Operation of a vapor-compression refrigeration cycle

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Reference no: EM13949851

Data for steady-state operation of a vapor-compression refrigeration cycle with propane as the working fluid are given in the table below. The states are numbered as in Fig. 10.3. The mass flow rate of refrigerant is 8.42 lb/min. Heat transfer from the compressor to its surroundings occurs at a rate of 3.5 Btu per lb of refrigerant passing through the compressor. The condenser is water-cooled, with water entering at 658F and leaving at 808F with negligible change in pressure. Sketch the T-diagram of the cycle and determine

(a) the refrigeration capacity, in tons.

(b) the compressor power, in horsepower.

(c) the mass flow rate of the condenser cooling water, in lb/min.

(d) the coefficient of performance.

drops   through   the   evaporator   or   condenser,   and  the

State

(lbf/in.2)

(8F)

h(Btu/lb)

refrigerating capacity is 1 ton. Plot refrigerant mass flow rate,

1

38.4

0

193.2

in   lb/min,   coefficient   of   performance,   and  refrigerating

2

180

120

229.8

efficiency,  versus  TC    ranging  from  408F  to  2258F  if  the

3

180

85

74.41

refrigerant is

4

38.4

0

74.41

Reference no: EM13949851

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