Refrigeration cycle apparatus

Abstract

A refrigerant cycle apparatus comprising: a compressor 1 , a radiator 2 , decompression means 3 , a heat absorber 4 , an internal heat exchanger 5 that performs heat exchange between a refrigerant at an outlet of said radiator and the refrigerant at an outlet of said heat absorber, wherein first temperature detection means 30 for detecting a refrigerant temperature between an outlet of the compressor 1 and an inlet of the radiator 2 and second temperature detection means 31 for detecting the refrigerant temperature between the outlet of the radiator 2 and a high-pressure side inlet of the internal heat exchanger 5 are provided, and an opening degree of decompression means 3 is controlled so that a temperature difference (ΔT) between a detection temperature by the first temperature detection means 30 and the detection temperature by the second temperature detection means 31 becomes a target value.

1 . A refrigerant cycle apparatus comprising:
 at least a compressor, a radiator, decompression means capable of changing an open degree, a heat absorber, an internal heat exchanger that performs heat exchange between a refrigerant at an outlet of said radiator and the refrigerant at an outlet of said heat absorber, wherein   first refrigerant conditions detection means for detecting standard conditions of at least said radiator and second refrigerant conditions detection means for detecting refrigerant conditions between an outlet of said radiator and a high-pressure side inlet of said internal heat exchanger are provided, and   an opening of said decompression means is controlled so that a calculation value calculated based on at least an output of said first refrigerant conditions detection means and the output of said second refrigerant conditions detection means becomes a target value.   
   
   
       2 . The refrigerant cycle apparatus of  claim 1  comprising:
 third temperature detection means for detecting an inlet temperature of a medium to be heated and fourth temperature detection means for detecting an outlet temperature of the medium to be heated, wherein   the opening degree of said decompression means is controlled such that a calculation value calculated based on outputs of said first refrigerant condition detection means, said second refrigerant condition detection means, said third temperature detection means, and said fourth temperature detection means become a target value.   
   
   
       3 . A refrigerant cycle apparatus comprising:
 at least a compressor, a radiator, decompression means capable of changing an open degree, a heat absorber, an internal heat exchanger that performs heat exchange between a refrigerant at an outlet of said radiator and the refrigerant at an outlet of said heat absorber, wherein   first temperature detection means for detecting a refrigerant temperature between an outlet of said compressor and an inlet of said radiator and second temperature detection means for detecting the refrigerant temperature between an outlet of said radiator and a high-pressure side inlet of said internal heat exchanger are provided, and   an opening degree of said decompression means is controlled such that a temperature difference (ΔT) between a detection temperature by said first temperature detection means and the detection temperature by said second temperature detection means becomes a target value.   
   
   
       4 . The refrigerant cycle apparatus of  claim 3  further comprising:
 third temperature detection means for detecting an inlet temperature of a medium to be heated and fourth temperature detection means for detecting an outlet temperature of the medium to be heated, wherein   the opening degree of said decompression means is controlled such that a calculation value calculated based on outputs of said first temperature detection means, said second temperature detection means, said third temperature detection means, and said fourth temperature detection means, instead of said temperature difference (ΔT), become a target value.   
   
   
       5 . A refrigerant cycle apparatus comprising:
 at least a compressor, a radiator, decompression means capable of changing an open degree, a heat absorber, an internal heat exchanger that performs heat exchange between a refrigerant at an outlet of said radiator and the refrigerant at an outlet of said heat absorber, wherein   first temperature detection means for detecting a refrigerant temperature between an outlet of said compressor and an inlet of said radiator and second temperature detection means for detecting the refrigerant temperature between the outlet of said radiator and a high-pressure side inlet of said internal heat exchanger, third temperature detection means for detecting an inlet temperature of a medium to be heated and fourth temperature detection means for detecting the outlet temperature of the medium to be heated are provided, and   an opening degree of said decompression means is controlled such that a sum (ΣΔT) of a temperature difference (ΔT 1 ) between a detection temperature by said first temperature detection means and the detection temperature by said fourth temperature detection means and the temperature difference (ΔT 2 ) between the detection temperature by said second temperature detection means and the detection temperature by said third temperature detection means becomes a target value.   
   
   
       6 . A refrigerant cycle apparatus comprising:
 at least a compressor, a radiator, decompression means capable of changing an open degree, a heat absorber, an internal heat exchanger that performs heat exchange between a refrigerant at an outlet of said radiator and the refrigerant at an outlet of said heat absorber, wherein   first temperature detection means for detecting a refrigerant temperature between an outlet of said compressor and an inlet of said radiator and second temperature detection means for detecting the refrigerant temperature between the outlet of said radiator and a high-pressure side inlet of said internal heat exchanger, third temperature detection means for detecting an inlet temperature of a medium to be heated and fourth temperature detection means for detecting an outlet temperature of the medium to be heated are provided, and   an opening degree of said decompression means is controlled such that a difference (ΔT 1 −ΔT 2 ) between a second temperature difference (ΔT 1 ) between a detection temperature by said first temperature detection means and the detection temperature by said fourth temperature detection means and a third temperature difference (ΔT 2 ) between the detection temperature by said second temperature detection means and the detection temperature by said third temperature detection means becomes a target value.   
   
   
       7 . A refrigerant cycle apparatus comprising:
 at least a compressor, a radiator, decompression means capable of changing an open degree, a heat absorber, an internal heat exchanger that performs heat exchange between a refrigerant at an outlet of said radiator and the refrigerant at an outlet of said heat absorber, wherein   first pressure detection means for detecting a refrigeration pressure between at least an outlet of said compressor and an inlet of said decompression means and second temperature detection means for detecting a refrigeration temperature between the outlet of said radiator and a high-pressure side inlet of said internal heat exchanger are provided, and   an opening degree of said decompression means is controlled such that a calculation value calculated based on a detection pressure by said first pressure detection means and a detection temperature by said second temperature detection means becomes a target value.   
   
   
       8 . A refrigerant cycle apparatus comprising:
 at least a compressor, a radiator, decompression means capable of changing an open degree, a heat absorber, an internal heat exchanger that performs heat exchange between a refrigerant at an outlet of said radiator and the refrigerant at an outlet of said heat absorber, wherein   second temperature detection means for detecting a refrigerant temperature between an outlet of said radiator and a high-pressure side inlet of said internal heat exchanger and internal heat exchanger outlet temperature detection means for detecting the refrigerant temperature between a high-pressure side outlet of said internal heat exchanger and an inlet of said compression means are provided, and   an opening degree of said decompression means is controlled such that a temperature difference (ΔThx) between a detection temperature by said second temperature detection means and the detection temperature by said internal heat exchanger outlet temperature detection means becomes a target value.   
   
   
       9 . The refrigerant cycle apparatus of  claim 1 , wherein
 sixth temperature detection means for detecting the refrigerant temperature between a low-pressure side outlet of said internal heat exchanger and an inlet of said compressor is provided,   superheat degree of a compressor suction part is calculated from a refrigerant saturation temperature at a detection point of said sixth temperature detection means and a detection temperature by said sixth temperature detection means, and   the opening degree of said decompression means is controlled such that said superheat degree becomes the target value.   
   
   
       10 . The refrigerant cycle apparatus of  claim 9 , wherein
 second pressure detection means is provided between the low-pressure side outlet of said internal heat exchanger and the inlet of said compressor and   said refrigerant saturation temperature is calculated based on a detection value of said second pressure detection means.   
   
   
       11 . The refrigerant cycle apparatus of  claim 9 , wherein
 fifth temperature detection means is provided between the inlet of said heat absorber and the low-pressure side inlet of said internal heat exchanger and   said refrigerant saturation temperature is calculated based on the detection temperature of said fifth temperature detection means.   
   
   
       12 . The refrigerant cycle apparatus of  claim 9 , wherein
 a priority is given to control said superheat degree over said temperature difference.   
   
   
       13 . The refrigerant cycle apparatus of  claim 1 , wherein
 said radiator is a heat exchanger that exchanges heat with water.   
   
   
       14 . The refrigerant cycle apparatus of  claim 1 , wherein
 carbon dioxide is used as a refrigerant.   
   
   
       15 . The refrigerant cycle apparatus of  claim 5 , wherein
 sixth temperature detection means for detecting the refrigerant temperature between a low-pressure side outlet of said internal heat exchanger and an inlet of said compressor is provided,   superheat degree of a compressor suction part is calculated from a refrigerant saturation temperature at a detection point of said sixth temperature detection means and a detection temperature by said sixth temperature detection means, and   the opening degree of said decompression means is controlled such that said superheat degree becomes the target value.   
   
   
       16 . The refrigerant cycle apparatus of  claim 6 , wherein
 sixth temperature detection means for detecting the refrigerant temperature between a low-pressure side outlet of said internal heat exchanger and an inlet of said compressor is provided,   superheat degree of a compressor suction part is calculated from a refrigerant saturation temperature at a detection point of said sixth temperature detection means and a detection temperature by said sixth temperature detection means, and   the opening degree of said decompression means is controlled such that said superheat degree becomes the target value.   
   
   
       17 . The refrigerant cycle apparatus of  claim 15 , wherein
 second pressure detection means is provided between the low-pressure side outlet of said internal heat exchanger and the inlet of said compressor and   said refrigerant saturation temperature is calculated based on a detection value of said second pressure detection means.   
   
   
       18 . The refrigerant cycle apparatus of  claim 16 , wherein
 second pressure detection means is provided between the low-pressure side outlet of said internal heat exchanger and the inlet of said compressor and   said refrigerant saturation temperature is calculated based on a detection value of said second pressure detection means.   
   
   
       19 . The refrigerant cycle apparatus of  claim 15 , wherein
 fifth temperature detection means is provided between the inlet of said heat absorber and the low-pressure side inlet of said internal heat exchanger and   said refrigerant saturation temperature is calculated based on the detection temperature of said fifth temperature detection means.   
   
   
       20 . The refrigerant cycle apparatus of  claim 16 , wherein
 fifth temperature detection means is provided between the inlet of said heat absorber and the low-pressure side inlet of said internal heat exchanger and   said refrigerant saturation temperature is calculated based on the detection temperature of said fifth temperature detection means.