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Thermal Comfort

ANSI/ASHRAE Std. 55-1992 (Addendum 55a-1995): 

“Thermal Environmental Conditions for Human Occupancy”

Must include consideration of:

  • Sensible (dry bulb) temperature

    • generally speaking 68-75°F in winter, 73-79°F in summer

  • Relative humidity (RH)

    • optimum range typically considered 30-60%

  • Radiant heat transfer

    • large areas of glass; works both directions

  • Air speed

    • nassumes £ 50 fpm

Must also consider:

  • Clothing level

    • garment insulation values, “clo”; range is 0.4 – 1.7

  • Activity level

    • estimated in metabolic units, “met”

    • assumes occupants are primarily sedentary (£ 1.2 met)

 

 

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