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(Solved): Problem 8.1 (10 points). Apply Klein Method to model compressor operation Refrigerant R134a vapor en ...
Problem 8.1 (10 points). Apply Klein Method to model compressor operation
Refrigerant R134a vapor enters the suction header of a single-stage reciprocating compressor at
48 psia and 58\deg F. The discharge pressure is 192 psia . Pressure drop in the suction valve is 3 psi ,
and the pressure loss in the discharge valve is 4 psi . The vapor is superheated 15\deg F during the
intake stroke. The clearance volume is 7 percent of piston displacement. Determine the (a)
volumetric efficiency, in percentage, (b) the compressor pumping capacity, in l(b_(m))/(m)in, if the piston
displacement is 11in^(3) and the crankshaft rotates at 1700 rpm , and (c) shaft horsepower, in hp,
required for a mechanical efficiency of 76 percent.
If the isentropic efficiency of the compressor is 78 percent and the operating points of the
compressor during the field run time are as follows:
P_(_( s)uction )=41\psi (during field run time)
P_(d)isharge =215\psi (during field run time)
T_(-)suction =55F (during field run time)
Determine the new mass flow rate, in l(b_(m))/(m)in, and the new compressor power, in hp, at the new
field operating point (Hint: Use the Klein Method we have seen in Class).