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A 20-ton vapor compression refrigeration system is to evaporate R-12 at -20°C and to
condense it at 40°C. The vertical compressor is to run at 10000 rpm; it is single acting, has the bore equal
to the stroke, and has 5% clearance. Vapor enters the compressor at -10°C and liquid enters the expansion
valve at 30°C.
Draw the schematic and ts diagram
1.1 What refrigeration flow rate is required?
1.2 What would be the bore and stroke of the compressor?
1.3 What power is required by the compressor?
1.4 What is the quantity of the cooling water required in the condenser for a 8-degree
increase in temperature?
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