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A heat pump operating at steady state provides 36,000 kJ/hr to maintain the temperature in a building at 22C. The heat pump operates with a coefficient of performance 75% that of a reversible cycle operating between the same thermal reservoirs. For each of the possible low temperature reservoirs below, determine the power required to run the heat pump and the daily cost if electricity costs $0.09/kW-hr.
a) outside air at -10C
b) a pond or lake at 5C
c) the ground at 13C
in a water heating system cold water at 5 c flowing at a rate of 5 kgs is mixed adiabatically with hot water at 80 c
water enters an insulated nozzle operating under steady conditions at a pressure of 60 psia a temperature of 350 degf
n-butane c4h10 is burned with 80 percent theoretical air and the products of combustion an equilibrium mixture
consider a roof of a house of thickness l 20 cm thermal conductivity k 1 wm k and emittance of the external surface
derive eulers equations of motions stating all your assumptions. a write down the equation in vector form and explain
Determine the stress that would result in a 1in schedule 40 steel pipe if a plumber applies a force of 70lb at the end of a wrench handle that is 16in long. What is the equation for torque? What is the value of T in this problem? Include units. What ..
An air-standard dual cycle has a compression ratio of 18.2 and a cut off ratio of 1.31. The pressure ratio during constant volume heat addition process is 1.5. At the beginning of the compression, P1=80 kPa, T1 = 20°C at the beginning of the cycle. U..
A living plant leaf is an open system that exchanges energy (sunlight and thermal flows) + matter (O2, CO2, water vapor, etc.) with the surroundings (the exterior). Even with irreversible processes (energy dissipation) we find that the net entropy ch..
a piston cylinder device contains 1 kg water at 20oc with a volume of 0.01 m3 by mistake someone locks the piston
Water flows at a rate of 20 l/s through a horz pipe dia .03 m. The pressure drop across the valve in the pipe is measured to be 2 kPa. Determine the irreversible head loss of the valve, and the useful pumping power needed to overcome the resulting..
two structural members b and c are bolted to a bracket a. knowing that both members are in tension and that p 6 kips
given that the average power plant produces 667 mw of electricity per year there are 492 coal plants in the us and a
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