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Hello, I am modelling Supermarkets in EnergyPlus by using OpenStudio. This includes the building, hot water system, interactions between HVAC and refrigeration systems, etc. I have many questions concerning refrigeration system in OpenStudio. I am using R744 in OpenStudio. However, I get a warning message in the ERR file stating that the temperature is going out of the range. I tried to change from a subcritical operation to a transcritical operation (when I click on the compressors), but I still get the same warning message concerning R744. The problem is that I don’t have access to the thermal physical properties of R744 in EnergyPlus to check the range and fix the problem. However, when I switch to another refrigerant, the error message disappears. Any idea? Many thanks in advance.

Hello, I am modelling Supermarkets in EnergyPlus by using OpenStudio. This includes the building, hot water system, interactions between HVAC and refrigeration systems, etc. I have many questions concerning refrigeration system in OpenStudio. I am using R744 in OpenStudio. However, I get a warning message in the ERR file stating that the temperature is going out of the range. I tried to change from a subcritical operation to a transcritical operation (when I click on the compressors), but I still get the same warning message concerning R744. The problem is that I don’t have access to the thermal physical properties of R744 in EnergyPlus to check the range and fix the problem. However, when I switch to another refrigerant, the error message disappears. Any idea? Many thanks in advance.