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Experimental analysis of a small-capacity ammonia/water absorption heat pump using a novel concept of a "thermally driven" solution pump.

Number: pap. n. 121

Author(s) : ZOTTER G., RIEBERER R.

Summary

For small-capacity ammonia/water absorption beat pumping system with an evaporator capacity below 20 kW, there are only a few electrically driven solution pumps available on the market In order to improve this situation a "thermally driven" solution pump can be considered, which offers several advantages, as e.g. an oil-free, leak-proof and simple design with low maintenance effort. "Thermally driven" means that the pump is internally driven by a thermodynarnic power process within the absorption beat pumping cycle. In this particular way, a portion of vaporized refrigerant from the generator is used to lift up the pressure of the rich solution, similar to other alternative pump concepts. However, this novel concept ("ThermoPump") can be easily integrated into any plant without special efforts regarding its basic layouts. A prototype of the ThermoPump has been designed, constructed and experimentally investigated in an absorption beat pumping system available on the market (PinkChiller PC19). It is shown that the ThermoPump works without any relevant operating-limits, leakage, cavitation problems nor negative influence on the dynamic behavior of the PinkChiller. However, the measured the COP ofPinkChiller decreases by at least 15% due to the ThennoPump (in comparison to an electrical pump), depending on the operating conditions of the plant. But, potential for increasing the COP has been detected by optimizing the control strategy. Finally, the ThermoPump offers the possibility to use beat for its operation, as e.g. CO2-free energy from solar collectors or waste beat, instead of electricity, which can be of interest from an economic and ecologic point of view.

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Pages: 11 p.

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Details

  • Original title: Experimental analysis of a small-capacity ammonia/water absorption heat pump using a novel concept of a "thermally driven" solution pump.
  • Record ID : 30013681
  • Languages: English
  • Source: International sorption heat pump conference (ISHPC2014), College Park, United States, March 31-April 2, 2014.
  • Publication date: 2014/03/02

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