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Model-Based Performance Comparison of Ammonia Chemisorption Heat Pumps for Cold Climate with Different Working Pairs and Cycle Configurations.

Number: pap. 2663

Author(s) : YANG Z., QU M., GLUESENKAMP K.

Summary

Space heating is a major contributor to building energy consumption especially in cold climates. Conventional gas-fired furnaces are approaching thermodynamic efficiency limits, while electric heat pumps performance declines drastically at low ambient temperature. Chemisorption heat pump (CSHP) systems could be a better solution to space heating for cold climate due to their sustained capacity and efficiency at large temperature lifts. The performance of CSHP primarily depends on the working pair and cycle configuration. Most existing comparative studies of chemisorption systems in the published literature focus on refrigeration, but not many in heating applications. The few existing studies of chemisorption heat pump for heating involved too limited cycles and working pairs to represent the most promising performance of the CSHP. The goal of this study is to fill the gap through extensive performance comparison of CSHP using various salts and cycle configurations to discover the potential in space heating of the CSHP technology. Thermodynamic models of six cycle-configurations were first developed and applied to evaluate system performances across the 65 working pairs operated at cold climate heat pumping conditions. The system performances were predicted and compared under different ambient temperatures and assumed system design parameters such as thermal masses. The comparison shows that the double-effect CSHP has the highest efficiency at ambient temperature below -20°C with cycle thermal Coefficient of Performance (COP) above 1.5 and system primary energy COP above 1.2.

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Pages: 10

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Details

  • Original title: Model-Based Performance Comparison of Ammonia Chemisorption Heat Pumps for Cold Climate with Different Working Pairs and Cycle Configurations.
  • Record ID : 30024710
  • Languages: English
  • Source: 2018 Purdue Conferences. 17th International Refrigeration and Air-Conditioning Conference at Purdue.
  • Publication date: 2018/07/09

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