Consider a Carnot vapor refrigeration cycle with Refrigerant 134a as the working fluid. The cycle maintains a cold region at 40 °F when the ambient temperature is 90 °F. Data at principal states in the cycle are given in the table below. The states are numbered as in Fig. 10.1. Sketch the T-s diagram for the cycle and determine the a. temperatures in the evaporator and condenser, each in °R. b. compressor and turbine work, each in Btu per lb of refrigerant flowing. c. coefficient of performance. d. coefficient of performance for a Carnot cycle operating at the reservoir temperatures. Compare the coefficients of performance determined in (c) and (d), and comment. State 1 2 3 4 p (lbf/in.²) 40 140 140 40 Warm region at Tu Com wwwww Condenser Turbine Compressor Evaporator www Cold region at Te FIG. 10.1 Carnot vapor refrigeration cycle. h (Btu/lb) 104.12 114.95 44.43 42.57 TH Te s (Btu/lb. ºR) 0.2161 0.2161 0.0902 0.0902

Consider a Carnot vapor refrigeration cycle with Refrigerant 134a as the working fluid. The cycle maintains a cold region at 40 °F when the ambient temperature is 90 °F. Data at principal states in the cycle are given in the table below. The states are numbered as in Fig. 10.1. Sketch the T-s diagram for the cycle and determine the a. temperatures in the evaporator and condenser, each in °R. b. compressor and turbine work, each in Btu per lb of refrigerant flowing. c. coefficient of performance. d. coefficient of performance for a Carnot cycle operating at the reservoir temperatures. Compare the coefficients of performance determined in (c) and (d), and comment. State 1 2 3 4 p (lbf/in.²) 40 140 140 40 Warm region at Tu Com wwwww Condenser Turbine Compressor Evaporator www Cold region at Te FIG. 10.1 Carnot vapor refrigeration cycle. h (Btu/lb) 104.12 114.95 44.43 42.57 TH Te s (Btu/lb. ºR) 0.2161 0.2161 0.0902 0.0902

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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Question

Consider a Carnot vapor refrigeration cycle with
Refrigerant 134a as the working fluid. The cycle
maintains a cold region at 40 °F when the ambient
temperature is 90 °F. Data at principal states in
the cycle are given in the table below. The states
are numbered as in Fig. 10.1. Sketch the T-s
diagram for the cycle and determine the
a. temperatures in the evaporator and condenser,
each in °R.
b. compressor and turbine work, each in Btu per
lb of refrigerant flowing.
c. coefficient of performance.
d. coefficient of performance for a Carnot cycle
operating at the reservoir temperatures.
Compare the coefficients of performance
determined in (c) and (d), and comment.
State
1
2
3
4
p (lbf/in.²)
40
140
140
40
Warm region at Tu
wwwwww
Condenser
Turbine
Compressor
Evaporator
www
Cold region at Te
Qua
FIG. 10.1 Carnot vapor refrigeration cycle.
h (Btu/lb)
104.12
114.95
44.43
42.57
TH
Te
s (Btu/lb. ºR)
0.2161
0.2161
0.0902
0.0902

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PART A ONLY ( USE IMAGE BELOW) In a standard ideal refrigeration cycle (Fig. 1), the refrigerant 134a enters adiabatically isolated expansion valve as a saturated liquid at a pressure P1 = 1 MPa and leaves the device at a pressure P2 = 100kPa. Then the refrigerant enters the evaporator, where it changes into the saturated vapor. Subsequently, the vapor is compressed in an isentropic compressor to the pressure 1MPa and condensed in the condenser back to the initial saturated-liquid state. PART A - Determine the heat qL absorbed by the refrigerant in the evaporator and the compressor work win (per 1 kg of the refrigerant).
The evaporator and condenser is isobaric with a net heat transfer 250 W in a vapor-compression refrigeration cycle. The cycle operates with R-134a working fluid at a steady state. The compressor's isentropic efficiency is at 60% with a high pressure of 16 bar and low pressure of 1 bar during the cycle. Solve for the mass flow rate, coefficient of performance, and draw the T-s diagram.
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