[TRNSYS-users] Simulation of building heating/cooling system starting from profile load

[David BRADLEY]

Jacopo,

  You are on the right track with Type690 and a heat pump. The 
assumption when generating heating and cooling loads is that the zone 
temperature is controlled. The idea of Type690 is to impose those loads 
on a lumped capacitance to turn them back into temperatures so that you 
can implement a thermostat that controls a heat pump whose energy 
addition/removal is also imposed on the lump to try and keep it at a 
controlled temperature. The key is to tune the lump so that it reacts to 
the load and the input from the heat pump in the same way that the 
original zone does.

  Another valid approach would be to use Type682. The idea here is that 
you impose the heating and cooling loads on a liquid stream. As an 
aside, there is also Type693 if you want to impose the loads on an air 
stream. The Type682 solution is ideal if you are modeling a central 
plant and if your loads include the energy consumption of the terminal 
delivery devices. If your heat pumps are zonal then things get a little 
more tricky and you're not going to use the heat pumps to directly 
impact the liquid stream. Instead you're going to give the heat pump the 
entering water temperature and the control mode (heating or cooling). 
You're going to use the heat pump's outputs for compressor energy to 
modify your zone loads. It sounds more complicated than it is and if you 
are using v18 I can make you an example of how it might work.

kind regards,

  David




On 05/09/2022 04:44, Jacopo Valente via TRNSYS-users wrote:
>
> Dear TRNSYS users,
>
> I am trying to simulate a system for the conditioning of a building, 
> in particular first an air-to-air heat pump system and then a 
> water-to-water heat pump system. In my case I haven’t the building 
> modeling like using type56, but I have the required loads in both 
> heating and cooling mode. I have the tess library and I tried to 
> connect the heat pump to the type690, but I'm not sure it's the 
> correct choice. Which is the type most suitable for reading the loads 
> and controlling the zone temperature?
>
>
> Best regards,
> Jacopo
>
>
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-- 
***************************
David BRADLEY
Principal
Thermal Energy System Specialists, LLC
3 North Pinckney Street - suite 202
Madison, WI  53703 USA

P:+1.608.274.2577
d.bradley at tess-inc.com

http://www.tess-inc.com
http://www.trnsys.com
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