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(a) An inventor claims to have developed a refrigeration unit with a COP of 8.5 which maintains the refrigerated space at -10oC while operating in a room where the temperature is 25oC. Can this claim be correct?
(b) Consider an engine in outer space which operates on the Carnot cycle. The only way in which heat can be transferred from the engine is by radiation. The rate at which the heat is radiated is proportional to the fourth power of the absolute temperature and to the area of the radiating surface. Show that for a given power output and a given TH, the area of the radiator will be a minimum when TL/TH = ¾.
a 0.5m3 rigid tank contains refirgerant r-134a initially at 200 kpa and 40 quality. heat is now transferred untill the
a steel bearing is known to have a true diameter of 0.4982 in. in the laboratory you use a micrometer that is supposed
Carbon-dioxide gas at 3MPa and 500 K flows steadily in a pipe at a rate of 0.4kmol/s. Determine a) the volume and mass flow rates and the density of carbon dioxide at this state. If CO2 is cooled at a constant pressure as it flows in the pipe so that..
a wall is composed of a 12-cm-thick layer of material a and a 20-cm-thick layer of material b. the temperature of the
What is the kinetic energy (in Btu) associated with a 300 gm hockey puck flying at 120 mph? Assuming an ideal gas, calculate the specific volume in the appropriate units for (6 pts) : a. N 2 at 500 kPa and 900 K b. Neon at 8 kPa and 250 K c. Air at 1..
a house that was heated by electric resistance heaters consumed 1200 kwh of electric energy in a winter month. if this
Trying to find a solution for problem 2.33 in Fundamentals of Heat and Mass Transfer, seventh edition.
a bug is on the rimof a disk of diameter 13 in that moves from rest to an angular speed of 70 revmin in 5.2 s.what is
his choice of route is independent of the weather. if it rains the probabilities of arriving late through route a b and
assume that all electrical energy consumed by a household is generated by burning fossil fuels and that the resulting
water cp 4182 jkg.k at a flow rate of 5000 kghr is heated from 10 c to 35 c in an oil cooler by engine oil cp 2072
a rigid tank whose volume is 0.5 m3 initially containing ammonia at 20oc 1.5 bar is connected by a valve to a large
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