VALIDATION OF SIMULATION MODELS FOR DIFFERENTLY DESIGNED HEAT-PIPE EVACUATED TUBULAR COLLECTORS
Differently designed heat-pipe evacuated tubular collectors have been investigated theoretically and experimentally. The theoretical work has included development of two TRNSYS (1) simulation models for heat-pipe evacuated tubular collectors utilizing solar radiation from all directions. One model is developed for heat-pipe evacuated tubular collectors with flat fins and one model is developed for heat-pipe evacuated tubular collectors with curved fins. The models are characterized by detailed calculations of the heat transfer processes in the fins, by detailed shadow modeling and by fins with selective coating on both sides. The input to the models is thus not a simple collector efficiency expression but the actual collector geometry. In this study, the TRNSYS models are validated with measurements for four differently designed heat-pipe evacuated tubular collectors. The collectors are produced by the Chinese collector manufacturer SUNDA Technology Co. The collectors have either flat or curved fins inside the evacuated tubes, the tubes have different diameters and the fins have selective coating on both sides. The collectors thermal performances have been measured side-by-side under the same operation conditions in an outdoor test facility. For periods with different operation conditions – such as weather conditions and inlet temperatures – measured and calculated thermal performances are compared for the four collectors. Further, the measured and calculated dynamic behaviors are compared. In all four cases, a good degree of similarity between measured and calculated results is found. With these validated models detailed parameter analyses and collector design optimization are now possible.
Jianhua Fan Janne Dragsted Simon Furbo
Department of Civil Engineering, Technical University of Denmark Brovej, Building 118, DK-2800 Kgs Lyngby, Denmark
国际会议
2007世界太阳能大会(Proceedings of ISES Solar World Congress 2007)
北京
英文
2007-09-18（万方平台首次上网日期，不代表论文的发表时间）