Experimental Research of an All-Glass Evacuated Tubular Solar Water Vapor Generator

Abstract

Abstract:

A new-type all-glass evacuated tubular solar water vapor generator was designed and tested to provide flowing high temperature water vapor. The experimental apparatus consists of 60 linked collecting units, each mainly includes a simplified CPC, an allglass evacuated collecting tube and a heat transfer annular pipe amounted in the evacuated collecting tube. A special solidliquid mixed medium with high thermal conduction is filled between allglass evacuated tube and annular tube. The collecting performance of the apparatus was investigated for understanding the effect of weather condition conditions and collecting unit design on the vapor temperature, collecting power and system efficiency. Experimental results show that the vapor temperature in the outlet of the collector can reach 200 ℃, while the collector efficiency is above 0.332, which manifests excellent solar collecting performance. The present new solar water vapor generator demonstrates industrial potentiality and provides a good technology support for solar high temperature collecting system.

Key words: solar energy, water vapor generator, all-glass evacuated tube, heat transfer annular pipe

CLC Number:

TK 515

LI Shuangshuang,LIU Zhenhua. Experimental Research of an All-Glass Evacuated Tubular Solar Water Vapor Generator[J]. Journal of Shanghai Jiaotong University, 2014, 48(06): 778-781.

References

［1］司徒伟光，代彦君，王如竹.采用真空管太阳能吸附集热器的制冷系统性能分析［J］.上海交通大学学报,2002,36(2):206209.

SITU Weiguang, DAI Yanjun, WANG Ruzhu. Perfomance analysis on solar adsorption refrigeration using vacuum tube adsorber［J］. Journal of Shanghai Jiaotong University, 2002, 36(2):

206209.

［2］Tang R S, Yang Y Q, Gao W F. Comparative studies on thermal performance of wateringlass evacuated tube solar water heaters with different collector tiltangles［J］. Solar Energy, 2011,85(7):13811389.

［3］Budihardjo I, Morrison G L. Performance of wateringlass evacuated tube solar water heaters［J］. Solar Energy, 2009，83(1)：4956.

［4］Winston R. Principles of solar concentrators of a novel design［J］. Solar Energy,1974,16(2):8995.

［5］Buttinger F, Beikircher T, Proll M, et al. Development of a new flat stationary evacuated CPCcollector for process heat applications［J］. Solar Energy,2010,84(7):11661174.

［6］Li M, Zhu Y Z, Yang M C, et al. Performance study of a 7 m2 multitrough type CPC(Compound Parabolic Collector) light concentration and heat collector ［J］. Journal of Engineering for Thermal Energy & Power,2013,28(5):535539.

［7］Ning J J, Zhu Y Z, Chen H J, et al. Experimental study of a novel CPC heat pipe coupled vacuum tube solar water heater ［J］. Vacuum, 2012,49(4):9791.

［8］Khonkar H E I, Sayigh A A M. Optimization of the tubular absorber using a compound parabolic concentrator［J］. Renewable Energy, 1995,6(1):1721.

［9］Eames P C, Norton B. Thermal and optical consequences of the introduction of baffles into compound parabolic concentrating solar energy collector cavities［J］. Solar Energy, 1995,55(2):139150.

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