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CO2/R1233zd(E)混合工质回热热泵系统性能优化分析
邹德鑫, 赵朕, 杨凯寅, 王勤, 陈光明
0
(浙江大学制冷与低温研究所)
摘要:
空气源热泵作为一种新型的节能环保技术,在多种供暖场景中得到了广泛应用,其在低环境温度下的运行可靠性和效率是重要的关注点。采用二元混合工质CO2/R1233zd(E)构建了兼顾环保性、安全性和高效性的的回热热泵系统,并通过优化分析得到该系统的COP、单位容积制热量、吸气压力和排气压力等系统性能在-30~-10 ℃环境温度下的变化规律。通过与目前常用的传统补气增焓系统和复叠系统进行对比,探明了该混合工质回热系统在低环境温度下可以保持较高效率运行。在-30~-10 ℃环境温度下,与R134a补气增焓系统相比其COP和单位容积制热量分别减小了9.8%~20.6%和增大了3.5%~56.1%,并且压缩机压比以及压比随环境温度的变化幅度低于其它方案。二元混合工质回热系统结构简单,CO2和R1233zd(E)安全环保,因此提出的混合工质回热系统方案在低环境温度采暖的应用中具有独特优势。
关键词:  空气源热泵  回热循环  混合制冷剂  优化分析
DOI:
投稿时间:2023-03-17  修订日期:2023-06-20   录用日期:2023-07-31
基金项目:国家自然科学基金(51976179)资助项目。
Performance Optimization and Analyses on Recuperative Heat Pump System Using CO2/R1233zd €
Zou Dexin, Zhao Zhen, Yang Kaiyin, Wang Qin, Chen Guangming
(Institute of Refrigeration and Cryogenics, Zhejiang University)
Abstract:
Air-source heat pumps, as a new, energy-saving, and environmentally friendly technology, are widely applied in various heating applications, yet their reliable operational efficiency at low ambient temperatures is a concern. In this study, a simple, low-cost, and reliable heat pump system is constructed using safety and environmentally friendly binary refrigerant CO2/R1233zd(E), and the system performances such as the coefficient of performance (COP), volumetric heating capacity, suction pressure, and exhaust pressure are obtained through optimization analyses at ambient temperatures from -30 to -10 ℃. By comparing the vapor-injection heat pump system and cascade heat pump system, it was deduced that a recuperative heat pump system using a binary refrigerant can maintain high efficiency at low ambient temperatures. At ambient temperatures ranging from -30 to -10 ℃, the COP of the recuperative heat pump system decreases by 9.8% to 20.6%, whereas the volumetric heating capacity increases by 3.5% to 56.1% compared to the R410A vapor-injection heat pump system. Moreover, the compressor pressure ratio and its variation with ambient temperature are lower than other heat pump systems. Owing to the simple structure of the recuperative system and the adoption of the safe and environmentally friendly binary refrigerant CO2/R1233zd(E), the solution proposed in this study has unique advantages in heat pump applications in regions with low ambient temperatures.
Key words:  air source heat pump  heat regenerative cycle  mixed refrigerant  optimization analyses

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