Screening criteria for ILs used in NH3 based absorption heat pump systems

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Abstract

This paper describes a properties-optimization work for the working fluids in NH3 / ionic liquid (ILs) based single-effect absorption heat pumps. The optimum parameters of the IL can be used as criteria in screening task-specified ILs, which play the role of absorbents, in absorption heat pumps. First, a 8-parameter thermodynamic model to calculate performances of a single-effect absorption heat pump cycle was proposed, which is based on the non-random two-liquid (NRTL) activity coefficient model for the vapor pressure and a linear function for the heat capacity. Then, experimental data on the vapor-liquid equilibrium (VLE) of solutions and heat capacities of the pure ILs were reviewed and fitted to obtain ranges of those parameters. Within certain limits, the values of parameters were optimized in the following step using the above proposed mode. The objective is a maximum system performance. The optimized ILs have low molecular weights, low specific heats and have high absorption capabilities.
Original languageEnglish
Title of host publicationProceedings of the 16th International Refrigeration and Air Conditioning Conference at Purdue
Subtitle of host publicationIRACC 2016
EditorsEckhard Groll
Place of PublicationWest Lafayette, IN, USA
PublisherPurdue University
Number of pages9
ISBN (Print)978-1-5108-2873-5
Publication statusPublished - 2016
Event16th International Refrigeration and Air Conditioning Conference at Purdue - West Lafayette, IN, United States
Duration: 11 Jul 201614 Jul 2016
Conference number: 16

Publication series

NamePurdue e-Pubs
PublisherPurdue University Libraries

Conference

Conference16th International Refrigeration and Air Conditioning Conference at Purdue
Abbreviated titleIRACC 2016
CountryUnited States
CityWest Lafayette, IN
Period11/07/1614/07/16

Keywords

  • absorption cycle
  • heat pump
  • ILs
  • NH3

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