Refrigeration apparatus and temperature regulation system

Abstract

A refrigeration apparatus comprises a high-temperature-side refrigeration circuit and a low-temperature-side refrigeration circuit. A water cooler is between a compressor and a condenser of the low-temperature-side refrigeration circuit. The refrigeration apparatus performs an operation in such a manner that the following relationships are satisfied, “0.25×(CL+PA)≤CW≤0.4×(CL+PA), and 0.6×(CL+PA)≤CH≤0.75×(CL+PA), and 0.5×PA≤CW, and F1≤F2”, wherein CL (Kw) represents a refrigeration capacity of an evaporator of the low-temperature-side refrigeration circuit, PA (Kw) represents compression power of a compressor of the low-temperature-side refrigeration circuit, CW (Kw) represents a cooling capacity of the water cooler, CH (Kw) represents a refrigeration capacity of an evaporator of the high-temperature-side refrigeration circuit, F1 (Kg/hour) represents a refrigerant circulation rate of the high-temperature-side refrigeration circuit, and F2 (Kg/hour) represents a refrigerant circulation rate of the low-temperature-side refrigeration circuit.

1 . A refrigeration apparatus comprising a high-temperature-side refrigeration circuit and a low-temperature-side refrigeration circuit, an evaporator of the high-temperature-side refrigeration circuit and a condenser of the low-temperature-side refrigeration circuit constituting a cascade condenser,
 wherein the refrigeration apparatus comprises a water cooler that cools a low-temperature-side refrigerant circulated by the low-temperature-side refrigeration circuit, between a compressor and a condenser in the low-temperature-side refrigeration circuit, and   wherein the refrigeration apparatus performs an operation in such a manner that the following relationships are satisfied, 0.25×(CL+PA)≤CW≤0.4×(CL+PA), and 0.6×(CL+PA)≤CH≤0.75×(CL+PA), and 0.5×PA≤CW, and F1≤F2, wherein CL (Kw) represents a refrigeration capacity of an evaporator of the low-temperature-side refrigeration circuit, PA (Kw) represents compression power of a compressor of the low-temperature-side refrigeration circuit, CW (Kw) represents a cooling capacity of the water cooler, CH (Kw) represents a refrigeration capacity of an evaporator of the high-temperature-side refrigeration circuit, F1 (Kg/hour) represents a refrigerant circulation rate of the high-temperature-side refrigeration circuit, and F2 (Kg/hour) represents a refrigerant circulation rate of the low-temperature-side refrigeration circuit.   
     
     
         2 . The refrigeration apparatus according to  claim 1 , wherein
 the refrigeration apparatus performs an operation in such a manner that a relationship of 0.5×F2<F1≤0.7×F2 is satisfied.   
     
     
         3 . The refrigeration apparatus according to  claim 2 , wherein
 the refrigeration apparatus performs an operation in such a manner that the refrigerant circulation rate F1 of the high-temperature-side refrigeration circuit is between 470 Kg/hour or more and 600 Kg/hour or less, and that the refrigerant circulation rate F2 of the low-temperature-side refrigeration circuit is between 880 Kg/hour or more and 920 Kg/hour or less.   
     
     
         4 . The refrigeration apparatus according to any of  claims 1 to 3 , wherein
 the water cooler cools the low-temperature-side refrigerant by means of water in a range between 5° C. or more and 28° C. or less.   
     
     
         5 . The refrigeration apparatus according to  claim 1 , wherein
 the water cooler flows water from a water source, without regulating a temperature of the water, to cool the low-temperature-side refrigerant.   
     
     
         6 . The refrigeration apparatus according to  claim 1 , wherein
 the refrigeration capacity CL of an evaporator of the low-temperature-side refrigeration circuit is 30 Kw or less.   
     
     
         7 . The refrigeration apparatus according to  claim 6 , wherein
 the refrigeration capacity CL of an evaporator of the low-temperature-side refrigeration circuit is between 20 Kw or more and 30 Kw or less.   
     
     
         8 . The refrigeration apparatus according to  claim 1 , wherein
 the refrigeration capacity CL of an evaporator of the low-temperature-side refrigeration circuit is between twice or more and three times or less a lower limit value of the cooling capacity CW of the water cooler.   
     
     
         9 . The refrigeration apparatus according to  claim 1 , wherein
 the refrigeration apparatus is further provided with a low-temperature-side hot gas circuit, which delivers a low-temperature-side refrigerant, which has flown out from a compressor of the low-temperature-side refrigeration circuit and has not yet passed through the water cooler and a condenser of the low-temperature-side refrigeration circuit, to a part of the low-temperature-side refrigeration circuit, which is downstream of an expansion valve and upstream of an evaporator.   
     
     
         10 . A temperature regulation system comprising:
 a refrigeration apparatus according to  claim 1 , and   a fluid flow apparatus that flows a fluid to be cooled by an evaporator of the low-temperature-side refrigeration circuit.