[TRNSYS-users] Anticipating consumption by loading storage tank beforehand

[David BRADLEY]

Janne,
   I think the problem you are facing would be a challenge to an actual 
system, not just to your simulation of the system. Fundamentally the 
real and simulated systems would have to know what the electricity cost 
is and this information would have to be part of the heat pump's 
sequence of controls. The simplest way to approach the time of use 
electricity rates is with a Type14 forcing function. The result of that 
forcing function would be combined with the result of a tank thermostat 
using an equation so that the heat pump heats (or cools) the tank only 
when the thermostat says to AND when the electricity is cheap enough. Of 
course there are probably times when such a control strategy will fail 
because really there isn't a way of knowing ahead of time what the load 
will be either in the simulation or in the real world.
best,
  David


On 8/21/2012 06:56, Mäkinen Janne wrote:
> Hello,
>
> I am hoping that someone could give some advices. My problem is how to control ground heat pump Type 668 so that it would not be ON when elctricity supposedly is more expensive. How could i control the heat pump so that it would load storage tank, if it is needed, before pumps schedule says they shoul be off?
>
> I have forcing function for the pumps schedule and thermostat to control storage tanks water temperature. Is it eaven possible to somehow anticipate consumption peaks and load storage tank? It seems that all my attempts to control the heat pump causes it to stay ON the whole time schedule allows it to be ON or that control does not affect anything...
>
> Thanks for any help.
>
> Janne
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David BRADLEY
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Thermal Energy Systems Specialists, LLC
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