How to plot coefficient of performance(COP) of refrigerat​ioncyclemo​delexample​?

I have downloaded the model and there is no scope of plotting graph of COP Vs time, i want to add COP block in simulink model.

I am facing the problem that how to calculate COP of refrigeration cycle used in air conditioner?

I have attached the model, on which I am working.

If someone knows how to calculate, Please help!!

Answer 1

[Yifeng Tang]

For an air conditioning system, the COP is defined as the ratio between the cooling power and the compressor work. There are two ways I can think of to find out these two quantities.

1. Use flow sensors to measure the energy flow in and out of the evaporator, take the difference, and you'll get the cooling power. Measure the torque of the compressor using a torque sensor, multiply the output by the angular velocity, and you'll get the compressor power. Check out this EV thermal management example, and see how the sensors are used to measure the heat flow at the heat exchangers.
2. You can use the "Probe" block to extract information from the evaporator and the compressor. This will give you Simulink signals directly from the calculated Simscape variables. In newer versions (R2024b and later I think?), you may use Property Inspectors to change the units of the signals (see here). Otherwise, the units are "default" as specified in the Simscape code behind the blocks.

Then take the ratio and you'll get the COP.

You may need to put a saturation block or a transfer function after the calculation because sometimes the transients can give you unreasonable values, like inf or negative COP.

Hope this helps.

[琦]

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