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A large slab of concrete, 5 × 8 × 0.3 m, is used as a thermal storage mass in a solar-heated house. If the slab cools overnight from 23°C to 18°C
A long roll of 2-m-wide and 0.5-cm-thick 1-Mn manganese steel plate (r = 7854 kg/m3 and cp = 0.434 kJ/kg) coming off a furnace at 820°C
A large fraction of the thermal energy generated in the engine of a car is rejected to the air by the radiator through the circulating water
A liquid water turbine receives 2 kg/s water at 2000 kPa, 20oC and velocity of 15 m/s. The exit is at 100 kPa, 20oC and very low velocity
A line with a steady supply of octane, C8H18, is at 400°C, 3 MPa. What is your best estimate for the availability in an SSSF setup
A large stationary diesel engine produces 20 000 hp with a thermal efficiency of 40%. The exhaust gas, which we assume is air, flows out at 1400
A large stationary Brayton cycle gas-turbine power plant delivers a power output of 100000 hp to an electric generator.
A manometer is used to measure the air pressure in a tank. The fluid used has a specific gravity of 1.25, and the differential height between the two arms
A manometer containing oil (r = 850 kg/m3) is attached to a tank filled with air
A man goes to a traditional market to buy a steak for dinner. He finds a 12-oz steak (1 lbm = 16 oz) for $3.15.
A major force opposing the motion of a vehicle is the rolling resistance of the tires F is given by Fr= F W
A house that is losing heat at a rate of 80,000 kJ/h when the outside temperature drops to 15°C is to be heated by electric resistance heaters.
A hydraulic lift is to be used to lift a 2500 kg weight by putting a weight of 25 kg on a piston with a diameter of 10 cm. Determine the diameter of the piston
A househusband is cooking beef stew for his family in a pan that is
A household refrigerator with a COP of 1.2 removes heat from the refrigerated space at a rate of 60 kJ/min, determine
A household refrigerator that has a power input of 450 W and a COP of 2.5 is to cool five large watermelons, 10 kg each, to 8°C
A household freezer operates in a room at 20°C. Heat must be transferred from the cold space at a rate of 2 kW to maintain its temperature at -30°C.
A household fan of diameter 0.75 m takes air in at 98 kPa, 22oC and delivers it at 105 kPa, 23oC with a velocity of 1.5 m/s. What are the mass flow rate (kg/s)
A hydraulic turbine has 85 m of elevation difference available at a flow rate of 0.25 m3/s and its overall turbine- generator efficiency is 91 percent.
A heat-powered portable air compressor consists of three components:
A hollow spherical iron container whose outer diameter is 20 cm and thickness is 0.4 cm is filled with iced water at 0°C.
A jet plane travels through the air with a speed of 1000 km/h at an altitude of 6 km, where the pressure is 40 kPa and the temperature is -12°C.
A heavily insulated cylinder/piston contains ammonia at 1200 kPa, 60°C. The piston is moved, expanding the ammonia in a reversible process until the temperature
A jet engine receives a flow of 500 ft/s air at 10 lbf/in 2, 40 F inlet area of 7 ft2 with an exit at 1500 ft/s, 10 lbf/in 2, 1100 R
A Hilch tube has an air inlet flow at 20?C, 200 kPa and two exit flows of 100 kPa, one at 0°C and the other at 40°C.