[TRNSYS-users] Problems with windows... (probably an easy one for people used to TRNSYS)
Nicolas Heijmans
nicolas.heijmans at bbri.be
Thu Jan 29 01:36:53 PST 2009
Hello,
I'm a new user of TRNSYS and I have a problem with the windows.
I have a small room with only one window (and some necessary walls to satisfy TRNSYS requirements).
I have selected a window from the database, with U = 1.1 W/m².K and g = 0.609. The surface is 10 m². The window is horizontal.
A solar gains, I have 36 kJ/h.m², 100% diffuse. The temperature is the same on both sides (0°C).
I do expect that :
- solar gains = 36*10 = 360 kJ/h.
- solar gains that enters the room = 360*0.609 = 219 kJ/h.
- heat losses = 1.1*10*3.600 = 39.6 kJ/h.K
--> expected increase of temperature = 219/39.6 = 5.5 K.
However:
- the calculated increase of temperature is only 2 K,
- Qsoltr is only equal to 160 kJ/h, where I expected 219 kJ/h.
The same exercise with a glazing of type NoGlass (U = 5.68 W/m².K, g = 1) leads to an T° increase of 0 K where I would have expected:
360 / (5.68*10*3.600) = 1.78 K.
Could you please tell me what's wrong?
(The model is attached, all files should be placed on C:)
Kind regards,
Nicolas Heijmans, Belgium
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