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Minimizing TEWI in a compact chiller for unitary applications.

Author(s) : BARNES P. R., BULLARD C. W.

Summary

A simulation model was developed to investigate strategies for reducing total equivalent warming impact (TEWI) in compact water chillers. The focus was on minimizing refrigerant charge while increasing efficiency, using R410A as an example. Compact flat plate heat exchangers with refrigerant channels similar in scale to microchannels appear capable of reducing total system charge by about 80% compared to conventional air-air split systems. Results are also compared to those obtained for highly efficient air-to-air unitary systems, in which minimum-TEWI design strategies require larger heat exchangers having greater charge. Overall, the two approaches achieve comparable reductions in global warming impacts; the chiller depends more on reducing direct emissions, compared to unitary systems' dependence on reducing indirect emissions through use of flat multiport tubes with folded fins.

Details

  • Original title: Minimizing TEWI in a compact chiller for unitary applications.
  • Record ID : 2006-0929
  • Languages: English
  • Subject: Environment, General information
  • Source: ASHRAE Transactions. 2004 Annual Meeting, Nashville, Tennessee, USA. Volume 110, part 2 + CD-ROM.
  • Publication date: 2004

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