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Modeling Cold room and Freezer room in Energy Plus?

asked 2018-04-02 02:18:53 -0600

Siva's avatar

updated 2018-04-02 10:14:37 -0600

Any one ever Modeled Cold Room and Freezer room in Energy PLus? If yes, then How Do Energy plus considers the Dynamic effects of Product Load (includes respiration Load as well)? does it have any limitation in this particular aspect? Any one Validated Modeling Cold Room and Freezer room in Enrgy Plus?

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answered 2018-04-03 11:59:27 -0600

Yes, EnergyPlus can handle Cold Rooms, Walk-Ins, and Freezers. See the Refrigeration section in the Input Output Reference. There are also example files for refrigeration included with EnergyPlus.

You can specify the product load with the Restocking Schedule field in the Refrigeration:WalkInobject. You'll need to calculate the load yourself; it doesn't autocalculate.

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@mdahlhausen Thank you very much for the reply. what about respiration heat? If I want to freeze meat , then respiration heat is a part of the load calculations. so how can I accomodate that component?

Siva's avatar Siva  ( 2018-04-05 03:23:49 -0600 )edit

I think you'll need to calculate that directly and add it to the load.

mdahlhausen's avatar mdahlhausen  ( 2018-04-05 10:24:34 -0600 )edit

@mdahlhausen.....but then, I have to assume it as a instantaneous load ..How good is that assumption?

In My view, it's a good assumption:
if it were a sensible component, then it would have been a invalid assumption as the whole sensible component cannot turn out into load but will get stored in thermal mass and then later on it will get added to the load....

As this is respiration heat, this can be taken as Latent load and for latent load there is no issue of storing and re releasing later.....and hence I can consider that as instantaneous load..So, it wont be a problem.....

Siva's avatar Siva  ( 2018-04-06 09:50:12 -0600 )edit

You don't need to assume it is instantaneous, and can't actually do that with a schedule. The load will take place over some time and equal the heat content of the product. You can do a simple calculation to estimate how fast your product will cool down, and make a curve that reflects the load getting smaller over time with the total area under the curve equal to the heat content.

mdahlhausen's avatar mdahlhausen  ( 2018-04-06 10:42:03 -0600 )edit

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Asked: 2018-04-02 02:18:53 -0600

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Last updated: Apr 03 '18