[TRNSYS-users] Questions

[David BRADLEY]

The connection between the file containing loads and Type682 is usually 
done through Type9.

Your other question is a good bit harder to answer because everything 
depends on the details of the system that you are trying to model. The 
fundamental problem is probably that you have hourly loads (energy rate 
control) while the heat pump model is a temperature level control device 
that is expecting a thermostat or some other kind of controller to give 
it an on/off signal. In the real building, the heat pump would turn on 
and off as needed over the course of the hour to maintain room 
temperatures. However, the data file contains the total hourly load so 
you have to recreate, somehow, the part load performance of the heat 
pump. Here is where things depend on your system:

One solution is to define a thermal storage tank that circulates liquid 
through Type682. You can then define an aquastat that senses the tank 
temperature and turns on and off a heat pump in order to maintain the 
tank at its desired set point.

Another solution would be to define a piping loop that has a number of 
Types 682 along its length as well as some heat pumps to maintain 
temperature within a defined range.

Yet another solution is to use the heat pump as a virtual component, 
giving it the ambient and return conditions and getting back it's COP so 
that you can estimate its power consumption without modeling its on/off 
behavior.

kind regards,

  David





On 11/13/2020 02:53, celia do carmo ferrao Ferrao via TRNSYS-users wrote:
>
> Good Morning Users
>
> I'm starting models on Trnsys and I'm a little lost.
>
> I have data files with, for example, heating and cooling needs, 
> electrical, thermal loads ....
>
> The is a file. txt.. I can use Type 682 for Loads, but I don't know 
> what the correct connections are to make:
>
> 1 - Connection between the .txt file and for example Loads, Type 682 ...
>
> 2 - Connection between Type 682, or another and a heat pump.
>
> Thank you!!!
>
> Kind Regards
> C. Ferrão
>
> -- 
> Ferrão
>
> _______________________________________________
> TRNSYS-users mailing list
> TRNSYS-users at lists.onebuilding.org
> http://lists.onebuilding.org/listinfo.cgi/trnsys-users-onebuilding.org

-- 
***************************
David BRADLEY
Principal
Thermal Energy Systems Specialists, LLC
3 North Pinckney Street - suite 202
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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