[TRNSYS-users] Qheat - calculation

[Cramer Silkworth]

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

silkworth at transsolar.com


  _____  

From: andreas thewes [mailto:andreas.thewes at uni.lu] 
Sent: Tuesday, November 11, 2008 4:43 AM
To: trnsys-users at 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
Faculté des Sciences, de la Technologie et de la Communication

Dipl-Ing. Andreas Thewes, assistant

Email: andreas.thewes at uni.lu <mailto:andreas.thewes at uni.lu> 

URL  : http://www.uni.lu <blocked::http://www.uni.lu/>  

 

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