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Large scale test of a novel back-pass non-perforated unglazed solar air collector

Author:
Miguel A. Paya-Marin  James B.P. Lim  Jian-Fei Chen  R. Mark Lawson  Bhaskar Sen Gupta  


Journal:
Renewable Energy


Issue Date:
2015


Abstract(summary):

Abstract This paper describes large scale tests conducted on a novel unglazed solar air collector system. The proposed system, referred to as a back-pass solar collector (BPSC), has on-site installation and aesthetic advantages over conventional unglazed transpired solar collectors (UTSC) as it is fully integrated within a standard insulated wall panel. This paper presents the results obtained from monitoring a BPSC wall panel over one year. Measurements of temperature, wind velocity and solar irradiance were taken at multiple air mass flow rates. It is shown that the length of the collector cavities has a direct impact on the efficiency of the system. It is also shown that beyond a height-to-flow ratio of 0.023 m/m³/hr/m 2 , no additional heat output is obtained by increasing the collector height for the experimental setup in this study, but these numbers would obviously be different if the experimental setup or test environment (e.g. location and climate) change. An equation for predicting the temperature rise of the BPSC is proposed. Graphical abstract Highlights • A back-pass solar collector (BPSC) wall panel monitored over one year. • Temperature, wind velocity and solar irradiance measured at multiple flow rates. • The length of the collector cavities directly affects the efficiency of the system. • Above a certain height-to-flow ratio no further heat output by longer collector. • A model for predicting the temperature rise of the BPSC is proposed.


Page:
871-871


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