Computational Technology Resources - CCP

Keywords: solar energy, flat plate collector, evacuated tube collector, useful energy gain, thermal efficiency, TRNSYS.

Summary

Evacuated tube collectors operate differently from the other collectors available in the market; these solar collectors consist of a heat pipe inside a vacuum-sealed tube. The vacuum envelope reduces convection and conduction losses, so the collectors can operate at higher temperatures than flat plate collectors. Like flat plate collectors, they collect both direct and diffuse radiation. However, their efficiency is higher at low incidence angles. The major purpose of these collectors is to collect as much solar energy as possible at the lowest possible total cost. In the study presented in this paper, the investigations of the performance of the collectors were done for two different climatic conditions (hot and cold) with the TRNSYS software.

In order to obtain a suitable outlet temperature (70-90 degrees Celsius), three collectors of each type were modelled in series. In this model, the inlet temperature of each collector was considered as the outlet temperature of the previous collector. For the collectors, of area 2.04 metres squared, an inlet flow rate of 50kg/hr and an inlet temperature of 15 degrees Celsius were considered. The collectors slope, based on the latitude of the selected zone in Iran, was considered to be 45 degree. The thermal efficiency is obtained by dividing the useful energy collected from a solar collector by the energy input. Based on this relation, the thermal efficiency is decreased with increasing the inlet temperature. Therefore, the first collector has a greater useful energy gain than the second. The useful energy gain from the second collector is more than the third one. The results demonstrate that the useful energy gain of evacuated tube collectors in a cold climate is more than flat plate collectors, whereas the useful energy gains of these collectors are closer to each other in a hot climate. On the other hand, the performance of the flat plate collector is more affected by the environmental conditions compared to the evacuated tube collector.

purchase the full-text of this paper (price £20)

go to the previous paper
go to the next paper
return to the table of contents
return to the book description
purchase this book (price £45 +P&P)

	Computational & Technology Resources an online resource for computational, engineering & technology publications
	not logged in - login
Front Page Browse CCP CSETS CTR IJRT Other Authors Search Purchase Guide FAQ Contact us	Civil-Comp Proceedings ISSN 1759-3433 CCP: 105 PROCEEDINGS OF THE NINTH INTERNATIONAL CONFERENCE ON ENGINEERING COMPUTATIONAL TECHNOLOGY Edited by: Paper 93 Comparing the Performance of Flat Plate Collectors and Evacuated Tube Collectors for Buildings and Industrial Usage T. Sokhansefat, A. Kasaeian, K. Rahmani and S. Mohasseb Faculty of New Science and Technologies, University of Tehran, Iran doi:10.4203/ccp.105.93 purchase the full-text of this paper Full Bibliographic Reference for this paper T. Sokhansefat, A. Kasaeian, K. Rahmani, S. Mohasseb, "Comparing the Performance of Flat Plate Collectors and Evacuated Tube Collectors for Buildings and Industrial Usage", in , (Editors), "Proceedings of the Ninth International Conference on Engineering Computational Technology", Civil-Comp Press, Stirlingshire, UK, Paper 93, 2014. doi:10.4203/ccp.105.93 Keywords: solar energy, flat plate collector, evacuated tube collector, useful energy gain, thermal efficiency, TRNSYS. Summary Evacuated tube collectors operate differently from the other collectors available in the market; these solar collectors consist of a heat pipe inside a vacuum-sealed tube. The vacuum envelope reduces convection and conduction losses, so the collectors can operate at higher temperatures than flat plate collectors. Like flat plate collectors, they collect both direct and diffuse radiation. However, their efficiency is higher at low incidence angles. The major purpose of these collectors is to collect as much solar energy as possible at the lowest possible total cost. In the study presented in this paper, the investigations of the performance of the collectors were done for two different climatic conditions (hot and cold) with the TRNSYS software. In order to obtain a suitable outlet temperature (70-90 degrees Celsius), three collectors of each type were modelled in series. In this model, the inlet temperature of each collector was considered as the outlet temperature of the previous collector. For the collectors, of area 2.04 metres squared, an inlet flow rate of 50kg/hr and an inlet temperature of 15 degrees Celsius were considered. The collectors slope, based on the latitude of the selected zone in Iran, was considered to be 45 degree. The thermal efficiency is obtained by dividing the useful energy collected from a solar collector by the energy input. Based on this relation, the thermal efficiency is decreased with increasing the inlet temperature. Therefore, the first collector has a greater useful energy gain than the second. The useful energy gain from the second collector is more than the third one. The results demonstrate that the useful energy gain of evacuated tube collectors in a cold climate is more than flat plate collectors, whereas the useful energy gains of these collectors are closer to each other in a hot climate. On the other hand, the performance of the flat plate collector is more affected by the environmental conditions compared to the evacuated tube collector. purchase the full-text of this paper (price £20) go to the previous paper go to the next paper return to the table of contents return to the book description purchase this book (price £45 +P&P)
Back to top	©Civil-Comp Limited 2023 - terms & conditions