[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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