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Conference Proceeding by ASHRAE, 2016
Syed Zahid Hussain Rizvi, PhD, CEng, Member ASHRAE
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This paper investigates the performance of liquid overfeedand direct-expansion (DX) refrigeration systems and includescomponent performance and system balance. This projectincludes the design of two refrigeration circuits, liquid overfeedflooded and DX with a common condenser, and analyzes theperformance of the heat exchangers and their impact on the overallcircuits performance. Several design techniques and methodsare considered, including geometry and construction of heatexchangers. The performance of the two circuits is compared forfour operating temperatures; 20C (4F), 10C (14F), 0C(32F), and 5C (4F); and analyzed to ascertain circuit operation.DX evaporators are often utilized operating at10C(14F)and below for relatively small duty systems, below 25kW(7.1 TR).However, liquid overfeed flooded evaporators are rarely seenpractically for systems in this range. The performance of the DXandliquid overfeed floodedevaporatorsis alsoanalyzedfor smallduties at the four operating conditions.
Citation: 2016 Winter Conference, Orlando, FL, Transactions 2016, Vol 122 pt. 1