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

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

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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