Since the instantaneous values of the compressor power requirement, pressure and temperature values at various locations of the circuit, and mass flow rate are highly fluctuating during the operation of VFD compressor-based heat pump system, what may be the better method to perform the energy and exergy analysis. Analysis based on the average values is giving some unbecoming results.
A study on a laboratory model or theoretical pedal can be carried out, then the effect of compressor speed (i.e. refrigerant mass flow rate and the refrigerant pressure ratio) on the exergy efficiency can be investigated.
You can refer to this journal. Please see
Saidur et al., 2012 Applications of variable speed drive (VSD) in electrical motors energy savings Renewable and Sustainable Energy Reviews 16 (2012) 543–550
TQ
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