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Local shifts of the fluid composition in a simulated heat pump using R407C.

Author(s) : YOUBI-IDRISSI M., BONJOUR J., MEUNIER F.

Type of article: Article

Summary

Because of the potential variation of the fluid composition, lots of designers are concerned by the use of zeotropic refrigerant mixtures in refrigeration and air-conditioning systems. In this paper, a local simulation model of a water-to-water heat pump is proposed by adopting a modular approach. Thus, the overall model consists of the association of an elementary model for each basic component, namely the compressor, condenser, evaporator and receiver. Implemented with a ternary zeotropic blend R134a/R125/R32, the computer simulation, based on the mass and energy conservation laws, allowed to evaluate not only the overall performances of the simulated machine, but also the circulating composition of refrigerant, the local temperature and heat transfer coefficient along heat exchangers and the local composition of refrigerant in each point of refrigerating circuit. The numerical results show that, compared to the nominal composition of R407C (R134a/R125/R32; 52/25/23%), the circulating composition in the machine is low in the less volatile component R134a (-3% absolute variation) and rich in the most volatile component R32 (+3% absolute). In the regions of condensation beginning and evaporation end, the local composition is noticeably different from both the circulating and nominal compositions. In these regions, the local mass composition of R134a increases (+4/+10% absolute) whereas the local mass composition of R125 and R32 are in deficit (-3/-6% absolute).

Details

  • Original title: Local shifts of the fluid composition in a simulated heat pump using R407C.
  • Record ID : 2006-0967
  • Languages: English
  • Source: Applied Thermal Engineering - vol. 25 - n. 17-18
  • Publication date: 2005/12

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