低GWP工质闪蒸补气式高温热泵性能对比

高温热泵作为一种有效的节能技术可以满足大多数的工业用热需求,遴选安全、环保、高效的制冷剂是当前高温热泵技术研究的重要工作之一。针对闪蒸补气式高温热泵,基于EES（Engineering Equation Solver）软件建立系统数学模型,以性能系数（COP）、制热量、单位容积制热量、冷凝压力、压缩比以及压缩机排气温度为性能指标,在冷凝温度 ≥ 100℃,温升分别为40℃、50℃和60℃工况下,对R1224yd(Z)、R1233zd(E)、R1336mzz(Z)和R1234ze(Z) 四种氢氟烯烃制冷剂在闪蒸补气式热泵系统中的应用潜力进行分析,并与R245fa比较。结果表明,R1336mzz(Z) 的COP最大、冷凝压力最低,但单位容积制热量最小,相对适用于小容量供热系统;R1234ze(Z)的单位容积制热量最大,且COP与R245fa相当,是R245fa的良好替代工质,尤其适用于大容量高温升供热系统;R1233zd(E) 虽然单位容积制热量偏低,但其COP、制热量和冷凝压力相对R245fa具有显著优势,亦可作为R245fa的替代工质;与R245fa相比,R1224yd(Z) 的热力性能无明显优势。

Performance Comparison of Low GWP Refrigerant in Flash Tank Vapor Injection High-Temperature Heat Pump

High-temperature heat pumps, as an effective energy-saving technology, can meet most of the industrial heat demand. At present, selection of safe, environmental-friendly and efficient refrigerant is one of the important works in the research of high-temperature heat pump technology. Based on EES (Engineering Equation Solver) software, a mathematical model of the flash tank vapor injection (FTVI) high-temperature heat pump was developed. The application potential of four hydrofluoroolefin refrigerants r1224yd (z), r1233zd (E), r1336mzz (z) and r1234ze (z) in the FTVI heat pump system was analyzed and compared with R245fa under the conditions of condensation temperature ≥ 100^oC and temperature rise of 40 K, 50 K and 60 K respectively. Results showed that the COP of R1336mzz(Z) was the highest, while its condensing pressure was the lowest and its volumetric heating capacity was the smallest, make it relatively suitable for the system with small heating capacity. The volumetric heating capacity of R1234ze(Z) was the largest and its COP was comparable to R245fa, and thus it can be recommended as an excellent alternative to R245fa, especially for the system with large heating capacity under high temperature lift conditions. Compared to R245fa, though with relatively low volumetric heating capacity, R1233zd(E) has a significant advantage in COP, heating capacity and condensing pressure and thus can also be used as an alternative. R1224yd(z) has no obvious superiority in thermodynamic performance with R245fa as reference.