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Isentropic-isothermal efficiency for optimized compressor rating.

Number: 1233

Author(s) : LANGEBACH R., BRADSHAW C., SCHMITT J., KHAN A.

Summary

Millions of compressors are used in refrigeration, air conditioning and heat pump systems. Their energy consumption is the most significant contributor to the efficiency of an entire HVAC system. The component specific isentropic efficiency is used for the energetic evaluation of compressors in accordance with globally standardized test procedures. The isentropic efficiency represents a relationship between the total power input and the friction-free, adiabatic power needed when compressing a refrigerant at a defined operating point. However, this basis of comparison neglects to account for a scenario where significant compressor heat transfer is achieved, so a new basis of comparison is proposed. For a Carnot cycle, the compressor outlet point is on the dew line, so that isobaric condensation can take place in the condenser. Depending on the fluid properties of the refrigerant used, a significant proportion of the ideal compression (isothermal proportion) may lie outside the liquid-vapor region. However, it would be advantageous to take this proportion into account in the energy efficiency to emphasize the refrigerant-specific influences of compression on the cycle and the system more clearly. Presented in this work, a new proposal for the isentropic-isothermal efficiency is to be introduced and compared with typical efficiencies discussed in the literature for the energetic evaluation of compressors. The main result is that the use of isentropic-isothermal efficiency can provide a better insight into the evaluation of the compressor. The user can directly see how well the compressor works with the refrigerant used at the operating point.

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Pages: 7

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  • Original title: Isentropic-isothermal efficiency for optimized compressor rating.
  • Record ID : 30033588
  • Languages: English
  • Subject: Technology
  • Source: 2024 Purdue Conferences. 27th International Compressor Engineering Conference at Purdue.
  • Publication date: 2024/07/18

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