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A heat pump is under consideration for heating a research station located on an Antarctica ice shelf. The interior of the station is to be kept at 158C. Determine the maximum theoretical rate of heating provided by a heat pump, in kW per kW of power input, in each of two cases: The role of the cold reservoir is played by (a) the atmosphere at 2208C, (b) ocean water at 58C.
An automobile weighing 2500 lbf increases its gravitational potential energy by 2.25x10^4 Btu in going from an elevation of 5183 ft in Denver to the highest elevation on Trail Ridge Road in the Rocky Mountains. What is the elevation at the high point..
a compressed air cylinder initially contains air at 25ordmc and 100 kpa. the volume of the cylinder is 0.01021 m3. the
the field-circuit resistance and armature-circuit resistance of a 10-hp 115-v motor are 90 ohms and 0.08 ohms
a rigid tank contains an ideal gas at 40u2070c that is being stirred by a paddle wheel. the paddle wheel does 200 kj of
A section of a composite wall with the dimensions shown below has uniform temperatures of 200°C and 50°C over the left and right surfaces, respectively. If the thermal conductivities of the wall materials are: kA = 70 W/(m K), kB = 60 W/(m K), kc ..
Thermocouples inserted in the bar are used to measure temperatures at distances of x 1 = 10 mm and x 2 = 25 mm from the surface.
a devise take 5 kgs of water at a pressure of 300 kpa and a temp of 180 degrees c. the water exists the devise at the
A steam turbine is operating at a steady state with a mass flow rate of 3682 kg/h at the inlet. The power output of the turbine is 8700 kW. Steam enters the turbine at a pressure of 40 bar, temperature of 320 oC, and with a velocity of 13 m/s. The ex..
a six cylinder diesel engine with a 4.5 inch. bore for each cylinder and 5.0 inches stroke works on a theoretical
steam at 160 bar 480degc enters a two-stage turbine operating at steady sate with a volumetricnbspflow rate of 800
consider an r-134a compressor on a refrigeration system. if the refrigerant enters as saturated vapor at 200 kpa 0.03
A meteorologist uses a pitot -static tube to measure the wind speed in a tornado. Based on the damage caused by the storm, the tornado is rated as EF5 on the enhanced Fujita Scale. This means that the wind speed is estimated to be in the range of 261..
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