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In 1775, Dr. William Cullen made ice in Scotland by evacuating the air in a water tank. Explain how that device works, and discuss how the process can be made more efficient.
solve using the ideal-gas law the generalized compressibility factor and steam tables. compare the specific volume of
a heat pump that operates on the ideal vapor compression cycle with refrigerant - 134a is used to heat a house. the
a concrete slab measuring 0.3m x 4m x 6m initially at 298 k is exposed to the sun for several hours after which its
the system is released from rest in the position shown. the masses of the collar a and the box b are ma 90 kg and mb
1. Calculate the Log Mean Temperature Difference, 2. Adjust the LMTD for a counter flow, one shell pass, two tube pass heat exchanger Tube side, 1. Calculate the tube wall thickness required for internal pressure and compare to the actual thickness
Consider three spherical rocks having diameter of 10 cm (A), 20 cm (B), and 40 cm (C). The densities of these rocks are given to be 2,500 kg/m3. They were left to free-fall above a water stream having a uniform velocity profile (um=0.1 m/s). The stre..
structure of body- centered cubic bcc crystal.a. the body-center atom in a conventional bcc unit cell has
A cylindrical electric resistance heater has a diameter of 1cm and length of 0.25m. When water at 30oC flows across the heater a heat-transfer coefficient of 15W/(m2oC) exists at the surface. If the electrical input to the heater is 5W, what is the s..
an aluminum pan whose thermal conductivity is 237 has a flat bottom whose diameter is 20 cm and thickness 0.4 cm. heat
a pressure measurement system has the following specifications range 0 to 1 kpa linearity error 0.05 fso hysteresis
the acceleration of a particle is defined by the relation akt2. a knowing that v-8fts when t0 and that v 8fts when t2s
a simply supported beam of length 18 ft. is subjected to a trapezoidally distributed load that has a value of 3 kipft
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