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<DIV><FONT face=Arial size=2> I was wondering if anybody has
encountered a similar problem - and how it was solved</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2> 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.</FONT></DIV>
<DIV><FONT face=Arial size=2> What should one do</FONT></DIV>
<DIV><FONT face=Arial size=2>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) ?</FONT></DIV>
<DIV><FONT face=Arial size=2>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 ?</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2> 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.</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>
Thanks
S. Hassid</FONT></DIV><PRE>
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