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A heat pump with a coefficient of performance of 3.5 provides energy at an average rate of 70,000 kJ/h to maintain a building at 208C on a day when the outside temperature is 258C. If electricity costs 8.5 cents per kW ? h,
(a) Determine the actual operating cost and the minimum theoretical operating cost, each in $/day.
(b) Compare the results of part (a) with the cost of electrical- resistance heating.
a reversible carnot power cycle operates between reservoirs th and tl. to increase the thermal efficiency of the cycle
An air compressor compresses air from 1 bar and 300 K to 5 bar and 540 K. The velocity at the inlet is 70 m/s and the velocity at the exit is 150 m/s. If To = 300 K and Po = 1bar.
a pipe is sealed at the top and is submerged in water. it is then drawn upward from the water. how tall could the
During the process, a pressure-relief valve allows nitrogen to escape, maintaining constant pressure in the tank. Neglecting kinetic and potential energy effects, and using the ideal gas model with constant specific heats evaluated at 350 K, deter..
saturated vapor steam at 5 psia eneters an adiabatic heat exchanger and leaves as saturated liquid at 5 psia. the steam
an industrial process requires that a liquid be stirred. an electric motor is used to drive the stirring device. the
Find the principal stresses in the sleeve after it cools to 20?C. Assume that friction between the shaft and the sleeve prevents any sliding at the interface during cooling, and assume that the shaft is so massive and stiff that strains in the sha..
a 5-lb roast initial at 70degf is placed in an oven at 350degf. you may assume the heat transfer coefficient is 2.5
Determine the stress to cause yielding using Von Mises criteria for the system sx=20MPa,sy=10MPa, and txy=3MPa. Use the following two different approaches.Use the Von Mises criteria directly. syield (in MPa):
A 17-tooth 20 normal pressure-angle helical pinion with a right-hand helix angle of 30 rotates at 1800 rev/min when transmitting 4 hp to a 52-tooth helical gear. The normal diametrical pitch is 10 teeth/in, the face width is 1.5 in, and the set has a..
a pressure transducer exhibits a temperature sensitivity of 0.05 units per degree celsius and a pressure sensitivity of
Consider horizontal pipe carrying water at 70 °F. It is given that the pressure drop over a 100-ft length of 1-in-diameter is 5.0 psig. Determine (a) the Reynolds number, (b) the friction factor, and (c) the flow rate of the water?
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