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  • EXPERIMENTAL DEMONSTRATION OF A HIGH PERFORMANCE FLAT PLATE COLLECTOR FIELD WITH ISOTHERMAL HEAT TRANSPORT AND HEAT STORAGE IN A STRATIFIED WATER TANK

Abstract

In ordinary solar flat plate collector plants a liquid heat transport medium is circulated with a pump according to the insolation. Thereby the need of electricity, the morning preheating bypass and the elevated collector temperature are disadvantageous. Beside the first demonstration of MBB high performance flat plate collectors the objective of the described programme is to prove that these disadvantageous can be avoided. Circulating water is driven by gravity in form of steam at the hot side and in the liquid phase at the cold side. Temperature is determined by the pressure of the gas buffer. Preheating occurs by natural liquid convection, at higher insolations boiling starts automatically. Elevated collector temperature is eliminated by the high heat transfer due to phase change, by compensation of pipe heat losses without temperature drop (isothermal condensation) and by a uniform temperature all over the collector field. The high performance of the evacuated flat plate collectors could be roved. In 15 month exposure between - 20 degrees C and + 160 degrees C no mechanical and thermal problems arose.

Additional information

Authors: MERGES V, MESSERSCHMITT-BOELKOW-BLOHM GMBH, MUENCHEN (GERMANY);KLIPPEL E MESSERSCHMITT-BOELKOW-BLOHM GMBH, MUENCHEN (GERMANY), MESSERSCHMITT-BOELKOW-BLOHM GMBH, MUENCHEN (GERMANY)
Bibliographic Reference: EUR 8798 DE-EN (1983) MF, 45 P., BFR 120, BLOW-UP COPY BFR 225, EUROFFICE, LUXEMBOURG, POB 1003
Availability: Can be ordered online
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