[TRNSYS-users] Modelling cold room in TRNSYS

[David BRADLEY]

Hassan,

   You are definitely on the right path in using Type56.

1. PCM

this is perhaps the trickiest one to answer because it depends on how 
precisely you want to model this aspect of the system. I am not aware of 
a model of parallel tubes that are encapsulated in PCM sleeves or in a 
PCM layer. However, there are three PCM models available that you might 
look into to determine whether they are a reasonable approximation.

The first is a PCM model that is offered for free on user contributed 
Type library called TRNLib 
(https://sel.me.wisc.edu/trnsys/trnlib/library16.htm#thermalstorage). If 
you are using Trnsys18 then you'll need to recompile the code into a 
64-bit dll. Fortunately you can use the TypeStudio to do so. I believe 
that this model assumes the PCM to be a layer on the surface of one of 
the building walls (or ceilings or floors).

The second is a simple PCM model that is available for purchase 
(http://www.trnsys.com/tess-libraries/individual-components.php.html). 
The model assumes the PCM layer to be embedded in a building surface.

The third is a PCM model written by Transsolar 
(https://www.trnsys.de/docs/komponenten/komponenten_ts_en.htm). I am 
afraid I know the least about this model

2. Refrigeration monoblock system

I would look at using a component from the TESS HVAC library for this 
(probably the split system air conditioner). It is a performance map 
component so if you can get some information from the manufacturer of a 
monoblock system, you can probably adapt that to the Type's performance 
map data file format.

3. Food (vegetables and fruits), product load and respiration

Type963 in the TESS Loads and Structures library might be a good 
starting point. It models a lumped thermal capacitance that we have used 
as a generic frozen or cold product in the past. The model does not 
account for moisture however, so if moisture loss from the product is a 
factor in your analysis then the model might need to be expanded. If you 
are aware of algorithms that are commonly used to model both product 
load and respiration, I'd be interested in knowing about them as we are 
always looking for ways to expand the libraries.

4. PV solar panel, charge controller, battery, inverter.

  The standard TRNSYS library should have the components that you need 
for this aspect of the system. Have a look in the Electrical folder.

kind regards,

  David


On 06/17/2020 08:12, Hassan Mroue via TRNSYS-users wrote:
>
> Dear all,
>
> I started to model a PV solar-powered refrigeration system used for 
> food transportation. The cold room is also integrated with PCM 
> encapsulated tubes installed to the ceiling.
>
> For now, I constructed the cold room using TRNBuild TYPE 56.
>
> Which TRNSYS TYPE corresponds to the followings:
>
>  1. PCM
>  2. Refrigeration monoblock system
>  3. Food (vegetables and fruits), product load and respiration
>  4. PV solar panel, charge controller, battery, inverter.
>
> Any help will be much appreciated.
>
> Many thanks,
>
> Hassan
>
>
> _______________________________________________
> 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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