期刊
ENERGY
卷 277, 期 -, 页码 -出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.energy.2023.127630
关键词
Pass-through all-glass ETC; Dewar tube; Thermal efficiency; Thermal expansion difference; Thermal stress
This article introduces a completely unique pass-through all-glass evacuated collector tube, which has a simple structure and can improve heat transfer efficiency and thermal energy utilization.
The collector tube could be a significant component of a solar water heater (SWH), that directly determines its performance and application eventualities. Here, a completely unique pass-through all-glass evacuated collector tube (ETC) is projected, which includes an easy structure composed inner and outer layers with each ends amalgamate along and no free ends. In addition, the flow pattern of the working medium in the tube also changes from laminar to turbulent flow, and natural convection changes to forced convection, greatly improving the convective heat transfer efficiency. Such a solar collector tube reaches 50% thermal efficiency at 54 degrees C in operation temperature and DNI = 1000W/m2, and might reach about 82 degrees C stagnation temperature at identical condition. Compared to standard Dewar tube, the pass-through ECT includes a higher thermal efficiency thanks to a lower inner layer temperature and better exit temperature. Completely different thermal expansions cause thermal stress within the glass structure, however the utmost stress between the inner and outer tubes was unbroken at intervals 40-120 MPa guaranteeing safe and stable operation at intervals the attainable temperature regime.
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