(1) A reversed Carnot cycle is used for refrigeration and rejects 1,000 kW of heat at 340 K while receiving heat at 250 K. Determine (a) COP, (b) the power required, and (c) the refrigerating effect. Ans. (a) 2.778, (b) 264.7 kW (c) 735.3 kW
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- Why is two-stage compression popular for extra-low-temperature refrigeration systems?(1) A reversed Carnot cycle is used for refrigeration and rejects 1,000 kW of heat at 340 K while receiving heat at 250 K. Determine (a) COP, (b) the power required, and (c) the refrigerating effect. Ans. (a) 2.778, (b) 264.7 kW (c) 735.3 kWA reversed Carnot cycle has a refrigerating COP of 4. (a) What is the ratio Tmax/Tmin? (b) If the work input is 6 kW, what will be the maximum refrigerating effect, kJ/min and tons. (2) Ans. (a) 1.25, (b) 6.82 TR A reversed Carnot engine removes 40,000 kW from a (3) heat sink. The temperature of the heat sink is 260 K and the temperature of the heat reservoir is 320 K. Determine the power required of the engine. Ans. 9230.7 kW
- A standard vapor compression system produces 70.4 kW of refrigeration using R-12as a refrigerant while operating between a condenser temperature of 42 °C and anevaporator temperature of –25 °C.2.1 Draw the p-h diagram of the cycle. 2.2 Determine:(a) the refrigerating effect in kJ/kg, (b) the circulating rate in kg/s, (c) the power supplied, (d) the COP, (e) the heat rejected in kW, and(f) the volume flow rate in m3/s.(2) A reversed Carnot cycle has a refrigerating COP of 4. (a) What is the ratio Tmax/Tmin? (b) If the work input is 6 kW, what will be the maximum refrigerating effect, kJ/min and tons. Ans. (a) 1.25, (b) 6.82 TRA vapor compression refrigeration cycle operates at steady flow conditions with 0.25 kg/s or R-134a. The table below shows some of the operating parameters and properties for the refrigerant. The compressor is réfrigerated, and the condenser is also cooled with water. The compressor receives shaft power equivalent to 7.5 hp. Neglecting changes in kinetic and potential energy changes and any heat loss between devices, please answer the following. a. Complete the table below and sketch the cycle processes on a T-s diagram. When completing the table please use the same number of decimal places as in the tables. b. 123456 Determine the cooling capacity of the refrigeration unit, in Tons (1 refrigeration Ton=211 kJ/min). c. Compute the COP d. Determine the volume flow rate of refrigerant entering the condenser in L/min. e. Determine the mass flow rate of cooling water passing through the condenser. 1. Determine the heat transfer rate from the compressor. g. Compute the rate of entropy…
- A vapor compression refrigeration cycle operates at steady flow conditions with 0.25 kg/s or R-134a. The table below shows some of the operating parameters and properties for the refrigerant. The compressor is refrigerated, and the condenser is also cooled with water. The compressor receives shaft power equivalent to 7.5 hp. Neglecting changes in kinetic and potential energy changes and any heat loss between devices, please answer the following. a. Complete the table below and sketch the cycle processes on a T-s diagram. When completing the table please use the same number of decimal places as in the tables. 123456 b. Determine the cooling capacity of the refrigeration unit, in Tons (1 refrigeration Ton = 211 kJ/min). c. Compute the COP. d. Determine the volume flow rate of refrigerant entering the condenser in L/min. e. Determine the mass flow rate of cooling water passing through the condenser. f. Determine the heat transfer rate from the compressor. g. Compute the rate of entropy…Choose the correct answer: 1. In a closed or dense air refrigeration cycle, the operating pressure ratio can be reduced, which results in............ coefficient of performance. (a) lower (b) higher 2- The efficiency of Carnot heat engine is 80%. The C.O.P. of a refrigerator operating on the reversed Carnot cycle is equal to (a) 0.25 9- (b) 0.40 (c) 0.60 (d) 0.80 3. In a refrigerating machine, if the lower temperature is fixed, then the C.O.P. of the machine can be increased by (a) increasing the higher temperature (c) operating the machine at a lower speed (b) decreasing the higher temperature (d) operating the machine at a higher speed 4. The highest temperature during the cycle, in a vapour compression refrigeration system, occurs after (a) compression (b) condensation (c) expansion (d) evaporation 5- A system with multiple evaporators at different temperatures with compound compression will (a) increase the power requirements (b) reduce the power requirements (c) neither increase…5. The temperature in a refrigerator coil is 267 K and that in the condenser coil is 295 K. Assuming that the machine operates on the reversed Carnot cycle, calculate : (i) C.O.P. (ii) The refrigerating effect per kW of input work. (iii) The heat rejected to the condenser. [Ans. (i) 9.54 (ii) 9.54 kW (iii) 10.54 kW]
- 4. A reversed Carnot cycle is used for refrigeration and rejects 1000kW of heat at 670 while receiving heat at -23C. Determine (a) COP, (b) the power required and (c) the refrigerating effect.Data are provided for two reversible refrigeration cycles. One cycle operates between hot and cold reservoirs at 27°C and 3°C, respectively. The other cycle operates between the same hot reservoir at 27°C and a cold reservoir at -35°C. The refrigerator removes the same amount of energy by heat transfer from its cold reservoir. Determine the ratio of the net work input values of the two cycles, WCycle,2 Wcycle,16.7 A gas engine-based trigeneration plant delivers heat and power at the fol- lowing rates: • 90 kJ/s of heat for water heating and 110 kW of electricity over 12 h (5) a day 110 kW of electricity and 100 kJ/s of heat for absorption cooling over 12 h (t,) a day Plant overall efficiency in heating and power generation mode is EUF, = 87%, which in cooling and power generation mode is EUF, = 75%. The fuel in the gas engine is natural gas with an LHV of 49 MJ/kg. Calculate (i) the total useful energy production by the trigeneration plant in a day, (ii) the trigeneration plant average EUF value, and (iii) the monthly fuel energy and fuel requirements of the trigeneration plant.