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An air conditioner can produce a 120 kJ/min cooling effect while rejecting 2.5kW of heat. What is its COP and the electricity it consumes? An inventor claims to have designed a system which can produce the same cooling rate but consumes only 0.05kW electricity to maintain a house temperature of 18degreeC when the outdoor temperature is 30degreeC. Is it an innovative design or a false design? R-134a enters the condenser of a refrigerator at 800kPa and 50degreeC at a rate of 0.018kg/s and leaves at 800kPa as a saturated liquid. It is known that the compressor consumes 1.2kW of electricity at this operating condition. Determine 1) heat rejection rate to the surrounding; 2) cooling rate; and 3) the COP of the refrigerator.
a component is fabricated from an aluminum alloy that has a plane strain fracture toughness of 43 mpa-m-12. during
If we have |N|(en) + F - W = 0 Where The unit vector of N is give, F components unknown and W is only -3400 j. What is the first step to solve for an unknown.
a pure aluminum conical section with cross sectional diameter of d ax12. a 0.5meters12. the small end of the cone is
Steam enters a diffuser at and with a velocity of and exits as saturated vapor at 240 F and 100 ft/s. The exit area of the diffuser is 1 ft2. Determine the mass flow rate of steam and the rate of entropy generation.
What will be the length of the specimen after the load is removed? d) The specimen was reloaded until fracture. If the % reduction in area after fracture was 40%, what is the minimum diameter of the specimen at fracture?
if the weight of a loaded truck is described by a normal distribution with a mean of 13.2 tons and a standard deviation
the drinking water needs of a residential hall with 20 students is to be met by a bubbler type water fountain. the
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
an insulated vertical piston-cylinder device initially contains 10 kg of water 8 kg of which is in the vapor phase. the
Mainframe computing used to be the only way to manage enterprise data. Then personal computers changed the data management scene. How do these two computing styles differ, and how did shift to PC-based computing evolve.
Use the bisection method to determine the drag coefficient (cd) needed so that a 80 kg bunjee jumper has a velocity of 36 m/s after 4 s of free fall.
a projectile is launched from the ground with v0100fts at t0 theta060 degrees. determine the time t when the velocity
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