One of the following cannot be used as thermal mass. O a. Water O b. Rock O c. Bricks O d. Wood
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- At the start of compression in an air standard Otto cycle with a compression ratio of 10, air is at 100 kPa and 313.15 K. A heat addition of 2800 kJ/kg is made. Calculate the thermal efficiency. For air, use k=1.4Derive the relation for adiabatic compressibility for ideal gas.The following information is given for n-pentane at 1 atm:boiling point = 36.20°C ΔHvap (36.20°C) = 357.6 J/g melting point = − 129.7°C ΔHfus (−129.7°C) = 116.7 J/g specific heat gas = 1.650 J/g ⋅ °C specific heat liquid = 2.280 J/g ⋅ °C A 26.10-g sample of liquid n-pentane is initially at −51.40°C. If the sample is heated at constant pressure (P = 1 atm), how many kJ of energy are needed to raise the temperature of the sample to 65.30°C?
- Calculate the percent volatility of the solids given that an empty container weighs 15.7g. A sample from the aeration tank is put in the container. At temperature 104 degC , the container now weighs 21.2211g. It was further heated in a furnace with a temperature of 540degC and gained a constant weight of 20.5057.4. A town is covered by an inversion layer 500 m above the ground. The town’s area isapproximately rectangular with dimensions 9 km by 12 km. The incoming air is clean andthe wind is blowing at 3 m/s, parallel with the 12 km side of the town. SO2 emissions inthe town come from a number of small sources and average 0.0008 mg/m2-s. An industrialplant also emits 2,150 kg/day of SO2. Assume the air above the town is well-mixed.Calculate the state-state concentration of SO2 in the town’s air.A gas expands from 0.03 m3 to 0.05 m3 at constant pressure of 3.5 atm. Determine the work done.
- thermodynamics for this problem the elevation is 65 meters.In the tank of 100 liters of brine containing 50kg totally dissolved salt. Pure water is allowed to run into the tank at the rate of 3 liters per minute. Brine runs out of the tank at rate of 2 liters minute. The instantaneous concentration in the tank is kept uniform by stirring. How much salt is in the tank at the end of 1.7 hour?Dusty air at a fertilizer plant flows through a 70%-efficient cyclone and then through an ESP. The inlet air to the cyclone has a dust loading of 50 grains/cubic foot. The outlet air from the ESP actually contains dust at 0.50 grains/cubic foot. Calculate the efficiency of the ESP.