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ECN publication
Measurement results of a hybrid adsorption-compression heat pump based on a roots compressor and silica gel-water sorption cycle
Published by: Publication date:
ECN Efficiency & Infrastructure 11-3-2011
ECN report number: Document type:
ECN-M--11-029 Conference Paper
Number of pages: Full text:
9 Download PDF  

Thermally driven sorption systems can provide significant energy savings, especially in industrial applications. The driving temperature for operation of such systems limits the operating window and can be a barrier for market-introduction. By adding a work-driven compressor, the heat-driven cycle can be made with waste heat at lower temperatures. In this paper such heat pumps, using both the work potential from waste heat and work from a compressor, will be referred to as hybrid heat pumps.

ECN has a long history on sorption heat pump research, including both silica gel-water as well as ammonia-salt sorption systems, and has recently started the development of a hybrid heat pump. The final goal is to develop a hybrid heat pump for upgrading lower (<100°C) temperature industrial waste heat to above pinch temperatures. This heat pump will likely be based on the adsorption and desorption of ammonia on ammonia-salts and combine the continuous process of the compressor with the batch operated sorption reactors. The compressor for these heat pumps will typically run at a low pressure ratio (<3), to achieve high energy efficiency, and at relatively high volume-flows (>1000 m3/hr).

The first tests on a hybrid heat pump are, however, conducted on a silica gel-water system that has been thoroughly tested earlier, in combination with a roots compressor. This paper will present the results of measurements on this hybrid heat pump system.

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