JP2010107059A - Refrigerating and air-conditioning apparatus - Google Patents

Refrigerating and air-conditioning apparatus Download PDF

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JP2010107059A
JP2010107059A JP2008276542A JP2008276542A JP2010107059A JP 2010107059 A JP2010107059 A JP 2010107059A JP 2008276542 A JP2008276542 A JP 2008276542A JP 2008276542 A JP2008276542 A JP 2008276542A JP 2010107059 A JP2010107059 A JP 2010107059A
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heat exchanger
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indoor
intake
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JP5068235B2 (en
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Koyu Tanaka
航祐 田中
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Mitsubishi Electric Corp
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Abstract

<P>PROBLEM TO BE SOLVED: To provide of a refrigerating and air-conditioning apparatus that executes operation of high efficiency, by supplying desorbed heat to a desiccant by using sensible heat discharged by a refrigerant, switching cooling and dehumidification/humidification by a single four-way valve necessary for switching a flow channel, and reducing the cost by simplifying the constitution of a refrigerant circuit. <P>SOLUTION: This refrigerating and air-conditioning apparatus includes the refrigerant circuit, constituting a refrigerating cycle including a compressor 4; the four-way valve 5, an outdoor heat exchanger 7, an expansion valve 8 and an indoor heat exchanger 9, an intake air heat exchanger 10 disposed in an intake air duct 21 upstream of a desiccant rotor 11, and an exhaust heat exchanger 6 disposed in an exhaust air duct 22 upstream of the desiccant rotor 11. The refrigerant circuit is constituted, by connecting an intermediate section of the four-way valve 5 and the outdoor heat exchanger 7 to the exhaust heat exchanger 6 and connecting an intermediate section of the indoor heat exchanger 9 and the four-way valve 5 to the intake air heat exchanger 10. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

本発明は、冷凍空調装置に関するものであり、特にデシカントによる空気中の水分の吸脱着を利用して冷暖房と除加湿を同時に行う装置に関するものである。   The present invention relates to a refrigerating and air-conditioning apparatus, and more particularly to an apparatus that simultaneously performs cooling and heating and dehumidification using absorption and desorption of moisture in the air by a desiccant.

従来のデシカントを用いて冷暖房と除加湿を同時に行う冷凍空調装置として、特許文献1の例がある。   There exists an example of patent document 1 as a refrigeration air conditioning apparatus which performs air conditioning and dehumidification / humidification simultaneously using the conventional desiccant.

特開2005−164165号公報JP 2005-164165 A

特許文献1では、凝縮器となる熱交換器出口と蒸発器となる熱交換器入口の間の冷媒流路に、吸着剤を添着した熱交換器を2つ設け、一方を高圧高温の熱交換器として用い水分の脱着を行うとともに、他方を低圧低温の熱交換器として用い水分の吸着を行うものである。そして所定時間間隔で四方弁の切り替えにより高低圧を入れ替えることで、吸脱着を繰り返して行うとともに、それぞれの熱交換器を吸気・排気風路に配置し、除加湿を行うようにしている。   In Patent Document 1, two heat exchangers with adsorbents are provided in a refrigerant flow path between a heat exchanger outlet serving as a condenser and a heat exchanger inlet serving as an evaporator. The desorption of moisture is used as a vessel, and the other is used as a low-pressure and low-temperature heat exchanger to adsorb moisture. By switching the high and low pressures by switching the four-way valve at predetermined time intervals, the adsorption and desorption are repeated, and the respective heat exchangers are arranged in the intake and exhaust air passages to perform dehumidification.

しかしながら、従来の装置では、脱着のための熱交換器が凝縮器下流側に配置されているため、脱着熱に用いることのできる冷媒温度は高くても凝縮温度となる。従って、除加湿量を十分に得るために脱着温度を高めようとした場合は、凝縮器にて放熱するのに必要な凝縮温度よりも高い凝縮温度で運転することになり、装置の運転効率が低下するという課題があった。
また、従来の装置では、冷暖房機能を切り替えるための四方弁に加えて、吸脱着を切り替えるための四方弁が必要であり、冷媒回路構成が複雑になり高コストとなる課題があった。
However, in the conventional apparatus, since the heat exchanger for desorption is arranged on the downstream side of the condenser, the refrigerant temperature that can be used for the desorption heat is the condensation temperature even if it is high. Therefore, when trying to increase the desorption temperature in order to obtain a sufficient amount of dehumidification, operation is performed at a condensation temperature higher than the condensation temperature necessary for heat dissipation by the condenser, and the operating efficiency of the device is reduced. There was a problem of a decrease.
Moreover, in the conventional apparatus, in addition to the four-way valve for switching the cooling / heating function, a four-way valve for switching the adsorption / desorption is necessary, and there is a problem that the refrigerant circuit configuration becomes complicated and the cost is high.

本発明は、上述のような課題を解決するためになされたものであり、冷媒の吐出顕熱を用いてデシカントに脱着熱を供給することで、高効率の運転を実現するとともに、流路切り替えに要する四方弁を1つで冷暖と除加湿の切り替え動作を行い、簡単な冷媒回路構成で低コストの冷凍空調装置を実現することを目的とする。   The present invention has been made in order to solve the above-described problems. By supplying desorption heat to the desiccant using the sensible heat of the refrigerant, high efficiency operation and switching of the flow path are achieved. The purpose is to realize a low-cost refrigerating and air-conditioning apparatus with a simple refrigerant circuit configuration by performing a switching operation between cooling and heating and dehumidification / humidification with one four-way valve required for the above.

本発明に係る冷凍空調装置は、
圧縮機、四方弁、室外熱交換器、減圧装置、室内熱交換器を含む冷凍サイクルを構成する冷媒回路と、
室内と室外の間で換気を行うための吸気風路、排気風路と、
吸気風路と排気風路とを流れる空気中の水分を吸脱着作用にて移動するデシカントロータと、
吸気風路にデシカントロータより上流側に配置された吸気熱交換器と、
排気風路にデシカントロータより上流側に配置された排気熱交換器とを備え、
前記冷媒回路が、前記四方弁と前記室外熱交換器との中間部を前記排気熱交換器に接続するとともに、前記室内熱交換器と前記四方弁との中間部を前記吸気熱交換器に接続する構成となっているものである。
The refrigerating and air-conditioning apparatus according to the present invention is
A refrigerant circuit constituting a refrigeration cycle including a compressor, a four-way valve, an outdoor heat exchanger, a decompressor, and an indoor heat exchanger;
Intake and exhaust air passages for ventilation between indoors and outdoors,
A desiccant rotor that moves moisture in the air flowing through the intake air flow path and the exhaust air flow path by adsorption and desorption;
An intake heat exchanger disposed upstream of the desiccant rotor in the intake air passage;
An exhaust heat exchanger disposed upstream of the desiccant rotor in the exhaust air passage;
The refrigerant circuit connects an intermediate portion between the four-way valve and the outdoor heat exchanger to the exhaust heat exchanger, and connects an intermediate portion between the indoor heat exchanger and the four-way valve to the intake heat exchanger. It is the composition which becomes.

本発明の冷凍空調装置は、上記のように構成することにより、冷房除湿運転時には、圧縮機、四方弁、排気熱交換器、室外熱交換器、室内減圧装置、室内熱交換器、吸気熱交換器、四方弁、圧縮機が環状に接続された冷凍サイクルを構成し、暖房加湿運転時には、圧縮機、四方弁、吸気熱交換器、室内熱交換器、室内減圧装置、室外熱交換器、排気熱交換器、四方弁、圧縮機が環状に接続された冷凍サイクルを構成するので、冷房除湿運転、暖房加湿運転のいずれであっても圧縮機の吐出冷媒の高温顕熱をデシカントロータの脱着熱に用いることができ、したがって、冷凍サイクルの凝縮温度を低く運転しても除加湿性能を十分に発揮でき、高効率の運転を実現することができる。   The refrigerating and air-conditioning apparatus of the present invention is configured as described above, so that during the cooling and dehumidifying operation, the compressor, the four-way valve, the exhaust heat exchanger, the outdoor heat exchanger, the indoor pressure reducing device, the indoor heat exchanger, and the intake heat exchange A refrigeration cycle in which a compressor, a four-way valve, and a compressor are connected in a ring shape. During heating and humidification operation, the compressor, four-way valve, intake heat exchanger, indoor heat exchanger, indoor decompressor, outdoor heat exchanger, exhaust Since the heat exchanger, four-way valve, and compressor are configured in a refrigeration cycle, the high-temperature sensible heat of the refrigerant discharged from the compressor is desorbed from the desiccant rotor in both the cooling and dehumidifying operation and the heating and humidifying operation. Therefore, even if the condensation temperature of the refrigeration cycle is operated at a low temperature, the dehumidifying / humidifying performance can be sufficiently exhibited, and a highly efficient operation can be realized.

実施の形態1.
本発明の実施の形態1に係る冷凍空調装置の構成を図1に基づいて説明する。図1は、実施の形態1に係る冷凍空調装置の冷媒回路と換気時の風路構成を示したものであり、本実施の形態の冷凍空調装置は、図1に示すように、室外ユニット1と、室内ユニット2と、換気ユニット3とを備える。
室外ユニット1内には、圧縮機4、四方弁5、室外熱交換器7、冷凍空調装置の計測、制御を実施する計測制御装置12が搭載される。
圧縮機4はインバータにより回転数が制御され容量制御されるタイプである。室外熱交換器7はファンなどで送風される外気と冷媒との間で熱交換を行う。
Embodiment 1 FIG.
A configuration of the refrigerating and air-conditioning apparatus according to Embodiment 1 of the present invention will be described with reference to FIG. FIG. 1 shows the refrigerant circuit of the refrigerating and air-conditioning apparatus according to Embodiment 1 and the air path configuration during ventilation. The refrigerating and air-conditioning apparatus of this embodiment includes an outdoor unit 1 as shown in FIG. And an indoor unit 2 and a ventilation unit 3.
In the outdoor unit 1, a measurement control device 12 that performs measurement and control of the compressor 4, the four-way valve 5, the outdoor heat exchanger 7, and the refrigeration air conditioner is mounted.
The compressor 4 is a type in which the rotation speed is controlled by an inverter and the capacity is controlled. The outdoor heat exchanger 7 exchanges heat between the outside air blown by a fan or the like and the refrigerant.

室内ユニット2内には、室内熱交換器9と室内減圧装置である室内膨張弁8が搭載される。室内熱交換器9はファンなどで送風される室内側空気と冷媒との間で熱交換を行う。室内膨張弁8は、開度が可変である電子膨張弁である。   In the indoor unit 2, an indoor heat exchanger 9 and an indoor expansion valve 8 which is an indoor pressure reducing device are mounted. The indoor heat exchanger 9 performs heat exchange between indoor air blown by a fan or the like and the refrigerant. The indoor expansion valve 8 is an electronic expansion valve whose opening degree is variable.

換気ユニット3は、図1の一点鎖線で囲まれた室内領域Aと室外との換気を行うものである。図1の点線の上半分で囲まれた風路が吸気風路21であり、室外空気(OA)を室内に吸気(SA)する。図1の点線の下半分で囲まれた風路が排気風路22であり、室内空気(RA)を室外に排気(EA)する。換気ユニット3の排気風路22内には排気熱交換器6が設けられ、吸気風路21内には吸気熱交換器10が設けられ、また両風路21、22にまたがってデシカントロータ11が回転可能もしくは反転可能に設けられている。吸気、排気の送風はそれぞれの風路に設けられたファンで行われる。デシカントロータ11は回転もしくは反転しながら、吸気風路21と排気風路22を交互に通過するように配置される。デシカントロータ11は、ハニカム部材や多孔性部材等の表面にゼオライトやシリカゲルなどの吸着剤が添着されたものであり、吸排気の空気との間で水分の移動を行うものである。排気熱交換器6は排気風路22に設けられ、デシカントロータ11の上流側に配置され、デシカントロータ11流入前の排気と熱交換を行い、吸気熱交換器10は吸気風路21に設けられ、デシカントロータ11の上流側に配置され、デシカントロータ11流入前の吸気と熱交換を行う。即ち、排気熱交換器6は四方弁5と室外熱交換器7との中間部に配管で接続され、吸気熱交換器10は室内熱交換器9と四方弁5との中間部に配管で接続されて、冷凍サイクルを構成する冷媒回路が構成されている。   The ventilation unit 3 performs ventilation between the indoor region A surrounded by the one-dot chain line in FIG. The air passage surrounded by the upper half of the dotted line in FIG. 1 is the intake air passage 21, and sucks outdoor air (OA) into the room (SA). The air passage surrounded by the lower half of the dotted line in FIG. 1 is the exhaust air passage 22 and exhausts the indoor air (RA) to the outside (EA). The exhaust heat exchanger 6 is provided in the exhaust air passage 22 of the ventilation unit 3, the intake heat exchanger 10 is provided in the intake air passage 21, and the desiccant rotor 11 is extended over both the air passages 21 and 22. It is provided so as to be rotatable or reversible. Intake and exhaust air are blown by fans provided in the respective air passages. The desiccant rotor 11 is disposed so as to alternately pass through the intake air passage 21 and the exhaust air passage 22 while rotating or reversing. The desiccant rotor 11 is formed by adsorbing an adsorbent such as zeolite or silica gel on the surface of a honeycomb member, a porous member or the like, and moves moisture between intake and exhaust air. The exhaust heat exchanger 6 is provided in the exhaust air passage 22 and is arranged on the upstream side of the desiccant rotor 11 to exchange heat with the exhaust before flowing into the desiccant rotor 11. The intake heat exchanger 10 is provided in the intake air passage 21. It is arranged on the upstream side of the desiccant rotor 11 and performs heat exchange with the intake air before flowing into the desiccant rotor 11. That is, the exhaust heat exchanger 6 is connected to an intermediate portion between the four-way valve 5 and the outdoor heat exchanger 7 by piping, and the intake heat exchanger 10 is connected to an intermediate portion between the indoor heat exchanger 9 and the four-way valve 5 by piping. Thus, a refrigerant circuit constituting the refrigeration cycle is configured.

室内ユニット2には湿度センサ13が設けられ、室内湿度を計測する。また室外ユニット1、室内ユニット2、換気ユニット3には温度センサ14が設けられ、温度センサ14aは圧縮機4の吐出側、温度センサ14bは圧縮機4の吸入側、温度センサ14dは室内熱交換器9と室内膨張弁8の間の冷媒配管上に、温度センサ14eは室内熱交換器9と吸気熱交換器10の間の冷媒配管上に配置され、それぞれ配置場所の冷媒温度を計測する。また、温度センサ14cが室外ユニット1周囲の外気温度を計測し、温度センサ14fが室内ユニット2周囲の室内温度を計測し、温度センサ14gが換気ユニット3の排気風路22のデシカントロータ11に流入する空気温度を計測し、温度センサ14hが換気ユニット3の吸気風路21のデシカントロータ11に流入する空気温度を計測する。   The indoor unit 2 is provided with a humidity sensor 13 to measure indoor humidity. The outdoor unit 1, the indoor unit 2, and the ventilation unit 3 are provided with temperature sensors 14, the temperature sensor 14a is the discharge side of the compressor 4, the temperature sensor 14b is the suction side of the compressor 4, and the temperature sensor 14d is the indoor heat exchange. The temperature sensor 14e is arranged on the refrigerant pipe between the indoor heat exchanger 9 and the intake heat exchanger 10 on the refrigerant pipe between the chamber 9 and the indoor expansion valve 8, and measures the refrigerant temperature at the arrangement place. Further, the temperature sensor 14 c measures the outside air temperature around the outdoor unit 1, the temperature sensor 14 f measures the room temperature around the indoor unit 2, and the temperature sensor 14 g flows into the desiccant rotor 11 of the exhaust air passage 22 of the ventilation unit 3. The temperature sensor 14h measures the temperature of the air flowing into the desiccant rotor 11 in the intake air passage 21 of the ventilation unit 3.

室外ユニット1には圧力センサ15が設けられ、圧力センサ15aは圧縮機4の吐出側、圧力センサ15bは圧縮機4の吸入側に配置され、それぞれ配置場所の冷媒圧力を計測する。   The outdoor unit 1 is provided with a pressure sensor 15, the pressure sensor 15 a is arranged on the discharge side of the compressor 4, and the pressure sensor 15 b is arranged on the suction side of the compressor 4, and measures the refrigerant pressure at the arrangement location.

室外ユニット1内の計測制御装置12は、各ユニットの湿度センサ13、温度センサ14、圧力センサ15の計測情報や、装置使用者から指示される運転内容に基づいて、圧縮機4の運転方法、室外熱交換器7、室内熱交換器9、換気ユニット3のファン送風量、室内膨張弁8の開度などを制御する。   The measurement control device 12 in the outdoor unit 1 is based on the measurement information of the humidity sensor 13, the temperature sensor 14, and the pressure sensor 15 of each unit and the operation content instructed by the user of the device. The outdoor heat exchanger 7, the indoor heat exchanger 9, the fan air flow rate of the ventilation unit 3, the opening degree of the indoor expansion valve 8, and the like are controlled.

次に、この冷凍空調装置の運転動作について説明する。
(冷房除湿運転)
はじめに、室内ユニット2で冷房運転を行うとともに、換気ユニット3では吸気の除湿を行う冷房除湿運転の運転動作について説明する。冷房除湿運転時の冷媒の流れを図1に実線の矢印で示す。
まず、冷媒回路の動作について図1および図2に示すp−h線図をもとに説明する。四方弁5の流路は図1に実線で示す向きに切り替えられる。圧縮機4から吐出された高温高圧のガス冷媒(図2の点1の状態)は四方弁5を経て室外ユニット1を流出して、換気ユニット3に流入し、排気熱交換器6で排気風路22の空気に放熱しながら冷却され温度が低下する(図2の点2の状態)。その後、冷媒は換気ユニット3を流出し、室外ユニット1に流入し、凝縮器となる室外熱交換器7にて室外ユニット1周囲の空気に放熱しながら凝縮液化し、高圧低温の液冷媒となる(図2の点3の状態)。
Next, the operation of the refrigeration air conditioner will be described.
(Cooling dehumidification operation)
First, while the cooling operation is performed in the indoor unit 2, the operation of the cooling and dehumidifying operation in which the ventilation unit 3 dehumidifies intake air will be described. The flow of the refrigerant during the cooling and dehumidifying operation is shown by solid line arrows in FIG.
First, the operation of the refrigerant circuit will be described based on the ph diagrams shown in FIGS. 1 and 2. The flow path of the four-way valve 5 is switched in the direction indicated by the solid line in FIG. The high-temperature and high-pressure gas refrigerant discharged from the compressor 4 (state of point 1 in FIG. 2) flows out of the outdoor unit 1 through the four-way valve 5, flows into the ventilation unit 3, and is exhausted by the exhaust heat exchanger 6. It cools while radiating heat to the air of the path 22 and the temperature drops (state of point 2 in FIG. 2). Thereafter, the refrigerant flows out of the ventilation unit 3, flows into the outdoor unit 1, and is condensed and liquefied while dissipating heat to the air around the outdoor unit 1 in the outdoor heat exchanger 7 serving as a condenser, and becomes a high-pressure and low-temperature liquid refrigerant. (State at point 3 in FIG. 2).

その後、冷媒は室外ユニット1を流出し、室内ユニット2に流入し、室内膨張弁8にて減圧され低圧の二相冷媒となり(図2の点4の状態)、そして蒸発器となる室内熱交換器9に流入し、そこで室内空気から吸熱し、蒸発ガス化(図2の点5の状態)しながら室内ユニット2内の空気に冷熱を供給する。室内熱交換器9を出た低圧ガス冷媒は室内ユニット2を出て、室外ユニット1を経て換気ユニット3に流入し、吸気熱交換器10にて吸気風路21の空気から吸熱しながら加熱され、より高温の状態となった後で(図2の点6の状態)、換気ユニット3を流出し、室外ユニット1に流入し、四方弁5を経て圧縮機4の吸入側に戻る。   Thereafter, the refrigerant flows out of the outdoor unit 1, flows into the indoor unit 2, is decompressed by the indoor expansion valve 8, becomes a low-pressure two-phase refrigerant (state of point 4 in FIG. 2), and indoor heat exchange that becomes an evaporator It flows into the vessel 9, where it absorbs heat from the room air and supplies cold heat to the air in the room unit 2 while evaporating gas (in the state of point 5 in FIG. 2). The low-pressure gas refrigerant exiting the indoor heat exchanger 9 exits the indoor unit 2, flows into the ventilation unit 3 through the outdoor unit 1, and is heated while absorbing heat from the air in the intake air passage 21 in the intake heat exchanger 10. After reaching a higher temperature state (state of point 6 in FIG. 2), the ventilation unit 3 flows out, flows into the outdoor unit 1, and returns to the suction side of the compressor 4 through the four-way valve 5.

次に、換気ユニット3における吸排気の動作について説明する。室外から室内への吸気(OA)は、まず、吸気風路21の吸気熱交換器10に流入し、そこで冷媒に吸熱され温度が低下するとともに、相対湿度が上昇する。その後、吸気はデシカントロータ11を通過し、その際水分を吸着し、除湿されるとともに吸着熱により温度が上昇し、高温低湿の空気となり、室内に供給される(SA)。室内から室外への排気(RA)は、低温低湿の状態から排気風路22の排気熱交換器6によって加熱され、高温低湿の状態となる。その後、デシカントロータ11に流入し、デシカントロータ11の吸着水分を再生、脱着する。その際、脱着熱を奪われ若干温度が低下し、高温高湿の状態となった後で排気される(EA)。   Next, the operation of intake and exhaust in the ventilation unit 3 will be described. The intake air (OA) from the outside into the room first flows into the intake heat exchanger 10 in the intake air passage 21, where it is absorbed by the refrigerant and the temperature decreases and the relative humidity increases. Thereafter, the intake air passes through the desiccant rotor 11 and adsorbs moisture at that time, dehumidifies and rises in temperature due to adsorption heat, becomes high-temperature and low-humidity air, and is supplied indoors (SA). Exhaust air (RA) from the room to the outside is heated from the low temperature and low humidity state by the exhaust heat exchanger 6 in the exhaust air passage 22 to be in a high temperature and low humidity state. Thereafter, it flows into the desiccant rotor 11 to regenerate and desorb the adsorbed moisture of the desiccant rotor 11. At that time, desorption heat is taken away, the temperature is slightly lowered, and after being in a high temperature and high humidity state, it is exhausted (EA).

(暖房加湿運転)
次に、室内ユニット2で暖房運転を行うとともに、換気ユニット3では吸気の加湿を行う暖房加湿運転の運転動作について説明する。暖房加湿運転時の冷媒の流れを図1に点線の矢印で示す。
まず、冷媒回路の動作について図1および図2に示すp−h線図をもとに説明する。p−h線図は暖房加湿運転においても、冷房除湿運転と同様の変化となる。四方弁5の流路は図1に点線で示す向きに切り替えられる。圧縮機4から吐出された高温高圧のガス冷媒(図2の点1の状態)は四方弁5を経て室外ユニット1を流出して、換気ユニット3に流入し、吸気熱交換器10で吸気風路21の空気に放熱しながら冷却され温度が低下する(図2の点2の状態)。その後、冷媒は換気ユニット3を流出し、室内ユニット2に流入する。その後、冷媒は室内熱交換器9に流入し、そこで室内空気に放熱し、凝縮液化(図2の点3の状態)しながら室内ユニット2内の空気に温熱を供給する。その後、冷媒は室内膨張弁8にて減圧され低圧の二相冷媒となり(図2の点4の状態)、室内ユニット2を流出し、室外ユニット1に流入する。
(Heating and humidifying operation)
Next, the heating operation in the indoor unit 2 and the operation of the heating / humidifying operation in which the ventilation unit 3 humidifies the intake air will be described. The flow of the refrigerant during the heating and humidifying operation is indicated by a dotted arrow in FIG.
First, the operation of the refrigerant circuit will be described based on the ph diagrams shown in FIGS. 1 and 2. The ph diagram shows the same change in the heating and humidifying operation as in the cooling and dehumidifying operation. The flow path of the four-way valve 5 is switched in the direction indicated by the dotted line in FIG. The high-temperature and high-pressure gas refrigerant discharged from the compressor 4 (state of point 1 in FIG. 2) flows out of the outdoor unit 1 through the four-way valve 5, flows into the ventilation unit 3, and takes in the intake air in the intake heat exchanger 10 Cooling while radiating heat to the air in the passage 21, the temperature drops (state of point 2 in FIG. 2). Thereafter, the refrigerant flows out of the ventilation unit 3 and flows into the indoor unit 2. Thereafter, the refrigerant flows into the indoor heat exchanger 9, where it dissipates heat to the indoor air and supplies warm air to the air in the indoor unit 2 while condensing and liquefying (the state of point 3 in FIG. 2). Thereafter, the refrigerant is decompressed by the indoor expansion valve 8 to become a low-pressure two-phase refrigerant (state of point 4 in FIG. 2), flows out of the indoor unit 2, and flows into the outdoor unit 1.

室外ユニット1に流入した冷媒は室外熱交換器7にて室外ユニット1周囲の空気から吸熱しながら蒸発ガス化し、低圧のガスの冷媒となる(図2の点5の状態)。室外熱交換器7を出た低圧ガス冷媒は室外ユニット1を流出し換気ユニット3に流入し、排気熱交換器6にて排気風路22の空気から吸熱しながら加熱され、より高温の状態となった後で(図2の点6の状態)、換気ユニット3を流出し、室外ユニット1に流入し、四方弁5を経て圧縮機4の吸入側に戻る。   The refrigerant that has flowed into the outdoor unit 1 is evaporated and gasified while absorbing heat from the air around the outdoor unit 1 in the outdoor heat exchanger 7, and becomes a low-pressure gas refrigerant (state of point 5 in FIG. 2). The low-pressure gas refrigerant exiting the outdoor heat exchanger 7 flows out of the outdoor unit 1 and flows into the ventilation unit 3, and is heated while absorbing heat from the air in the exhaust air passage 22 in the exhaust heat exchanger 6. After that (the state at point 6 in FIG. 2), the ventilation unit 3 flows out, flows into the outdoor unit 1, and returns to the suction side of the compressor 4 through the four-way valve 5.

次に、換気ユニット3における吸排気の動作について説明する。室内から室外への排気(RA)は、まず、排気風路22の排気熱交換器6に流入し、そこで冷媒に吸熱され温度が低下するとともに、相対湿度が上昇する。その後、排気はデシカントロータ11を通過し、その際水分を吸着し、除湿されるとともに吸着熱により温度が上昇して排気される(EA)。室外から室内への吸気(OA)は、低温低湿の状態から吸気風路21の吸気熱交換器10によって加熱され、高温低湿の状態となる。その後、デシカントロータ11に流入し、デシカントロータ11の吸着水分を再生、脱着する。その際、脱着熱を奪われ若干温度が低下し、高温高湿の状態となった後で室内に吸気される(SA)。   Next, the operation of intake and exhaust in the ventilation unit 3 will be described. Exhaust air (RA) from the room to the outside first flows into the exhaust heat exchanger 6 in the exhaust air passage 22, where it is absorbed by the refrigerant and the temperature decreases and the relative humidity increases. Thereafter, the exhaust gas passes through the desiccant rotor 11 and adsorbs and dehumidifies the moisture, and at the same time, the temperature rises due to the heat of adsorption and is exhausted (EA). The intake air (OA) from the outdoor to the indoor is heated by the intake heat exchanger 10 in the intake air passage 21 from a low temperature and low humidity state to be in a high temperature and low humidity state. Thereafter, it flows into the desiccant rotor 11 to regenerate and desorb the adsorbed moisture of the desiccant rotor 11. At that time, desorption heat is deprived and the temperature is slightly lowered, and after a high temperature and high humidity state is reached, the air is taken into the room (SA).

次に、この冷凍空調装置の運転制御動作について説明する。まず、冷房除湿運転の制御動作を図3のフローチャートに基づいて説明する。圧縮機4の容量、室内膨張弁8の開度、室外熱交換器7のファン送風量、室内熱交換器9のファン送風量、換気ユニット3の換気風量が初期値に設定される(ステップS1)。各ファン送風量は初期値設定のまま維持される。室外熱交換器7のファン送風量は、温度センサ14cで検知される外気温度に基づいて設定され、外気温度が低い場合には低風量で運転されるが、外気温度が所定温度よりも高い場合は、基本的に装置の定格風量で運転される。室内熱交換器9のファン送風量、換気ユニット3の換気風量は、装置使用者が設定する風量で運転される。その後、所定の時間が経過すると(ステップS2)、それ以降運転状態に応じた各アクチュエータは以下のように制御される。   Next, the operation control operation of this refrigeration air conditioner will be described. First, the control operation of the cooling and dehumidifying operation will be described based on the flowchart of FIG. The capacity of the compressor 4, the opening degree of the indoor expansion valve 8, the fan air flow rate of the outdoor heat exchanger 7, the fan air flow rate of the indoor heat exchanger 9, and the ventilation air flow rate of the ventilation unit 3 are set to initial values (step S1). ). Each fan blast volume is maintained at the initial value setting. The fan air flow rate of the outdoor heat exchanger 7 is set based on the outside air temperature detected by the temperature sensor 14c. When the outside air temperature is low, the fan is operated with a low air volume, but the outside air temperature is higher than a predetermined temperature. Is basically operated at the rated airflow of the device. The fan air volume of the indoor heat exchanger 9 and the ventilation air volume of the ventilation unit 3 are operated with the air volume set by the user of the apparatus. Thereafter, when a predetermined time elapses (step S2), the actuators corresponding to the operating state are controlled as follows.

まず、圧縮機4の容量は、基本的に室内ユニット2の温度センサ14fで計測される空気温度(室内温度)が、冷凍空調装置使用者が設定する温度になるように制御される。即ち、室内ユニット2の空気温度と設定温度とを比較する(ステップS3)。そして、空気温度が設定温度と等しいか或いは近接している場合には、圧縮機4の容量はそのまま維持されて次のステップに進む。また、空気温度が設定温度より上昇している場合は、圧縮機4の容量は増加され、空気温度が設定温度より低い場合には圧縮機4の容量は減少されるというように圧縮機3の容量を変更する(ステップS4)。   First, the capacity of the compressor 4 is basically controlled so that the air temperature (indoor temperature) measured by the temperature sensor 14f of the indoor unit 2 becomes a temperature set by the user of the refrigeration air conditioner. That is, the air temperature of the indoor unit 2 is compared with the set temperature (step S3). When the air temperature is equal to or close to the set temperature, the capacity of the compressor 4 is maintained as it is, and the process proceeds to the next step. When the air temperature is higher than the set temperature, the capacity of the compressor 4 is increased. When the air temperature is lower than the set temperature, the capacity of the compressor 4 is decreased. The capacity is changed (step S4).

室内膨張弁8は、温度センサ14eで検知される室内熱交換器9の出口温度と圧力センサ15bで検知される冷凍サイクルの低圧を換算して得られる蒸発温度との差温で求められる室内熱交換器9出口の冷媒過熱度(SH)が予め設定された目標値、例えば2℃になるように制御される。即ち、室内熱交換器9出口のSHと目標値とを比較する(ステップS6)。そして、室内熱交換器9出口のSHが目標値と等しいか或いは近接している場合には、室内膨張弁8の開度はそのまま維持されて次のステップに進む。また、室内熱交換器9出口のSHが目標値より大きい場合には、室内膨張弁8の開度は大きく、SHが目標値より小さい場合には、室内膨張弁8の開度は小さく制御されるというように室内膨張弁8の開度を変更する(ステップS7)。   The indoor expansion valve 8 has an indoor heat obtained by a temperature difference between the outlet temperature of the indoor heat exchanger 9 detected by the temperature sensor 14e and the evaporation temperature obtained by converting the low pressure of the refrigeration cycle detected by the pressure sensor 15b. The refrigerant superheat degree (SH) at the outlet of the exchanger 9 is controlled to a preset target value, for example, 2 ° C. That is, the SH at the indoor heat exchanger 9 outlet is compared with the target value (step S6). When the SH at the outlet of the indoor heat exchanger 9 is equal to or close to the target value, the opening of the indoor expansion valve 8 is maintained as it is, and the process proceeds to the next step. When the SH at the outlet of the indoor heat exchanger 9 is larger than the target value, the opening degree of the indoor expansion valve 8 is large, and when the SH is smaller than the target value, the opening degree of the indoor expansion valve 8 is controlled to be small. Thus, the opening degree of the indoor expansion valve 8 is changed (step S7).

次に、暖房加湿運転の制御動作を図4のフローチャートに基づいて説明する。圧縮機4の容量、室内膨張弁8の開度、室外熱交換器7のファン送風量、室内熱交換器9のファン送風量、換気ユニット3の換気風量が初期値に設定される(ステップS8)。各ファン送風量は初期値設定のまま維持される。室外熱交換器7のファン送風量は、温度センサ14cで検知される外気温度に基づいて設定され、外気温度が高い場合には低風量で運転されるが、外気温度が所定温度よりも低い場合は、基本的に装置の定格風量で運転される。室内熱交換器9のファン送風量、換気ユニット3の換気風量は、装置使用者が設定する風量で運転される。その後所定の時間が経過すると(ステップS9)、それ以降運転状態に応じた各アクチュエータは以下のように制御される。   Next, the control operation of the heating and humidifying operation will be described based on the flowchart of FIG. The capacity of the compressor 4, the opening of the indoor expansion valve 8, the fan air flow rate of the outdoor heat exchanger 7, the fan air flow rate of the indoor heat exchanger 9, and the ventilation air flow rate of the ventilation unit 3 are set to initial values (step S8). ). Each fan blast volume is maintained at the initial value setting. The fan air flow rate of the outdoor heat exchanger 7 is set based on the outside air temperature detected by the temperature sensor 14c. When the outside air temperature is high, the fan is operated with a low air volume, but the outside air temperature is lower than a predetermined temperature. Is basically operated at the rated airflow of the device. The fan air volume of the indoor heat exchanger 9 and the ventilation air volume of the ventilation unit 3 are operated with the air volume set by the user of the apparatus. Thereafter, when a predetermined time elapses (step S9), the actuators corresponding to the operating state are controlled as follows.

まず、圧縮機4の容量は、基本的に室内ユニット2の温度センサ14fで計測される空気温度(室内温度)が、冷凍空調装置使用者が設定する温度になるように制御される。即ち、室内ユニット2の空気温度と設定温度とを比較する(ステップS10)。そして、空気温度が設定温度と等しいか或いは近接している場合には、圧縮機4の容量はそのまま維持されて次のステップに進む。また、空気温度が設定温度より低下している場合は、圧縮機4の容量は増加され、空気温度が設定温度より高い場合には圧縮機4の容量は減少されるというように圧縮機3の容量を変更する(ステップS11)。   First, the capacity of the compressor 4 is basically controlled so that the air temperature (indoor temperature) measured by the temperature sensor 14f of the indoor unit 2 becomes a temperature set by the user of the refrigeration air conditioner. That is, the air temperature of the indoor unit 2 is compared with the set temperature (step S10). When the air temperature is equal to or close to the set temperature, the capacity of the compressor 4 is maintained as it is, and the process proceeds to the next step. When the air temperature is lower than the set temperature, the capacity of the compressor 4 is increased. When the air temperature is higher than the set temperature, the capacity of the compressor 4 is decreased. The capacity is changed (step S11).

室内膨張弁8は、圧力センサ15aで検知される冷凍サイクルの高圧を換算して得られる凝縮温度と温度センサ14dで検知される室内熱交換器9の出口温度との差温で求められる室内熱交換器9出口の冷媒過冷却度(SC)が予め設定された目標値、例えば5℃になるように制御される(ステップS12)。即ち、室内熱交換器9出口のSCと目標値とを比較する(ステップS13)。そして、室内熱交換器9出口のSCが目標値と等しいか或いは近接している場合には、室内膨張弁8の開度はそのまま維持されて次のステップに進む。また、室内熱交換器9出口のSCが目標値より大きい場合には、室内膨張弁8の開度は大きく、SCが目標値より小さい場合には、室内膨張弁8の開度は小さく制御されるというように室内膨張弁8の開度を変更する(ステップS14)。   The indoor expansion valve 8 has an indoor heat determined by the difference between the condensation temperature obtained by converting the high pressure of the refrigeration cycle detected by the pressure sensor 15a and the outlet temperature of the indoor heat exchanger 9 detected by the temperature sensor 14d. Control is performed so that the refrigerant supercooling degree (SC) at the outlet of the exchanger 9 becomes a preset target value, for example, 5 ° C. (step S12). That is, the SC at the outlet of the indoor heat exchanger 9 is compared with the target value (step S13). If the SC at the outlet of the indoor heat exchanger 9 is equal to or close to the target value, the opening of the indoor expansion valve 8 is maintained as it is, and the process proceeds to the next step. When the SC at the outlet of the indoor heat exchanger 9 is larger than the target value, the opening degree of the indoor expansion valve 8 is large, and when the SC is smaller than the target value, the opening degree of the indoor expansion valve 8 is controlled to be small. Thus, the opening degree of the indoor expansion valve 8 is changed (step S14).

以上のような構成とすることで、本実施の形態では以下の効果を実現することができる。まず、冷房の空調を行う場合に発生する潜熱負荷、顕熱負荷のうち、潜熱負荷については換気ユニット3にて処理し、室内ユニット2では、顕熱負荷のみに対応する運転が実現できる。空気を冷却する熱交換において、潜熱、顕熱を同時に処理する場合、空気の露点温度以下で冷却する必要があり、冷凍サイクルの動作蒸発温度も同様に低下させる運転が求められるが、本実施の形態では顕熱のみに対応すればよいので、蒸発温度については、露点温度よりも高いが室内空気温度よりも適度に低い温度で運転することができる。従って、蒸発温度は、潜熱、顕熱を同時に処理する場合に比べて高く設定できるため、より高効率の運転を実現できる。   With the configuration as described above, the following effects can be realized in the present embodiment. First, among the latent heat load and sensible heat load generated when air conditioning for cooling is performed, the latent heat load is processed by the ventilation unit 3, and the indoor unit 2 can realize an operation corresponding to only the sensible heat load. In the heat exchange for cooling the air, when processing latent heat and sensible heat at the same time, it is necessary to cool the air below the dew point temperature of the air, and an operation that lowers the operating evaporation temperature of the refrigeration cycle is also required. Since the embodiment only needs to deal with sensible heat, the evaporation temperature can be operated at a temperature that is higher than the dew point temperature but moderately lower than the room air temperature. Therefore, the evaporating temperature can be set higher than in the case where latent heat and sensible heat are processed simultaneously, so that a more efficient operation can be realized.

また、デシカントロータ11での脱着に必要な高温を生成する際に、冷房除湿運転では排気熱交換器6において、暖房加湿運転では吸気熱交換器10において、圧縮機4吐出の冷媒顕熱にて吸排気を昇温し、脱着温度を高くすることができる。そのため冷凍サイクルの高圧側凝縮温度を脱着に必要な温度(60℃〜80℃)にまで上昇する必要が無くなり、凝縮器周囲の空気温度(冷房:外気温度、暖房:室内温度)に見合った凝縮温度(40℃〜50℃程度)で運転可能となる。そのため凝縮温度を、一般の空調機と同様に低くでき、高効率の運転を実現できる。   Further, when generating a high temperature necessary for desorption by the desiccant rotor 11, in the exhaust heat exchanger 6 in the cooling and dehumidifying operation, in the intake heat exchanger 10 in the heating and humidifying operation, the refrigerant sensible heat discharged from the compressor 4 is used. The intake / exhaust temperature can be raised to increase the desorption temperature. Therefore, it is not necessary to raise the high-pressure side condensation temperature of the refrigeration cycle to the temperature required for desorption (60 ° C to 80 ° C), and condensation that matches the air temperature around the condenser (cooling: outside air temperature, heating: indoor temperature). Operation is possible at a temperature (about 40 ° C. to 50 ° C.). Therefore, the condensation temperature can be lowered similarly to a general air conditioner, and high-efficiency operation can be realized.

また、圧縮機4の吸入の冷媒温度を、冷房除湿運転では吸気熱交換器10における吸気の冷却の際に加熱することで、暖房加湿運転では排気熱交換器6における排気の冷却の際に加熱することで、高くすることができる。そのため圧縮機4の吐出温度がより上昇し、凝縮温度が低い条件であっても脱着用の高温空気を生成することができる。一般の空調機で同様に吸入温度を高めて吐出温度を高めようとした場合、蒸発器出口のSHを大きくする必要があり、そのためには冷凍サイクルの動作蒸発温度をより低くする必要があり、効率が低下する運転となる。本実施の形態の場合、低圧側の冷媒の加熱源として、冷房では室内空気と吸気の2つがあり、暖房では室外空気と排気の2つがある。   Further, the refrigerant temperature of the suction of the compressor 4 is heated when cooling the intake air in the intake heat exchanger 10 in the cooling and dehumidifying operation, and is heated when cooling the exhaust gas in the exhaust heat exchanger 6 in the heating and humidifying operation. By doing so, it can be raised. For this reason, the discharge temperature of the compressor 4 is further increased, and high-temperature air for desorption can be generated even under a condition where the condensation temperature is low. Similarly, in the case of a general air conditioner, when the suction temperature is increased to increase the discharge temperature, it is necessary to increase the SH at the outlet of the evaporator, and for that purpose, it is necessary to lower the operating evaporation temperature of the refrigeration cycle, Operation will be less efficient. In the case of the present embodiment, there are two types of heating sources for the refrigerant on the low pressure side: indoor air and intake air for cooling, and outdoor air and exhaust for heating.

冷房除湿運転の場合、室内温度よりも外気温度が一般に高く、吸気の方が高温となる。従って、本実施の形態のように構成することで、冷凍サイクルの動作蒸発温度を室内空気が冷却できるように適切に運転すると同時に、より高温の吸気と冷媒を熱交換させ加熱することで、一般の空調機のような動作蒸発温度の低下がなくても圧縮機4の吸入温度を高めることができる。
暖房加湿運転の場合、外気温度よりも室内温度が一般に高く、排気の方が高温となる。従って、本実施の形態のように構成することで、冷凍サイクルの動作蒸発温度を室外空気から吸熱ができるように適切に運転すると同時に、より高温の排気と冷媒を熱交換させ加熱することで、一般の空調機のような動作蒸発温度の低下がなくても圧縮機4の吸入温度を高めることができる。
以上のように、冷房、暖房のいずれの運転においても高温の熱源により圧縮機4の吸入温度を高める運転となるため、動作蒸発温度を低くする必要がなくなり、高効率の運転が実現される。
In the cooling and dehumidifying operation, the outside air temperature is generally higher than the room temperature, and the intake air has a higher temperature. Therefore, by configuring as in the present embodiment, the operation evaporating temperature of the refrigeration cycle is appropriately operated so that the indoor air can be cooled, and at the same time, heat exchange is performed by heat exchange between the higher-temperature intake air and the refrigerant. The suction temperature of the compressor 4 can be increased even if the operating evaporation temperature does not decrease as in the air conditioner.
In the case of heating / humidifying operation, the room temperature is generally higher than the outside air temperature, and the exhaust becomes higher. Therefore, by configuring as in the present embodiment, the operation evaporating temperature of the refrigeration cycle is appropriately operated so as to be able to absorb heat from the outdoor air, and at the same time, by heat exchange and heating of the higher-temperature exhaust and refrigerant, The suction temperature of the compressor 4 can be increased without a decrease in the operation evaporation temperature as in a general air conditioner.
As described above, in both the cooling and heating operations, the high temperature heat source is used to increase the suction temperature of the compressor 4, so that it is not necessary to lower the operation evaporation temperature, and a highly efficient operation is realized.

また、冷房除湿運転では吸気を冷却することで、冷媒の低圧顕熱側も負荷に対する冷却に用いることができる。そのため、冷凍サイクルにおいて、負荷の冷却に活用される冷媒エンタルピー差をより大きくできる(図2の点4−5間を点4−6間に拡大)。圧縮機4の吸入冷媒の加熱に他の空調負荷に関連しない高温熱源を用いることもできるが、この場合は冷媒顕熱部分のエンタルピー差は冷却作用として機能しないので、エンタルピー差の拡大の無いまま単に高温の媒体を圧縮することになり、圧縮動力のみ増加し、運転効率が低下する。
本実施の形態では、圧縮機4の吸入温度を高めると同時に冷却に作用する冷媒のエンタルピー差も拡大しているので、運転効率の低下が小さく、圧縮機4の吸入温度、吐出温度を高めることができ、より高効率の運転を実現できる。
Further, by cooling the intake air in the cooling and dehumidifying operation, the low-pressure sensible heat side of the refrigerant can also be used for cooling the load. Therefore, in the refrigeration cycle, the refrigerant enthalpy difference utilized for cooling the load can be further increased (between points 4-5 in FIG. 2 and enlarged between points 4-6). Although a high-temperature heat source that is not related to other air conditioning loads can be used for heating the refrigerant sucked in the compressor 4, in this case, the enthalpy difference in the refrigerant sensible heat portion does not function as a cooling action, so that the enthalpy difference does not increase. The high temperature medium is simply compressed, and only the compression power is increased, and the operation efficiency is lowered.
In the present embodiment, since the enthalpy difference of the refrigerant that acts on cooling is increased at the same time as the suction temperature of the compressor 4 is increased, the reduction in operating efficiency is small, and the suction temperature and discharge temperature of the compressor 4 are increased. And more efficient operation can be realized.

なお、本実施の形態では室内ユニット2が1台の場合を示したが、室内ユニット2が複数台であっても同様の効果を得ることができる。   In the present embodiment, the case where there is one indoor unit 2 is shown, but the same effect can be obtained even when there are a plurality of indoor units 2.

また、室内膨張弁8は室外熱交換器7と室内熱交換器9の間の冷媒配管にあれば同様の機能を実現できるので、配置は室内ユニット2内に限定されるものではなく、例えば室外ユニット1内に配置してもよい。   Moreover, since the indoor expansion valve 8 can implement | achieve the same function if it exists in the refrigerant | coolant piping between the outdoor heat exchanger 7 and the indoor heat exchanger 9, arrangement | positioning is not limited in the indoor unit 2, For example, outdoor It may be arranged in the unit 1.

また、吸気熱交換器10は、吸気風路21のデシカントロータ11の上流側に配置しているが、デシカントロータ11の下流側に追加して配置してもよい。デシカントロータ11の下流側の吸気温度は、冷房除湿運転時に吸着される際の吸着熱により昇温し、上流側温度よりも高くなるので、ここの空気と熱交換することで、より圧縮機4の吸入温度、吐出温度を高めることができ、脱着のための空気温度を高め、除湿量を多くすることができる。   In addition, the intake heat exchanger 10 is disposed on the upstream side of the desiccant rotor 11 in the intake air passage 21, but may be additionally disposed on the downstream side of the desiccant rotor 11. The intake air temperature on the downstream side of the desiccant rotor 11 is raised by the heat of adsorption when adsorbed during the cooling and dehumidifying operation, and becomes higher than the upstream side temperature. Therefore, by exchanging heat with the air here, the compressor 4 The intake temperature and discharge temperature can be increased, the air temperature for desorption can be increased, and the amount of dehumidification can be increased.

なお、室内膨張弁8の制御目標値を室内湿度の制御状況に応じて変更してもよい。例えば、制御目標値を圧縮機4の吐出温度とし、吐出温度の制御目標値を室内の湿度状況によって変更する。冷房除湿運転において、湿度センサ13で検知される室内湿度が装置使用者の設定湿度より高い場合は、吐出温度の制御目標値を高く設定し、逆に湿度センサ13で検知される室内湿度が装置使用者の設定湿度より低い場合は、吐出温度の制御目標値を低く設定する。吐出温度が高く運転されると、排気熱交換器6の冷媒温度が高温になり、排気熱交換器6出口の排気がより高温となり、デシカントロータ11における脱着が促進され除湿量が増加する。それにより室内湿度を低くでき、装置使用者の設定湿度に近づけることができる。逆に吐出温度が低く運転されると、排気熱交換器6の冷媒温度が低温になり、排気熱交換器6出口の排気がより低温となり除湿量が減少する。それにより室内湿度を高くでき、装置使用者の設定湿度に近づけることができる。   In addition, you may change the control target value of the indoor expansion valve 8 according to the control condition of indoor humidity. For example, the control target value is set as the discharge temperature of the compressor 4, and the control target value of the discharge temperature is changed according to the humidity state in the room. In the cooling and dehumidifying operation, when the indoor humidity detected by the humidity sensor 13 is higher than the set humidity of the apparatus user, the control target value of the discharge temperature is set high, and conversely, the indoor humidity detected by the humidity sensor 13 is When the humidity is lower than the user's set humidity, the control target value of the discharge temperature is set low. When the discharge temperature is high, the refrigerant temperature of the exhaust heat exchanger 6 becomes high, the exhaust at the outlet of the exhaust heat exchanger 6 becomes higher, the desorption in the desiccant rotor 11 is promoted, and the dehumidification amount increases. Thereby, indoor humidity can be made low and it can approach the humidity set by the user of the apparatus. Conversely, when the discharge temperature is operated low, the refrigerant temperature of the exhaust heat exchanger 6 becomes low, the exhaust at the outlet of the exhaust heat exchanger 6 becomes lower, and the dehumidification amount decreases. Thereby, indoor humidity can be made high and it can approach the apparatus user's setting humidity.

また、暖房加湿運転においては、湿度センサ13で検知される室内湿度が装置使用者の設定湿度より低い場合は、吐出温度の制御目標値を高く設定し、逆に湿度センサ13で検知される室内湿度が装置使用者の設定湿度より高い場合は、吐出温度の制御目標値を低く設定する。吐出温度が高く運転されると、吸気熱交換器10の冷媒温度が高温になり、吸気熱交換器10出口の吸気がより高温となり、デシカントロータ11における脱着が促進され加湿量が増加する。それにより室内湿度を高くでき、装置使用者の設定湿度に近づけることができる。逆に吐出温度が低く運転されると、吸気熱交換器10の冷媒温度が低温になり、吸気熱交換器10出口の吸気がより低温となり加湿量が減少する。それにより室内湿度を低くでき、装置使用者の設定湿度に近づけることができる。   Further, in the heating and humidifying operation, when the indoor humidity detected by the humidity sensor 13 is lower than the humidity set by the user of the apparatus, the control target value of the discharge temperature is set high, and conversely the indoor detected by the humidity sensor 13. When the humidity is higher than the humidity set by the apparatus user, the control target value of the discharge temperature is set low. When the operation is performed at a high discharge temperature, the refrigerant temperature of the intake heat exchanger 10 becomes high, the intake air at the outlet of the intake heat exchanger 10 becomes higher, the desorption in the desiccant rotor 11 is promoted, and the humidification amount increases. Thereby, indoor humidity can be made high and it can approach the apparatus user's setting humidity. Conversely, when the discharge temperature is operated low, the refrigerant temperature of the intake heat exchanger 10 becomes low, the intake air at the outlet of the intake heat exchanger 10 becomes lower, and the humidification amount decreases. Thereby, indoor humidity can be made low and it can approach the humidity set by the user of the apparatus.

吐出温度に応じた室内膨張弁8の制御方法は、冷房除湿運転、暖房加湿運転とも同様に実施され、温度センサ14aで測定される吐出温度が目標値より低い場合には、室内膨張弁8の開度を小さく制御し、吐出温度が目標値より高い場合には、室内膨張弁8の開度を大きく制御する。   The control method of the indoor expansion valve 8 according to the discharge temperature is performed in the same way for both the cooling and dehumidifying operation and the heating and humidifying operation. When the discharge temperature measured by the temperature sensor 14a is lower than the target value, the indoor expansion valve 8 is controlled. The opening degree is controlled to be small, and when the discharge temperature is higher than the target value, the opening degree of the indoor expansion valve 8 is controlled to be large.

このような運転制御とすることにより、室内の湿度を使用者の設定通りに動作させることができ、快適な空調を実現することができる。また、除加湿量が少なくてもよい条件では圧縮機4の吸入温度を低下させる運転となる。圧縮機4の吸入温度が低いほど、冷媒流量あたりの圧縮動力が少なくなるので、湿度負荷が低い条件では吸入温度を低下させる運転を行うことで、より高効率の運転を行うことができる。   By setting it as such operation control, indoor humidity can be operated according to a user's setting, and comfortable air conditioning can be realized. Further, under the condition that the dehumidifying / humidifying amount may be small, the operation is performed to lower the intake temperature of the compressor 4. The lower the suction temperature of the compressor 4, the smaller the compression power per refrigerant flow rate. Therefore, a higher efficiency operation can be performed by performing an operation that lowers the intake temperature under a low humidity load condition.

なお、湿度制御のための制御目標値は圧縮機4の吐出温度の他に、脱着側風路の空気温度、冷房除湿運転では温度センサ14gで測定される排気温度、暖房加湿運転では温度センサ14hで測定される吸気温度としてもよい。除加湿量を増加させる場合は各温度の制御目標値を高く設定し、減少させる場合は目標値を低く設定する。各温度を上昇させるには、圧縮機4の吐出温度を高く運転するので、室内膨張弁8の開度を小さく制御し、各温度を低下させるには、室内膨張弁8の開度を大きく制御する。これにより前述した吐出温度を用いた運転と同様の運転を実現でき、同様の効果を得ることができる。   In addition to the discharge temperature of the compressor 4, the control target value for humidity control includes the air temperature of the desorption side air passage, the exhaust temperature measured by the temperature sensor 14g in the cooling and dehumidifying operation, and the temperature sensor 14h in the heating and humidifying operation. It may be the intake air temperature measured at. When the dehumidification / humidification amount is increased, the control target value for each temperature is set high, and when it is decreased, the target value is set low. In order to raise each temperature, since the discharge temperature of the compressor 4 is operated high, the opening degree of the indoor expansion valve 8 is controlled to be small, and to lower each temperature, the opening degree of the indoor expansion valve 8 is controlled to be large. To do. Thereby, the same operation as the operation using the discharge temperature described above can be realized, and the same effect can be obtained.

また、湿度制御のための制御目標値として圧縮機4の吸入温度を用いても良い。吐出温度と吸入温度の高低は正の相関を持って変動するので、吐出温度を用いる場合と同様の制御を行うことで、同様の運転を実現でき、同様の効果を得ることができる。   Further, the suction temperature of the compressor 4 may be used as a control target value for humidity control. Since the levels of the discharge temperature and the suction temperature fluctuate with a positive correlation, the same operation can be realized and the same effect can be obtained by performing the same control as in the case of using the discharge temperature.

なお、本実施の形態では上記の運転を連続的に実施することができる。従って、冷媒回路の切り替えにより吸脱着機能を切り替える運転を実施する場合に比べて、空調状態をより安定的に実現でき、空調運転の快適性を向上させることができる。   In the present embodiment, the above operation can be continuously performed. Therefore, the air-conditioning state can be realized more stably and the comfort of the air-conditioning operation can be improved as compared with the case of performing the operation of switching the adsorption / desorption function by switching the refrigerant circuit.

実施の形態2.
本発明の実施の形態2に係る冷凍空調装置の構成を図5に基づいて説明する。図5において、流量制御弁16が室外ユニット1内に設けられる。流量制御弁16は開度可変の弁であり、吸気熱交換器10に至る冷媒流路をバイパスするバイパス回路17に設けられる。即ち、室内熱交換器9と四方弁5との中間部をバイパスするバイパス回路17を設け、バイパス回路17に流量制御弁16を設けるものである。図5の他の記号については、実施の形態1と同じものを表す。
Embodiment 2. FIG.
A configuration of the refrigerating and air-conditioning apparatus according to Embodiment 2 of the present invention will be described with reference to FIG. In FIG. 5, a flow control valve 16 is provided in the outdoor unit 1. The flow control valve 16 is a valve having a variable opening, and is provided in a bypass circuit 17 that bypasses the refrigerant flow path leading to the intake heat exchanger 10. That is, a bypass circuit 17 that bypasses an intermediate portion between the indoor heat exchanger 9 and the four-way valve 5 is provided, and a flow rate control valve 16 is provided in the bypass circuit 17. Other symbols in FIG. 5 are the same as those in the first embodiment.

流量制御弁16では、計測制御装置12の指令により、室内の調湿状況に応じて吸気熱交換器10を流れる冷媒流量を制御する。すなわち、湿度センサ13で計測される湿度と装置使用者が予め設定する湿度目標値を比較し、冷房除湿運転において室内湿度が低い場合、もしくは暖房加湿運転において室内湿度が高い場合に、流量制御弁16の開度を大きく制御し、吸気熱交換器10のバイパス回路17を流れる冷媒流量を増加させる。これらの運転状況では、デシカントロータ11による水分移動量が必要量よりも多い状況であり、冷房除湿運転では除湿量過多に、暖房加湿運転では加湿量過多の状態となっている。そこで、デシカントロータ11による水分移動量を抑制するため、吸気熱交換器10に流れる冷媒流量を減少させる運転を行う。   The flow rate control valve 16 controls the flow rate of the refrigerant flowing through the intake heat exchanger 10 in accordance with the humidity control condition in the room, according to a command from the measurement control device 12. That is, the flow rate control valve is compared when the humidity measured by the humidity sensor 13 is compared with a humidity target value preset by the user of the apparatus and the room humidity is low in the cooling and dehumidifying operation or the room humidity is high in the heating and humidifying operation. The opening degree of 16 is largely controlled, and the flow rate of the refrigerant flowing through the bypass circuit 17 of the intake heat exchanger 10 is increased. In these operating conditions, the amount of moisture transferred by the desiccant rotor 11 is larger than the necessary amount, and the dehumidifying operation is in an excessive amount of dehumidification, and the heating and humidifying operation is in an excessive amount of humidification. Therefore, in order to suppress the amount of moisture movement by the desiccant rotor 11, an operation for decreasing the flow rate of the refrigerant flowing in the intake heat exchanger 10 is performed.

吸気熱交換器10の冷媒流量の低下に伴い、以下のような運転が実施される。冷房除湿運転では、吸気熱交換器10の熱交換量が減少し、圧縮機4の吸入温度が低下し、吐出温度が低下する。それにより、排気熱交換器6での排気の加熱量が低下し、デシカントロータ11の脱着温度が低下し、デシカントロータ11における水分移動量が低下し、除湿量が低減される。暖房加湿運転では、吸気熱交換器10の熱交換量が減少し、デシカントロータ11の脱着温度が低下し、デシカントロータ11における水分移動量が低下し、加湿量が低減される。   As the refrigerant flow rate of the intake heat exchanger 10 decreases, the following operation is performed. In the cooling and dehumidifying operation, the heat exchange amount of the intake heat exchanger 10 decreases, the intake temperature of the compressor 4 decreases, and the discharge temperature decreases. Thereby, the heating amount of the exhaust gas in the exhaust heat exchanger 6 decreases, the desorption temperature of the desiccant rotor 11 decreases, the amount of moisture movement in the desiccant rotor 11 decreases, and the dehumidification amount is reduced. In the heating and humidifying operation, the heat exchange amount of the intake heat exchanger 10 is reduced, the desorption temperature of the desiccant rotor 11 is lowered, the moisture movement amount in the desiccant rotor 11 is lowered, and the humidification amount is reduced.

逆に、流量制御弁16の冷媒流量を減少させると、吸気熱交換器10での熱交換量を増加でき、デシカントロータ11による水分移動量を増加させ、冷房除湿運転での除湿量や暖房加湿運転での加湿量を増加させることができる。そこで、冷房除湿運転において室内湿度が高い場合、もしくは暖房加湿運転において室内湿度が低い場合は、流量制御弁16の開度を小さく制御し、吸気熱交換器10を流れる冷媒流量を増加させる制御を実施する。   Conversely, if the refrigerant flow rate of the flow rate control valve 16 is decreased, the heat exchange amount in the intake heat exchanger 10 can be increased, the moisture transfer amount by the desiccant rotor 11 is increased, and the dehumidification amount and heating humidification in the cooling and dehumidifying operation are increased. The amount of humidification during operation can be increased. Therefore, when the indoor humidity is high in the cooling and dehumidifying operation, or when the indoor humidity is low in the heating and humidifying operation, the opening of the flow control valve 16 is controlled to be small, and the flow rate of the refrigerant flowing through the intake heat exchanger 10 is increased. carry out.

このような運転制御とすることにより、室内の湿度を使用者の設定通りに動作させることができ、快適な空調を実現することができる。また、冷房除湿運転では、室内の調湿状況に応じて、適宜脱着に用いられる排気の温度を調整し、圧縮機4の吸入温度を変更するので、除湿量が少なくてもよい条件では圧縮機4の吸入温度を低下させた運転となる。圧縮機4の吸入温度が低いほど、冷媒流量あたりの圧縮動力が少なくなるので、高効率の運転となる。従って、常に一定の脱着温度、即ち圧縮機4の吸入温度が一定で運転される場合に比べて、低負荷条件では吸入温度を低下させる運転を行うことができ、より高効率の運転を行うことができる。   By setting it as such operation control, indoor humidity can be operated according to a user's setting, and comfortable air conditioning can be realized. Further, in the cooling and dehumidifying operation, the temperature of the exhaust gas used for desorption is appropriately adjusted according to the humidity control condition in the room and the suction temperature of the compressor 4 is changed. 4 is operated with the suction temperature lowered. The lower the suction temperature of the compressor 4, the lower the compression power per refrigerant flow rate, and thus the higher the efficiency of operation. Therefore, compared with the case where the operation is always performed with a constant desorption temperature, that is, with the intake temperature of the compressor 4 being constant, the operation of lowering the intake temperature can be performed under a low load condition, and a more efficient operation can be performed. Can do.

なお、暖房加湿運転において、吸気熱交換器10を流れる冷媒量を増加させ、吸気熱交換器10での熱交換量を増加させると、その分冷媒の冷却が進み、室内熱交換器9に流入する冷媒エンタルピー(図2の点2のエンタルピー)が低くなり、室内熱交換器9での熱交換量が低下し、室内を加熱する能力が低下する。そこで、室内温湿度の制御状況に応じて、流量制御弁16の開度制御を変更してもよい。   In the heating / humidifying operation, if the amount of refrigerant flowing through the intake heat exchanger 10 is increased and the amount of heat exchange in the intake heat exchanger 10 is increased, cooling of the refrigerant proceeds correspondingly and flows into the indoor heat exchanger 9. Refrigerant enthalpy (enthalpy at point 2 in FIG. 2) is reduced, the amount of heat exchange in the indoor heat exchanger 9 is reduced, and the ability to heat the room is reduced. Therefore, the opening degree control of the flow control valve 16 may be changed according to the control state of the indoor temperature and humidity.

室内温度が設定温度よりも所定値以上低い場合、例えば装置使用開始時で室内空間が冷えている場合は、快適性向上のためにはまず室内温度の上昇が優先される。そこでこのような場合には、流量制御弁16の開度は全開とし、ほとんどの冷媒流量が吸気熱交換器10をバイパスするように運転する。そして室内温度と設定温度との偏差が所定値以下となった状態で、室内湿度状況に応じた流量制御弁16の開度制御を開始する。これにより、室内空間を加熱する能力が増加し、室内温度上昇が促進され快適性の高い運転が実現できる。   When the indoor temperature is lower than the set temperature by a predetermined value or more, for example, when the indoor space is cold at the start of use of the apparatus, the increase in the indoor temperature is given priority to improve comfort. Therefore, in such a case, the opening degree of the flow control valve 16 is fully opened, and the operation is performed so that most of the refrigerant flow bypasses the intake heat exchanger 10. Then, in a state where the deviation between the room temperature and the set temperature is equal to or less than a predetermined value, the opening control of the flow control valve 16 according to the room humidity state is started. Thereby, the ability to heat indoor space increases, the indoor temperature rise is accelerated | stimulated, and driving | operation with high comfort is realizable.

実施の形態3.
本発明の実施の形態3の冷凍空調装置の構成を図6に基づいて説明する。図6において流量制御弁16が室外ユニット1内に設けられる。流量制御弁16は開度可変の弁であり、排気熱交換器6に至る冷媒流路をバイパスするバイパス回路18に設けられる。即ち、四方弁5と室外熱交換器7との中間部をバイパスするバイパス回路18を設け、バイパス回路18に流量制御弁16を設けるものである。図6の他の記号については、実施の形態1と同じものを表す。
Embodiment 3 FIG.
The configuration of the refrigerating and air-conditioning apparatus according to Embodiment 3 of the present invention will be described with reference to FIG. In FIG. 6, a flow control valve 16 is provided in the outdoor unit 1. The flow control valve 16 is a variable opening valve and is provided in a bypass circuit 18 that bypasses the refrigerant flow path leading to the exhaust heat exchanger 6. That is, a bypass circuit 18 that bypasses an intermediate portion between the four-way valve 5 and the outdoor heat exchanger 7 is provided, and the flow rate control valve 16 is provided in the bypass circuit 18. The other symbols in FIG. 6 are the same as those in the first embodiment.

流量制御弁16では、計測制御装置12の指令により、室内の調湿状況に応じて排気熱交換器6を流れる冷媒流量を制御する。即ち、湿度センサ13で計測される湿度と装置使用者が予め設定する湿度目標値を比較し、冷房除湿運転において室内湿度が低い場合、もしくは暖房加湿運転において室内湿度が高い場合に、流量制御弁16の開度を大きく制御し、排気熱交換器6のバイパス回路18を流れる冷媒流量を増加させる。これらの運転状況では、デシカントロータ11による水分移動量が必要量よりも多い状況であり、冷房除湿運転では除湿量過多に、暖房加湿運転では加湿量過多の状態となっている。そこで、デシカントロータ11による水分移動量を抑制するため、排気熱交換器6に流れる冷媒流量を減少させる運転を行う。   The flow rate control valve 16 controls the flow rate of the refrigerant flowing through the exhaust heat exchanger 6 according to the humidity control condition in the room according to a command from the measurement control device 12. That is, the flow rate control valve is compared when the humidity measured by the humidity sensor 13 and the humidity target value preset by the user of the apparatus are compared and the room humidity is low in the cooling and dehumidifying operation or the room humidity is high in the heating and humidifying operation. The opening degree of 16 is largely controlled, and the flow rate of the refrigerant flowing through the bypass circuit 18 of the exhaust heat exchanger 6 is increased. In these operating conditions, the amount of moisture transferred by the desiccant rotor 11 is larger than the necessary amount, and the dehumidifying operation is in an excessive amount of dehumidification, and the heating and humidifying operation is in an excessive amount of humidification. Therefore, in order to suppress the amount of moisture movement by the desiccant rotor 11, an operation for reducing the flow rate of the refrigerant flowing in the exhaust heat exchanger 6 is performed.

排気熱交換器6の冷媒流量の低下に伴い、以下のような運転が実施される。暖房加湿運転では、排気熱交換器6の熱交換量が減少し、圧縮機4の吸入温度が低下し、吐出温度が低下する。それにより、吸気熱交換器10での吸気の加熱量が低下し、デシカントロータ11の脱着温度が低下し、デシカントロータ11における水分移動量が低下し、加湿量が低減される。冷房除湿運転では、排気熱交換器6の熱交換量が減少し、デシカントロータ11の脱着温度が低下し、デシカントロータ11における水分移動量が低下し、除湿量が低減される。   As the refrigerant flow rate of the exhaust heat exchanger 6 decreases, the following operation is performed. In the heating and humidifying operation, the heat exchange amount of the exhaust heat exchanger 6 decreases, the suction temperature of the compressor 4 decreases, and the discharge temperature decreases. Thereby, the heating amount of the intake air in the intake heat exchanger 10 is reduced, the desorption temperature of the desiccant rotor 11 is reduced, the moisture movement amount in the desiccant rotor 11 is reduced, and the humidification amount is reduced. In the cooling and dehumidifying operation, the heat exchange amount of the exhaust heat exchanger 6 is reduced, the desorption temperature of the desiccant rotor 11 is lowered, the moisture transfer amount in the desiccant rotor 11 is lowered, and the dehumidification amount is reduced.

逆に、流量制御弁16の冷媒流量を減少させると、排気熱交換器6での熱交換量を増加でき、デシカントロータ11による水分移動量を増加させ、冷房除湿運転での除湿量や暖房加湿運転での加湿量を増加させることができる。そこで、冷房除湿運転において室内湿度が高い場合、もしくは暖房加湿運転において室内湿度が低い場合は、流量制御弁16の開度を小さく制御し、排気熱交換器6を流れる冷媒流量を増加させる制御を実施する。   Conversely, if the refrigerant flow rate of the flow control valve 16 is decreased, the heat exchange amount in the exhaust heat exchanger 6 can be increased, the moisture transfer amount by the desiccant rotor 11 is increased, and the dehumidification amount and heating humidification in the cooling and dehumidifying operation are increased. The amount of humidification during operation can be increased. Therefore, when the indoor humidity is high in the cooling and dehumidifying operation, or when the indoor humidity is low in the heating and humidifying operation, the opening of the flow control valve 16 is controlled to be small, and the flow rate of the refrigerant flowing through the exhaust heat exchanger 6 is increased. carry out.

このような運転制御とすることにより、室内の湿度を使用者の設定通りに動作させることができ、快適な空調を実現することができる。   By setting it as such operation control, indoor humidity can be operated according to a user's setting, and comfortable air conditioning can be realized.

本発明の実施の形態1に係る冷凍空調装置の構成図である。1 is a configuration diagram of a refrigeration air conditioner according to Embodiment 1 of the present invention. 実施の形態1に係る冷凍空調装置の動作を示すp−h線図である。It is a ph diagram which shows operation | movement of the refrigeration air conditioning apparatus which concerns on Embodiment 1. FIG. 実施の形態1に係る冷凍空調装置の冷房除湿運転の運転制御フローチャートを表す図である。It is a figure showing the operation control flowchart of the air_conditioning | cooling dehumidification driving | operation of the refrigerating air conditioning apparatus which concerns on Embodiment 1. FIG. 実施の形態1に係る冷凍空調装置の暖房加湿運転の運転制御フローチャートを表す図である。It is a figure showing the operation control flowchart of the heating humidification driving | operation of the refrigerating air conditioning apparatus which concerns on Embodiment 1. FIG. 実施の形態2に係る冷凍空調装置の構成図である。It is a block diagram of the refrigerating and air-conditioning apparatus according to Embodiment 2. 実施の形態3に係る冷凍空調装置の構成図である。It is a block diagram of the refrigeration air conditioning apparatus which concerns on Embodiment 3. FIG.

符号の説明Explanation of symbols

1 室外ユニット、2 室内ユニット、3 換気ユニット、4 圧縮機、5 四方弁、6 排気熱交換器、7 室外熱交換器、8 室内膨張弁、9 室内熱交換器、10 吸気熱交換器、11 デシカントロータ、12 計測制御装置、13 湿度センサ、14a、b、c、d、e、f、g、h 温度センサ、15a、b 圧力センサ、16 流量制御弁、17、18 バイパス回路、21 吸気風路、22 排気風路。   1 outdoor unit, 2 indoor unit, 3 ventilation unit, 4 compressor, 5 four-way valve, 6 exhaust heat exchanger, 7 outdoor heat exchanger, 8 indoor expansion valve, 9 indoor heat exchanger, 10 intake heat exchanger, 11 Desiccant rotor, 12 Measurement control device, 13 Humidity sensor, 14a, b, c, d, e, f, g, h Temperature sensor, 15a, b Pressure sensor, 16 Flow control valve, 17, 18 Bypass circuit, 21 Intake air Road, 22 Exhaust air path.

Claims (4)

圧縮機、四方弁、室外熱交換器、減圧装置、室内熱交換器を含む冷凍サイクルを構成する冷媒回路と、
室内と室外の間で換気を行うための吸気風路、排気風路と、
吸気風路と排気風路とを流れる空気中の水分を吸脱着作用にて移動するデシカントロータと、
吸気風路にデシカントロータより上流側に配置された吸気熱交換器と、
排気風路にデシカントロータより上流側に配置された排気熱交換器とを備え、
前記冷媒回路が、前記四方弁と前記室外熱交換器との中間部を前記排気熱交換器に接続するとともに、前記室内熱交換器と前記四方弁との中間部を前記吸気熱交換器に接続する構成となっていることを特徴とする冷凍空調装置。
A refrigerant circuit constituting a refrigeration cycle including a compressor, a four-way valve, an outdoor heat exchanger, a decompressor, and an indoor heat exchanger;
Intake and exhaust air passages for ventilation between indoors and outdoors,
A desiccant rotor that moves moisture in the air flowing through the intake air flow path and the exhaust air flow path by adsorption and desorption;
An intake heat exchanger disposed upstream of the desiccant rotor in the intake air passage;
An exhaust heat exchanger disposed upstream of the desiccant rotor in the exhaust air passage;
The refrigerant circuit connects an intermediate portion between the four-way valve and the outdoor heat exchanger to the exhaust heat exchanger, and connects an intermediate portion between the indoor heat exchanger and the four-way valve to the intake heat exchanger. A refrigerating and air-conditioning apparatus, characterized in that
前記吸気熱交換器に接続される前記室内熱交換器と前記四方弁との中間部をバイパスするバイパス回路を設け、このバイパス回路に流量制御弁を設けたことを特徴とする請求項1記載の冷凍空調装置。   The bypass circuit which bypasses an intermediate part of the indoor heat exchanger connected to the intake heat exchanger and the four-way valve is provided, and a flow rate control valve is provided in the bypass circuit. Refrigeration air conditioner. 前記排気熱交換器に接続される前記四方弁と前記室外熱交換器との中間部をバイパスするバイパス回路を設け、このバイパス回路に流量制御弁を設けたことを特徴とする請求項1記載の冷凍空調装置。   The bypass circuit which bypasses the intermediate part of the said four-way valve connected to the said exhaust heat exchanger and the said outdoor heat exchanger was provided, and the flow control valve was provided in this bypass circuit. Refrigeration air conditioner. 冷凍空調装置の計測制御を実施する制御装置を備え、制御装置にて室内の調湿状況に応じて前記流量制御弁の開度を制御し、前記バイパス回路を流れる冷媒流量を制御することを特徴とする請求項2または3記載の冷凍空調装置。   A control device that performs measurement control of the refrigerating and air-conditioning apparatus is provided, and the control device controls the opening of the flow control valve in accordance with the humidity control condition in the room to control the flow rate of refrigerant flowing through the bypass circuit. The refrigeration air conditioner according to claim 2 or 3.
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