Re: [TRNSYS-users] [type460] solar radiation versus blue-sky-radiation

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

-----Original Message-----
From: Didier De Kerpel [mailto:didierdekerpel@gmail.com]
Sent: 13 May 2008 14:20
To: trnsys-users@engr.wisc.edu
Subject: [TRNSYS-users] [type460] solar radiation versus blue-sky-radiation

Dear TRNSYS users,

I'm using the hypocaust type460.

>From professor Hollmuller I got a way to implement the effects of solar radiation on the surface.

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?
And if not is it possible in some way to implement it?

Thanks in advance,

Didier

--
Didier De Kerpel
student University Ghent
member BEST Ghent
Didier.DeKerpel@UGent.be
http://www.best.eu.org/
+32 474 27 89 79