I am undergraduate student and have just started learning how to model HVAC systems using the open modelica connection editor. I have learnt through the building library examples and came across the tutorial on space cooling. I tried editing the existing model to apply my own parameters to try and find the efficiency of the heat transfer between the air and water mediums.
The code is edited based on the example from :https://simulationresearch.lbl.gov/modelica/releases/v9.0.0/help/Buildings_Examples_Tutorial_SpaceCooling.html#Buildings.Examples.Tutorial.SpaceCooling.System3
After simulating of the model, I still get Q1_flow = Q2_flow despite trying to vary the mass flow rates of air and water to vary Q1 and Q2. I wanted the values of Q1 and Q2 to be different so that I could get the ratio to find efficiency of the cooling coil component. I suspect that the heat exchanger component of the model
(Buildings.Fluid.HeatExchangers.WetCoilEffectivenessNTU) uses the Q nominal value set in the cooling coil component which ignores the calculation of the the Q flow from water and instead takes the Q flow of air.
Am I missing any key parameters or is the example model itself not suitable for my application? Are the parameters I set correct for the simulation or should I use other cooling coil components to model the efficiency? Any advise on how to model a AHU to find efficiency of heat flow between air and water in the cooling coil by varying the flow rates?
Attached is my .mo file of the edited example with the above code and simulations.
Any help is appreciated, thanks!
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