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When the outside temperature is -10°C, a residential heat pump must provide 3.5 x 106 kJ per day to a dwelling to maintain its temperature at 20°C. If electricity costs 8 cents per kWh, determine the minimum theoretical operating cost for each day of operation.
carbon dioxide enters an adiabatic compressor at 100 kpa and 300 k actual inlet conditions at a rate of 0.5 kgs and
A refrigerant is compressed in the compression cylinder of a refrigerator from p1 = 112 psi, V1 = 13.0 in3 to p2 = 424 psi, V2 = 3.0 in3. Determine a value of n such that the data are fit by an equation of the form pV n = constant. Hint: You can take..
a steel rod with a diameter of 0.625 is loaded in tension with 12000 lb load. in the unloaded condition the rod is 240
the heat input to a cold box is to be reduced by adding extruded polystyrene sheets p55kg m-3 k0.027w m-1 k-1
the bending moment at a point in a beam of elastic modulus e is m. determine the ration of the maximum stress for a
assuming the ball experiences a downward acceleration of a10-0.9v2 when in the water determine the velocity of the ball
in cooling situations where the desired temperature range is large two refrigeration cycles can be stacked to create a
design a combinational circcuit with three inputs x y and z and three outputs a b and c. when the binary input is 0 1 2
a gas-turbine power plant operates on the simple brayton cycle between the pressure limits of 100 and 800 kpa. air
Water enters the pump of a steam power plant as saturated liquit at 20kpa at a rate of 45kg/s and exits at 6mpa. Neglecting KE and PE changes and assuming the process is reversible, determine the power input of the pump
point a of the rolling disk is moving toward the right and accelerating toward the right. the magnitude of the velocity
air in a piston cylinder assembly undergoes a thermodynamic cycle consisting of three internally reversible processes
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