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At steady state, a heat pump driven by an electric motor maintains the interior of a building at Th=293 K. The rate of heat transfer, in kJ/h, from the building through its walls and roof is given by 8000 (Th-Tc), where Tc is the outdoor temperature. Plot the minimum theoretical electric power, in kW, required to drive the heat pump versus Tc ranging from 273 K to 293 K.
consider flow of water over a flat plate of length 5 m. on one graph plot the both the drag caused by shear stress and
Estimate the number of pounds of mercury it would take to fill your bathtub. List all assumptions and calculations also determine the same, using glycerin.
Consider a NACA 0009 airfoil that has a plain flap whose length is 0.2c and which is deflected 25. a. Calculate cl and cmc/4 When the geometric angle of attack is 4 degrees, what is the section lift coefficient? Where is the center of pressure?
air enters the compressor of a regenerative gas-turbine engine at 300k and 100 kpa where it is compressed to 800 kpa
r-134a is throttled from 1200kpa and 40oc to 200kpa. it is known that heat of 5kjkg is lost from r-134a to the
two pipes are connected together in series. the diameter of one pipe is twice the diameter of the second pipe. with
in an air-standard brayton cycle air enters the compressor at 1000 lbmhr 14.7 psia and 40degf and exits at 70 psig. the
A 400 L rigid tank contains 5 kg of air at 25 degrees C. Determine the reading of the pressure gauge if the atmospheric pressure is 97 kPa.
steam enters an adiabatic turbine at pressure 6 mpa temperature 600oc and velocity 80 ms and leaves at pressure 50
a car travels along a road which for a short distance is defined by r200theta ft where theta is in radians. if it
air at 5 bar and 177oc state 1 is expanded through a turbine to 1 bar and 27oc state2. the mass flow rate of air
a device with no moving parts provides a steady stream of chilled air at -25c and 1 bar. the feed to the device is
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