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The heat loss through the exterior walls ofa certain poultry processing plant is estimated to cost the owner $3,000 next year. A salesperson from
Superfiber Insulation, Inc., has told you, the plant engineer, that he can reduce the heat loss by 80% with the installation of $18,000 worth of Superfiber now. If the cost of heat loss rises by $200 per year (uniform gradient) after the next year and the owner plans to keep the present building for 15 more years, what would you recommend if the interest rate is 10% per year?
What are the design implications for the location and positioning of solar cells? Explain why the use of solar cells might be more appropriate in some regions of the country.
a 1.8-m3 rigid tank contains steam at 220degc. one third of the volume is in the liquid phase and the rest is in the
Consider an ideal Brayton cycle executed between the pressure limits of 1100kpa and 100kpa and temperature limits of 20 degrees Celsius and 1200 degrees Celsius with argon as the working fluid. Please find (1) the net work output of the cycle, (2) th..
A heat pump uses r134a as the refrigerant to keep a heated space at 20°c by pumping from a geothermal water source. Water from the geothermal source enters the evaporator (a heat exchanger) at 50°c and leaves at 40°c at a rate of 0.08 kg/s. The re..
a in a short section of a channel carrying a steady discharge of 36 m3s the depth is seen to increase from 1.6 m to
helium gas flows through a well-insulated nozzle at steady state. the temperature and velocity at the inlet are 550or
in a certain industrial dryer 4 kgh of water is to be removed from a moist material. the drying is accomplished by
the electric power needs of a community are to be met by windmills with 10-m-diameter rotors. the windmills are to be
steam enters the first turbine stage of a vapor power cycle with reheat and regeneration at 32 mpa 600degc and expands
A gas mixture at 675.0°C and 113 kPa absolute enters a heat exchanger at a rate of 69.0 m3/hr. The gas leaves the heat exchanger at 245.0°C. The change in enthalpy of the gas during the cooling process is -6.80 kJ/mol.
an elastic exercise band is grasped and then is stretched. knowing that the tension in portion de of the band is 70
a 6.44 kg steel ball is at a height of 8.12 meters above the floor traveling at a velocity of 4.69 ms and has an
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