Long-term thermodynamic performance of solar heat and power systems

N.E. Wijeysundera and J.C. Ho

Applied Energy, 1986, vol. 24, issue 1, 43-63

Abstract: This paper describes a long-term simulation study of solar thermal systems incorporating second-law considerations. Both open-loop and closed-loop heat collecting configurations are simulated using hourly meteorological data. The entropy generation in each subcomponent is calculated on an hourly basis to obtain the yearly mean second-law efficiency. The effects of load temperature, mode of operation, collector type, collector area and storage tank size are investigated. Some results are presented for a solar-Rankine power plant using R-12 and R-22 as the working fluids. The use of the plate temperature as the [`]source' temperature gives an optimal collector size which maximizes the second-law efficiency. When the equivalent [`]sun' temperature is used, the second-law efficiency decreases with collector area for both types of heating system.

Date: 1986
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