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Evaluation of the performance potential of CO2 as a refrigerant in air-to-air air conditioners and heat pumps: system modelling and analysis. Final report.

Author(s) : ORTIZ T. M., LI D., GROLL E. A.

Type of monograph: Report

Summary

This study presents the development, validation and application of a new model for simulating the performance of unitary air-to-air CO2 air conditioners and heat pumps. A validation of the model has been accomplished using recent experimental data for a gas cooler and evaporator, each tested as stand-alone components, as well as CO2 system data. Heat exchanger capacities were predicted within the bounds of experimental error. The compressor power consumption and system COP were predicted within 5% of the experimental values. The airside pressure drop was predicted within 30% of the experimental values and the refrigerant-side pressure drop was overpredicted by a factor of 1.0 to 2.5. Using alternate friction factor correlations, checking density calculation and removing minor loss coefficients failed to isolate the source of the CO2 pressure drop prediction error. Case studies simulating a carbon dioxide heat pump system in both cooling and heating modes are conducted. Extract from the table of contents: review of relevant empirical correlations; description of the model (compression, gas cooler, expansion and evaporation processes; liquid-to-suction line heat exchanger; numerical methods used in the model; overall system convergence; summary of new model features); model validation; feasibility of using CO2 in residential air conditioners; conclusions and recommendations. The report can be downloaded from the Web site: www.arti-21cr.org/research/completed/index.html.

Details

  • Original title: Evaluation of the performance potential of CO2 as a refrigerant in air-to-air air conditioners and heat pumps: system modelling and analysis. Final report.
  • Record ID : 2004-3065
  • Languages: English
  • Publication: US Department of Commerce, NTIS (National Technical Information Service) - United states/United states
  • Publication date: 2003/12
  • Source: Source: ARTI-21CR-610-10030; 205 p. (21 x 29.7); fig.; tabl.; ref.; 2 append.

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