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  • SPONTANEOUS DOWNWARD HEAT TRANSPORT SYSTEM. QUANTITATIVE DETERMINATION OF THE OVERALL EFFICIENCY IN COMPARISON TO A CONVENTIONAL CIRCUIT WITH CIRCULATION PUMP

Abstract

A new system for spontaneous downward transport of heat has been implemented in one or two equal hot water solar circuits, one of them corresponding to a conventional forced circulation circuit. The two systems were compared. Each circuit comprised 4 m2 of thermal collectors and a water reservoir of 200 dm2 placed about 9 m below the collectors (domestic distance). Both circuits were operated under the same conditions. Outdoor test parameters were the amount of water extracted and its minimum delivery temperature, hours of the day when water is extracted, and the setting of the differential thermostat. The efficiency of the forced circulation system was shown to be slightly better only in the low temperature range (temperature of the water store below about 30circC) or with low daily irradiation values. Under other conditions, particularly in the case of a single water draw-off at the end of the day, the spontaneous system is more efficient. It also promises high reliability and the ability to work without need of electrical energy.

Additional information

Authors: DE BENI G, JRC-ISPRA;FRIESEN R JRC-ISPRA, JRC-ISPRA
Bibliographic Reference: ISES SOLAR WORLD CONGRESS 1987, HAMBURG/D, SEPT. 13-18, 1987, AVAILABILITY: CEC-LUXEMBOURG, DG XIII/A2, BP 1907, MENTIONING PAPER ORA 33564 E
Availability: Can be ordered online
Record Number: 1989126062000 / Last updated on: 1989-05-01
Category: PUBLICATION
Available languages: en