진동형 히트파이프를 이용한 이중 진공관 태양열 집열기의 성능평가

Abstract

It is increasing interests of the environment. It make efforts to saving a energy conservation. From the viewpoint of low cost as well as short construction schedule for the manufacturing of heat exchanger, flexibility, simplification and high performance, PHP(Pulsating heat pipe) draws special attention in these points. So, in this paper, the thermal performance of evacuated solar collector using the pulsating heat pipe was investigated. We investigated a optimized working fluid on solar collector and charging ratio. One of the important things is collective efficiency of the evacuated solar collector. The evacuated solar collectors with the shape of the heat pipe were investigated in the same operating condition for a outdoor experiment equipment. The experimental conditions are as follows ; The charging ratio of working fluid was 50%, 70%, 100% of evaporation section volume. The inclimation angle was 35？ from the fround. The mass flow rate is 1 〜 2 kg/min. the working fluid is R-141b, R-142b, R-134a and Etyl Alcohol. Optimum working fluid was Etyl Alcohol, its charging ratio is 100% to volume. In this study shows that 6.35 mm diameter was higher efficieincy of collected heat than 4.76mm diameter.