NASA NTRS · 19800000051
Evacuated-tube solar collector--performance evaluation
Abstract
Report gives thermal performance test procedures and results for commercially produced, water-filled, 8-tube collectors. Tests include efficiency, time constant for temperature drop after solar flux is cut, change in efficiency as function of sun angle, and test to see if tubes break when filled with hot water.
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1980-08-01. Evacuated-tube solar collector--performance evaluation. https://ntrs.nasa.gov/citations/19800000051
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