Refrigerating Apparatus

Abstract

The loss of refrigerant pressure which is caused in a return-side interconnecting piping line ( 19 ) comprising return-side interconnecting piping lines respectively extending from outlet ports ( 24, 34, 44 ) of single-stage side utilization units ( 12, 13, 14 ) to an inlet port ( 61 ) of a heat source unit ( 11 ) is set such that the lowest valued refrigerant pressure loss is caused by a said return-side interconnecting piping line of the return-side interconnecting piping line ( 19 ) that is connected to the lowest of the single-stage side utilization units ( 12, 13, 14 ) in compartment preset temperature.

1 . A refrigerating apparatus comprising: (a) a plurality of single-stage side utilization units ( 12 ,  13 ,  14 ) having cooling heat exchangers ( 21 ,  31 ,  41 ) respectively, each of the cooling heat exchangers ( 21 ,  31 ,  41 ) being configured to provide cooling of its associated compartment so that the associated compartment is kept at a predetermined preset temperature, and (b) a single heat source unit ( 11 ) having a compressor ( 29 ), wherein in a refrigerant circuit ( 20 ) in which the single-stage side utilization units ( 12 ,  13 ,  14 ) are connected in parallel with the heat source unit ( 11 ) by interconnecting piping lines ( 18 ,  19 ) refrigerant is circulated between each of the single-stage side utilization units ( 12 ,  13 ,  14 ) and the heat source unit ( 11 ) whereby single-stage compression refrigeration cycles are performed,
 wherein the loss of pressure of the refrigerant which is caused in the return-side interconnecting piping line ( 19 ) comprising return-side interconnecting piping lines respectively extending from outlet ports ( 24 ,  34 ,  44 ) of the single-stage side utilization units ( 12 ,  13 ,  14 ) to an inlet port ( 61 ) of the heat source unit ( 11 ) is set such that the lowest valued refrigerant pressure loss is caused by a said return-side interconnecting piping line that is connected to the lowest of the single-stage side utilization units ( 12 ,  13 ,  14 ) in compartment preset temperature.   
   
   
       2 . A refrigerating apparatus comprising: (a) a plurality of single-stage side utilization units ( 12 ,  13 ,  14 ) having cooling heat exchangers ( 21 ,  31 ,  41 ) respectively, each of the cooling heat exchangers ( 21 ,  31 ,  41 ) being configured to provide cooling of its associated compartment so that the associated compartment is kept at a predetermined preset temperature, and (b) a single heat source unit ( 11 ) having a compressor ( 29 ), wherein in a refrigerant circuit ( 20 ) in which the single-stage side utilization units ( 12 ,  13 ,  14 ) are connected in parallel with the heat source unit ( 11 ) by interconnecting piping lines ( 18 ,  19 ) refrigerant is circulated between each of the single-stage side utilization units ( 12 ,  13 ,  14 ) and the heat source unit ( 11 ) whereby single-stage compression refrigeration cycles are performed,
 wherein the loss of pressure of the refrigerant which is caused in the return-side interconnecting piping line ( 19 ) comprising return-side interconnecting piping lines respectively extending from outlet ports ( 24 ,  34 ,  44 ) of the single-stage side utilization units ( 12 ,  13 ,  14 ) to an inlet port ( 61 ) of the heat source unit ( 11 ) is set such that the aforesaid refrigerant pressure loss becomes smaller as the compartment preset temperature in the single-stage side utilization units ( 12 ,  13 ,  14 ) connected respectively by the aforesaid return-side interconnecting piping lines to the inlet port ( 61 ) of the heat source unit ( 11 ) becomes lower.   
   
   
       3 . A refrigerating apparatus comprising: (a) a plurality of single-stage side utilization units ( 12 ,  13 ,  14 ) having cooling heat exchangers ( 21 ,  31 ,  41 ) respectively, each of the cooling heat exchangers ( 21 ,  31 ,  41 ) being configured to provide cooling of its associated compartment so that the associated compartment is kept at a predetermined preset temperature, and (b) a single heat source unit ( 11 ) having a compressor ( 29 ), wherein in a refrigerant circuit ( 20 ) in which the single-stage side utilization units ( 12 ,  13 ,  14 ) are connected in parallel with the heat source unit ( 11 ) by interconnecting piping lines ( 18 ,  19 ) refrigerant is circulated between each of the single-stage side utilization units ( 12 ,  13 ,  14 ) and the heat source unit ( 11 ) whereby single-stage compression refrigeration cycles are performed,
 wherein the length of return-side interconnecting piping lines respectively extending from outlet ports ( 24 ,  34 ,  44 ) of the single-stage side utilization units ( 12 ,  13 ,  14 ) to an inlet port ( 61 ) of the heat source unit ( 11 ) is set such that a said return-side interconnecting piping line that is connected to the lowest of the single-stage side utilization units ( 12 ,  13 ,  14 ) in compartment preset temperature is the shortest return-side interconnecting piping line.   
   
   
       4 . A refrigerating apparatus comprising: (a) a plurality of single-stage side utilization units ( 12 ,  13 ,  14 ) having cooling heat exchangers ( 21 ,  31 ,  41 ) respectively, each of the cooling heat exchangers ( 21 ,  31 ,  41 ) being configured to provide cooling of its associated compartment so that the associated compartment is kept at a predetermined preset temperature, and (b) a single heat source unit ( 11 ) having a compressor ( 29 ), wherein in a refrigerant circuit ( 20 ) in which the single-stage side utilization units ( 12 ,  13 ,  14 ) are connected in parallel with the heat source unit ( 11 ) by interconnecting piping lines ( 18 ,  19 ) refrigerant is circulated between each of the single-stage side utilization units ( 12 ,  13 ,  14 ) and the heat source unit ( 11 ) whereby single-stage compression refrigeration cycles are performed,
 wherein the length of return-side interconnecting piping lines respectively extending from outlet ports ( 24 ,  34 ,  44 ) of the single-stage side utilization units ( 12 ,  13 ,  14 ) to an inlet port ( 61 ) of the heat source unit ( 11 ) is set such that the aforesaid length becomes shorter as the compartment preset temperature in the single-stage side utilization units ( 12 ,  13 ,  14 ) connected respectively by the aforesaid return-side interconnecting piping lines to the inlet port ( 61 ) of the heat source unit ( 11 ) becomes lower.   
   
   
       5 . The refrigerating apparatus of any one of  claims 1 - 4 ,
 wherein in the return-side interconnecting piping line ( 19 ) composed of the return-side interconnecting piping lines establishing respective connections between the outlet ports ( 24 ,  34 ,  44 ) of the single-stage side utilization units ( 12 ,  13 ,  14 ) and the inlet port ( 61 ) of the heat source unit ( 11 ) the lowest of the single-stage side utilization units ( 12 ,  13 ,  14 ) in compartment preset temperature is connected at the most downstream side.   
   
   
       6 . The refrigerating apparatus of  claim 5 ,
 wherein in the supply-side interconnecting piping line ( 18 ) composed of supply-side interconnecting piping lines establishing respective connections between an outlet port ( 71 ) of the heat source unit ( 11 ) and inlet ports ( 23 ,  33 ,  43 ) of the single-stage side utilization units ( 12 ,  13 ,  14 ) the lowest of the single-stage side utilization units ( 12 ,  13 ,  14 ) in compartment preset temperature is connected at the most upstream side.   
   
   
       7 . The refrigerating apparatus of any one of  claims 1 - 4 ,
 wherein said refrigerating apparatus further includes a two-stage side circuit ( 47 ) in which a two-stage side utilization unit ( 15 ) having a cooling heat exchanger ( 51 ) configured to provide cooling of its associated compartment so that the associated compartment is kept at a predetermined preset temperature and a booster compressor ( 46 ) are connected in series;   wherein in the refrigerant circuit ( 20 ) the two-stage side circuit ( 47 ) is, together with the single-stage side utilization units ( 12 ,  13 ,  14 ), connected in parallel with the heat source unit ( 11 ) by the interconnecting piping lines ( 18 ,  19 ) and the refrigerant is circulated between the two-stage side utilization unit ( 15 ) and the heat source unit ( 11 ) whereby two-stage compression refrigeration cycles are performed.   
   
   
       8 . The refrigerating apparatus of  claim 7 ,
 wherein the two-stage side circuit ( 47 ) is connected at the most upstream side in the return-side interconnecting piping line ( 19 ) composed of the return-side interconnecting piping lines establishing respective connections between (i) the outlet ports ( 24 ,  34 ,  44 ) of the single-stage side utilization units ( 12 ,  13 ,  14 ) and an outlet port ( 54 ) of the two-stage side circuit ( 47 ) and (ii) the inlet port ( 61 ) of the heat source unit ( 11 ).   
   
   
       9 . The refrigerating apparatus of  claim 8 ,
 wherein the two-stage side circuit ( 47 ) is connected at the most upstream side in the supply-side interconnecting piping line ( 18 ) composed of the supply-side interconnecting piping lines establishing respective connections between (i) the outlet port ( 71 ) of the heat source unit ( 11 ) and (ii) the inlet ports ( 23 ,  33 ,  43 ) of the single-stage side utilization units ( 12 ,  13 ,  14 ) and an inlet port ( 53 ) of the two-stage side circuit ( 47 ).