The thermal performance of a two-accumulator self-pumping solar water heater is characterized in a daily simulation. The passive vapor transport system operates in cycles, alternating between run, pressurizing, and pump phases. Three isothermal closed-system thermodynamic models characterize the operational phases of the system. The applicable conservation of mass and energy equations of each model are combined in the numerical simulation. Instantaneous temperature and heat transfer rates, as well as integrated energy quantities and thermal efficiencies, are compared to experimental values. The qualitative behavior of the analytical model agrees with that of the physical system. Multiplying thermal loss coefficients by 2.5 and adjusting the theoretical solar model to correspond with measured insolation forces quantitative agreement of overall daily performance. The simulation reveals the impact of the duration of the pressurizing and pumping phases on overall performance. The volume and thermal capacitance of the components used during the pressurizing and pump phases should be minimized, while the insulation on those components should be maximized to optimize system performance. The validated model will be used in future work to optimize system design.
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August 1990
Research Papers
Analysis and Simulation of a Two-Phase Self-Pumping Water Heater
H. A. Walker,
H. A. Walker
Solar Energy Applications Laboratory, Colorado State University, Fort Collins, CO 80523
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J. H. Davidson
J. H. Davidson
Solar Energy Applications Laboratory, Colorado State University, Fort Collins, CO 80523
Search for other works by this author on:
H. A. Walker
Solar Energy Applications Laboratory, Colorado State University, Fort Collins, CO 80523
J. H. Davidson
Solar Energy Applications Laboratory, Colorado State University, Fort Collins, CO 80523
J. Sol. Energy Eng. Aug 1990, 112(3): 153-160 (8 pages)
Published Online: August 1, 1990
Article history
Received:
October 18, 1989
Revised:
February 26, 1990
Online:
June 6, 2008
Citation
Walker, H. A., and Davidson, J. H. (August 1, 1990). "Analysis and Simulation of a Two-Phase Self-Pumping Water Heater." ASME. J. Sol. Energy Eng. August 1990; 112(3): 153–160. https://doi.org/10.1115/1.2930474
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