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Application of optimization study of compressors used in air conditioning systems.

Number: pap. 2563

Author(s) : ARALIKATTI J. V., ZIETLOW D. C.

Summary

Total life-cycle cost of a system refers to the costs incurred by the owner over the entire life of the system. The two main components of this are: 1) initial cost: cost to purchase the system, often defined by the total/maximum capacity and quality of the system, and 2) operating cost: the cost of operation over the entire life of the system, defined by the daily usage and the efficiencies of the system and its components. Most compressors are designed with a focus on minimizing the initial cost. Minimal data are available on the selection of a compressor based on its design variables and the corresponding cost impact. A comprehensive link between the design requirements and their initial and operating cost implications is lacking in the industry. This project addresses this issue by analyzing the impact of design variables on the total life cycle cost of an automobile air conditioning (AC) unit when located in different climatic zones. Using an earlier, experimentally validated, analytical model, the isentropic efficiency and volumetric efficiency of a reciprocating compressor are varied to suit the environmental conditions of four climatically diverse cities (with respect to the temperature, average length of cooling season and humidity) i.e. Phoenix, AZ, Peoria, IL, Minneapolis, MN and Miami, FL. The model connects the efficiencies to primary design variables of a compressor, namely the polytrophic exponent, clearance ratio, geometry, etc. The lowest possible life-cycle cost and the corresponding compressor specifications are determined and reported. Using this in the design of AC units (residential/commercial, automobile) will result in the best compressor design for a given application. For colder climates (Peoria and Minneapolis) the optimum isentropic efficiency and volumetric efficiency of a compressor averaged over the cooling season at 51% and 69% respectively, whereas for hotter climates (Phoenix and Miami) the efficiencies averaged at 60% and 73% respectively.

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Pages: 10

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Details

  • Original title: Application of optimization study of compressors used in air conditioning systems.
  • Record ID : 30024647
  • Languages: English
  • Source: 2018 Purdue Conferences. 17th International Refrigeration and Air-Conditioning Conference at Purdue.
  • Publication date: 2018/07/09

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