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Selecting the supply air conditions for a dedicated outdoor air system working in parallel with distributed sensible cooling terminal equipment.

Author(s) : SHANK K. M., MUMMA S. A.

Summary

The central thrust of the paper is to place into question the current practice of supplying air from dedicated outdoor air systems at or near room temperature (a neutral temperature) and to develop a methodology for selecting the supply air conditions in an energy- and cost-effective manner. Hypotheses are advanced concerning the supply air dry-bulb temperature, dew-point temperature, and terminal reheat. The three hypotheses are then tested and found to be correct. In general, it is recommended that the supply air temperature from the dedicated outdoor air system be no higher than 13 °C. The recommended supply air dew-point temperature is whatever it takes to provide all of the latent cooling while maintaining the space relative humidity at no more than 40%, or a supply air dew-point temperature of approximately 7 °C. Experimental data are given, in terms of supply air dry bulb temperature, dew-point temperature and terminal reheat temperature.

Details

  • Original title: Selecting the supply air conditions for a dedicated outdoor air system working in parallel with distributed sensible cooling terminal equipment.
  • Record ID : 2002-1512
  • Languages: English
  • Source: ASHRAE Transactions. 2001 Winter Meeting, Atlanta, GA. Volume 107, part 1 + CD-ROM.
  • Publication date: 2001
  • Document available for consultation in the library of the IIR headquarters only.

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