A Long Term Test of Differently Designed Evacuated Tubular Collectors

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Abstract

During three years seven differently designed evacuated tubular collectors (ETCs) utilizing solar radiation from all directions have been investigated experimentally. The evacuated tubular solar collectors investigated include one SLL all-glass ETC from Tshinghua Solar Co. Ltd, four heat pipe ETCs and one direct flow ETC from Sunda Technolgoy Co. Ltd and one all-glass ETC with heat pipe from Exoheat AB. The collectors have been investigated side-by-side in an outdoor test facility for a long period. During the measurements, the operating conditions – such as weather conditions and temperature of the inlet fluid to the collectors have been the same for all collectors. The volume flow rate through each of the collectors is adjusted so that the mean solar collector fluid temperature has been the same for all collectors. Thus a direct performance comparison is possible. The side-by-side tests were carried out with different mean solar collector fluid temperatures and in different seasons of the year. The results of the measurements are presented in this paper. The influence of the mean solar collector fluid temperature on the thermal performance of the different collector designs will be discussed. Further, the collector performances are compared for different times of the year and it is illustrated how the performance of the different collector types depends on weather conditions.
Original languageEnglish
Title of host publicationEuroSun 2008 : 1st International Conference on Solar Heating, Cooling and Buildings
Place of PublicationLisbon, Portugal
Publication date2008
Publication statusPublished - 2008
Event1st International Conference on Solar Heating, Cooling and Buildings - Lisbon, Portugal
Duration: 7 Oct 200810 Oct 2008
Conference number: 1
https://www.ises.org/ISES.nsf/5c990687ba31ff01c12568b3004ef917/4ecf2fc5e808b5eec125744a0041e0fe?OpenDocument

Conference

Conference1st International Conference on Solar Heating, Cooling and Buildings
Number1
CountryPortugal
CityLisbon
Period07/10/200810/10/2008
Internet address

Keywords

  • Test
  • Collector design
  • Thermal performance
  • Evacuated tubular solar collector

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