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Development of a simulation program for high-temperature and high-performance heat pumps.

开发高温高性能热泵模拟程序。

基本信息

批准号：
62850037
负责人：
SAITO Takamoto
金额：
$ 6.53万
依托单位：
The University of Tokyo
依托单位国家：
日本
项目类别：
Grant-in-Aid for Developmental Scientific Research
财政年份：
1987
资助国家：
日本
起止时间：
1987 至 1988
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-62850037/
关键词：
Heat Pumps Non-azeotropic Refrigerant Mixtures Simulation Heat Pump Cycles Energy Savings Mass Transfer

项目摘要

In comparison with conventional single-component refrigerants, the application of refrigerant mixtures in high temperature heat pumps may result in a higher coefficient of performance, lower condensing pressure, and higher reliability. But it is well known that the boiling and condensation heat transfer coefficients of binary mixtures are reduced due to the mass transfer effects compared with single-component refrigerants. Main purpose of this study is to develop a computer program for simulating refrigeration cycles of mixed refrigerants.Simple models for evaluating the mass transfer effects on boiling heat transfer and condensation heat transfer were developed. In both boiling and condensation heat transfer, mass diffusion layer near the gas-liquid interface causes the increase in heat transfer resistance. To investigate the feasibility of high temperature heat pumps with mixed refrigerants, the simulation program was used.In order to confirm the simulation program including heat transfer models, a heat pumptest rig was constructed, which consisted of water-cooled or -heated counterflow heat exchangers and an open-type-compressor. The COP and the heat transfer performance for the pure refrigerants R12 and R22 and the mixtures R22 with R114 in different compositions were measured. The comparisons between the simulated and experinental results of heat transfer coefficients and the COP were satisfactorily good. When the heat transfer area of heat exchangers is large enough and the temperature increase of the heat sink fluid at the condenser is large, the COP can increase.

与传统的单组分制冷剂相比，混合工质在高温热泵中的应用可以获得更高的性能系数、更低的冷凝压力和更高的可靠性。但众所周知，与单组分制冷剂相比，由于传质效应，二元混合工质的沸腾和冷凝换热系数都有所降低。本研究的主要目的是开发一种计算机程序来模拟混合制冷剂的制冷循环，并建立简单的模型来评价传质对沸腾换热和冷凝换热的影响。无论是沸腾换热还是冷凝换热，气液界面附近的质量扩散层都会导致换热阻力的增大。为了研究混合工质高温热泵的可行性，利用模拟程序对模拟程序进行了验证，建立了一台由水冷或加热逆流换热器和开式压缩机组成的热泵试验台。对纯工质R12和R22以及R22与R114在不同组成下的COP和换热性能进行了测试。换热系数和COP的模拟结果与实验结果进行了比较，结果令人满意。当换热器的换热面积足够大，冷凝器处散热器流体的温升较大时，COP可以增加。