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How to calculate energy usage from the Refrigeration Cycle model in Simscape?

Asked by Ambareesh Rathi on 18 Mar 2017
Latest activity Commented on by Ambareesh Rathi on 24 Apr 2017
In the Simscape's Refrigeration Cycle model (ssc_refrigeration), I would like to determine/calculate energy usage when a cycle is simulated in Simulink.
Any leads would be appreciated. Thank you!

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1 Answer

Answer by Alisha Schor on 21 Mar 2017
 Accepted Answer

Simscape signal logging is a good place to start. This will give you access to all of the physical variables associated with each component. By probing values of the the various blocks, you can calculate the values of interest.
As a template, you can open the source code for the first embedded link in the model, "Plot performance of system." Here you can see, that compressor power, for example, can be accessed by the command:
simlog_ssc_refrigeration.Compressor.Controlled_Mass_Flow_Rate_Source_2P.power.series.values('W');
and that this is used to calculate and display the instantaneous power of the compressor. You could then integrate this value over the course of the simulation to determine the total energy input to the compressor. Following this same concept, one can also calculate the total heat energies and the expansion energy by probing the appropriate quantity.

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This was really helpful. Can you also give some inputs on how to integrate this value, by using the integrator block and not the Sum(simlog_W) command?

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