Temperature distributions along the absorber of the axicon solar fluid heater

M. F. El-Refaie

Applied Energy, 1987, vol. 26, issue 3, 217-241

Abstract: Mathematical formulae are derived to express the fluid and the absorber-wall temperatures as functions of the position along the absorber reckoned from the inlet. The expressions are put in a general form in terms of a limited number of dimensionless groups. Two types of flow arrangements are identified, namely counter flow and parallel flow. The counter-flow heater is always superior to the parallet-flow one because it yields a higher output temperature under all conditions. The effects of the various parameters on the fluid temperature at the exit from the heater are investigated. Consequently, different methods of elevating the output temperature are proposed.

Date: 1987
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