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Influence of the high-outdoor temperature on an air conditioner operation: second-law analysis for low-GWP refrigerant fluids.

Number: 2243

Author(s) : GROUS FRANCO L. H., HENRIQUES I. B., RIBEIRO G. B.

Summary

The operation of an air conditioner under high-ambient temperatures can cause several problems, such as a reduced compressor lifespan and cooling capacity, as well as increasing energy consumption. Focusing on these aspects, this article details a thermodynamic analysis of the effect of high-ambient temperatures on two distinct vapor compression cycles: a single-stage cycle and a two-stage cycle with an economizer. In addition, the thermodynamic analysis was performed using R-407c as the working fluid, and low-GWP refrigerant fluids such as R-410a, R-32, R-1234yf, R-1234ze(E) were be compared to the baseline fluid. The heat exchangers were modeled using the zone separation method. Different ambient temperatures were simulated, ranging from 35 to 55 ºC. Moreover, a second-law analysis was performed, computing the component irreversibility for each system configuration. The impact of outdoor temperature on the internal, external, and total second law efficiencies was also part of the analysis. The proposed model was validated using experimental data available in the literature. By employing the modeling results, it is possible to identify an adequate system configuration and low-GWP refrigerant fluid suitable for extreme outdoor temperature conditions. Therefore, the negative impact caused by the high-ambient temperature is mitigated, avoiding unnecessary power input consumption and component irreversibilities.

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  • Original title: Influence of the high-outdoor temperature on an air conditioner operation: second-law analysis for low-GWP refrigerant fluids.
  • Record ID : 30030625
  • Languages: English
  • Subject: Technology
  • Source: 2022 Purdue Conferences. 19th International Refrigeration and Air-Conditioning Conference at Purdue.
  • Publication date: 2022

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