[TRNSYS-users] modeling GSHP for DHW using TRNSYS

[David BRADLEY]

Vitor,

    Everything that the heat pump model needs is input either in an 
external data file or as a parameter to the model. The example/default 
data file is from an actual heat pump so the very simplest thing to do 
is to change the capacity and power consumption parameters in the 
Type927 proforma and leave the default data file alone. If you have a 
specific heat pump (manufacturer, model#, etc.) that you want to use 
then you'll need to go to the manufacturer's website and get the heat 
pump's performance data. These will be tables that give the heat pump's 
capacity and COP as a function of entering water temperature, air flow 
rate, etc. You will need to take the manufacturer's data tables and put 
them into the format that Type927 requires. You will also need to 
"normalize" the data. That means that once you put it in the Type927 
format you will divide each capacity value by the heat pump capacity at 
rated inlet conditions and each power consumption value by the power 
consumption at the rated inlet conditions. Essentially the Type927 data 
file contains a set of multipliers on the rated capacity and power 
consumption (which are taken as parameters in the Type927 proforma) and 
which allow the model to account for how the heat pump performs when the 
inlet conditions are not at the rated condition.

kind regards,

  David



On 07/07/2019 10:28, Vitor Leite via TRNSYS-users wrote:
> Hello everyone,
>
> I have TRNSYS18 and as I am getting closer to complete my first model 
> utilizing the program, I have a few questions that could not be 
> answered utilizing search engines on the internet.
>
> The model is basically a GSHP utilizing type 927 (water-water HP), 
> type 534-NoHX (storage tank) and type 557a (GHEX) + pumps, etc ,etc...
>
> My questions are:
>
> 1- How can I create the Heat Pump performance data? I already read 
> both Tess and TRNSYS documentation files but they do not explain 
> properly what are the steps necessary to create the performance data 
> file. If what I understand is correct, I just need to change the 
> source and load entering temperatures at the file and the maximum 
> rated capacity and power INSIDE trnsys? or all those must be changed 
> within the data file? I can't find the rated capacity and power inside 
> the data file.
>
> 2- I received the file for DHW demand in kWh. What is the best way to 
> evaluate my system and match its size accordingly?
>
> Thank you everyone,
>
> Vitor
>
>
>
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-- 
***************************
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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