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- Why is two-stage compression popular for extra-low-temperature refrigeration systems?Define net refrigeration effect as it applies to the refrigeration cycle.An ideal ammonia (R – 717) vapor-compression refrigeration cycle has an evaporator temperature of –20 C and a condenser pressure of 12 bar. Saturated vapor enters the compressor, and saturated liquid exits the condenser. The mass flow rate of the refrigerant is 3 kg/min. Determine the coefficient of performance.
- An ideal ammonia (R – 717) vapor-compression refrigeration cycle has an evaporator temperature of –20 C and a condenser pressure of 12 bar. Saturated vapor enters the compressor, and saturated liquid exits the condenser. The mass flow rate of the refrigerant is 3 kg/min. Determine the amount of heat rejected in the condenser, kJ/min.What is the COP of an ideal heat-operated refrigeration cycle that receives the energizing heat from a solar collector at a temperature of 70 °C, performs refrigeration at 15 °C, and rejects heat to atmosphere at a temperature of 40°C?What is the COP of an ideal heat-operated refrigeration cycle that receives the energizing heat from a solar collector at a temperature of 70 K, perform refrigeration at 15 K, and rejects heat to atmosphere at a temperature of 35 K?
- 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 performanceAn ideal ammonia (R – 717) vapor-compression refrigeration cycle has an evaporator temperature of –20 C and a condenser pressure of 12 bar. Saturated vapor enters the compressor, and saturated liquid exits the condenser. The mass flow rate of the refrigerant is 3 kg/min. Determine the compressor work, kW.A vapor compression refrigerating cycle uses refrigerant 22 has the following data. Temperature at evaporator is at -1°c and the pressure at the condenser is at 1535.5 KPa find: A. Refrigerating effect in kj/kg. B. Work of the compressor in kj/kg. C. COP, D. Heat rejected in kj/kg For a 1 ton refrigerating capacity determine E. Mass flow rate. F. Volume flow rate. g. Actual work of the compressor in kW H. Actual heat rejected in kW
- PROBLEM 2Consider a Brayton refrigeration cycle where air enters the compressor at 100 kPa, 280Kand is compressed to 400 kPa. The temperature at the turbine inlet is 340K. Thecompressor and turbine have isentropic efficiencies of 70% and 80%, respectively.Questions:Determine:(a) The refrigeration capacity per unit of mass flowing.(b) The net work input.(c) The Coefficient of Performance.QUESTION 2 The reason for the reversed carnot cycle not to be suitable for refrigeration cycles is a. Not effecient b. The COP dcreases as the Condenser temperature rises and the evaporator temperature falls c. The isentropic processes are not practical d. It requires an oversized compressorPART 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).