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Abstract

Based on the simple idea of a periodically operating absorption heat pump, a directly fired type has been designed and built for space heating applications. The heat input is accomplished by means of a natural gas burner sized at approximately 10 kW and the low temperature heat source is furnished by the ambient air. Prior to the design, extensive investigations have been performed to determine the heat and mass transfer rates in the necessary components. In a laboratory size unit the transport phenomena for the ternary mixture methanol - water - lithium bromide have been measured first. Further on boiling tubes with varying geometries have been examined concerning their suitability as a generator with convective circulation. The performed investigations showed that a periodically operating absorption heat pump operates well and can be improved further on to become a heating device of high efficiency. However, the mechanical design remains quite simple and the operation is easy to regulate and to control.

Additional information

Authors: KNOCHE K F, RWTH AACHEN (GERMANY);GRABENHENRICH H B RWTH AACHEN (GERMANY), RWTH AACHEN (GERMANY)
Bibliographic Reference: EUR 9788 EN (1985) MF, 54 P., BFR 150, BLOW-UP COPY BFR 270, EUROFFICE, LUXEMBOURG, POB 1003
Availability: Can be ordered online
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