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The rate of heat loss Q . loss through a window or wall is a function of the temperature difference between inside and outside ? T, the window surface area A, and the R value of the window, which has units of (ft2 . h . °F)/ Btu. (a) Using the Buckingham Pi Theorem, find an expression for rate of heat loss as a function of the other three parameters in the problem. (b) If the temperature difference ? T doubles, by what factor does the rate of heat loss increase?
Water flows downward through a vertical smooth pipe (i.e., roughness = 0). When the flow rate is 0.5 ft3/s, there is no pressure change along the length of the pipe. What is the pipe diameter?
helium gas in an ideal otto cycle is compressed from 12degc and 2 l to 0.25 l and its temperature increases by an
A block weighing 80 N is resting on a plane inclined 20 degree to the horizontal. The coefficient of static friction is 0.5. Determine the friction force on the block. What is the maximum available friction force?
An adiabatic heat exchanger is used to heat cold water at 8°C entering at a rate of 3 kg/s using hot air at 150°C entering with the same mass flow rate. If the air’s exit temperature air is 30°C,
a 1000 mw coal fired power plant operates with an annual plant capacity factor equal to 75. the plant burns coal which
Consider a 100-mm-thick plate (k = 45 W/m · K. p = 7800 kg/m3 · cp = 500J/kg · K) that is initially at a uniform temperature of 300°C and is heated (on both sides) in a gas-fired furnace for which T8 = 700°C and h = 500 W/m2 · K. How long will it ..
The train engine on the left, A, is at rest, and the one on the right, B, is coasting to the left. If the engines are identical, use numerical values to show how to determine the maximum compression in each of the spring bumpers that are mounted in t..
cooling water enters a cooling tower at a rate of 1000 kgh and 70 degree c. water is pumped from the base of the lower
standard atmospheric air at stagnation conditions t0 59 degree f p0 14.7 psia is drawn steadily through a
A flywheel, with a weight of 100 lb and an eccentricity of 0.5 in., is mounted at the center of a steel shaft of diameter 1 in.
at the beginning of the compression process of an air-standard diesel cycle operating with the compression ratio r 18
A liquid/vapor H2O mixture with 9.1 lb-m and a pressure of 1000 psia is heated at constant pressure until the temp is 600ºF. What is the final total enthalpy of the water, in BTUs?
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