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An electrical window air conditioner with a cooling capacity of of 8000 kJ/hr draws 6.00 amps of electrical current at 120 volts and maintains the cooled space at a constant 20 oC. The outdoor temperature is a constant 42 oC. The electricity price is $0.15/kwhr. Find the actual cycle coefficient of performance, the rate of waste heat rejection (kJ/hr) and electrical cost per hour. Repeat/Compare results for COP, waste heat rate (kJ/hr) and operating cost ($/hr) for a Carnot refrigeration cycle with the same cooling capacity.
earth is required to be excavated from borrow pits for building an embankment. the wet unit weight of undisturbed soil
A small droplet of liquid detergent, falling through air in a spray drying tower, has its diameter reduced as water evaporates from the surface. If we assume that the temperature of the liquid within the drop remains at 290 K and the dry air is at..
if 10m3 of hydrogen at 0.4 mpa and room temperature is adiabatically mixed with 20m3 of nitrogen at 0.1 mpa and room
india has a land area of 2.97 x 106 km2 57 of which is cropland. if 5 of the cropland were dedicated to producing
water is to be pumped from a dam to a storage tank 20 m above at a rate of 70 ls. the electric power needed to achieve
p rtvct21 use maxwell relations to prove that the entropy of the system using this substance between states p1 and p2
a useful figure of merit comparison between batteries that have the same voltage is the ampere-hour ah rating. for
two m3 of xenonxe are contained in a closed rigid tank at 70 degree c and 2 bar. the tank is heated to a pressure of 10
a full-revolution press has 100 rpm flywheel rotation. the press is equipped with two-hand palm buttons mounted on the
A steel tape is used to measure a distance of 20 m at a 10 0C. Assuming that the tape will measure the true distance when the temperature is 20 0C. What would be the indicated distance at 10 0C? What would be the indicated distance at 400C?
nitrogen and hydrogen are mixed in a steady-flow adiabatic process in the ratio of 4kg of nitrogen per kg of hydrogen.
air at 1600 k 30 bar enters a turbine operating at steady state and expands adiabatically to the exit where the
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