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Investigation and testing of new polymeric based working pairs for absorption chillers.

Number: pap. n.77

Author(s) : EMHOFER J., SCHNEIDER M. C., FLECKL T., et al.

Summary

Absorption chillers are a potential technology for using solar energy or waste heat for cooling and air conditioning purposes. State-of-the-art working pairs require elaborate system designs and an appropriate material selection in order to deal with problems such as formation of non-condensable gases, corrosion and crystallization. The investigation of alternative working pairs is one important possibility to reduce or avoid such problems. A new approach is to use linear or hyper-branched polymers in the combination with water as working pair. A selected polymer used in this work has the capability to absorb water at suitable vapor pressure levels. Furthermore, the new working pair is expected to potentially diminish the problems of corrosion, formation of non-condensable gases, damage of the machine due to crystallization and at least relax the pricing situation. On the other hand, the high viscosity and the low heat conductivity compared to conventional working pairs are crucial for its application. To proof the feasibility of the polymeric based working pair, experiments have been carried out in a lab scale single stage absorption chiller. The lab scale chiller used falling film heat exchangers and had a cooling capacity between 60 and 100 W. We show that, under equal operating conditions, the new working pair is able to reach about a third of the cooling power compared to LiBr/water at vaporizer temperatures suitable for cooling ceilings applications. If used as a drop-in replacement, the cooling power of the new working pair does not reach the performance of LiBr. Nevertheless, the usage in adapted machines for specific applications should be discussed in future.

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Pages: 11 p.

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Details

  • Original title: Investigation and testing of new polymeric based working pairs for absorption chillers.
  • Record ID : 30014365
  • 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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