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The condensation heat transfer coefficients of pure refrigerants R-22, R-134a, and a binary refrigerant mixture R-410A flowing in a small diameter tube were investigated. The experiment apparatus consists of a refrigerant loop and a water loop. The main components of the refrigerant loop consist of a variable-speed refrigerant pump, a mass flowmeter, an evaporator, and a condenser(test section). The condenser is a counterflow heat exchanger with refrigerant flowing in the inner tube and water flowing in the annulus. It consists of smooth horizontal copper tube of 3.38 ㎜ OD and 1.77 ㎜ ID. The length of test section is 1220 ㎜. The refrigerant mass fluxes varied from 450 to 1050 ㎏/(㎡ㆍs) and the average inlet and outlet qualities were 0.05 and 0.95, respectively.
The main results were summarized as follows ; in the case of single-phase flow. The heat transfer coefficient of R-410A was higher than that of R-22 and R-134a, and the heat transfer coefficients for small diameter tubes were about 20% to 27% higher than those predicted by Gnielinski. In the case of two-phase flow, the heat transfer coefficients also increase with increasing mass flux and quality. The condensation heat transfer coefficient of R-410A was slightly higher than that of R-22 and R-134a. Most of correlations proposed in the large diameter tube showed significant deviations with experimental data except for the ranges of low quality and low mass flux.

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ABSTRACT

1. 서론

2. 실험장치 및 방법

3. 데이터 해석

4. 실험결과 및 고찰

5. 결론

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UCI(KEPA) : I410-ECN-0101-2009-553-015413786