[TRNSYS-users] Type941 source code

[Jeff Thornton]

<I have seen that it requires to call Psychrometrics Routine, Moist
Air Properties and Air Properties. Where can I find these property
files? are they standard values and is there any reference for them?>


The psychrometrics routine can be found in the source sode/kernel
directory and the file is called psych.f90. This routine uses an
equation of state to calculate the remaining moist air properties given
the known moist air properties. For example, I could call psych with h,
T and P and get back the relative humidity and the entropy. The dry air
properties can be found in the TESS LibrariesSource Code directory.


<The component requires to call data from external file containing
'InterpolateData'. This InterpolateData gives friction capacity and
power for a range of air temperature and water temperature, however I am
wondering what will happen when the actual air temperature and/or water
temperature is out of the range (how the calculation is carried out)? Is
there any correlation used for this scenario? > 

If the values are
outside the range, the value at the end of the range is used - no
extrapolation is done. The documentation for InterpolateData can be
found in the documentation folder. 

Jeff 

---

Jeff Thornton


_President - TESS LLC_ 

_22 N. Carroll Street, Madison WI USA 53703_


_Office: (608) 274-2577 Fax: (608) 278-1475_ 

_www.tess-inc.com_


_E-Mail: thornton at tess-inc.com_ 

On 03/27/2013 12:13 pm, Zhe Li
wrote: 

> Dear All, 
> 
> Thank you for your time. 
> 
> I am trying to
follow the Type941 source code (since there is no mathematical
description available) in order to understand how exactly this
air-source-heat-pump calculates the power output. However, I have a
couple of questions in regarding with it, hope somebody could help me
with these: 
> 
> 1. I have seen that it requires to call Psychrometrics
Routine, Moist Air Properties and Air Properties. Where can I find these
property files? are they standard values and is there any reference for
them? 
> 
> 2. The component requires to call data from external file
containing 'InterpolateData'. This InterpolateData gives friction
capacity and power for a range of air temperature and water temperature,
however I am wondering what will happen when the actual air temperature
and/or water temperature is out of the range (how the calculation is
carried out)? Is there any correlation used for this scenario? 
> 
>
Thank you very much for your help. 
> 
> Zhe Li 
> Tá an teachtaireacht
seo scanta ó thaobh ábhar agus víreas ag Seirbhís Scanta Ríomhphost de
chuid Seirbhísí Faisnéise, ITBÁC agus meastar í a bheith slán.
http://www.dit.ie [1]
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