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Microchannel heat exchangers for charge minimization in air-cooled ammonia condensers and chillers.

Author(s) : HRNJAK P., LITCH A. D.

Type of article: Article, IJR article

Summary

This paper presents experimental results from a prototype ammonia chiller with an air-cooled condenser and a plate evaporator. The main objectives were charge reduction and compactness of the system. The charge is reduced to 20 g/kW (2.5 oz/Ton). This is lower than any currently available air-cooled ammonia chiller on the market. The major contribution comes from use of microchannel aluminium tubes. Two aluminium condensers were evaluated in the chiller: one with a parallel tube arrangement between headers and ''microchannel'' tubes (hydraulic diameter = 0.7 mm), and the other with a single serpentine ''macrochannel'' tube (hydraulic diameter = 4.06 mm). The performances of the chiller and condensers are compared based on various criteria to other available ammonia chillers. This prototype was made and examined in the Air Conditioning and Refrigeration Center in 1998, at the University of Illinois at Urbana-Champaign.

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Pages: 658-668

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Details

  • Original title: Microchannel heat exchangers for charge minimization in air-cooled ammonia condensers and chillers.
  • Record ID : 2008-1525
  • Languages: English
  • Source: International Journal of Refrigeration - Revue Internationale du Froid - vol. 31 - n. 4
  • Publication date: 2008/06

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