Engineering Thermodynamics

Use this for “A 0.8 m³ tank holds nitrogen (M = 28.01 kg/kmol) at 300 kPa and 298 K. Find the mass of nitrogen in it.”

Use this for “Superheated steam at 400 kPa has h = 2861 kJ/kg at 200 °C and 2965 kJ/kg at 250 °C. Estimate h at 220 °C.”

Use this for “Water is at 500 kPa and 200 °C. Is it compressed liquid, a saturated mixture or superheated vapor?”

Use this for “Gas at 100 kPa is compressed from 0.8 m³ to 0.2 m³ along PVⁿ = constant with n = 1.3. Find P₂ and the work.”

Use this for “2 kg/s of steam enters a turbine at 3230 kJ/kg and leaves at 2600 kJ/kg, losing 20 kW of heat. Find the power.”

Use this for “Steam enters a nozzle at 30 m/s and its enthalpy drops 50 kJ/kg. How fast does it leave?”

Use this for “2 kg/s of water at 335 kJ/kg mixes with 3 kg/s at 84 kJ/kg. Find the outlet enthalpy.”

Use this for “Air goes from 290 K and 100 kPa to 450 K and 600 kPa. Find its entropy change per kilogram.”

Use this for “An air compressor takes in air at 290 K and raises its pressure 6 times with an isentropic efficiency of 0.82. Find the exit temperature and the work per kilogram.”

Use this for “A 5 kg copper block (c = 0.385 kJ/(kg·K)) at 500 K is dropped into a lake at 290 K. Find the entropy generated.”

Use this for “An inventor claims an engine with 55 % efficiency between 700 K and 350 K. Is it possible?”

Use this for “An ideal Otto cycle has a compression ratio of 8, starts at 290 K and takes in 750 kJ/kg of heat. Find T₂, the net work and η.”

Use this for “An ideal Diesel cycle has a compression ratio of 20 and a cutoff ratio of 2.2, starting at 290 K. Find the heat in, the net work and η.”

Use this for “A Rankine cycle runs from 15 kPa to 6 MPa; h₁ = 226, h₃ = 3300 and h₄ = 2200 kJ/kg, v₁ = 0.00101 m³/kg. Find wₚ, qᵢₙ and η.”

Use this for “R-134a leaves the evaporator at 241.3 kJ/kg, the compressor at 278.2 kJ/kg and the condenser at 101.6 kJ/kg; 0.08 kg/s flows. Find the COP and cooling load.”

Use this for “2 kg of N₂ and 1 kg of CO₂ share a tank at 200 kPa. Find the mole fractions, the mixture’s molar mass and R, and each partial pressure.”

Use this for “1.5 kg/s of dry air enters a coil at h = 68 kJ/kg, ω = 0.015 and leaves at 30 kJ/kg, ω = 0.008; condensate leaves at 50 kJ/kg. Find the water removed and the heat.”