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Solar Heat-Gain

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Posted by Curbie on April 18, 2009, 7:07 pm
I finished TMY (Typical Meteorological Year) conversion and
normalization routines to compile the 239 reporting station's data
into summary records for each station, the idea here is to select a
location based on the closest station to use that station's summarized
data elements to drive calculations within for spread-sheet.

I also finished the porting of NREL's solar.c/h to VB for use in the
spread-sheet which along with TMY station data summaries should
provide (among other things) solar heat gain on any opaque or through
and glass construction surface. So my next step is to focus on the
application of all this in the spread-sheet.

The general calculation I have been currently using for total heating
& cooling loads is:
1° Heat-Loss Per-Day = ((Area / Thermal Resistance) * 24)) * HDD or
CDD (supplied by TMY).

So, if anyone can offer any constructive ideas, I would appreciate it.



Posted by Eeyore on April 18, 2009, 7:29 pm

Curbie wrote:

Does anyone have a clue what this is supposed to mean ?


Posted by Martin Riddle on April 18, 2009, 11:49 pm

I believe its the heat gain thru a 'surface' any where there was
supplied data.
Where a 'surface' can be glass or a solid.


Posted by daestrom on April 20, 2009, 9:57 pm

What's the matter, no Imperial units listed for you to bash?

The only term that is unit specific is Thermal Resistance must be stated in
<units of energy> / area-degree-hour.  That is so the '* 24' will convert it
to <units of energy> / area-degree-day which will then work well with HDD or

If the 'Heating Degree Days' or 'Cooling Degree Days' are in terms of
degrees Centigrade, even a SI fanatic like you could use this formula.

If your units for area and temperature difference don't match those in the
thermal-resistance term, a little unit analysis should help you figure out
the conversions.  Or have you forgotten how to do that since it's been so


Posted by Eeyore on April 21, 2009, 3:35 pm

daestrom wrote:

I still use a few of them myself for routine everyday stuff but never for

I've never heard those terms before, nor TMY.

It was the acronyms that puzzled me. How do you define a HDD or CDD or a TMY ?


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