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Repeat the previous problem, but assume that the cost of installation is to be repaid at 7% interest over 15 years and that the electricity costs escalate at 10% per year. Compare the NPV of the solar system in Problem 2.7 to that of an electric heating system over a 15 year period, then discuss whether or not the solar system is a good investment relative to the payback Time. Also prepare a spreadsheet showing the NPV for each year.
Problem 2.7
A rooftop solar hot water heater with collector areas of 8 m2 and storage of 640 L is installed in Phoenix, Arizona, on a house that uses 160 L/day of hot water at 60°C. Of the total energy required, 70% is supplied by solar energy (the solar fraction is 70%) and 30% is supplemented with an electric heater. The solar system costs $3000 for installation, whereas an electric water heater and tank for the same supply costs $800 for installation. Assuming that the electricity cost is $0.10/kWh and does not change over time, estimate the simple payback time for the solar hot water heater. The temperature of the water in the main from which it is to be heated is 10°C.
For the system in Problem 6.7, how many hours of sunlight are needed to ensure that the battery bank is at 100% charge at the end of the day assuming the same load?
A micro channel 10 µm tall, 50 µm wide, and 2 cm long is used for analysis of bradykinin, a small peptide with a molecular weight of 1.06 kDa (1 Da = 1 g/mol). What is the morality of the bradykinin sample (i.e. convert µg/mL to M)?
find: a) the pitch diameter of the pinion. b) the pitch diameter of the gear. c) the output torque of the gear. d) the minimum length of the key used to attach the gear?
Discuss three waste minimization strategies that could be used by a small business classified as a small quantity generator. Provide examples for each strategy. Your response must be at least 150 words in length.
a rigid well insulated container contains 10 kg of water. a motor connected to a paddle wheel is used to stir the water
an insualed piston-cylinder device contains 5 kg of satured mix of water initially at 100kpa and 6m3. now 3917kj of
A thin ring of radius a is charged so that a uniform line charge density of Pt C/m exists on the ring. Calculate the electric field intensity at a height h above the center of the ring, on its axis.
total power required to overcome viscous resistance and wave drag is 11.4 mw. use the perfomance characteristics of the
A flow rate of 50 ft3 /s falls within the range of both the 4-ft- and the 10-ft-wide Parshall flume. Compare the head H for this flow rate in each size.
The 2-kg rod ACB supports the two 4-kg disks at its ends. If both disks are given a clockwise angular velocity (vA)1 = (vB)1 = 5 rad>s while the rod is held stationary and then released, determine the angular velocity of the rod after both disks ha..
assume that a person is on a roof and that the structure has a circular cross section. if the interface is frictionless
A flow with a small viscosity but non-zero value may be treated as an inviscid flow if the velocity gradient is not very high. The drag is solely due to the friction between the flow stream and the surface of a body immersed in the fluid. In general,..
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