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An investigation of a heat pump system using CO2/propane mixture as a working fluid

机译：使用CO2 /丙烷混合物作为工作流体的热泵系统的研究

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摘要

In order to decrease the heat rejection pressure of heat pump using pure working fluid, CO2 or R744, other natural component including hydrocarbons (R290, R600a, R600, R1270, R170, R601) and dimethyl ether (RE170) is added to CO2, respectively, and then six binary mixtures are achieved. By environmental and thermodynamic comparisons, R290 is selected to be the most appropriate component candidate to mix with CO2, and meanwhile to weaken the flammability and explosivity for pure R290. Then, the system performances of heat pump using mixture of CO2 and R290 were experimentally studied when R290 is added to CO2 with a small fraction, and compared with that of the pure CO2. The experimental test rig is designed and set up for the transcritical heat pump system. When the refrigerant charge is variable, the heating coefficient performance, optimum heat rejection pressure, compressor power, mass flow rate of refrigerant, and total heat coefficient of gas cooler were researched. The variation ratios of heating coefficient performance and heating capacity with deviation from the optimum refrigerant charge were also investigated. The optimum refrigerant charge of CO2/R290 is obtained and the research results show that the addition of R290 to CO2 can efficiently reduce the heat rejection pressure and improve the system performance. The results in the present work could provide useful guidelines for the design and operation of heat pump system using CO2-based mixture.
机译：为了降低使用纯工作流体，CO2或R744的热泵的排热压力，分别将其他自然成分（包括碳氢化合物（R290，R600a，R600，R1270，R170，R601）和二甲醚（RE170））添加到CO2中，然后获得六种二元混合物。通过环境和热力学比较，R290被选为最适合与CO2混合的组分，同时削弱了纯R290的可燃性和爆炸性。然后，当将R290少量添加到CO2中并与纯CO2进行比较时，通过实验研究了使用CO2和R290的混合物的热泵的系统性能。为跨临界热泵系统设计并设置了实验测试台。当制冷剂充注量可变时，研究了热系数性能，最佳排热压力，压缩机功率，制冷剂质量流量和气体冷却器的总热系数。还研究了热系数性能和热容量随最佳制冷剂充注量的变化率。获得了最佳的CO2 / R290制冷剂充注量，研究结果表明，在CO2中添加R290可以有效降低排热压力，提高系统性能。本工作的结果可为使用基于CO2的混合物的热泵系统的设计和运行提供有用的指导。

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