A long term system performance for a stratified solar storage container

E.A.E. Eldessouky

Renewable Energy, 1993, vol. 3, issue 6, 633-643

Abstract: A stratified solar storage container was designed with the main object of promoting and stabilizing stratification as a basis for improving the overall efficiency of a solar water heating system. Tests were conducted on a cylindrical water filled storage container of L/D equal to 3:1 and capacity of (500 kg) using a low cost stimulator. The design of the simulator was based on a relatively inexpensive micro-computer linking into a mains power regulator with an 8-bit digital control system (0–255 useful states) which drives a resistor chain. The output from this network is a voltage which determines the power level of an electrical heater in an 11.5 litre water filled copper vessel. With any useful energy profile of interest the user is able to control, through the micro-computer, the logic level of the userport and decide on the time step interval for the test by acessing the internal clock of the micro-computer. Meteorological data were used to compute radiation income on any inclined plane, and the output to the power regulator is controlled by the computed instantaneous rate of energy gain from the collector system undergoing simulation. The stimulator could be used to stimulate any solar water heating system, apart from the storage container. It is particularly useful in estimating long term system performance. Therefore, the long term system performance for the storage container was determined and the long term system efficiency was found to be 52%.

Date: 1993
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Persistent link: https://EconPapers.repec.org/RePEc:eee:renene:v:3:y:1993:i:6:p:633-643

DOI: 10.1016/0960-1481(93)90070-W

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