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Re: [TRNSYS-users] Comparison of TRNSYS results with HAP

Sabine,

 It is very hard to say without looking at both the HAP and TRNSYS models. If the TRNSYS model is giving you a higher heating load than HAP look at what you have assumed for the temperature of the ground in the Type56 model. In some cases by default the ground temperature (on the back side of the GROUND_FLOOR surface) is set to a constant value of 0 which gives your model a lot of (unfair) free cooling and which causes heating loads to be unrealistically high.

 Also, I believe that HAP assumes that there are no internal gains when it does it's peak heating load calculation (and may also assume that there is no solar since I think it is doing a steady state calculation). Make sure you understand what assumptions HAP is making so that you can duplicate all of them in TRNSYS.

kind regards,

 David



On 05/14/2017 06:03, sabine via TRNSYS-users wrote:

Dear all,


I am trying to compare the results of a maximum heating  load of a single zone office from TRNSYS with results from the HAP software.

I got this big difference in loads even though I entered the same U values of walls and windows, same heating temperature, and same minimum outside temperature.

Please if you can tell me why this is happening.


Regards;



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-- 
***************************
David BRADLEY
Principal
Thermal Energy Systems Specialists, LLC
22 North Carroll Street - suite 370
Madison, WI  53703 USA

P:+1.608.274.2577
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d.bradley@tess-inc.com

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