| 摘要: |
| 根据制冷剂研发准则，兼顾制冷剂的循环性能、热物性、环保性及可燃性，提出了5对适用于复叠式中高温热泵且温度滑移很小的混合制冷剂。复叠式热泵系统低温级的制冷剂方案为R161/R1234yf或R161/R290，而高温级为R152a/RE170、R152a/R1243zf、或R245fa/R1234zeZ。与常规的R22+R134a方案进行对比分析，发现当制取80 ℃热水时，R161/R1234yf + R152a/RE170方案和R161/ R290+ R152a/RE170方案综合性能最优，在计算工况下，COP最高可达1.58，但需注意其易燃易爆性。高温级制热循环若使用R245fa/R1234zeZ，则可降低系统在易燃和高压方面的风险，冷凝温度可提高至120 ℃（压力约2.1 MPa），若能再配套更大容积的压缩机，则效果更佳。 |
| 关键词: 制冷剂 热泵 温室效应 可燃性 |
| DOI： |
| Received:November 01, 2017 |
| 基金项目:国家自然科学基金（51606024），中国博士后科学基金（2016M591427），中央高校基本科研业务费（DUT17JC31）资助项目。 |
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| Analysis of Available Blend Refrigerants for Medium-high Temperature Cascade Heat Pump |
|
Wu Xi1, Xu Shiming1, Liu Jiawei1, Dai Xiaojun2, Zhao Wenzhong1
|
| (1.Key Laboratory of Ocean Energy Utilization and Energy Conservation of Ministry of Education，School of Energy and Power Engineering, Dalian University of Technology;2.Panasonic Appliances Cold Chain (Dalian) Co., Ltd.) |
| Abstract: |
| Five pairs of binary blend refrigerants with small temperature glides are proposed to be used in medium-high temperature cascade heat pumps according to the results of theoretical comparative studies, including thermophysical properties, cycle performance, environmental impact, and flammability of several potential working fluids under the refrigerants developing criterion. While R161/R1234yf and R161/R290 are found to be suitable to the sub-system of the low-temperature heating cycle, R152a/RE170, R152a/R1243zf, and R245fa/R1234zeZ are practical in the high-temperature heating cycle sub-system. Compared to the common cascade heat pump running with refrigerants R22+R134a, it is discovered that blend refrigerants that consist of R161/R1234yf+R152a/RE170 or R161/R290+R152a/RE170 possess optimal comprehensive performances. These blend refrigerants have the highest coefficient of performance （COP） of 1.58, under hypothetical working conditions for producing hot water at 80 °C. Special attention should be paid to their flammability. When using R245fa/R1234zeZ in the sub-system of high-temperature heating cycle, both the high pressure and flammability risk can be reduced significantly. In addition, the condensing temperature of system can be as high as 120 °C (about 2.1 MPa in pressure), and it would be better if using the compressor with a large working volume. |
| Key words: refrigerant heat pump global warming effect flammability |
