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Jacob is considering the replacement of the heating system for his building. There are thre e alternatives. All are natural-gas-fired furnaces, but they vary in energ y efficiency. A'lodel A is leased at a cost of $500 per year over a 10-vear study period. There are installation charges of S500 and no salvage value. It is expected to provide energy savings of $200 per year. Model B is purchased for a total cost of $3600, including installation. It has a salvage value of Si000 after 10 years of service, and is expected to provide energy savings of S500 per year. Model C is also purchased, for a total cost of $8000, including installation. However, half of this cost is paid now, and the other half is paid at the end of two years. It has a salvage value of Si00 0 after 10 years, and is expected to provide energy savings of $1000 per year. For a ALARR of 12% and using a rate of return method, which heating system should be installed? One model must be chosen.
a wad of clay mass m1 with an initial horizontal velocity v1 hits and adheres to the massless rigid bar which supports
a 25 mm diameter uniform steel shaft is 600 mm long between bearings.a find the lowest critical speed of the shaftb if
a heat pump has a coefficient of performance of 2 using a power input of 2 kw. its low temperature is to and the high
Refrigerant 22 enters an insulated compressor operating at steady state as saturated vapor at - 16oC with a mass flow rate of 1.5 kg/s. Refrigerant exits at 7 bar, 70oC. Changes in KE and PE from inlet to exit can be ignored.
an oil well is drilled in the atlantic ocean where the water depth is 350 meters.a suppose methane gas forms a bubble
Estimate the percentage of the total heat flux to the sphere which results from radiation when the surface temperature of the sphere is 200°F, 400°F, and 600°F. Use the results of Sec. 7.9 to estimate the free-convection film heat transfer coeffic..
if a coal-burning electrical generating plant burns 2 tons of coal to generate 6000 kwh of electricity calculate the
Derive an expression for the electric energy generation per unit of air volume stored in a cavity for a CAES system. Assume that there are two expansion stages and express the work output as the sum of the output from the two stages. The system op..
The uniform 62-kg pole of 150-mm diameter is hinged at A, and its lower end is immersed in fresh water. Determine the tension T in the vertical cable required to maintain C at a depth of 1 m.
a piston- cylinder assembly with initial volume of 80 liters contains 4kg of r-134a at a pressure of 160 kpa state 1.
a rigid tank is divided into two equal parts by a partition. one part of the tank contains 3.1 kg of compressed liquid
the sun shines on a 500m2 road surface at 50c. below the 5cm thick asphault with an average conductivity of 0.1 wmk is
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