【摘要】 提出了热电过冷器-膨胀机耦合CO₂跨临界制冷循环（TES+EXP）,可实现热电过冷器、膨胀机和压缩机之间的电能平衡分配。对新构型各部件及循环整体的不可逆损失及?效率进行了详细分析,并与三种构型CO₂跨临界循环进行了对比。结果表明TES+EXP循环的?效率明显高于热电过冷（TES）循环,在过冷度为10℃时,?效率提高7.4%。排气压力和过冷度是影响TES+EXP循环单位制冷量不可逆损失iTot的关键因素,循环在最优排气压力和过冷度时存在最小iTot,在标准工况下,TES+EXP循环相对传统CO₂跨临界制冷循环,最小iTot降低了39.9%;气冷器出口温度为46℃时,最优高压减小了2.0 MPa。推荐新型循环应用于气候炎热地区。更多还原

【Abstract】 A novel CO₂ transcritical refrigeration cycle（TES+EXP） was proposed,which can achieve electric energy balance distribution between the thermoelectric subcooler,the expander and the compressor. The irreversible loss and exergy efficiency of each component and the overall TES+EXP cycle of the new configuration were analyzed in detail and compared with other three configurations of CO₂ transcritical cycles. The results show that the exergy efficiency of TES+EXP cycle was substantially higher than that of the thermoelectric subcooling cycle（TES）,which was improved by 7.4% at subcooling degree of 10 ℃.The exhaust pressure and subcooling degree are two key parameters affecting the irreversible loss per unit cooling capacity（iTot） of TES+EXP cycle.There exists a minimum iTot at the optimum exhaust pressure and subcooling degree. The minimum iTot was reduced by39.9% for TES+EXP cycle compared with traditional CO₂ cycle.Moreover,the optimum exhaust pressure was reduced by 2.0 MPa at 46 ℃ outlet temperature of the gas cooler. It is recommended that the new cycle is applied in the hot regions.更多还原