Question-and-Answer Resource for the Building Energy Modeling Community
 | 1 | initial version |
If you're looking for those specific outputs (air temperature inside the walk-in freezer and temperature of stored product within the walk-in freezer), then it doesn't look like EnergyPlus calculates this. For any object type, you can review their list of possible output variables that can be plotted on a time-series bases in the Input Output Reference. The Refrigeration:WalkIn object type's list of output variables does not include either of these variables that you're looking for.
For some further research, the Engineering Reference documentation is a good place to review calculations, assumptions, and other details for various simulation processes used by EnergyPlus. For the walk-in refrigeration, it doesn't explicitly state it, but it seems that EnergyPlus assumes that the air inside the walk-in freezer is at a constant temperature (the rated operating temperature input). The Engineering Reference section doesn't mention product within the walk-in freezer, but there is a restocking schedule input that sets a Watt of refrigeration load imposed on the system caused by stocking the walk-in with product warmer than the operating temperature. So again, it seems that EnergyPlus assumes that the product temperature is constant (likely also the operating temperature input).
The Engineering Reference does say that the walk-in freezer model is based on the ASHRAE load model, and provides the following reference:
