The gas expanding in the combustion space of a reciprocating engine has an initial pressure of 50 bar and an initial temperature of 1623 C. The initial volume is 50000 mm' and the gas expands through a volume ratio of 20 according to the law pV constant. Caleulate w and AU Take R = 270 J/Kg K and C, = 800 J/Kg K. Assume n =1.38
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- A 5-feet diameter Chimney is designed to handle a flue gas produced in a steam power plant at a rate of 17 lb/s. The barometric pressure is 29.92-inch Hg. Outside air enters the combustion chamber at 90 F. The average temperature of the flue gas inside the Chimney is 572 F and its molecular weight is 30. Cv = 0.35, Rair = 53.342 ft-lb/lb-R. Calculate: 5. The total draft, feet of air. 6. The height of the Chimney, feetA 5-feet diameter Chimney is designed to handle a flue gas produced in a steam power plant at a rate of 17 lb/s. The barometric pressure is 29.92-inch Hg. Outside air enters the combustion chamber at 90 F. The average temperature of the flue gas inside the Chimney is 572 F and its molecular weight is 30. Cv = 0.35, Rair = 53.342 ft-lb/lb-R. Calculate: a. The total draft, feet of air. b. The height of the Chimney, feetAn automobile cylinder has a minimum volume (top dead center) of 50 cm^3. It’s maximum volume (bottom dead center) is 500 cm^3. If at the start of the compression stroke (bottom dead center) the temperature of the air-fuel mixture is 300 K and it’s pressure is 1E5 Pa. What will be the temperature at the top of that stroke of the pressure has risen to 2E6 Pa?
- Given the pressure - volume diagram (pp1.png). Assume ideal gas undergo cyclic process. Path AB is adiabatic compression while path CD is adiabatic expansion. Also, paths BC and DA are isochoric processes. If the value of γ is 1.5, and the ratio of Vi/Vf = 10. a. Calculate: QDA/QBC b. Calculate WAB assuming initial volume Vi = 2L and Pi = 1 atm.The PV diagram shown in the image applies to 2.1moles of an ideal diatomic gas a) calculate the temperature at all points b) calculate the heat transfer in the path AB, BC, CD, and DA. c) determine the net heat absorb by the system. d) the net work done by the gas and the change in the internal energy for the complete cycle. Determine the total heat input QH and the total heat exhausted QL during the cycle. e) what is the efficiency of this cycleA closed vessel contains 2kg of CO2 at pressure of 60kPa and temperature 27oC. Heat is supplied to the vessel till the gas attains 120kPa of pressure. Calculate. a. Final temperature b. Work done on or by the gas c. Heat added d. Change in internal energy. For CO2 let Cv = 0.65 kJ/kgK
- The following data for steam condenser: Steam condensed = 50000 kg/h; Temperature of steam in condenser = 40 oC; Dryness of steam entering into condenser=0.85; The air leakage in the condenser = 150 kg/h; Temperature of the condensate = 35oC. Find: (1) The air leakage pressure. (2) Quantity of cooling water passed through the condenser per hour if the rise in cooling water temperature is limited to 10oCQuestion 1 0.2804 kg of nitrogen, originally in a cylinder at 200 kPa and 32 oC, is to be compressed polytropically (PVn = C) to a final pressure of 1380 kPa. The volume compression ratio is 5:1. For nitrogen, R = 297 J/kg.K and = 1.41. Calculate:(a) The value of the index n(b) The work done during compression(c) The change in internal energy(d) The change in entropA thermal machine operates with 1.00 mol of an ideal diatomic gas according to the cycle shown in the figure. The molecules of the gas rotate, with only two degrees of freedom of rotation excited, and also vibrate. The volume at stage 1 is V₁ = 25.0 liters. (a) What is the work done by the machine in each cycle? (b) What is the thermal efficiency of the machine? (c) If operated counterclockwise will the machine work as a chiller? Consider Atmospheric pressure: pₐₜₘ = 101325 Pa (a) 459 J; (b) 7.14 %; (c) yes (a) 459 J; (b) 7,14 %; (c) no (a) 712 J; (b) 8,14 %; (c) yes (a) 712 J; (b) 8,14 %; (c) no (a) 2245 J; (b) 34.9 % ; (c) yes (a) 2245 J; (b) 34.9 %; (c) no (a) 2499 J; (b) 28,6 %; (c) yes (a) 2499 J; (b) 28,6 %; (c) no
- A quantity of 0.44 moles of air enters a diesel engine at a pressure of 148 kPa and at a temperature of 60 oC. Find the volume of this quantity of air in unit of L. Take the gas constant R = 8.31 J mol-1 K-1.1) Water vapor with a flow rate of 20000 kg / h enters the condenser of a power plant at a pressure of 20 kPa and a dryness degree of 95 percent. In the condenser, there is heat transfer to the river water flowing through the pipes. The temperature rise of the river water is limited to 10'C to prevent thermal pollution. Since the state of the water at the condenser outlet is saturated liquid at 20 kPa pressure, what should be the flow rate of the cooling water.Problem 2. Ideal gas Oxygen (O2) flows through a well-insulated (adiabatic) nozzle. The cross-section of the nozzle is circular and has a diameter of 15 cm at Station 1. Also, at Station 1 the flow has a pressure of 300 kPa, a temperature of 400 Kelvin, and a velocity of 20 m/sec. At Station 2, the temperature is 390 Kelvin. Friction can be neglected. Please see the attached figure. Find the following: The density at Station 1: ρ1 ______________________________ kg/m3, and the mass flow through the nozzle: ṁ = ________________________kg/sec. 2. Enthalpy change between Stations 1 and 2: (h2 - h1)= _________________ J/kg 3. Velocity at Station 2: V2_______________________ m/sec