Evaporator refrigeration system vehicle equipped with said system and method of evaporating refrigerant

Abstract

An evaporator using a CO 2 refrigeration that prevents a raise in vapor quality of refrigeration in an evaporator passage to obtain heat exchanging efficiency. The evaporator for use in a refrigeration system includes a refrigerant inlet for introducing a refrigerant, a refrigerant outlet for discharging the refrigerant, and an evaporator passage for causing the refrigerant introduced via the refrigerant inlet to evaporate and leading the refrigerant to the refrigerant outlet. An intermediate outlet is provided at an intermediate portion of the evaporator passage. A refrigerant high in vapor quality among the refrigerant passing through the intermediate portion from the refrigerant inlet flows out of the intermediate outlet to prevent a raise in vapor quality of refrigerant.

1 . An evaporator for use in a refrigeration system, said evaporator comprising: 
 a refrigerant inlet for introducing a refrigerant;    a refrigerant outlet for discharging the refrigerant;    an evaporator passage for causing the refrigerant introduced via said refrigerant inlet to evaporate and leading the refrigerant to said refrigerant outlet; and    an intermediate outlet provided at an intermediate portion of said evaporator passage for discharging a refrigerant high in vapor quality among the refrigerant passing through said intermediate portion.    
     
     
         2 . An evaporator for use in a refrigeration system, said evaporator comprising: 
 a pair of header tanks disposed in parallel with each other and provided with a refrigerant inlet and a refrigerant outlet;    a plurality of heat exchanging tubes each having both ends connected to said header tanks in fluid communication and arranged in parallel with each other in a longitudinal direction of said header tank;    a plurality of paths formed by grouping said plurality of heat exchanging tubes;    an evaporator passage for leading the refrigerant introduced via said refrigerant inlet to said refrigerant outlet by passing the refrigerant through said plurality of paths in turn; and    an intermediate outlet provided at an intermediate portion of said evaporator passage for discharging a refrigerant high in vapor quality among the refrigerant passing through said intermediate portion.    
     
     
         3 . An evaporator for use in a refrigeration system, said evaporator comprising: 
 a refrigerant inlet for introducing a refrigerant;    a refrigerant outlet for discharging the refrigerant;    a plurality of evaporation passages for causing the refrigerant to evaporate by passing the refrigerant therein;    an evaporator passage for leading the refrigerant introduced via said refrigerant inlet to said refrigerant outlet by passing the refrigerant through said plurality of evaporation passages in turn; and    an intermediate outlet provided at an intermediate portion of said evaporator passage corresponding to a connecting portion between adjacent evaporation passages for discharging a refrigerant high in vapor quality passing through said intermediate portion.    
     
     
         4 . The evaporator as recited in  claim 1 , wherein it is configured such that the refrigerant whose vapor quality is 0.5 or higher flows out of said intermediate outlet.  
     
     
         5 . The evaporator as recited in  claim 1 , wherein it is configured such that when the refrigerant flowing out of said intermediate outlet of said evaporator passage is defined as a diversion refrigerant and the refrigerant to be led from said intermediate portion of said evaporator passage to said refrigerant outlet is defined as a main refrigerant, the vapor quality of the main refrigerant at said intermediate portion of said evaporator passage is adjusted to 0.3 to 0.7 by the flowing of the diversion refrigerant.  
     
     
         6 . The evaporator as recited in  claim 1 , wherein it is configured such that when the refrigerant flowing out of said intermediate outlet of said evaporator passage is defined as a diversion refrigerant and the refrigerant to be led from said intermediate portion of said evaporator passage to said refrigerant outlet is defined as a main refrigerant, the diversion refrigerant is merged with the main refrigerant at a vicinity of said refrigerant outlet.  
     
     
         7 . The evaporator as recited in  claim 1 , wherein a supercritical refrigerant is used as the refrigerant.  
     
     
         8 . The evaporator as recited in  claim 1 , wherein a carbon dioxide (CO 2 ) refrigerant is used as the refrigerant.  
     
     
         9 . An evaporator for use in a refrigeration system, said evaporator comprising: 
 a refrigerant inlet for introducing a refrigerant;    a refrigerant outlet for discharging the refrigerant;    an evaporator passage for causing the refrigerant introduced via said refrigerant inlet to evaporate and leading the refrigerant to said refrigerant outlet; and    an intermediate outlet provided at an intermediate portion of said evaporator passage for discharging a gaseous refrigerant among the refrigerant passing through said intermediate portion.    
     
     
         10 . An evaporator for use in a refrigeration system, said evaporator comprising: 
 a pair of header tanks disposed in parallel with each other and provided with a refrigerant inlet and a refrigerant outlet;    a plurality of heat exchanging tubes each having both ends connected to said header tanks in fluid communication and arranged in parallel with each other in a longitudinal direction of said header tank;    a plurality of paths formed by grouping said plurality of heat exchanging tubes;    an evaporator passage for leading the refrigerant introduced via said refrigerant inlet to said refrigerant outlet by passing the refrigerant through said plurality of paths in turn; and    an intermediate outlet provided at an intermediate portion of said evaporator passage for discharging a gaseous refrigerant among the refrigerant passing through said intermediate portion.    
     
     
         11 . An evaporator for use in a refrigeration system, said evaporator comprising: 
 a refrigerant inlet for introducing a refrigerant;    a refrigerant outlet for discharging the refrigerant;    a plurality of evaporation passages for causing the refrigerant to evaporate by passing the refrigerant therein;    an evaporator passage for leading the refrigerant introduced via said refrigerant inlet to said refrigerant outlet by passing the refrigerant through said plurality of evaporation passages in turn; and    an intermediate outlet provided at an intermediate portion of said evaporator passage corresponding to a connection portion between adjacent evaporation passages for discharging a gaseous refrigerant among the refrigerant passing through said intermediate portion.    
     
     
         12 . The evaporator as recited in  claim 9 , further comprising a gas-liquid separator provided at said intermediate portion of said evaporator passage, wherein it is configured such that a gas phase refrigerant separated by said gas-liquid separator flows out of said refrigerant outlet and a liquid phase refrigerant is led to said refrigerant outlet via said evaporator passage.  
     
     
         13 . The evaporator as recited in  claim 9 , wherein it is configured such that when the refrigerant flowing out of said intermediate outlet of said evaporator passage is defined as a diversion refrigerant and the refrigerant to be led from said intermediate portion of said evaporator passage to said refrigerant outlet is defined as a main refrigerant, the diversion refrigerant is merged with the main refrigerant at a vicinity of said refrigerant outlet.  
     
     
         14 . The evaporator as recited in  claim 9 , wherein a supercritical refrigerant is used as the refrigerant.  
     
     
         15 . The evaporator as recited in  claim 9 , wherein a carbon dioxide (CO 2 ) refrigerant is used as the refrigerant.  
     
     
         16 . A refrigeration system in which a high-temperature and high-pressure refrigerant compressed by a compressor is cooled by a cooler, a low-temperature and high-pressure refrigerant cooled by said cooler is decompressed by a decompressor, and then the refrigerant decompressed by said decompressor is evaporated by an evaporator and returned to said compressor, 
 wherein said evaporator comprises:    a refrigerant inlet for introducing a refrigerant;    a refrigerant outlet for discharging the refrigerant;    an evaporator passage for causing the refrigerant introduced via said refrigerant inlet to evaporate and leading the refrigerant to said refrigerant outlet; and    an intermediate outlet provided at an intermediate portion of said evaporator passage for discharging a refrigerant high in vapor quality among the refrigerant passing through said intermediate portion.    
     
     
         17 . A refrigeration system in which a high-temperature and high-pressure refrigerant compressed by a compressor is cooled by a cooler, a low-temperature and high-pressure refrigerant cooled by said cooler is decompressed by a decompressor, and then the refrigerant decompressed by said decompressor is evaporated by an evaporator and returned to said compressor, 
 wherein said evaporator comprises:    a pair of header tanks disposed in parallel with each other and provided with a refrigerant inlet and a refrigerant outlet;    a plurality of heat exchanging tubes each having both ends connected to said header tanks in fluid communication and arranged in parallel with each other in a longitudinal direction of said header tank;    a plurality of paths formed by grouping said plurality of heat exchanging tubes;    an evaporation passage for leading the refrigerant introduced via said refrigerant inlet to said refrigerant outlet by passing the refrigerant through said plurality of paths in turn; and    an intermediate outlet provided at an intermediate portion of said evaporator passage for discharging a refrigerant high in vapor quality among the refrigerant passing through said intermediate portion.    
     
     
         18 . A refrigeration system in which a high-temperature and high-pressure refrigerant compressed by a compressor is cooled by a cooler, a low-temperature and high-pressure refrigerant cooled by said cooler is decompressed by a decompressor, and then the refrigerant decompressed by said decompressor is evaporated by an evaporator and returned to said compressor, 
 wherein said evaporator comprises:    a refrigerant inlet for introducing a refrigerant;    a refrigerant outlet for discharging the refrigerant;    a plurality of evaporation passages for causing the refrigerant to evaporate by passing the refrigerant therein;    an evaporator passage for leading the refrigerant introduced via said refrigerant inlet to said refrigerant outlet by passing the refrigerant through said plurality of evaporation passages in turn; and    an intermediate outlet provided at an intermediate portion of said evaporator passage corresponding to a connecting portion between adjacent evaporation passages for discharging a refrigerant high in vapor quality passing through said intermediate portion.    
     
     
         19 . The refrigeration system as recited in  claim 16 , wherein it is configured such that the refrigerant whose vapor quality is 0.5 or higher flows out of said intermediate outlet.  
     
     
         20 . The refrigeration system as recited in  claim 16 , wherein it is configured such that when the refrigerant flowing out of said intermediate outlet of said evaporator passage is defined as a diversion refrigerant and the refrigerant to be led from said intermediate portion of said evaporator passage to said refrigerant outlet is defined as a main refrigerant, the vapor quality of the main refrigerant at said intermediate portion of said evaporator passage is adjusted to 0.3 to 0.7 by the flowing of the diversion refrigerant.  
     
     
         21 . The refrigeration system as recited in  claim 16 , wherein it is configured such that when the refrigerant flowing out of said intermediate outlet of said evaporator passage is defined as a diversion refrigerant and the refrigerant to be led from said intermediate portion of said evaporator passage to said refrigerant outlet is defined as a main refrigerant, the diversion refrigerant is merged with the main refrigerant at a vicinity of said refrigerant outlet.  
     
     
         22 . The refrigeration system as recited in  claim 16 , wherein a supercritical refrigerant is used as the refrigerant.  
     
     
         23 . The refrigeration system as recited in  claim 16 , wherein a carbon dioxide (CO 2 ) refrigerant is used as the refrigerant.  
     
     
         24 . A refrigeration system in which a high-temperature and high-pressure refrigerant compressed by a compressor is cooled by a cooler, a low-temperature and high-pressure refrigerant cooled by said cooler is decompressed by a decompressor, and then the refrigerant decompressed by said decompressor is evaporated by an evaporator and returned to said compressor, 
 wherein said evaporator comprises:    a refrigerant inlet for introducing a refrigerant;    a refrigerant outlet for discharging the refrigerant;    an evaporator passage for causing the refrigerant introduced via said refrigerant inlet to evaporate and leading the refrigerant to said refrigerant outlet; and    an intermediate outlet provided at an intermediate portion of said evaporator passage for discharging a gas phase refrigerant among the refrigerant passing through said intermediate portion.    
     
     
         25 . A refrigeration system in which a high-temperature and high-pressure refrigerant compressed by a compressor is cooled by a cooler, a low-temperature and high-pressure refrigerant cooled by said cooler is decompressed by a decompressor, and then the refrigerant decompressed by said decompressor is evaporated by an evaporator and returned to said compressor, 
 wherein said evaporator comprises:    a pair of header tanks disposed in parallel with each other and provided with a refrigerant inlet and a refrigerant outlet;    a plurality of heat exchanging tubes each having both ends connected to said header tanks in fluid communication and arranged in parallel with each other in a longitudinal direction of said header tank;    a plurality of paths formed by grouping said plurality of heat exchanging tubes;    an evaporator passage for leading the refrigerant introduced via said refrigerant inlet to said refrigerant outlet by passing the refrigerant through said plurality of paths in turn; and    an intermediate outlet provided at an intermediate portion of said evaporator passage for discharging a gas phase refrigerant among the refrigerant passing through said intermediate portion.    
     
     
         26 . A refrigeration system in which a high-temperature and high-pressure refrigerant compressed by a compressor is cooled by a cooler, a low-temperature and high-pressure refrigerant cooled by said cooler is decompressed by a decompressor, and then the refrigerant decompressed by said decompressor is evaporated by an evaporator and returned to said compressor, 
 wherein said evaporator comprises:    a refrigerant inlet for introducing a refrigerant;    a refrigerant outlet for discharging the refrigerant;    a plurality of evaporation passages for causing the refrigerant to evaporate by passing the refrigerant therein;    an evaporator passage for leading the refrigerant introduced via said refrigerant inlet to said refrigerant outlet by passing the refrigerant through said plurality of evaporation passages in turn; and    an intermediate outlet provided at an intermediate portion of said evaporator passage corresponding to a connection portion between adjacent evaporation passages for discharging a gas phase refrigerant among the refrigerant passing through said intermediate portion.    
     
     
         27 . The refrigeration system as recited in  claim 24 , further comprising a gas-liquid separator provided at said intermediate portion of said evaporator passage, wherein it is configured such that a liquid phase refrigerant separated by said gas-liquid separator flows out of said refrigerant outlet and a liquid refrigerant is led to said refrigerant outlet via said evaporator passage.  
     
     
         28 . The refrigeration system as recited in  claim 24 , wherein it is configured such that when the refrigerant flowing out of said intermediate outlet of said evaporator passage is defined as a diversion refrigerant and the refrigerant to be led from said intermediate portion of said evaporator passage to said refrigerant outlet is defined as a main refrigerant, the diversion refrigerant is merged with the main refrigerant at a vicinity of said refrigerant outlet.  
     
     
         29 . The refrigeration system as recited in  claim 24 , wherein a supercritical refrigerant is used as the refrigerant.  
     
     
         30 . The refrigeration system as recited in  claim 24 , wherein a carbon dioxide (CO 2 ) refrigerant is used as the refrigerant.  
     
     
         31 . A method for evaporating a refrigerant using an evaporator, wherein said evaporator comprises: 
 a refrigerant inlet for introducing a refrigerant;    a refrigerant outlet for discharging the refrigerant;    an evaporator passage for causing the refrigerant introduced via said refrigerant inlet to evaporate and leading the refrigerant to said refrigerant outlet; and    an intermediate outlet provided at an intermediate portion of said evaporator passage for discharging a refrigerant high in vapor quality among the refrigerant passing through said intermediate portion.    
     
     
         32 . A method for evaporating a refrigerant using an evaporator, wherein said evaporator comprises: 
 a pair of header tanks disposed in parallel with each other and provided with a refrigerant inlet and a refrigerant outlet;    a plurality of heat exchanging tubes each having both ends connected to said header tanks in fluid communication and arranged in parallel with each other in a longitudinal direction of said header tank;    a plurality of paths formed by grouping said plurality of heat exchanging tubes;    an evaporator passage for leading the refrigerant introduced via said refrigerant inlet to said refrigerant outlet by passing the refrigerant through said plurality of paths in turn; and    an intermediate outlet provided at an intermediate portion of said evaporator passage for discharging a refrigerant high in vapor quality among the refrigerant passing through said intermediate portion.    
     
     
         33 . A method for evaporating a refrigerant using an evaporator, wherein said evaporator comprises: 
 a refrigerant inlet for introducing a refrigerant;    a refrigerant outlet for discharging the refrigerant;    a plurality of evaporation passages for causing the refrigerant to evaporate by passing the refrigerant therein; and    an evaporator passage for leading the refrigerant introduced via said refrigerant inlet to said refrigerant outlet by passing the refrigerant through said plurality of evaporation passages in turn,    wherein at an intermediate portion of said evaporator passage corresponding to a connecting portion between adjacent evaporation passages, a refrigerant high in vapor quality among the refrigerant passing through said intermediate portion flows out.    
     
     
         34 . The method for evaporating a refrigerant as recited in  claim 31 , wherein the refrigerant whose vapor quality is 0.5 or higher flows out of said intermediate outlet of said evaporator passage.  
     
     
         35 . The method for evaporating a refrigerant as recited in  claim 31 , wherein when the refrigerant flowing out of said intermediate outlet of said evaporator passage is defined as a diversion refrigerant and the refrigerant to be led from said intermediate portion of said evaporator passage to said refrigerant outlet is defined as a main refrigerant, the vapor quality of the main refrigerant at said intermediate portion of said evaporator passage is adjusted to 0.3 to 0.7 by the flowing of the diversion refrigerant.  
     
     
         36 . The method for evaporating a refrigerant evaporator as recited in  claim 31 , wherein when the refrigerant flowing out of said intermediate outlet of said evaporator passage is defined as a diversion refrigerant and the refrigerant to be led from said intermediate portion of said evaporator passage to said refrigerant outlet is defined as a main refrigerant, the diversion refrigerant is merged with the main refrigerant at a vicinity of said refrigerant outlet.  
     
     
         37 . The method for evaporating a refrigerant as recited in  claim 31 , wherein a supercritical refrigerant is used as the refrigerant.  
     
     
         38 . The method for evaporating a refrigerant as recited in  claim 31 , wherein a carbon dioxide (CO 2 ) refrigerant is used as the refrigerant.  
     
     
         39 . A method for evaporating a refrigerant using an evaporator, wherein said evaporator comprises: 
 a refrigerant inlet for introducing a refrigerant;    a refrigerant outlet for discharging the refrigerant; and    an evaporator passage for causing the refrigerant introduced via said refrigerant inlet to evaporate and leading the refrigerant to said refrigerant outlet, wherein at an intermediate outlet provided at an intermediate portion of said evaporator passage, a gas phase refrigerant among the refrigerant passing through said intermediate portion flows out.    
     
     
         40 . A method for evaporating a refrigerant using an evaporator, wherein said evaporator comprises: 
 a pair of header tanks disposed in parallel with each other and provided with a refrigerant inlet and a refrigerant outlet;    a plurality of heat exchanging tubes each having both ends connected to said header tanks in fluid communication and arranged in parallel with each other in a longitudinal direction of said header tank;    a plurality of paths formed by grouping said plurality of heat exchanging tubes;    an evaporator passage for leading the refrigerant introduced via said refrigerant inlet to said refrigerant outlet by passing the refrigerant through said plurality of paths in turn, and    wherein at an intermediate outlet provided at an intermediate portion of said evaporator passage, a gas phase refrigerant among the refrigerant passing through said intermediate portion flows out.    
     
     
         41 . A method for evaporating a refrigerant using an evaporator, wherein said evaporator comprises: 
 a refrigerant inlet for introducing a refrigerant;    a refrigerant outlet for discharging the refrigerant;    a plurality of evaporation passages for causing the refrigerant to evaporate by passing the refrigerant therein; and    an evaporator passage for leading the refrigerant introduced via said refrigerant inlet to said refrigerant outlet via by passing the refrigerant through said plurality of evaporation passages in turn, and    wherein at an intermediate outlet provided at an intermediate portion of said evaporator passages corresponding to a connection portion between adjacent evaporation passages, a gas phase refrigerant among the refrigerant passing through said intermediate portion flows out.    
     
     
         42 . The method for evaporating a refrigerant as recited in  claim 39 , wherein said evaporator further comprises a gas-liquid separator provided at said intermediate portion of said evaporator passage, wherein a gas phase refrigerant separated by said gas-liquid separator flows out of said refrigerant outlet and a liquid refrigerant is led to said refrigerant outlet via said evaporator passage.  
     
     
         43 . The method for evaporating a refrigerant as recited in  claim 39 , wherein when the refrigerant flowing out of said intermediate outlet of said evaporator passage is defined as a diversion refrigerant and the refrigerant to be led from said intermediate portion of said evaporator passage to said refrigerant outlet is defined as a main refrigerant, the diversion refrigerant is merged with the main refrigerant at a vicinity of said refrigerant outlet.  
     
     
         44 . The method for evaporating a refrigerant as recited in  claim 39 , wherein a supercritical refrigerant is used as the refrigerant.  
     
     
         45 . The method for evaporating a refrigerant as recited in  claim 39 , wherein a carbon dioxide (CO 2 ) refrigerant is used as the refrigerant.  
     
     
         46 . An evaporator for use in a vehicle refrigeration, said evaporator comprising: 
 a refrigerant inlet for introducing a refrigerant;    a refrigerant outlet for discharging the refrigerant;    an evaporator passage for causing the refrigerant introduced via said refrigerant inlet to evaporate and leading the refrigerant to said refrigerant outlet; and    an intermediate outlet provided at an intermediate portion of said evaporator passage for discharging a refrigerant high in vapor quality among the refrigerant passing through said intermediate portion.    
     
     
         47 . An evaporator for use in a vehicle refrigeration system, said evaporator comprising: 
 a refrigerant inlet for introducing a refrigerant;    a refrigerant outlet for discharging the refrigerant;    an evaporator passage for causing the refrigerant introduced via said refrigerant inlet to evaporate and leading the refrigerant to said refrigerant outlet; and    an intermediate outlet provided at an intermediate portion of said evaporator passage for discharging a gas phase refrigerant among the refrigerant passing through said intermediate portion.    
     
     
         48 . The evaporator for use in a vehicle refrigeration system as recited in  claim 46 , wherein a supercritical refrigerant is used as the refrigerant.  
     
     
         49 . The evaporator for use in a vehicle refrigeration system as recited in  claim 46 , wherein a carbon dioxide (CO 2 ) refrigerant is used as the refrigerant.  
     
     
         50 . A refrigeration system for use in vehicles in which a high-temperature and high-pressure refrigerant compressed by a compressor is cooled by a cooler, a low-temperature and high-pressure refrigerant cooled by said cooler is decompressed by a decompressor, and then the refrigerant decompressed by said decompressor is evaporated by an evaporator and returned to said compressor, 
 wherein said evaporator comprises:    a refrigerant inlet for introducing a refrigerant;    a refrigerant outlet for discharging the refrigerant;    an evaporator passage for causing the refrigerant introduced via said refrigerant inlet to evaporate and leading the refrigerant to said refrigerant outlet; and    an intermediate outlet provided at an intermediate portion of said evaporator passage for discharging a refrigerant high in vapor quality among the refrigerant passing through said intermediate portion.    
     
     
         51 . A refrigeration system for use in vehicles in which a high-temperature and high-pressure refrigerant compressed by a compressor is cooled by a cooler, a low-temperature and high-pressure refrigerant cooled by said cooler is decompressed by a decompressor, and then the refrigerant decompressed by said decompressor is evaporated by an evaporator and returned to said compressor, 
 wherein said evaporator comprises:    a refrigerant inlet for introducing a refrigerant;    a refrigerant outlet for discharging the refrigerant;    an evaporator passage for causing the refrigerant introduced via said refrigerant inlet to evaporate and leading the refrigerant to said refrigerant outlet; and    an intermediate outlet provided at an intermediate portion of said evaporator passage for discharging a gas phase refrigerant among the refrigerant passing through said intermediate portion.    
     
     
         52 . The refrigeration system for use in vehicles as recited in  claim 50 , wherein a supercritical refrigerant is used as the refrigerant.  
     
     
         53 . The refrigeration system for use in vehicles as recited in  claim 50 , wherein a carbon dioxide (CO 2 ) refrigerant is used as the refrigerant.  
     
     
         54 . A vehicle equipped with a refrigeration system, 
 wherein in said refrigeration system, a high-temperature and high-pressure refrigerant compressed by a compressor is cooled by a cooler, a low-temperature and high-pressure refrigerant cooled by said cooler is decompressed by a decompressor, and then the refrigerant decompressed by said decompressor is evaporated by an evaporator and returned to said compressor, and    wherein said evaporator comprises:    a refrigerant inlet for introducing a refrigerant;    a refrigerant outlet for discharging the refrigerant;    an evaporator passage for causing the refrigerant introduced via said refrigerant inlet to evaporate and leading the refrigerant to said refrigerant outlet; and    an intermediate outlet provided at an intermediate portion of said evaporator passage for discharging a refrigerant high in vapor quality among the refrigerant passing through said intermediate portion.    
     
     
         55 . A vehicle equipped with a refrigeration system, 
 wherein in said refrigeration system, a high-temperature and high-pressure refrigerant compressed by a compressor is cooled by a cooler, a low-temperature and high-pressure refrigerant cooled by said cooler is decompressed by a decompressor, and then the refrigerant decompressed by said decompressor is evaporated by an evaporator and returned to said compressor, and    wherein said evaporator comprises:    a refrigerant inlet for introducing a refrigerant;    a refrigerant outlet for discharging the refrigerant;    an evaporator passage for causing the refrigerant introduced via said refrigerant inlet to evaporate and leading the refrigerant to said refrigerant outlet; and    an intermediate outlet provided at an intermediate portion of said evaporator passage for discharging a gas phase refrigerant among the refrigerant passing through said intermediate portion.    
     
     
         56 . The vehicle equipped with a refrigeration system as recited in  claim 54 , wherein a supercritical refrigerant is used as the refrigerant.  
     
     
         57 . The vehicle equipped with a refrigeration system as recited in  claim 54 , wherein a carbon dioxide (CO 2 ) refrigerant is used as the refrigerant.