporation process and the condensation process, and compression for compressing the circulation refrigerant And at least a switching mechanism such as a valve for switching between an evaporation process and a condensation process of the air supply side air heat exchanger 4 and the heat source side water heat exchanger 5. These are connected by piping so that the refrigerant circulates. The supply air air heat exchanger 4 cools or heats the supply air using a circulating refrigerant, and the heat source water heat exchanger 5 condenses or evaporates the circulating refrigerant using a heat medium such as heat source water. The heat source side water heat exchanger 5 is a plate heat exchanger. The plate heat exchanger is configured so that, for example, a number of heat transfer plates (plates) are stacked and a heat medium and a refrigerant alternately flow between the heat transfer plates and the heat transfer plates to exchange heat with each other. The heat transfer tube of the air heat exchanger 4 on the supply side is preferably an elliptic tube with little pressure loss, but may be a circular tube.

水冷ヒートポンプ式空調機１には、給気口と還気取入口と給気側空気熱交換器４と風量制御自在な給気側送風機と、を設け、還気取入口から取入れた被空調空間の還気を給気側空気熱交換器４で温度調整して給気口から被空調空間へ給気する。この水冷ヒートポンプ式空調機１の熱源側水熱交換器５と、地中に埋設されて内部を流れる熱媒を地中熱で熱交換する地中熱交換器３と、を熱媒が循環するように配管したもので、熱媒は送水ポンプにより送られて水冷ヒートポンプ式空調機１の熱源側水熱交換器５にて熱交換された後、地中熱交換器３にて温度調節され、これらを循環する。図例では、地中熱交換器は、Ｕ字管式を示しているが他のものでもよい。 The water-cooled heat pump type air conditioner 1 is provided with an air supply port, a return air intake port, an air supply side air heat exchanger 4 and an air supply side blower capable of controlling the air volume, and is an air-conditioned space taken from the return air intake port. The temperature of the return air is adjusted by the air supply side air heat exchanger 4 and supplied to the air-conditioned space from the air supply port. The heat medium circulates between the heat source side water heat exchanger 5 of the water-cooled heat pump type air conditioner 1 and the underground heat exchanger 3 that exchanges the heat medium that is buried in the ground and flows inside with the underground heat. The heat medium is sent by a water pump and heat-exchanged by the heat source side water heat exchanger 5 of the water-cooled heat pump type air conditioner 1, and then the temperature is adjusted by the underground heat exchanger 3, Circulate these. In the example shown in the drawing, the underground heat exchanger is U-shaped, but other types may be used.

空冷ヒートポンプ式空調機２のヒートポンプは、循環冷媒に対して蒸発・圧縮・凝縮・膨張の工程順を繰返し、この循環冷媒と熱交換する空気に対して冷媒蒸発工程で吸熱を冷媒凝縮工程で放熱を各々行うもので、循環冷媒の蒸発工程と凝縮工程であって互いに異なる工程を行う給気側空気熱交換器７及び熱源側空気熱交換器８と、循環冷媒を圧縮する圧縮機９と、循環冷媒を膨張させる膨張弁等の減圧機構と、給気側空気熱交換器及び熱源側空気熱交換器の蒸発工程と凝縮工程を切換えるバルブ等の切換機構と、を少なくとも備え、これらを冷媒が循環するように配管接続して成る。給気側空気熱交換器７では循環冷媒で給気用空気を冷却又は加熱し、熱源側空気熱交換器８では熱源用空気で循環冷媒を凝縮又は蒸発させる。給気側と熱源側の空気熱交換器７、８の伝熱管は圧損の少ない楕円管にするのが好ましいが円形管でもよい。 The heat pump of the air-cooled heat pump type air conditioner 2 repeats the order of evaporation, compression, condensation, and expansion for the circulating refrigerant, and dissipates heat in the refrigerant condensation process for the air that exchanges heat with the circulating refrigerant. The air supply side air heat exchanger 7 and the heat source side air heat exchanger 8 that perform the steps of evaporating and condensing the circulating refrigerant, which are different from each other, and the compressor 9 for compressing the circulating refrigerant, A decompression mechanism such as an expansion valve that expands the circulating refrigerant, and a switching mechanism such as a valve that switches between an evaporation process and a condensation process of the air supply side air heat exchanger and the heat source side air heat exchanger. It is connected by piping so that it circulates. The supply side air heat exchanger 7 cools or heats the supply air with the circulating refrigerant, and the heat source side air heat exchanger 8 condenses or evaporates the circulating refrigerant with the heat source air. The heat transfer tubes of the air heat exchangers 7 and 8 on the air supply side and the heat source side are preferably elliptical tubes with little pressure loss, but may be circular tubes.

空冷ヒートポンプ式空調機２は、給気口と第１還気取入口と第１外気取入口に各々連通する給気側送風路Ａと、排気口と第２還気取入口と第２外気取入口とに各々連通する熱源側送風路Ｂと、を備え、給気側送風路Ａには、第１外気取入口からの外気と第１還気取入口からの還気とがダンパ機構により選択的に通風される給気側空気熱交換器７と、風量制御自在な給気側送風機と、を設け、熱源側送風路Ｂには、第２外気取入口からの外気と第２還気取入口からの還気とが前記ダンパ機構により選択的に通風される熱源側水熱交換器８と、風量制御自在な熱源側送風機と、を設ける。前記ダンパ機構は、第１還気取入口から給気側空気熱交換器７への還気風量を制御する第１還気ダンパ１０と、第１外気取入口から給気側空気熱交換器７への外気風量を制御する第１外気ダンパ１１と、第２還気取入口から熱源側空気熱交換器８への還気風量を制御する第２還気ダンパ１２と、第２外気取入口から熱源側空気熱交換器８への外気風量を制御する第２外気ダンパ１３と、を設けて構成し、風量制御を行う。この風量制御や、水冷ヒートポンプ式空調機１と空冷ヒートポンプ式空調機２のいずれか一方のみの単独運転または併用運転に切換える制御、ヒートポンプと送風機の各々の容量制御、給気側の空気熱交換器４、７の冷媒蒸発・冷媒凝縮の切換制御、は図示省略の制御手段にて行う。なお、水冷ヒートポンプ式空調機１と空冷ヒートポンプ式空調機２の台数の増減は自由である。 The air-cooled heat pump air conditioner 2 includes an air supply side air passage A that communicates with the air supply port, the first return air intake port, and the first outside air intake port, an exhaust port, a second return air intake port, and a second outside air intake. A heat source side air passage B communicating with each of the inlets, and the air supply side air passage A selects outside air from the first outside air inlet and return air from the first return air inlet by a damper mechanism. The air supply side air heat exchanger 7 that is ventilated automatically and the air supply side blower that can control the air volume are provided, and the heat source side air passage B is provided with the outside air from the second outside air inlet and the second return air intake. A heat source side water heat exchanger 8 through which the return air from the inlet is selectively ventilated by the damper mechanism and a heat source side blower capable of controlling the air volume are provided. The damper mechanism includes a first return air damper 10 that controls the amount of return air flow from the first return air intake to the supply side air heat exchanger 7, and the supply side air heat exchanger 7 from the first outside air intake. From the first outside air damper 11 that controls the amount of outside air to the air, from the second return air damper 12 that controls the amount of air returned from the second return air intake to the heat source side air heat exchanger 8, and from the second outside air intake A second outside air damper 13 that controls the outside air flow rate to the heat source side air heat exchanger 8 is provided and configured to perform air volume control. This air volume control, control to switch to single operation or combined operation of either one of the water-cooled heat pump air conditioner 1 and the air-cooled heat pump air conditioner 2, capacity control of each of the heat pump and blower, air heat exchanger on the air supply side Switching control of refrigerant evaporation / refrigerant condensation 4 and 7 is performed by a control means (not shown). The number of water-cooled heat pump air conditioners 1 and air-cooled heat pump air conditioners 2 can be increased or decreased.

この空冷ヒートポンプ式空調機２で循環空調運転するには、第１外気ダンパ１１と第２還気ダンパ１２を閉、第２外気ダンパ１３と第１還気ダンパ１０を開にし、第１還気ダンパ１０から取入れた被空調空間の還気を給気側空気熱交換器７で温度調整して給気口から被空調空間へ給気し、第２外気取入口１３から取入れた外気を熱源側空気熱交換器８で吸熱又は放熱し排気口から屋外へ排気する。換気循環空調運転では、第１・第２外気ダンパ１１、１３と第１・第２還気ダンパ１０、１２を開にし、第１還気ダンパ１０から取入れた還気と第１外気ダンパ１１から取入れた外気を所定割合で混合して給気側空気熱交換器７で温度調整して給気口から被空調空間へ給気し、第２外気ダンパ１３から取入れた外気と第２還気ダンパ１２から取入れた還気を所定割合で混合して熱源側空気熱交換器８で還気から熱回収しながら吸熱又は放熱し排気口から屋外へ排気する。換気（外気冷房、外気暖房）運転では、空冷ヒートポンプ式空調機２のヒートポンプを止めて、第１還気ダンパ１０と第２外気ダンパ１３を閉、第１外気ダンパ１１と第２還気ダンパ１２を開にして、第１外気ダンパ１１から外気を取入れて被空調空間に給気し、第２還気ダンパ１２から取入れた還気を排気口から屋外へ排気する。 In order to perform the circulating air-conditioning operation with the air-cooled heat pump air conditioner 2, the first outside air damper 11 and the second return air damper 12 are closed, the second outside air damper 13 and the first return air damper 10 are opened, and the first return air is opened. The temperature of the return air of the air-conditioned space taken in from the damper 10 is adjusted by the air supply side air heat exchanger 7 to supply air to the air-conditioned space from the air supply port, and the outside air taken in from the second outside air intake port 13 is heat source side The air heat exchanger 8 absorbs or dissipates heat and exhausts it from the exhaust port to the outside. In the ventilation circulation air conditioning operation, the first and second outside air dampers 11 and 13 and the first and second return air dampers 10 and 12 are opened, and the return air taken in from the first return air damper 10 and the first outside air damper 11 are used. The taken-in outside air is mixed at a predetermined ratio, the temperature is adjusted by the supply-side air heat exchanger 7, the air is supplied from the supply port to the air-conditioned space, and the outside air taken in from the second outside air damper 13 and the second return air damper The return air taken in from 12 is mixed at a predetermined rate, and the heat source side air heat exchanger 8 absorbs heat or dissipates heat while recovering heat from the return air, and exhausts it from the exhaust port to the outside. In the ventilation (outside air cooling, outside air heating) operation, the heat pump of the air cooling heat pump type air conditioner 2 is stopped, the first return air damper 10 and the second outside air damper 13 are closed, and the first outside air damper 11 and the second return air damper 12 are closed. Is opened, outside air is taken in from the first outside air damper 11 and supplied to the air-conditioned space, and the return air taken in from the second return air damper 12 is exhausted from the exhaust port to the outside.

例えば、被空調空間の空調負荷が大きなときは、水冷ヒートポンプ式空調機１と空冷ヒートポンプ式空調機２を併用運転し、被空調空間の空調負荷が小さなときは、水冷ヒートポンプ式空調機１と空冷ヒートポンプ式空調機２のいずれか一方のみの単独運転を行う。このとき、地中熱交換器３の熱媒温度をパラメータとして併用し、地中熱交換器３の能力が低下した場合に空冷ヒートポンプ式空調機２のみの単独運転を行って、地中熱交換器３の周辺温度を回復させるようにしてもよく、あるいは、外気温度をパラメータとして併用して単独運転と併用運転を切換え制御するも自由である。 For example, when the air-conditioning load in the air-conditioned space is large, the water-cooled heat pump air conditioner 1 and the air-cooled heat pump air-conditioner 2 are operated together. When the air-conditioning load in the air-conditioned space is small, the water-cooled heat pump air conditioner 1 and air-cooled Only one of the heat pump air conditioners 2 is operated alone. At this time, the heat medium temperature of the underground heat exchanger 3 is used as a parameter, and when the capacity of the underground heat exchanger 3 decreases, only the air-cooled heat pump type air conditioner 2 is operated alone, and the underground heat exchange is performed. The ambient temperature of the vessel 3 may be recovered, or the independent operation and the combined operation can be switched and controlled using the outside air temperature as a parameter.

本発明の構成例を示す簡略平面図。The simplified top view which shows the structural example of this invention. 水冷ヒートポンプ式空調機の説明図。Explanatory drawing of a water-cooled heat pump type air conditioner. 空冷ヒートポンプ式空調機の説明図。Explanatory drawing of an air-cooling heat pump type air conditioner.

符号の説明Explanation of symbols

１水冷ヒートポンプ式空調機
２空冷ヒートポンプ式空調機
３地中熱交換器 1 Water-cooled heat pump type air conditioner 2 Air-cooled heat pump type air conditioner 3 Ground heat exchanger

Claims

地中熱交換器３の熱媒を熱源として被空調空間の循環空調を行う水冷ヒートポンプ式空調機１と、空気を熱源として前記被空調空間の循環空調と換気と換気しながらの循環空調を切換え自在に行う空冷ヒートポンプ式空調機２と、を備え、すくなくとも前記被空調空間の空調負荷の変動をパラメータとして用いて前記水冷ヒートポンプ式空調機１と前記空冷ヒートポンプ式空調機３のいずれか一方のみの単独運転または併用運転に切換えるように構成したことを特徴とする農産業用空調システム。 Switch between water-cooled heat pump type air conditioner 1 that circulates and air-conditions the air-conditioned space using the heat medium of the underground heat exchanger 3 as a heat source, and circulation air-conditioning and ventilation and ventilation of the air-conditioned space using air as the heat source An air-cooled heat pump air conditioner 2 that can be freely operated, and at least one of the water-cooled heat pump air conditioner 1 and the air-cooled heat pump air conditioner 3 using a change in the air-conditioning load of the air-conditioned space as a parameter. An air conditioning system for agricultural industry, characterized in that it is configured to switch to single operation or combined operation.

水冷ヒートポンプ式空調機１と空冷ヒートポンプ式空調機２の空気熱交換器の伝熱管を楕円管にした請求項１記載の農産業用空調システム。 The air conditioning system for agricultural industry according to claim 1, wherein the heat transfer tubes of the air heat exchanger of the water-cooled heat pump air conditioner 1 and the air-cooled heat pump air conditioner 2 are elliptical tubes.