Hello forum members,
I've have used the Detailed Refrigeration Systems object to model and simulate the performance of a walk-in. Additionally, I employed the AirChiller object to model the cooling coils and named it REFRIGERATIONSYSTEM. This refrigeration system is applied to cool a specific zone, referred to as ZONE.
While analyzing the outputs, I observed two parameters: ZONE:Refrigeration Zone Air Chiller Total Cooling Rate [W] and REFRIGERATIONSYSTEM:Refrigeration Zone Air Chiller Total Cooling Rate [W]. According to the EnergyPlus InputOutputReference, there are two definitions for the Refrigeration Zone Air Chiller Total Cooling Rate:
Def1: is the total cooling (sensible plus latent) from all air chillers located in the zone in Watts.
Def2: is the total (sensible plus latent) cooling rate of the Air Chiller evaporator coil in Watts.
The first definition I think correspond to the ZONE:Refrigeration Zone Air Chiller Total Cooling Rate [W] in case of using multiple AirChillers, and the second definition is the cooling rate for each individual AirChiller. Meaning that ZONE:Refrigeration Zone Air Chiller Total Cooling Rate [W] is sum of all REFRIGERATIONSYSTEM:Refrigeration Zone Air Chiller Total Cooling Rate [W].
In my case, only one AirChiller is defined, I expect that ZONE:Refrigeration Zone Air Chiller Total Cooling Rate [W] should equal REFRIGERATIONSYSTEM:Refrigeration Zone Air Chiller Total Cooling Rate [W]. However, there appears to be a slight difference in these outputs, as shown below.
If my assumption holds true, I would appreciate insights from the community on why there might be a difference in these outputs, given that only one AirChiller is defined. Any thoughts or suggestions would be highly valued.
Here's an image for reference:
Thank you for your assistance!
