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Why use glycols in HVAC systems?

Author(s) : EPPELHEIMER D. M.

Summary

Glycols are used to prevent damage to heating, ventilating, and air-conditioning (HVAC) equipment due to freezing and corrosion. Two glycols enjoy wide acceptance, ethylene glycol and propylene glycol. Both glycols have lower heat transfer characteristics and increased pumping requirements when compared to water. The loss of heat transfer and the increase in pumping power are influenced by temperature and the concentration of the fluid. The effects of glycol can be mitigated by careful selection of equipment. The paper illustrates methods by which to reduce the impact of glycols when selecting cooling coils and chillers. Techniques such as increasing log mean temperature difference and modifications in coil circuiting or tube geometry can have a dramatic effect. The benefits of these techniques will be reviewed.

Details

  • Original title: Why use glycols in HVAC systems?
  • Record ID : 1999-0466
  • Languages: English
  • Source: ASHRAE Transactions.1997 Annual Meeting, Boston, MA.
  • Publication date: 1997
  • Document available for consultation in the library of the IIR headquarters only.

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