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A refrigeration cycle operating between two reservoirs receives energy QC from a cold reservoir at TC = 280 K and rejects energy QH to a hot reservoir TH = 330 K. For each of the following cases determine whether the cycle operates reversibly, irreversibly, or is impossible: (a) QC = 1500 kJ, QH = 2200 kJ, (b) QC = 1500 kJ, Wcycle = 120 kJ, (c) QH = 1600 kJ, Wcycle = 500 kJ, (d) Coefficient of performance (COP) = 6.
a cylindrical stone mix concrete beam of diameter d 0.45 initially at ti 20c is exposed to hot gases at tinfinity
low level heat energy is exhausted continually to a large body of water at the rate of 22mjhour. assuming the lake
a gas turbine burns methane with 150 theoretical air. assume the air is 25 degrees celsius 100 kpa and has a relative
5 kg of steam contained within a piston-cylinder assembly undergoes an expansion from state 1 where the specific
determine the mass flow rate of fuels in grams per second from the gasoline tank to the cars fuel injection systems and
a railcar with an overall mass of 75000 kg traveling with a velocity vi is approaching a barrier equipped with a bumper
Determine the mass flow rate of the air passing through this engine and the rates of heat addition and rejection when this engine produces 1000 hp. Assume constant specific heats at room temperature.
a commercially available sump pump is capable of deliver-ing 2800 gallons per hour of water through a vertical lift of
A rocket nozzle has a chamber pressure of 20 Bar (2 MPa) and a chamber temperature of 2750 K. The rocket is designed to operate isentropically at 12,500 m altitude. Note that the pressure at 12,500 m can be estimated using this equation P/P0 = exp [-..
A particular motor has the following specifications: no load speed = 5000 rpm, stall torque = 200mN-m, no load current = 0.25 A, rated operating = 2500 rpm, 100mN-m, 5A. Create the speed-torque curve, torque-current curve, power-torque curve, and det..
steam with 88.6% quality and a flow rate of 750 kg/s enters a condenser operating @ 75 KPa. Saturated liquid leaves the condenser. How much heat is rejected to the cooling system.
during the construction of a house 6 joists of 24 feet each must be trimmed to the correct length of 23 feet. the
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