冷源冷量对压缩/喷射制冷系统性能影响的实验研究

实验研究了喷射器的最优喷嘴距及在此条件下,冷凝器进水冷量对喷射器及双蒸发压缩/喷射制冷系统性能的影响,同时对双蒸发压缩/喷射制冷系统与蒸汽压缩制冷系统进行了对比研究。结果表明:喷射器引射系数随冷凝器进水冷量的增大而减小,喷射器升压比随冷凝器进水冷量的增大而增大;双蒸发压缩/喷射制冷系统COP_P随冷凝器进水冷量的增加先快速增加后缓慢减小,冷凝器进水冷量存在一个合理值,当冷凝器进水冷量控制在17.81 kW时,系统性能最好;高温蒸发器的制冷量约占系统总制冷量的88%,低温蒸发器的制冷量约占系统总制冷量的12%;在不同的冷凝器进水冷量下,双蒸发压缩/喷射制冷系统比蒸汽压缩制冷系统COP提高约36%左右。

Experimental study of cooling capacity on performance of bi-evaporator compression/ejection refrigeration system

The effects of condenser inlet water cooling capacity on the performance of ejector and bi-evaporator compression/ejection refrigeration cycle(BCERC) were experimentally investigated at the optimal nozzle exit position. A comparative study between the BCERC system and the vapor compression refrigeration cycle(VCRC) system under the same external operating conditions was conducted. Results show that the ejector entrainment ratio(ER) decreases with the rising of condenser inlet water cooling capacity. The pressure lift ratio(PLR) of ejector increases with the rising of condenser inlet water cooling capacity. The COP_P of BCERC system increases rapidly and peaks at the condenser inlet water cooling capacity of 17.81 kW with the maximum COP_P. Continuing to increase the condenser inlet water cooling capacity, the COP_P starts to decrease slowly. The refrigerating capacity of the high-temperature evaporator accounts for about 88% of the total refrigerating capacity of the system, and that of the low-temperature evaporator accounts for about 12% of the total refrigerating capacity of the system. The BCERC system performs better than the VCRC system under different condenser inlet water cooling capacities, and COP can increase by 36%.