Re: [TRNSYS-users] [BLDG-SIM] workshop reminder

[David Bradley <bradley@tess-inc.com>]

Mat,

> 1. With the new version of TRNSYS16 there is also the possibility to use 
> Type56a and b (with and without standard output files). Are the standard 
> output files (bldg-monthly) similar to an energy balance (NType 901)? When 
> I look at the output file it gives monthly values for Heating, Cooling, 
> Infiltration, Ventilation, Solar_Rad, and Int_gains. However, when I add 
> them up it seems something is missing. Is the difference the conduction part?

no, they aren't. For the balances a lot of values are used which aren't 
available as "normal" NTYPEs. In addition, only the   values of the upper 
part of the "summary.bal" are integrated. The other values are simply 
printed every hour (not integrated!). The standard output files were 
developed for previous TRNSYS versions (15, specifically) and use "normal 
NTYPES" that are
integrated over the time inside 56.

> 2. There was a mistake in the types 901 - 904. Are the balance types now 
> correct? Is the documentation still correct?

the balances and the documentation were corrected for the release of 16.1.

> 3. I want to model an internal shading device that is black. Which 
> properties of shading device do I have to change? And to which values? Do 
> you know papers on that subject?

the internal shading factor available in TRNBuild has reflectance and 
thermal resistance but no absorptance. To model a black shading device, you 
should set the reflectance toward the window and toward the zone to 
something very small but non zero (0.01 should work).

Kind regards,
 David


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