Explanatory essay (30%) 5.1 You have a refrigerator located in the garage. Is the performance different in summer than i

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Explanatory Essay 30 5 1 You Have A Refrigerator Located In The Garage Is The Performance Different In Summer Than I 1 (610.3 KiB) Viewed 43 times

Explanatory Essay 30 5 1 You Have A Refrigerator Located In The Garage Is The Performance Different In Summer Than I 2 (518.75 KiB) Viewed 43 times

Explanatory Essay 30 5 1 You Have A Refrigerator Located In The Garage Is The Performance Different In Summer Than I 3 (404.26 KiB) Viewed 43 times

Explanatory Essay 30 5 1 You Have A Refrigerator Located In The Garage Is The Performance Different In Summer Than I 4 (288.89 KiB) Viewed 43 times

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Explanatory Essay 30 5 1 You Have A Refrigerator Located In The Garage Is The Performance Different In Summer Than I 5 (295.56 KiB) Viewed 43 times

Explanatory essay (30%) 5.1 You have a refrigerator located in the garage. Is the performance different in summer than in winter? Explain! 5.2 Why do we study the reverse Carnot cycle even though it is not a realistic model for the refrigeration cycle? 5.3 Why does the indoor unit of the central air conditioning system have a drain hose? 5.4 The vapor compression refrigeration cycle COP is increased when the refrigerant undergoes a subcooled phase before entering the throttling valve. Can the refrigerant be in the subcooled phase indefinitely to maximize this effect, or is there a lower limit? Explain! 5.5 What three considerations are taken into account when selecting refrigerants for household refrigerators? 5.6 Does the area enclosed by the cycle on the Ts diagram represent the net work input for an inverted Carnot cycle? What about the ideal vapor compression refrigeration cycle? 5.7 You see an advertisement claiming that heat pumps are very effective in Atlanta, Georgia. Could that be true? 5.8 Why is the throttling valve not replaced by an isentropic turbine in an ideal vapor compression refrigeration cycle? 5.9 Large office buildings often use air conditioning to cool interior areas even in winter in cold climates. Why? 5.10 Does the ideal vapor compression refrigeration cycle involve internal irreversibility? Essay count (70 %) 5.1 A refrigerator uses refrigerant 134a as the working fluid and operates on the ideal vapor compression refrigeration cycle except for the compression process. The refrigerant enters the evaporator at 120 kPa at 34 percent quality and leaves the compressor at 70oC. If the compressor consumes 450 W of power, determine: a). refrigerant mass flow rate, b). condenser pressure, and c). COP refrigerator. Warm он environment 70°C Condenser Wan Expansion valve Evaporator Compressor Jos 120 kPa x=0.34 Cold environment

5.2 A vapor compression refrigeration system uses Ammonia as the working fluid. Data for cycles is provided in the table below. The main states are numbered as shown in the figure. The heat transfer rate of the working fluid passing through the condenser is 50,000 Btu/hour. If the compressor is operating adiabatically, determine: a). compressor power input, in hp, b). cycle performance coefficient! Cout turint Condenser Expansion A valve Compressor Evaporator ហហហហូប State p (bf/in.7) T() h (Btu/lb) s (Btu/lb-R) 1 30 10 617.07 1.3479 2 200 300 763.74 1.3774 3 200 100 155.05 4 30 155.05 Saturated or superheated vapor 5.3 A room is kept at -5oC through a vapor compression refrigeration cycle with R 134a as refrigerant. The heat is discharged to the cooling water which enters the condenser at 20oC with a mass flow rate of 0.13 kg/s and exits at 280C. The refrigerant enters the condenser at 1.2 MPa and 50oC and comes out as a saturated liquid. If the compressor consumes 1.9 kW of power, determine: a). refrigeration load (Btu/hour) and COP, b). the efficiency of the second law of the refrigerator and the total destruction of exergy in the cycle, c). exergy destruction in the condenser. Use To= 20oC and Cp,air= 4.18 kJ/kgoC! Water 20°C 28°C 0.13 kg's 1.2 MPa sat. liquid 1.2 MPa 50°C Condenser Expansion valve Compressor Evaporator w e

5.4 Consider a Carnot vapor refrigeration cycle with refrigerant 134a as the working fluid. Cycle maintain cool region at 400F when the temperature is around 900F. The main state data in the cycle are given in the table below. The main states are numbered as shown in the figure. Sketch the TS diagram for the cycle and determine: a). temperature in the evaporator and condenser, respectively in R, b). compressor and turbine work, respectively in Btu per lb of refrigerant flow, c). performance coefficient, d). performance coefficient for the Carnot cycle operating at reservoir temperature. Compare the performance coefficients specified in c) and d), and comment. 3 Refrigeration cycle practice questions, 5- Thermodynamics Engineering 2 (20212), Mechanical Engineering (51)-FT, UNSIKA 13 Warm region at Tu ហហហហហហ៍ Condenser TH Turbine Compressor TC Evaporator 4 Juny Cold region at Tc b State 1 2 3 4 p (lbf/in.) 40 140 140 40 h (Btu/lb) 104.12 114.95 44.43 42.57 s(Btu/lb - OR) 0.2161 0.2161 0.0902 0.0902

5.5 Refrigerant 134a enters the housing heat pump condenser at 800 kPa and 50 oC with a mass flow rate of 0.022 kg/s and leaving at 750 kPa cooled at 30C. The refrigerant enters the compressor at 200 kPa superheated by 40C. Determine ; a). compressor isentropic efficiency, b). rate of heat transferred to the heated room, c). COP of heat pump, d). The COP and the rate of heat flow to the heated room if the heat pump is operating on an ideal vapor compression cycle between the pressure limits of 200 and 800 kPa. он 800 kPa 50°C 750 kPa Condenser Expansion valve Evaporator Compressor

Essay count (70 %) 5.1 A refrigerator uses refrigerant 134a as the working fluid and operates on the ideal vapor compression refrigeration cycle except for the compression process. The refrigerant enters the evaporator at 120 kPa at 34 percent quality and leaves the compressor at 70oC. If the compressor consumes 450 W of power, determine: a). refrigerant mass flow rate, b). condenser pressure, and c). COP refrigerator. Warm lu environment 70°C Condenser Expansion valve Evaporator 16000 Compressor 1- 120 kPa x=0.34 e Cold environment