3. A vapor-compression refrigeration system circulates Refrigerant 134a at a rate of 6 kg/min. The refrigerant enters the compressor at -10°C, 1.4 bar, and exits at 7 bar. The isentropic compressor efficiency is 67%. There are no appreciable pressure drops as the refrigerant flows through the condenser and evaporator. The refrigerant leaves the condenser at 7 bar, 24°C. Ignoring heat transfer between the compressor and its surroundings, determine (a) The coefficient of performance. (b) The refrigerating capacity, in tons.

3. A vapor-compression refrigeration system circulates Refrigerant 134a at a rate of 6 kg/min. The refrigerant enters the compressor at -10°C, 1.4 bar, and exits at 7 bar. The isentropic compressor efficiency is 67%. There are no appreciable pressure drops as the refrigerant flows through the condenser and evaporator. The refrigerant leaves the condenser at 7 bar, 24°C. Ignoring heat transfer between the compressor and its surroundings, determine (a) The coefficient of performance. (b) The refrigerating capacity, in tons.

Refrigeration and Air Conditioning Technology (MindTap Course List)

8th Edition

ISBN:9781305578296

Author:John Tomczyk, Eugene Silberstein, Bill Whitman, Bill Johnson

Publisher:John Tomczyk, Eugene Silberstein, Bill Whitman, Bill Johnson

Chapter41: Troubleshooting

Section: Chapter Questions

Problem 8RQ: When the outside ambient air temperature is 90F, the temperature of the condensing refrigerant in a...

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Condensers in these refrigerators are all_______cooled.
Refrigerators currently being manufactured in the United States are using______as their refrigerant.
When the outside ambient air temperature is 90F, the temperature of the condensing refrigerant in a standard- efficiency unit should be approximately A. 120F. B. 130F. C. 140F. D. 150F.
The operating condition for the single compressor in a household refrigerator is the lowest box temperature, which is typically A. 0F B. -20F C. 20F D. 40F
A vapor-compression refrigeration system circulates R-134a at a rate (m_dot) of 10 kg/min . The refrigerant enters the compressor at -10 ∘C∘C, 1.2 bar and exits at 7 bar. The isentropic compressor efficiency is 68%. There are no significant pressure drops as the refrigerant flows through the condenser and evaporator. The refrigerant leaves the condenser at 7 bar and 24 ∘C. Ignore the heat transfer between the compressor and its surroundings. (Figure 1) Part A. Determine the coefficient of performance (COPR) Part B. Determine the refrigerating capacity Part C. a. Determine the irreversibility rates of the compressor for an ambient temperature of 20 ∘C b. Determine the irreversibility rates of the expansion valve for an ambient temperature of 20 ∘C
A vapor-compression refrigeration system circulates Refrigerant 134a at a rate of 0.15 kg/s. The refrigerant enters the compressor at -10 degees Celcius, 1 bar, and exits at 8 bar. The isentropic compressor efficiency is 76%. There are appreciable pressure drops as the refrigerant flows through the condenser and evaporator. The refrigerant leaves the condenser at 8 bar and 30 degrees Celcius. Ignoring the heat transfer between the compressor and its surroundings, determine: a) The rate at which energy is removed from the refrigerated space in kW b) The coefficient of performance
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Please help!!!! Refrigerant 22 enters the compressor of an ideal vapor-compression refrigeration system as saturated vapor at -30°C with a volumetric flow rate of 10 m3/min. The refrigerant leaves the condenser at 19°C, 9 bar. Determine: (a) the magnitude of the compressor power, in kW. (b) the refrigerating capacity, in tons. (c) the coefficient of performance. (d) the rate of entropy production for the cycle, in kW/K. Answer for part (a): 52 kW Answer for part (b): 59 tons Answer for part (c): 3.98 Please answer part also d! That's the part I also need. Thank you!
**** PART C ONLY 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. USE IMAGE BELOW FOR PART C
you design a custom refrigeration system using 1,1,2-tetrafluoroethane (R-134a) as refrigerant.You design your ideal compression-based refrigeration cycle to operate between 2 bar and 9 bar. Before enteringthe ideal butterfly valve (delta H = 0), the refrigerant is a saturated liquid. Before entering the compressor, therefrigerant is saturated vapor. In fact, in isentropic operation, the refrigerant which leaves the compressor is alsosaturated vapor. The operation of the compressor and the evaporator is isobaric. Assuming a mass flow rate of1.5 kg / s, determine the compressor efficiency required to achieve a coefficient of performance of 6.96. Whatis ?? ̇ et ?? ̇ to this performance.
The following data for the R-12 refrigeration system as shown are as follows: Evaporator 1 0 OC 30 TOR Evaporator 2 -10OC 20 TOR Evaporator 3 -20OC 10 TOR Condenser 20OC Assume simple saturation and isentropic compression and determine the following: a) Draw the h-s diagram b) The refrigerant flow in each evaporator c) Total work of compression, WC in kW d) Heat rejected in the condenser, QR in kj/min e) Coefficient of performance
Using Refrigeration 22 Table: PROPERTIES OF LIQUID AND SATURATED VAPOR An R22 standard refrigerating cycle operates at an evaporator pressure of 367.01 kPa and a condensing pressureof 1833.45 kPa. It is desired to increase the evaporator pressure from 367.01 to 602.28 kPa. DetermineFor 367.01 kPa Evaporator(a) temperature and degree superheat leaving the compressor(b) mass of vapor entering the evaporator(c) evaporator load(d) condenser load(e) work on the compressor(f) coefficient of performanceFor 602.28 kPa Evaporator(g) temperature and degree superheat leaving the compressor(h) mass of vapor entering evaporator 18 answers(i) evaporator load(j) condenser load(k) work on the compressor(l) coefficient of performanceShow the effects of increasing evaporator pressure(m) condenser load per ton of refrigeration(n) work on compressor per ton of refrigeration(o) mass flow rate of refrigerant per ton of refrigeration(p) volume capacity of compressor per ton of refrigeration R22 standard…