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Andreas,
Try changing your walls, roof, and floor to a "resistance
only" construction, with a U-value equal to the mass wall construction. This
will eliminate mass storage effects, and then if your heating demands
match, then you know it's the mass.
-Cramer
J. Cramer
Silkworth Transsolar Climate
Engineering Technical consulting for energy
efficiency and environmental quality in buildings. 145 Hudson
Street Suite 402 New York, NY 10013 Office: 212-219-2255 From: andreas thewes [mailto:andreas.thewes@uni.lu] Sent: Tuesday, November 11, 2008 4:43 AM To: trnsys-users@engr.wisc.edu Subject: [TRNSYS-users] Qheat - calculation Dear all, I need your help. I have simulated with TRNSYS a small
quadratic office building. One of my Outputs in TRNSYS is the heat
demand (Qheat). Can someone explain me, how TRNSYS calculate
the heat demand (Qheat) ? If I calculate the heat demand with a
?static calculation tool? or per hand, then I have a difference of 40 percent to
the dynamic result of TRNSYS. Are only the dynamic effects (e.g. storage
capacity) the reasons? And are 40 - 60 percent realistic Thank you for your
answers. Best regards Andreas ___________________________________ Université du
Luxembourg URL :
http://www.uni.lu
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