In an ideal regenerator, is the air leaving the compressor heated to the temperature at slightly above the turbine exit?
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In an ideal regenerator, is the air leaving the compressor heated to the temperature at slightly above the turbine exit?
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- Welded ______sealed compressors are normally used in household refrigerators.A refrigerant 22 vapor compression system includes a liquid-to-suction heat exchanger in the system. The heat exchanger cools the saturated liquid from the condenser from 32°C to 21°C with vapor which comes from the evaporator at -10°C. The compressor is capable of pumping 20 L/sec of refrigerant. What is the enthalpy of the refrigerant at the suction of the compressor neglecting the heat exchanger? What is the isenthalpic value of the refrigerant in the system neglecting the heat exchanger? What is the refrigerant's enthalpy after compression? What is the COP of the system neglecting the heat exchanger? What is the enthalpy of the refrigerant before it enters in the expansion valve? What is the approximate enthalpy of the refrigerant at the suction of the compressor? What is the estimated enthalpy of the refrigerant after compression? What is the COP of the system? What is the refrigerating capacity of the system in TOR if: a.) without hex and b.) with hex?Define the Reversible Adiabatic Compression
- An ideal vapor compression cycle operates between the temperature limits of -5 °c and 30 °C and uses R134a as the refrigerant, which flows at a rate of 0.6 kg/s. The P-h- as well as T-s-diagrams that illustrate the refrigerating process is given in diagram, and respectively. Refigerant is compressed to the state in the compressor and heat is rejected in the condenser at constant for ideal Vapour compression cycle.A system consists of one compressor and two evaporators. One evaporator carries a load of 35kw at 10°c and the other load of 20kw at -5°c. A back pressure value reduces the pressure in the10°c to that of the -5°c evaporator. The condensing temperature is 37°c. The refrigerant is ammonia. A. Determine the enthalpy of the refrigerant leaving the condenser. B. The massflow rate at the low-pressure evaporator. C. The mass flow rate at the high-pressure evaporator.Why is the starting fan required in the gas turbine experimental setup?
- In a marine gas turbine unit, a high-pressure stage turbine drives the compressor and a low-pressure stage turbine drives the propeller through suitable gearing. The overall pressure ratio is 4/1 and the maximum temperature is 650 oC. the isentropic efficiencies of the compressor, H. P. turbine, L. P. turbine are 0.8, 0.83 and 0.85 respectively and the mechanical efficiency of both shafts is 98 %. Sketch the process on the T-s diagram Calculate the pressure between turbine stages when the air intake conditions are 1.01 bar and 25 oC. Calculate also the thermal efficiency and the shaft power when the mass flow is 60 kg/s. NB: Neglect kinetic energy changes and the pressure loss in combustion.A turbojet aircraft moving with a velocity of 790 ft/s at a runway where the pressure& temperature is found to be 14.7psi & 546R. The axial flow compressor provides apressure ratio of 14 to 1. Temperature at the turbine inlet is 2000R. The mass flowrate of airinside the engine is 133 lbm/s. Determine the following:a. T-S diagramb. Pressure & temperature at each statec. Thrust force (lbf)d. Propulsive power developed (BTU/min)e. Propulsive EfficiencyIn an ideal regenerator, is the air leaving the compressor heated to the temperature at the turbine exit?
- A trubo-charge, 16 cylinder, vee-type diesel engine has an air comsumpyion of 3000 kg/hr per cylinder at rate load and speed. this air is drawn in through a filter by a centrifugal compressor directly connected to the exhaust gas turbine. the temperature of the air from the compressor to 145 C and a counter flow air cooler reduced the air temperature to 45 C. before it goes to the engine suction header. cooling water enters air at 30 C and leaves at 38 C. calculate the quantity of the cooling water in m/hr required to cool the total air requirement of the engine at rate load and speed. ( hint: use AMTD)Refrigerant R12 is used in a vapour compression cycle. The saturated vapour entersthe compressor at -18.8°C, and subsequently leaves at 75°C and 10 bar. Thesaturated liquid leaving the condenser is at 10 bar. The resulting stream is throttledand evaporated before being fed back to the compressor. a) Determine the coefficient of performance of the refrigerator. Take the specific enthalpy,h, at 10 bar and 36 K of superheat to be 163.7 kJ/kgb) Obtain the isentropic efficiency of the compressor. Take the specific entropy, s, at 10bar to be 1.188 kJ/kgAn air refrigerator working on the principle of Bell-Coleman cycle. The air into thecompressor is at 1 atm at -10oC. It is compressed to 10 atm and cooled to 40oC at the samepressure. It is then expanded to 1 atm and discharged to take cooling load. The aircirculation is 1 kg/s. The isentropic efficiency of the compressor and expander is 80% and90 % respectively. Find the following:i) Refrigeration capacity of the systemii) C.O.P of the system, Take γ = 1.4, Cp = 1.00 kJ/kg oC