CO_(2)跨临界热泵高温化途径分析  

ANALYSIS ON APPROACHES FOR INCREASING HEAT SUPPLYING TEMPERATURE OF CO_(2) TRANSCRITICAL HEAT PUMP

作　　者：史维秀 纪雪园 潘利生[2] 吕一帆 魏小林[2] Shi Weixiu;Ji Xueyuan;Pan Lisheng;Lyu Yifan;Wei Xiaolin(School of Environmental and Energy Engineering,Beijing University of Civil Engineering and Architecture,Beijing 100044,China;State Key Laboratory of High Temperature Gas Dynamics,Institute of Mechanics,Chinese Academy of Sciences,Beijing 100190,China)

机构地区：[1]北京建筑大学环境与能源工程学院,北京100044 [2]中国科学院力学研究所高温气体动力学国家重点实验室,北京100190

出　　处：《太阳能学报》2022年第4期104-111,共8页Acta Energiae Solaris Sinica

基　　金：国家自然科学基金(51776215);北京市自然科学基金(3192042);北京建筑大学市属高校基本科研业务费专项资金(X20058)。

摘　　要：CO_(2)作为一种环境友好的自然工质,以其为循环工质的跨临界热泵制热能力突出。建立CO_(2)跨临界增压和CO_(2)跨临界热泵理论分析模型,研究不同增压过程对热泵系统COP、气冷器中水的出口温度及质量流量的影响规律。结果表明,2种热泵高温化方案均会提升压缩机等熵效率、功耗和压缩机出口工质温度,且提升了气冷器出口水温,但COP和热水的质量流量有所降低。综合来看,随气冷器出水温度的增加,增大压缩机吸气过热度的循环耗功上升幅度较小,但COP下降幅度较大,可在小范围内提升热水温度;提高压缩机出口压强能获得更高的热水温度,可控范围更大,且COP降低幅度较小。The transcritical heat pump with CO_(2),an environmentally friendly natural working fluid,shows great potential in high temperature heating.A CO_(2)transcritical pressurization analysis model and a CO_(2)transcritical heat pump analysis model have been established.Based on them,the effects of different pressurization processes on COP,outlet temperature and mass flow rate of water in gas cooler are studied.The results show that both approaches can improve the isentropic efficiency,power and outlet working fluid temperature of the compressor,and increase the outlet water temperature of the gas cooler,but decrease the COP and hot water mass flow.In general,when increasing the outlet water temperature of gas cooler,the approach of increasing the suction superheat makes power increases slightly,but the COP decreases greatly,which can increase hot water temperature in a small range.By increasing the compressor outlet pressure,the hot water temperature is higher,the controllable range is larger,and COP has a smaller decline.

关 键 词：二氧化碳 热泵系统 高温应用 离心式压缩机 

分 类 号：TB61[一般工业技术—制冷工程]