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A PV battery system has an end-to-end efficiency of 77%. The system is used to run an all-AC load that is run only at night. The charge controller efficiency is 96% and the inverter efficiency is 85%. How much energy will need to be gathered by the PV array if the load is 120 watts running for 4 hours per night?
at steady state a refrigeration cycle maintains a freezer at -2degc removing energy by heat transfer from the food
What is the primary difference between the strength of a structure and the strength of a material? Is a strong material stiff?
Water is pumped from a lower reservoir to a higher reservoir by a pump that provides 23kW of shaft power. The free surface of the upper reservoir is 46m higher than that of the lower reservoir. If the flow rater of water is measured to be 0.03m^3/s d..
in the following experiment a constant-pressure calorimeter containing 100 ml of h20 is used.the initial temperature of
40-m long section of a horizontal steam pipe of 6-cm in outside diameter has a surface temperature of 170c and
a refrigerant 134a at 140 kpa and -10 degree celcius is compressed by an adiabatic 16kw compressor to an exit state of
a steam turbine receives steam at 110 fts velocity and 1525 btuibm enthalpy. the steam leaves at 810 fts and 1300
calculate the hourly gas flow rate for the conditions given as followsreadings differential pressure 50-in water static
Compute the first energy level (in eV) for a particle trapped in a 0.1 nm region. Assume the mass of the particle is equal to 0.511 MeV/c^2
a six-cylinder four-stroke internal combustion engine with compression ratio of 17 and displacement volume of 4.5 l is
the rotation of rod oa about o is defined by the relation theta t3 - 4t where theta and t are expressed in radians and
Metal balls 10 mm in diameter are to be annealed by heating them to 827°C then allowing them to cool slowly in air at 27°C to the point where they are in thermal equilibrium with the air. 2000 balls are annealed in one hour’s time. What is the total..
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