【特許請求の範囲】
【請求項１】 二酸化炭素を含む冷媒を圧縮する圧縮機と、水サイクルを循環する水と前記冷媒との間で熱交換を行う冷媒水熱交換器と、前記圧縮された冷媒を減圧可能な第１の減圧器と、前記第１の減圧器を経由した冷媒と第１の空気とで熱交換を行う第１の熱交換器と、前記第１の熱交換器で熱交換された冷媒と前記圧縮機に吸引される冷媒とで熱交換を行う内部熱交換器と、前記内部熱交換器で熱交換された冷媒を減圧する第２の減圧器と、前記第２の減圧器で減圧された冷媒と第２の空気とを熱交換する第２の熱交換器と、前記内部熱交換器とを順次接続した冷媒サイクルと、
前記水を加熱する動力機関と、前記冷媒水熱交換器と、前記第２の熱交換器より前記第２の空気の流れの下流側に配置されたヒータコアと、ラジエータとを順次接続した前記水サイクルとを備え、
暖房除湿時には、第２の減圧器の開度を調整することにより、空調能力を調整する冷凍サイクル装置。
【請求項２】 前記暖房除湿時の第２の減圧器の開度の調整は、前記圧縮機の吐出温度を計測し、設定吐出温度と前記計測された吐出温度を比較して、前記計測された吐出温度が前記設定吐出温度以上の時は前記第２の減圧器の開度を大きくし、前記計測された吐出温度が前記設定吐出温度よりも小さいときは前記第２の減圧器の開度を小さくすることによって行われる請求項１記載の冷凍サイクル装置。
【請求項３】 前記第１の熱交換器の入口と出口とを第３の開閉弁を介して接続する第３のバイパス回路を備えた請求項１記載の冷凍サイクル装置。
【請求項４】 前記第１の熱交換器の入口に第４の開閉弁を備えた請求項１記載の冷凍サイクル装置。
【請求項５】 前記冷媒水熱交換器出口と前記第１の減圧器との間に第５の開閉弁と、
前記第１の熱交換器出口と前記内部熱交換器入口の間に第１の３方弁と、
前記冷媒水熱交換器出口と前記第５の開閉弁入口との間を一端とし、前記第１の３方弁を他端として接続する第４のバイパス回路と、
前記内部熱交換器出口と前記第２の減圧器入口の間に第２の３方弁と、
前記第２の３方弁を一端とし、前記第５の開閉弁出口と前記第１の減圧器入口の間を他端として接続する第５のバイパス回路と、
前記第１の熱交換器出口と前記第１の３方弁との間を一端とし、前記第２の３方弁と第２の減圧器との間を他端として第６の開閉弁を介して接続する第６のバイパス回路と、
前記冷媒水熱交換器から流出した冷媒が、前記第５の開閉弁を介して循環する定常モードと、前記第４のバイパス回路と前記第５のバイパス回路を循環する起動モードとを選択的に切替える冷媒循環モード切替手段とを備えた請求項１記載の冷凍サイクル装置。
【請求項６】 前記暖房除湿時の第２の減圧器の開度の調整は、前記第２の熱交換器の冷媒温度Ｔｅｖａを計測し、設定冷媒温度Ｔｘｅｖａと前記計測された冷媒温度Ｔｅｖａを比較して、前記計測された冷媒温度Ｔｅｖａが前記設定冷媒温度Ｔｘｅｖａ以上の時は前記第２の減圧器の開度を小さくし、前記計測された冷媒温度Ｔｅｖａが前記設定冷媒温度Ｔｘｅｖａよりも小さいときは前記第２の減圧器の開度を大きくすることによって行われる請求項１記載の冷凍サイクル装置。
【請求項７】 暖房除湿時には、さらに、第１の減圧器の開度を調整することにより、空調能力を調整する請求項１記載の冷凍サイクル装置。
【請求項８】 前記暖房除湿時の第１の減圧器の開度の調整は、
前記第１の熱交換器の冷媒温度Ｔｍを計測し、設定冷媒温度Ｔｘｍと前記計測された冷媒温度Ｔｍを比較して、前記計測された冷媒温度Ｔｍが前記設定冷媒温度Ｔｘｍ以上の時は前記第１の減圧器の開度を小さくし、前記計測された冷媒温度Ｔｍが前記設定冷媒温度Ｔｘｍよりも小さいときは前記第１の減圧器の開度を大きくし、
前記第２の熱交換器の冷媒温度Ｔｅｖａを計測し、設定冷媒温度Ｔｘｅｖａと前記計測された冷媒温度Ｔｅｖａを比較して、前記計測された冷媒温度Ｔｅｖａが前記設定冷媒温度Ｔｘｅｖａ以上の時は前記第１の減圧器の開度を小さくし、前記計測された冷媒温度Ｔｅｖａが前記設定冷媒温度Ｔｘｅｖａよりも小さいときは前記第１の減圧器の開度を大きくすることによって行われる請求項７記載の冷凍サイクル装置。
【請求項９】 前記ヒータコアを介して吹出される吹出し空気温度を検出する吹出し空気温度検出手段と、
前記圧縮機の運転周波数を制御する圧縮機運転周波数制御手段とを備え、
前記圧縮機運転周波数制御手段は、検出された前記空気温度に基づいて前記圧縮機の運転周波数を制御する請求項１記載の冷凍サイクル装置。
【請求項１０】 前記圧縮機の吐出冷媒温度を検出する吐出冷媒温度検出手段と、
前記第２の熱交換器出口と前記圧縮機の入口を開閉弁を介してバイパスするバイパス回路とを備え、
前記開閉弁は検出された前記吐出冷媒温度に基づいてその開閉が制御される請求項１記載の冷凍サイクル装置。
【請求項１１】 車両用空調装置として用いられる請求項１記載の冷凍サイクル装置。
[Claim of claim]
[Claim 1] Compress refrigerant containing carbon dioxideA compressor,Heat exchange between the water circulating in the water cycle and the refrigerantRefrigerant water heat exchanger,Depressurize the compressed refrigerantA first pressure reducer,Heat exchange is performed between the refrigerant that has passed through the first pressure reducer and the first airA first heat exchanger,An internal heat exchanger performing heat exchange between the refrigerant heat-exchanged in the first heat exchanger and a refrigerant drawn into the compressor, and depressurizing the refrigerant heat-exchanged in the internal heat exchangerA second pressure reducer,Heat exchange between the refrigerant decompressed by the second decompressor and the second airA second heat exchanger,SaidInternal heat exchangerAnd a refrigerant cycle in which
The water in which a power engine for heating the water, the refrigerant water heat exchanger, a heater core disposed downstream of the second air flow from the second heat exchanger, and a radiator are sequentially connectedEquipped with a cycle,
During heating and dehumidification, adjust the air conditioning capacity by adjusting the opening degree of the second pressure reducerRefrigeration cycle equipment.
[Claim 2] The adjustment of the opening degree of the second pressure reducing device at the time of the heating dehumidification measures the discharge temperature of the compressor, compares the set discharge temperature with the measured discharge temperature, and the measured discharge temperature is the above By increasing the opening degree of the second pressure reducing device when the discharge temperature is higher than the set discharge temperature, and decreasing the opening degree of the second pressure reducing device when the measured discharge temperature is smaller than the set discharge temperature. The refrigeration cycle apparatus according to claim 1, which is performed.
[Claim3A refrigeration cycle apparatus according to claim 1, further comprising a third bypass circuit connecting the inlet and the outlet of the first heat exchanger via a third on-off valve.
[Claim4A refrigeration cycle apparatus according to claim 1, further comprising a fourth on-off valve at an inlet of said first heat exchanger.
[Claim5A fifth on-off valve between the refrigerant water heat exchanger outlet and the first pressure reducer;
A first three-way valve between the first heat exchanger outlet and the internal heat exchanger inlet;
A fourth bypass circuit connected between the refrigerant water heat exchanger outlet and the fifth on-off valve inlet as one end and the first three-way valve as the other end;
A second three-way valve between the internal heat exchanger outlet and the second pressure reducer inlet;
A fifth bypass circuit connecting the second three-way valve as one end and the other end between the fifth on-off valve outlet and the first pressure reducer inlet as the other end;
With one end between the first heat exchanger outlet and the first three-way valve and the other end between the second three-way valve and the second pressure reducer via a sixth on-off valve A sixth bypass circuit to connect
The stationary mode in which the refrigerant flowing out from the refrigerant water heat exchanger circulates through the fifth on-off valve, and the start mode in which the fourth bypass circuit and the fifth bypass circuit circulate. The refrigeration cycle apparatus according to claim 1, further comprising: refrigerant circulation mode switching means for switching.
[Claim6] The adjustment of the opening degree of the second pressure reducing device at the time of the heating dehumidification measures the refrigerant temperature Teva of the second heat exchanger, compares the set refrigerant temperature Txeva with the measured refrigerant temperature Teva, and When the measured refrigerant temperature Teva is equal to or higher than the set refrigerant temperature Txeva, the degree of opening of the second pressure reducing device is decreased, and when the measured refrigerant temperature Teva is smaller than the set refrigerant temperature Txeva, the second The refrigeration cycle apparatus according to claim 1, which is performed by increasing the degree of opening of the pressure reducer.
[Claim7] The air conditioning capability according to claim 1, wherein the air conditioning capacity is adjusted by further adjusting the opening degree of the first pressure reducing device at the time of heating and dehumidifying.Refrigeration cycle equipment.
[Claim8] The adjustment of the opening degree of the first pressure reducing device at the time of the heating dehumidification is
The refrigerant temperature Tm of the first heat exchanger is measured, and the set refrigerant temperature Txm and the measured refrigerant temperature Tm are compared, and when the measured refrigerant temperature Tm is the set refrigerant temperature Txm or more, the above The opening degree of the first pressure reducing device is reduced, and the opening degree of the first pressure reducing device is increased when the measured refrigerant temperature Tm is smaller than the set refrigerant temperature Txm,
The refrigerant temperature Teva of the second heat exchanger is measured, and the set refrigerant temperature Txeva and the measured refrigerant temperature Teva are compared, and the measured refrigerant temperature Teva is higher than the set refrigerant temperature Txeva when the measured refrigerant temperature Teva is equal to or higher than the set refrigerant temperature Txeva. 8. The method according to claim 7, wherein the opening degree of the first pressure reducing device is reduced, and the opening degree of the first pressure reducing device is increased when the measured refrigerant temperature Teva is smaller than the set refrigerant temperature Txeva. Refrigeration cycle equipment.
[Claim9Blown-off air temperature detecting means for detecting the temperature of blow-off air blown out through the heater core;
And compressor operating frequency control means for controlling the operating frequency of the compressor.
The compressor operating frequency control means controls the operating frequency of the compressor based on the detected air temperature.1DescribedRefrigeration cycleapparatus.
[Claim10Discharge refrigerant temperature detection means for detecting discharge refrigerant temperature of the compressor
And a bypass circuit that bypasses the second heat exchanger outlet and the inlet of the compressor via an on-off valve.
The opening and closing of the on-off valve is controlled based on the detected temperature of the discharged refrigerant.1DescribedRefrigeration cycleapparatus.
[Claim11Claim used as a vehicle air conditioner1DescribedRefrigeration cycleapparatus.
【０００１】
【発明の属する技術分野】
本発明は、作動媒体として二酸化炭素（以下、ＣＯ2冷媒という）を使用した冷凍サイクル装置に関するものである。
[0001]
Field of the Invention
The present invention, carbon dioxide (hereinafter, CO of 2 refrigerant) as working medium is relates to the refrigeration cycle equipment using.
本発明は、上述した課題に対して、ＣＯ2冷媒を使用した冷凍サイクル装置において、ＣＯ2冷凍システムの特徴を生かし、低圧レシーバを小型化、あるいは用いることなく、信頼性を確保して効率的な運転を可能とする冷凍サイクル装置を提供することを目的とするものである。
Means for Solving the Problems The present invention is an refrigeration cycle apparatus using a CO 2 refrigerant, in which the characteristics of the CO 2 refrigeration system are utilized, and the reliability is ensured without using the low pressure receiver in a compact size or using. it is an object to provide a refrigerating cycle equipment to enable Do operation.
また、本発明は、上述した課題に対して、ＣＯ2冷媒を使用した冷凍サイクル装置において、ＣＯ2冷凍システムの特徴を生かし、高サイド圧力を高くすることなく、中間圧力を調整することにより冷房時と暖房除湿時の最適冷媒量のアンバランスを解消しつつ、信頼性を確保して効率的な運転を可能とする冷凍サイクル装置を提供することを目的とするものである。
The present invention is also directed to a refrigeration cycle apparatus using a CO 2 refrigerant, in which the characteristics of the CO 2 refrigeration system are utilized to adjust the intermediate pressure without raising the high side pressure, in order to solve the problems described above. It is an object of the present invention to provide a refrigeration cycle apparatus which ensures reliability and enables efficient operation while eliminating imbalance of the optimum refrigerant amount at the time of heating and dehumidifying air.
【００２０】
【課題を解決するための手段】
上述した課題を解決するために、第１の本発明は、二酸化炭素を含む冷媒を圧縮する圧縮機と、水サイクルを循環する水と前記冷媒との間で熱交換を行う冷媒水熱交換器と、前記圧縮された冷媒を減圧可能な第１の減圧器と、前記第１の減圧器を経由した冷媒と第１の空気とで熱交換を行う第１の熱交換器と、前記第１の熱交換器で熱交換された冷媒と前記圧縮機に吸引される冷媒とで熱交換を行う内部熱交換器と、前記内部熱交換器で熱交換された冷媒を減圧する第２の減圧器と、前記第２の減圧器で減圧された冷媒と第２の空気とを熱交換する第２の熱交換器と、前記内部熱交換器とを順次接続した冷媒サイクルと、
前記水を加熱する動力機関と、前記冷媒水熱交換器と、前記第２の熱交換器より前記第２の空気の流れの下流側に配置されたヒータコアと、ラジエータとを順次接続した前記水サイクルとを備え、
暖房除湿時には、第２の減圧器の開度を調整することにより、空調能力を調整する冷凍サイクル装置である。
また、第２の本発明は、前記暖房除湿時の第２の減圧器の開度の調整は、前記圧縮機の吐出温度を計測し、設定吐出温度と前記計測された吐出温度を比較して、前記計測された吐出温度が前記設定吐出温度以上の時は前記第２の減圧器の開度を大きくし、前記計測された吐出温度が前記設定吐出温度よりも小さいときは前記第２の減圧器の開度を小さくすることによって行われる第１の本発明の冷凍サイクル装置である。
また、第３の本発明は、前記第１の熱交換器の入口と出口とを第３の開閉弁を介して接続する第３のバイパス回路を備えた第１の本発明の冷凍サイクル装置である。
また、第４の本発明は、前記第１の熱交換器の入口に第４の開閉弁を備えた第１の本発明の冷凍サイクル装置である。
また、第５の本発明は、前記冷媒水熱交換器出口と前記第１の減圧器との間に第５の開閉弁と、
前記第１の熱交換器出口と前記内部熱交換器入口の間に第１の３方弁と、
前記冷媒水熱交換器出口と前記第５の開閉弁入口との間を一端とし、前記第１の３方弁を他端として接続する第４のバイパス回路と、
前記内部熱交換器出口と前記第２の減圧器入口の間に第２の３方弁と、
前記第２の３方弁を一端とし、前記第５の開閉弁出口と前記第１の減圧器入口の間を他端として接続する第５のバイパス回路と、
前記第１の熱交換器出口と前記第１の３方弁との間を一端とし、前記第２の３方弁と第２の減圧器との間を他端として第６の開閉弁を介して接続する第６のバイパス回路と、
前記冷媒水熱交換器から流出した冷媒が、前記第５の開閉弁を介して循環する定常モードと、前記第４のバイパス回路と前記第５のバイパス回路を循環する起動モードとを選択的に切替える冷媒循環モード切替手段とを備えた第１の本発明の冷凍サイクル装置である。
また、第６の本発明は、前記暖房除湿時の第２の減圧器の開度の調整は、前記第２の熱交換器の冷媒温度Ｔｅｖａを計測し、設定冷媒温度Ｔｘｅｖａと前記計測された冷媒温度Ｔｅｖａを比較して、前記計測された冷媒温度Ｔｅｖａが前記設定冷媒温度Ｔｘｅｖａ以上の時は前記第２の減圧器の開度を小さくし、前記計測された冷媒温度Ｔｅｖａが前記設定冷媒温度Ｔｘｅｖａよりも小さいときは前記第２の減圧器の開度を大きくすることによって行われる第１の本発明の冷凍サイクル装置である。
また、第７の本発明は、暖房除湿時には、さらに、第１の減圧器の開度を調整することにより、空調能力を調整する第１の本発明の冷凍サイクル装置である。
また、第８の本発明は、前記暖房除湿時の第１の減圧器の開度の調整は、
前記第１の熱交換器の冷媒温度Ｔｍを計測し、設定冷媒温度Ｔｘｍと前記計測された冷媒温度Ｔｍを比較して、前記計測された冷媒温度Ｔｍが前記設定冷媒温度Ｔｘｍ以上の時は前記第１の減圧器の開度を小さくし、前記計測された冷媒温度Ｔｍが前記設定冷媒温度Ｔｘｍよりも小さいときは前記第１の減圧器の開度を大きくし、
前記第２の熱交換器の冷媒温度Ｔｅｖａを計測し、設定冷媒温度Ｔｘｅｖａと前記計測された冷媒温度Ｔｅｖａを比較して、前記計測された冷媒温度Ｔｅｖａが前記設定冷媒温度Ｔｘｅｖａ以上の時は前記第１の減圧器の開度を小さくし、前記計測された冷媒温度Ｔｅｖａが前記設定冷媒温度Ｔｘｅｖａよりも小さいときは前記第１の減圧器の開度を大きくすることによって行われる第７の本発明の冷凍サイクル装置である。
また、第９の本発明は、前記ヒータコアを介して吹出される吹出し空気温度を検出する吹出し空気温度検出手段と、
前記圧縮機の運転周波数を制御する圧縮機運転周波数制御手段とを備え、
前記圧縮機運転周波数制御手段は、検出された前記空気温度に基づいて前記圧縮機の運転周波数を制御する第１の本発明の冷凍サイクル装置である。
また、第１０の本発明は、前記圧縮機の吐出冷媒温度を検出する吐出冷媒温度検出手段と、
前記第２の熱交換器出口と前記圧縮機の入口を開閉弁を介してバイパスするバイパス回路とを備え、
前記開閉弁は検出された前記吐出冷媒温度に基づいてその開閉が制御される第１の本発明の冷凍サイクル装置である。
また、第１１の本発明は、車両用空調装置として用いられる第１の本発明の冷凍サイクル装置である。
[0020]
[Means for Solving the Problems]
In order to solve the problems described above, according to a first aspect of the present invention, there is provided a compressor for compressing a refrigerant containing carbon dioxide, and a refrigerant water heat exchanger for exchanging heat between water circulating in a water cycle and the refrigerant. When the compressed refrigerant and a first pressure reducer possible vacuum, a first heat exchanger for exchanging heat between the refrigerant and the first air passing through the first pressure reducer, the first An internal heat exchanger performing heat exchange between the refrigerant heat-exchanged by the heat exchanger and the refrigerant drawn into the compressor, and a second decompressor decompressing the refrigerant heat-exchanged by the internal heat exchanger When, a second heat exchanger and a refrigerant is decompressed by the second decompressor and the second air heat exchanger, and a refrigerant cycle sequentially connecting the internal heat exchanger,
The water in which a power engine for heating the water, the refrigerant water heat exchanger, a heater core disposed downstream of the second air flow from the second heat exchanger, and a radiator are sequentially connected Equipped with a cycle,
In the heating and dehumidifying operation, the refrigeration cycle apparatus adjusts the air conditioning capacity by adjusting the opening degree of the second pressure reducer .
In the second aspect of the present invention, the adjustment of the opening degree of the second pressure reducing device at the time of the heating and dehumidifying is performed by measuring the discharge temperature of the compressor and comparing the set discharge temperature with the measured discharge temperature. The opening degree of the second pressure reducing device is increased when the measured discharge temperature is higher than the set discharge temperature, and the second pressure reduction is performed when the measured discharge temperature is smaller than the set discharge temperature. It is a refrigerating cycle device of the 1st this invention performed by making an opening of a vessel small.
A third aspect of the present invention is the refrigeration cycle apparatus according to the first aspect of the present invention, further comprising a third bypass circuit connecting the inlet and the outlet of the first heat exchanger via a third on-off valve. is there.
A fourth aspect of the present invention is the refrigeration cycle apparatus according to the first aspect of the present invention, wherein a fourth on-off valve is provided at the inlet of the first heat exchanger.
Further, according to a fifth aspect of the present invention, there is provided a fifth on-off valve between the refrigerant water heat exchanger outlet and the first pressure reducer;
A first three-way valve between the first heat exchanger outlet and the internal heat exchanger inlet;
A fourth bypass circuit connected between the refrigerant water heat exchanger outlet and the fifth on-off valve inlet as one end and the first three-way valve as the other end;
A second three-way valve between the internal heat exchanger outlet and the second pressure reducer inlet;
A fifth bypass circuit connecting the second three-way valve as one end and the other end between the fifth on-off valve outlet and the first pressure reducer inlet as the other end;
With one end between the first heat exchanger outlet and the first three-way valve and the other end between the second three-way valve and the second pressure reducer via a sixth on-off valve A sixth bypass circuit to connect
The stationary mode in which the refrigerant flowing out from the refrigerant water heat exchanger circulates through the fifth on-off valve, and the start mode in which the fourth bypass circuit and the fifth bypass circuit circulate. 1 is a refrigeration cycle apparatus according to the first aspect of the present invention provided with a refrigerant circulation mode switching unit to be switched.
Further, according to a sixth aspect of the present invention, the adjustment of the opening degree of the second pressure reducing device at the time of the heating dehumidification is performed by measuring the refrigerant temperature Teva of the second heat exchanger and measuring the set refrigerant temperature Txeva. The refrigerant temperature Teva is compared, and when the measured refrigerant temperature Teva is equal to or higher than the set refrigerant temperature Txeva, the degree of opening of the second pressure reducer is decreased, and the measured refrigerant temperature Teva is the set refrigerant temperature. The refrigeration cycle apparatus according to the first aspect of the present invention, which is performed by increasing the opening degree of the second pressure reducer when smaller than Txeva.
The seventh aspect of the present invention is the refrigeration cycle apparatus according to the first aspect of the present invention, wherein the air conditioning capacity is adjusted by further adjusting the opening degree of the first pressure reducer at the time of heating and dehumidifying.
In the eighth aspect of the present invention, the adjustment of the opening degree of the first pressure reducer at the time of the heating dehumidification is
The refrigerant temperature Tm of the first heat exchanger is measured, and the set refrigerant temperature Txm and the measured refrigerant temperature Tm are compared, and when the measured refrigerant temperature Tm is the set refrigerant temperature Txm or more, the above The opening degree of the first pressure reducing device is reduced, and the opening degree of the first pressure reducing device is increased when the measured refrigerant temperature Tm is smaller than the set refrigerant temperature Txm,
The refrigerant temperature Teva of the second heat exchanger is measured, and the set refrigerant temperature Txeva and the measured refrigerant temperature Teva are compared, and the measured refrigerant temperature Teva is higher than the set refrigerant temperature Txeva when the measured refrigerant temperature Teva is equal to or higher than the set refrigerant temperature Txeva. A seventh main operation is performed by decreasing the opening degree of the first decompressor and increasing the opening degree of the first decompressor when the measured refrigerant temperature Teva is smaller than the set refrigerant temperature Txeva. 1 is a refrigeration cycle apparatus of the invention.
A ninth aspect of the present invention is a blowout air temperature detection means for detecting the temperature of blowoff air blown out through the heater core.
And compressor operating frequency control means for controlling the operating frequency of the compressor.
The compressor operating frequency control means is a refrigeration cycle apparatus according to a first aspect of the present invention, which controls the operating frequency of the compressor based on the detected air temperature.
Further, according to a tenth aspect of the present invention, there is provided a discharged refrigerant temperature detecting means for detecting a discharged refrigerant temperature of the compressor.
And a bypass circuit that bypasses the second heat exchanger outlet and the inlet of the compressor via an on-off valve.
The on-off valve is a refrigeration cycle apparatus according to the first aspect of the present invention, the opening and closing of which is controlled based on the detected discharge refrigerant temperature.
An eleventh aspect of the present invention is the refrigeration cycle apparatus according to the first aspect of the present invention used as a vehicle air conditioner.
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【発明の効果】
以上説明したところから明らかなように、本発明は、ＣＯ2冷媒を使用した冷凍サイクル装置において、ＣＯ2冷凍システムの特徴を生かし、低圧レシーバを小型化、あるいは用いることなく、信頼性を確保して効率的な運転を可能とする冷凍サイクル装置を提供することが出来る。
[0144]
【Effect of the invention】
As is apparent from the above description, in the refrigeration cycle apparatus using a CO 2 refrigerant, the present invention secures reliability without making the low pressure receiver smaller or using the characteristics of the CO 2 refrigeration system. it is possible to provide a refrigerating cycle equipment which enables efficient operation Te.
また、本発明は、ＣＯ2冷媒を使用した冷凍サイクル装置において、ＣＯ2冷凍システムの特徴を生かし、高サイド圧力を高くすることなく、中間圧力を調整することにより冷房時と暖房除湿時の最適冷媒量のアンバランスを解消しつつ、信頼性を確保して効率的な運転を可能とする冷凍サイクル装置を提供することが出来る。
Further, the present invention is a refrigeration cycle apparatus using a CO 2 refrigerant, and by making use of the features of the CO 2 refrigeration system and adjusting the intermediate pressure without raising the high side pressure, it is optimal at the time of cooling and heating dehumidification It is possible to provide a refrigeration cycle apparatus that ensures reliability and enables efficient operation while eliminating imbalance in the amount of refrigerant.