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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?
water specific heat 4.2 kjkg c at the rate of 120 kgmin is heated from 20 to 70 c by an oil having a specific heat of
a .5 inch solid bar is to be tested for its strength by applying a torsional force until the bar completely brakes in
in an automotive gas turbine the centrifugal compressor is driven at 40000 rpm by an axial turbine. the compressor
1 kg water in a piston cylinder device is initially at 250 degrees C and 300kpa (state 1) a total of 700 kj of work is done on the water in order to isothermally reduce its volume to 1/20 of its initial volume (state 2) determine the magnitude and th..
a full revolution has 100 rpm flywheel rotation. the press is equipped with two hand palm buttons mounted on the machine at a distance of 20 inches from the point of operation. How many engagement points on the flywheel would be necessary to make ..
liquid propane is commonly used as a fuel for heating homes powering vehicles such as forklifts and filling portable
a 3-diameter 5-long gas-piston assembly contains air at stp. stp standard temperature and pressure conditions 300k and
1. which has the larger area moment of inertia a 2 x 2 square beam of high strength stainless steel or a 2 x 2 square
a vehicle is powered by motors that have a maximum speed of 5000 rpm. each motor is coupled to the wheel using a gear
a cylinder subjected to internal pressure pi only is made of cast iron having ultimate tensile strengths in tension and
an airplane flies horizontally at 55.0 ms. its propellernbspdelivers 1500 n of thrust forward force to overcome
p8mpa and t500 degc and leaves at 40 kpa as saturated vapor. if the flow rate is 11.1 kgs and the power generated by
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