[TRNSYS-users] Forcing Function Type 14h problem

[David BRADLEY]

Idris,
  In the case without the forcing function, there are 700W/m2 of solar 
radiation incident on the collector surface at all times. In the case 
with the forcing function there is whatever amount of solar radiation 
that the forcing function determines there to be. Please bear in mind 
that when you change the units of an input, TRNSYS /does not/ perform 
any automatic unit conversions. The Type expects to receive a value in 
the default units (kJ/h.m2 in this case). If your forcing function is 
giving a value, that value is being interpreted by Type538 as being 
given in kJ/h.m2.
kind regards,
  David


On 3/9/2015 11:04, Shofolahan, Idris Adewale wrote:
>
> Hi there,
>
>
> I'm working on solar water heating system.I wanted to test the 
> performance of the weather file before using it, by replacing it 
> with the generic forcing function type 14h to keep the beam radiation 
> on the tilted surface of component type 538 . I compared the outlet 
> temperature with andwithout the forcing functions type 14h.
>
>
>
> I plotted the ​output temperature on the online printer,but the model 
> without the forcing function gave an output temperature of 20.8 
> degrees while output temp. of the model with the forcing function was 
> 15.8 degrees. Find screenshot of the two above.  What is the reason 
> for the difference in the output temperature of the models?
>
>
> Regards
>
> Idris
>
>
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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
F:+1.608.278.1475
d.bradley at tess-inc.com

http://www.tess-inc.com
http://www.trnsys.com

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