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Providing domestic hot water to a household typically requires 107 kJ of energy per year. A typical electric water heater has an efficiency (heat supplied to water/work input) of 90%, while a heat pump-powered water heater has better performance but is more expensive. The water must be heated to 50 degree C and a heat pump would draw heat from the ground at 7 degree C. Assume electricity costs $0.08/kWh. Determine the minimum annual operating cost of a heat pump-powered water heater Assume that a heat pump-powered system has an actual coefficient of performance of 2.5 and costs $ 1000 more than the electric water heater. How many years would it take for the actual heat-pump system to pay off?
Find the differential equation governing the motion of the diver while she is in contact with the board. Neglect any rotational inertia and what is the peak de?ection of the diving board?
determine the slenderness ratio of a 5 m column with built end if its cross section is a circular with a radius of 40 mm and b 50 mm square use the concept of effective length.
the u velocity component of a steady two dimensional incompressible flow field is u 4x 3y 1. velocity component v is
air is contained in a vertical cylinder fitted with a frictionless piston and a set of stops. the atmospheric pressure
saturated water vapor at 300 degrees f enters a compressor operating at steady state with a mass flow rate of 5 lbs and
compressive centric forces of 30 kips are applied at both ends of the assembly shown by means of rigid end plates.
Principles of Engineering Economic Analysis-Time value of money-use of gradient factor is expected
a solid cube of wood having dimensions of 0.5 m3 is floating in water with 0.3 m of its dimension above the surface.
the rotation of rod oa about o is defined by the relation ? 0.5e -0.8tsin3pt where ? and t are expressed in radians and
liquid water is contained in an insulated rigid container. an electrical resistance heater is inside the device is
a 25-hp 240-v 77.8-a shunt motor has an armature resstence of 0.083 ohms and a field-circuit resistance of 125 ohms.
how to determine the equilibrium concentrations of h2 oh and h2o when water is heated to 1000 3000 5000k. what if the
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