[TRNSYS-users] Lighting Load contrbutions to Zone Level

[David BRADLEY]

Saleh,
   If you have defined your lighting gains in an equation and are 
passing them into Type56 through an input, you can break the lighting 
gain up however you want and add 60% of it to the zone and the other 40% 
to the return air stream using either Type693 if you have the TESS Loads 
and Structures library or using some equations and a call to Type33 
(psychrometrics) to get the correct RH.
best,
  David


On 5/16/2011 17:11, saleh saadi wrote:
>
> Dear TRNSYS User,
>
> I'm modeling a 3 floors office building in TRNSYS 16 and comparing the 
> results to those of EnergyPlus(E+). Using Energy Rate method in 
> TRNSYS, I estimated the peak cooling and heating load which found to 
> be the same as those from E+. I accordingly used them to size my HVAC 
> system (package unit to supply air at 12.8 deg C) and then provide VAV 
> and reheat for tune up at the zone level. Since no VAV component is 
> available in TRNSYS 16 (unless I buy it!), I had to make one simple 
> model myself using equations to vary the mass flow rate for each zone 
> based on the zone load and thermostat response.
>
> The problem:
>
> My VAV damper modulating mechanism is based on the response received 
> from the zone. This response is dependent on the internal load for the 
> Core zone for example (or zone load for perimeter areas). In E+, 
> lighting load contributed to the zone is only 60% and 40% of that will 
> go through the return air without contributing directly to the zone. 
> However, the TRNSYS Model sees the entire lighting load at the zone 
> level and therefore the zone load is higher than those seen in E+ 
> which makes the mass flow rate higher.as well Since my VAV response is 
> based on the zone load rather than the system load, is there a way to 
> have this division in TRNSYS where I could match the zone loads. I 
> would like to mention that both models give a reasonable match at 
> system level which is good for energy estimation. I'm interested at 
> zone level at this moment of time but still needs a reasonable results 
> for energy consumption. Therefor, total lighting load is needed for 
> energy calculation but some sort of reducing it at zone level  is sought.
>
> Thanks,
>
> Saleh NJ AL-Saadi
>
> University of Colorado at Boulder
>
> Department of Civil, Environmental and Architectural Engineering
>
>
> _______________________________________________
> TRNSYS-users mailing list
> TRNSYS-users at cae.wisc.edu
> https://mailman.cae.wisc.edu/listinfo/trnsys-users

-- 
***************************
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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