Hello Didier,
I had similar problem when I used that method. I later decided to use average monthly soil surface temperature from NASA Surface Meteorology and Solar Energy website, link below. I use type 54 weather generator to generate the hourly values for one year from the monthly averages, I compared the values of generated soil surface temperature with the ambient temperature for the same location, the soil surface temperature is higher than the ambient temperature in summer and lower than ambient temperature in winter, which means that solar radiation have been accounted for in generating the monthly soil surface temperature average.
Values of monthly average soil surface temperature is available for 1º X 1º of longitude and latitude for any location in the world.
http://eosweb.larc.nasa.gov/sse/RETScreen/
Abdullahi
Abdullahi Ahmed (BSc. MSc.) Postgraduate researcher School of the Environment University of Brighton Cockcroft Building Lewes Rd. Brighton BN2 4GJ
Tel: +44 01273 643455
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Message-----
Dear TRNSYS users,
I'm using the hypocaust
type460. Although it seems that this gives me to high output temperatures.
Does somebody know if in
this type the effect of blue-sky-radiation is implement. In other words, does
the ground radiates its heat at night to the sky?
Thanks in advance, Didier |