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- 8. . Equation for Law of conservation of mass and energy for a nozzle isConsider the extraction of energy from the tail gases from a nitric acid adsorption tower, such as that described in Chapter 4, Example 4.4. Gas composition, kmol/h: 0₂ N₂ NO NO₂ H₂O 371.5 10,014.7 21.9 Trace saturated at 250°C If the gases leave the tower at 6 atm, 25°C, and are expanded to, say, 1.5 atm, calculate the turbine exit gas temperatures without preheat, and if the gases are preheated to 400°C with the reactor off-gas. Also, estimate the power recovered from the preheated gases.A three stage reciprocating flow compressor is designed to compress 800 litres of oxygen per minute at 30˚ C from 1 atm. Abs. Pressure to 100 atm. abs. pressure. inter cooling at every stage is done at 30 ˚ C. Calculate the theoretical work in litre-atmosphere per minute required for reversible adiabatic compression of the gas, taking that the gas is ideal. What should be the discharge pressure for each stage cp / cv = 1.4 for this gas.
- There are compressed 11.33 m3/min of air from 103.42 kPa, 26.7°C to 827.36 kPa. All clearances are 8%. (a) Find the isentropic power and piston displacement required for a single stage compression. (b) Using the same data, find the minimum ideal power for two-stage compression when the intercooler cools the air to the initial temperature . (c) Find the displacement of each cylinder for the conditions of part (b). (d) How much heat is exchanged in the intercooler? (e) For a compressor efficiency of 78%, what driving motor output is required?7.42. Jets of high-speed steam are used in spray cleaning. Steam at 15.0 bar with 150°C of superheat is fed to a well-insulated valve at a rate of 1.00 kg/s. As the steam passes through the valve, its pressure drops to 1.0 bar. The outlet stream may be totally vapor or a mixture of vapor and liquid. Kinetic and potential energy changes may be neglected. (a) Draw and label a flowchart, assuming that both liquid and vapor emerge from the valve. (b) Write an energy balance and use it to determine the total rate of flow of enthalpy in the outlet stream (Hout = mH¡ + m,Ĥv). Then determine whether the outlet stream is in fact a mixture of liquid and vapor or whether it is pure vapor. Explain your reasoning. Problems 393 (c) What is the temperature of the outlet stream? (d) Assuming that your answers to Parts (b) and (c) are correct and that the pipes at the inlet and outlet of the valve have the same inner diameter, would AĖk across the valve be positive, negative, or zero? Explain your…Evaporative cooling PLEASE DO NOT USE PSYCHROMETRIC CHART. THANK YOU In the diagram below inlet air is drawn over a pool of liquid water in a steady-state, steady-flow isobaric process. Evaporation on the pool resultsin saturated air at the exit. The pool of liquid water is assumed to be at the same temperature as the exitair. Discharge fans at the exit provide a volumetric flow rate of 800,000 ft3/min. In the diagram above inlet air is drawn over a pool of liquid water in a steady-state, steady-flow isobaric process. Evaporation on the pool resultsin saturated air at the exit. The pool of liquid water is assumed to be at the same temperature as the exitair. Discharge fans at the exit provide a volumetric flow rate of 800,000 ft^3/min. Problem #1: Assume that the exit temperature is T2 = 90 °F. For this model of the system and from thedata provided determine:a) The mass flow rate dry air through the system (lbm/sec).b) The rate of heat that is output from the R-134a condenser Qout…
- WHAT IS THE PURPOSE OFGAS COMPRESSOR WITH MULTI-STAGE COMPRESSION?The following parameters are recorded on a gas turbine test rig. Stage-1: Inlet temperature is 5000C, Inlet pressure is 650kPa. Exit gas pressure 150kPa. Determine the exit gas temperature for isentropic process. Stage-2 Gas is again heated to 4500C by constant volume process. Assume R=287 J/kg.K; Determine the heat added to the gas assuming Cp/Cv=1.4 and Cp/Cv=1.3; Draw the T-S diagram for the above process.At a certain pair in a reaction turbine, the steam leaves the fixed blade at a pressure of 3 bar with a dryness fraction of 0.98 and a velocity of 130 m/sec. The ratio of axial velocity of 130 m/sec. The blades are 20mm high and discharge angle for both the rings is 20°. The ratio of axial velocity of flow to the blade velocity is 0.7 at inlet and 0.76 at exit from the moving blade. If the turbine uses 4 kg of steam per second with 5% tip leakage. Find the mean blade diameter and the power developed in the ring.
- 6 (b) Throttling 10 kg/s of steam at 20 bar, 250°C reduces the power output of the turbine (as shown in the figure) by 20%. The turbine has an isentropic efficiency of 0.8 and the exit pressure of the turbine is 10 kPa. Steam @20 bar, 250°C Throttle Turbine 10 kPa Compute the power output when the steam is not throttled. ii. i. Compute the quality and enthalpy at the exit of the turbine in the throttled operation. Compute the rate of irreversibility in the throttle, taking the ambient temperature to ii. be 300 K. v (m/kg) h (kJ/kg) 2902.46 s (kJ/kgK) T°C P bar u (kJ/kg) V 250 20 0.11144 2679.58 6.5452 h; (kJ/kg) htg (kJ/kg) St (kJ/kg-K) Siz (kJ/kg-K) 7.5010 P kPa T°C 10 45.81 191.81 2392.82 0.6492Vaporsat enters a throttling valve at 0.42 MPa and leaves at 0.69 MPa. What is the state and temperature of the exit stream?QUESTION 14 An industrial refrigeratot uses (NH3) Ammonia, and a reciprocating compressor. At the begining of compression the refrigerant is dry staurated at 1bar and operates adibatically with index 1.3 and copression ratio 20. At the final stage, the fluid is saturated vapour. Using the prescribed property table, the specific volume after compression is (to 4 d.p) in (unit symbol). The volumetric ratio is (to 4.d.p) and the final specific volume is (to 2 d.p.). The work done on the refrigerant during the process is (to 1 d.p in kilo of unit symbol). The initial specific enthalpy of dry saturated (2 d.p) in (kilo of unit symbol), while that refrigrant is of after compression is (1 d.p) in (kilo of unit symbol) and the initial specific internal energy of dry saturated refrigrant is (2 d.p) in (kilo of unit symbol) then (3 d.p) in (kilo of unit symbol) after compression. The heat transferd per unit mass to the or from the the cylinder walls during the process is (to 2 d.p. in kilo of…