基于吸气喷液的制冷系统热力性能理论研究

吸气喷液是降低压缩机排气温度的有效手段,通过建立制冷系统热力循环计算模型,研究基于吸气喷液的制冷系统热力学状态,以制冷剂R410A为工质,分析在不同工况下热力性能随喷液流量比例的变化趋势。计算结果表明,当喷液流量比例增加到5%时,排气温度平均降低幅度为9℃,功率、制冷量和COP值分别平均下降0.4%、0.6%和0.3%;若蒸发温度增加,功率呈先上升后下降的趋势,蒸发温度每增加5℃,排气温度平均降低幅度为4.5℃,制冷量、COP值分别平均增加17.6%、16.9%;冷凝温度每降低5℃,排气温度平均降低幅度为8℃,功率平均下降11.3%,制冷量、COP值分别平均增加6%、17.9%。

The oretical research on thermodynamic performances of refrigeration system based on suction injection

Suction injection is an effective method to reduce the discharge temperature of compressor. On the basis of the calculation model of thermodynamic cycle of refrigeration system, the thermodynamic state of refrigeration system based onsuction injection was studied based on the working fluid of refrigerant R410 A.The variation trends of thermodynamic performance at different working conditions of refrigeration system with mass flow ratio of suction injection were analyzed.The calculation results showsthat with the 5% increase of mass flow ratio of suction injection, the discharge temperatureaveragely decreases by 9 ℃, and the power, refrigerating capacity and COP averagelydecrease by 0.4%, 0.6% and 0.3%, respectively; if the evaporation temperature increases, the power increases first and then decreases; withthe 5 ℃ increase of the evaporation temperature, the discharge temperature averagely decreases by 4.5 ℃, and the refrigerating capacity and COP averagely increase by 17.6% and 16.9%, respectively; with the 5 ℃ decrease of the condensation temperature, the discharge temperature averagely decreases by 8 ℃, the power averagely decreases by 11.3%, and the refrigerating capacity and COP averagely increase by 6% and 17.9%, respectively.