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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.
hot exhaust gases leaving an internal combustion engine at 400oc and 150 kpa at a rate of 0.8 kgs is to be used to
a cantilever beam ab is loaded by a couple m0 at its free end see gure. the length of the beam is l 20m and the
Air enters an adiabatic compressor at 0.1 kg/s, 100 kPa, 25 °C and exits at 700 kPa. (a) Draw a schematic of the system. Determine (b) the minimum power input (kW) and (c) the entropy generation rate (kW/K)
would it be a possible to use a normal domestic refrigerator as a heat source for a small hot tub or whirlpool? if so
1. Determine the change in the Gibbs function DG8 at 258C in kJ/kmol, for the reaction
you graduated from college after 4 long years and studying finally paid off you find a nice engineering job with a very
a four cylinder two stroke diesel engine has a cut-off ratio of 1.8 and a compression ratio of 22. it operates with an
you are designing a follower motion using modified trapezoid using scca family with b0.2 c0.5 d0.3. cam interval beta
Choose and estimate all the design characteristics of the motor, finally display all the power flow diagram results including efficiency and speed regulation of the motor. Give all assumptions taken.
A 0.03-lb bullet traveling at 1300 ft> s strikes the 10-lb wooden block and exits the other side at 50 ft> s as shown. Determine the speed of the block just after the bullet exits the block, and also determine how far the block slides before it..
the fracture strength of glass may be increased by etching away a thin surface e layer. it is believed that the etching
If the throat area is 7.6 3 1024 m2, and the exit plane pressure is 2.4 bar, determine the mass flow rate, in kg/s, and the exit area, in m2.
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