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- A tank with an internal volume of 1 m3 contains air at 800 kPa and 25°C. A valve on the tank is opened, allowing air to escape, and the pressure inside quickly drops to 150 kPa, at which point the valve is closed. Assume there is negligible heat transfer from the tank to the air left in the tank. Calculate the mass removed if the variation of he is accounted for.arrow_forwardProblem 4 A 0.15-m rigid tank initially contains R-134a as saturated vapor R-134a at 0.6 MPa. The tank is connected by a valve to a supply line that carries R-134a at 1 MPa and 26°C. The valve is now opened, allowing the refrigerant to enter the tank, and is closed when it is observed that the tank contains only saturated liquid at 0.8 MPa. Neglecting kinetic and potential energy changes, determine, 1 MPa 26°C R-134a 0.15 m a) The mass of the refrigerant that entered the tank, in kg b) The amount of heat transfer to or from the surroundings in kJarrow_forwardAn 8 kW compressor blows the air at 22 C and 100 kPa to 1600 kPa. reversibly to the pressure (P v n = constant). In addition, heat transfer to the surrounding environment at 22 °C. is happening. (n = 1.33) a) Find the compressor work expression (integrating) according to the Pvn interchange and the result is n, R, T1, Express it in terms of P1, P2. b) Find the mass flow and outlet temperature of the air. c) Find the total irreversibility by applying the exergy balance. d) Find the isentropic efficiency of the compressor (k=1.4). e) In case of using two compressors with intercooler, the intermediate pressure (Px) is in terms of P1 and P2. take the derivative and find the total compressor power in this case and add it to a single compressor. Determine your gain in kW according toarrow_forward
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