I am new to EnergyPlus and I am tinkering with the EMS object. Is there a way to control the setpoint of a refrigeration case using the EMS object? It looks like I need to add nodes to the system in order to get access to all the actuators but that is listed under HVAC in the applications manual so curious if it applies to refrigeration.
It sounds like you want to be able to reset the value of the Case Operating Temperature input field of a Refrigeration:Case object instead of that input field being a fixed setpoint value. Normally, you would use EMS to do this. However, EMS allows you to override a pre-defined list of items in the model -- not everything in the model. These items you can override are called EMS Actuators, and the only actuator related specifically to refrigeration is the Minimum Condensing Temperature of a Refrigeration:System object. Sorry, but it sounds like you are out of luck on this one.
If you feel that this should be a feature of EnergyPlus, you could make an issue on Github where the source code is managed. Perhaps adding a new input field for Case Operating Temperature Schedule could be used for those who want a dynamic way to set this parameter.
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