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Air at 1 atm and 308.15 K (35°C) is compressed in a staged reciprocating compressor (with intercooling) to a final pressure of 50 atm. For each stage, the inlet gas temperature is 308.15 K (35°C) and the maximum allowable outlet temperature is 473.15 K (200°C). Mechanical power is the same for all stages, and isentropic efficiency is 65% for each stage. The volumetric flowrate of air is 0.5 m3 s-1 at the inlet to the first stage.
(a) How many stages are required?
(b) What is the mechanical-power requirement per stage?
(c) What is the heat duty for each intercooler?
(d) Water is the coolant for the intercoolers. It enters at 298.15 K (25°C) and leaves at 318.15 K (45°C). What is the cooling-water rate per intercooler?
Assume air is an ideal gas with Cp = (7/2)R.
J of heat is removed from the gas as the gas is compressed back to the initial state.
What mass of propane must be burned to furnish this amount of energy assuming the heat transfer process is 60.% efficient?
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A 2300-V, three-phase, wye-connected, round rotor synchronous motor has a synchronous reactance of 3 Ω per phase and an armature resistance of 0.25 Ω per phase. The motor operates on load with a power angle of -15°, and the excitation is adjusted ..
a. What is the melting point at standard conditions for ammonia? Boling point is given -33.4C. b. What is the enthalpy change for boiling ammonia at 0C?
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What is the IRR if the debt must be amortized over 15 years as a fixed cost of production?
the rate of flow to an ammonia synthesis reactor contains 25 mole ltbrgtnitrogen and the balance hydrogen. the flow
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question 1a handling operations for solidpowder substances are often a source of dust generation and are a source of
What is the heat effect when 20 kg of LiCl(s) is added to 125 kg of an aqueous solution containing 10-wt-% LiCl in an isothermal process at 298.15 K (25"C)?
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