(c) work on compressor in kW (d) work on compressor per ton of refrigeration (e) coefficient of performance
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- The defrost cycle in a domestic refrigerator may be terminated by two methods: ___and___.When a standard-efficiency air-cooled condenser is used, the condensing refrigerant will normally be higher in temperature than the entering air temperature.What are the approximate temperature ranges tor low-, medium-, and high-temperature refrigeration applications?
- The condensing pressure is 260 psig and the condenser outlet temperature is 108F for R-22. By how many degrees is the liquid subcooled in the condenser? A. 12F B. 42F C. 7F D. 14FA typical temperature relationship between a high-efficiency condenser and the ambient temperature is A. 10F. B. 20F. C. 30F. D. 40F.A regenerative air refrigeration system is designed to take a load of 30 tons of refrigerationload of an aircraft cabin. The pressure of air is increased from 0.8 bar to 1.2 bar byramming action. The air required for the refrigeration is bled from the main compressor at4.8 bar. The effectiveness of the HE-I (when rammed air is used) is 0.6. The air coming outof HE-I is passed through the cooling turbine and some portion of the air coming out fromthe cooling turbine is used in HE-II (known as regenerative Heat Exchanger) whererefrigeration air is cooled to 50oC. The temperature of the air coming out of He-II is 100oC.The cabin is maintained at 1 bar and 25oC. The ambient temperature is 7oC. Assumingramming is isontropic and ηc1 = 90% and ηt = 80%, find(a) The percentage of the air extracted from the cooling turbine used in regenerativeheat exchanger.(b) Power required to run the system.Assume that the power developed by the cooling turbine is used for running the ram airexhaust fan.
- A vapour-compression refrigeration system operates with Refrigerant 134 with two evaporators with varying cooling capacity. The low temperature evaporator (#1) operates at -20°C with saturated vapour at its exit and has a refrigeration capacity of 3 tons. The higher temperature evaporator (#2) produces saturated vapour at 3.6 bar at its exit and has a refrigerating capacity of 2 tons. Compression is isentropic to the condenser pressure of 12 bar. There are no pressure drops in the flow through the condenser and the two evaporators and the refrigerant leaves the condenser as saturated liquid at 12 bar. Determine: The mass flow rate of the refrigerant in kg/s through each evaporators;The power input for the compressor, in kW;The coefficient of performance of this refrigeration system;The heat transfer through the condenser in kW;The rates of exergy destruction in each expansion valves in kW for T0 = 300K;Draw the T-s diagram of this system.In a refrigerant 12 system which serves a 250 kw evaporator at -30°C. The system uses two stage compression with intercooling and removal of flash gas. The condenser temp is 40°C. h2 = 357 kJ/kg, h4 = 365 kJ/kg Compute the ff:- mass flow rate at low stage compressor (m1), answer must be in kg/s- mass flow rate at high stage compressor (m3), answer must be in kg/s- low stage compressor work, answer must be in kwAn 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.