[TRNSYS-users] warm up/cool down heater curve

[David BRADLEY]

Juan Francisco,
  Are you trying to model an electric heater that has a significant 
thermal mass? Or is this a situation in which you have to limit the 
power to the electric heater as it warms up and cools down? I think if 
you are trying to model the first case, you can use Type963 from the 
TESS HVAC Library. The model is of a simple lumped capacitance so it 
would model the mass of your heater. It also has a heat gain input to it 
for the actual output of the electric coil.  In the second case 
(limiting the power to the heater during warmup/cooldown) you might 
start with Type980 in the TESS Controllers Library. This Type computes 
the elapsed time since the last time a control signal changed states.
Best,
  David


On 4/20/2012 05:49, JUAN FRANCISCO BELMONTE TOLEDO wrote:
> Hello all.
> i need to model the exponential power curve warm up/cool down of an 
> electric heater.
> In this way i would need to create a kind of reset time (time=0) in a 
> particular moment of time (when a schedule [forcing funtion] says) to 
> initiate the warm up/cool down steps.
> My question is if this can be done just by means of an equation type?, 
> as i see variable TIME is in hours and always from the beginning of 
> simulation.....
> Thanks and Regards.
> /Juan Francisco Belmonte Toledo/
> /Universidad de Castilla-La Mancha/
> /Campus Universitario. Avda. de España, s/n/
> /02071 Albacete. Spain /
>
>
>
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> 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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