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Compare the ideal COP of R-134a and R-22 at an evaporating temperature of 40 F and 20 F superheat and condensing temperature of 120 F with 15 F sub cooling with the actual compressor COPs calculated from the manufacturer's performance tables.
at steady state a heat pump maintains the interior of a house at 77f by transferring to it 30 kw of heat from the
A 50 hp motor with an efficiency of 0.80 is to be replaced by a newer model motor with an efficiency of 0.90. The motor is expected to operate 3000 hours per year. The cost of electricity in our area is $0.06 per kWhr.
consider a 1000-w iron whose base plate is made of 0.5-cm-thick aluminium alloy 2024-t6 p2771 kgm3 and cp 875 jkg c.
a car tire starts at rest and reaches a speed of 100 inches per minute and accomplishes this in 0.75 seconds. the
find the force required for the direct extrusion of commercially pure aluminum 1100-o billet 8 in in diameter into a
an fcc iron-carbon alloy initially containing .2 wt carbon is carburized at an elevated temperature and in an
a 3 kg piece of steel is removed from an oven at 700c and placed a water bath.the final temperature of the water is 80c
for the following given states find the reguired region i.e. phase or property of water.a given p 400kpa v 0.001084 m3
If the maximum temperature in the cycle is not to exceed 2200 K, determine the thermal efficiency and the mean effective pressure.
the thermal reservoirs for a carnot engine are two constant pressure steam lines one at th 300 c and one at tl of 25
a system that operates in a reversible cycle receives energy by heat transfer from a 24.8oc reservoir at a rate of 25.5
a 0.3 m3 rigid tank is filled with saturated liquid water at 200degc. a valve at the bottom of the tank is opened and
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