[BLDG-SIM] Wet Bulb Temperature

[Samuel Hassid]

   I was wondering if anybody has encountered a similar problem - and how it was solved

  In Israel the metorological years contain both the Wet Bulb Temperature and the the relatrive humidity. These, however, are not consistent with the ASHRAE algorithm - which is used in most simulation programs. The Meteorological service stands behind its algorithm for calculating the Relative Humidity from the Wet and Dry Bulb temperatures, on the grounds that the wet bulb temperature recorded is under natural ventilation, and therefore the incresed value of the hygrometric constant is relevant.
   What should one do
a. Calculate from the Relative Humidity Readings a new wet bulb temperature, consistent with teh ASHRAE algorithm (or with the high velocity wet bulb temperature algorithm) ?
b.  Not bother - on teh grounds that anyway the wet bulb temperature inside buildings is usually based on relative low velocity - as in the measured wet bulb temperature ?

  A quick check shows that the difference may be of the order of several percentage points for the relative humidity, or of the order of 1 oC for Wet Bulb Temperature.

  Thanks                 S.  Hassid

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