The overall layout of the plant. The "Primary Heat Exchanger" is where the ethylene glycol stream is refrigerated with the stream "5. Primary Air In."
This stream leaves as stream "1. Primary Air Out" where it is fed into the "Regenerator," another heat exchanger model in HYSYS, then through the "Compressor," and then through a HYSYS Cooler model, named "Heat Exchanger with Cooling Water" (in the project, the cooling water is assumed to be of the exact properties required to cool the air stream to desired temperature. The stream is then fed again through the Regenerator, where it is cooled further by air exiting the Primary Heat Exchanger.
The final stage of cooling of the air stream is by running it through a turbine, which decreases the pressure and temperature and helps to power the plant, reducing the net power consumption of the plant. The stream exiting the turbine is "5. Primary Air in," used to refrigerate the ethylene glycol from the main plant.
List of assumptions regarding the HYSYS modelling of the refrigeration plant.
A detailed view of the streams of the Primary Heat Exchanger.
Summary of thermodynamic data of the Primary Heat Exchanger.
A detailed view of the streams of the Regenerator.
Summary of thermodynamic data of the Regenerator.
A detailed view of the streams of the compression cycle.
Summary of thermodynamic data of the Compressor and Heat Exchanger with Cooling Water.
A detailed view of the streams of the turbine.
A graph of net power requirement (the difference between compressor power intake and turbine power output) against pressure of air exiting the compressor and mass flow rate of air.
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HYSYS Process Model of a Refrigeration Plant
A HYSYS model of a refrigeration plant with air as the working fluid, used to . This model was used to determine the optimal conditions (specifically pressure of the air exiting the compressor and mass flow rate of the refrigerative air) required for the plant to consume as little power as possible.