Refrigeration:AirChiller Internal Thermal gains

I'm trying to simulate a walk-in freezer, and since EnergyPlus doesn't give the internal temperature when using the Refrigeration:Walkin objects, instead I used Refrigeration:AirChiller and ZoneHVAC:RefrigerationChillerSet (Based on RefrigeratedWarehouse Example).

I want to see the effect of stored products on the power consumption of the refrigeration, so I calculated the heat loads separately and specified them as an internal gain using the OtherEquipment object.

I set Refrigeration:Electricity as the output, and found that both scenarios have the same power consumption.

Does anyone have any idea why the power consumption does not change?

Product Thermal Load OtherEquipment object

Electric Consumption(With Product)

Electric Consumption(Without Product)

Link to the models : https://drive.google.com/file/d/11roNqsZNajBB5bgliR73wgJfz8d-7Wa8/view?usp=share_link

902

Zakaria

asked 2022-11-25 12:17:46 -0500, updated 2022-11-28 12:33:35 -0500

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You need to specify the design level of the OtherEquipment object too. If you look at the .err file, you'll see this warning:

** Warning ** GetInternalHeatGains: OtherEquipment="PRODUCT", specifies Design Level, but that field is blank.  0 Other Equipment will result.

The most common way of describing a piece of equipment is setting Design Level Calculation Method as "EquipmentLevel", DesignLevel as the maximum power usage of the equipment, and providing a schedule with fractional values (with a maximum of 1).

In your case, your schedule values appear to already be in units of Watts (?), so you could specify the DesignLevel as 1.