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Derive a relation for the COP of the two-stage refrigeration system with a flash chamber as shown in Fig. 11-12 in terms of the enthalpies and the quality at state 6. Consider a unit mass in the condenser.
$25,000 is deposited in a savings account that pays 10% interest, compounded monthly. Equal annual withdrawls are to be made from the account, beginning one year from now and countinuing forever.
A high-strength steel simply supported W24 X 76 beam carries a uniformly distributed load over its entire length of 25 ft. (a) If the allowable stress is 33 ksi, what may be the value of the load, in addition to the beam's own weight
A pump of 80% efficiency lifts water from one large open tank to another; the difference in water surface elevations is 20 feet. The pipe is relatively smooth (f = 0.0122), and has 3 elbows, each with a loss coefficient of 2/3.
Consider again the proposed water treatment plant for a city of 100,000 people where the maximum daily water usage rate is 99 X 106 L/d. Determine
The ¼" thick 6061?T6 aluminum bar is subjected to a tensile force of P = 5 kips. b = 4"; c = 1.5"; d = 2.5"; and the fillet radii are 1". a) Determine the maximum stress in the bar. b) What is the lateral strain in the 1.5" wide section
If the front edge of a contaminant plume is perfectly straight, how long would it take to travel to Well 1 after first arriving (simultaneously) at Wells 2 and 3, assuming that the contaminant plume travels only half as fast as the groundwater flo..
The following data were obtained for a plate-and-frame filter of total area A=500 sq cm. operating under a constant pressuredrop of 0.1 atm: Time t (min): 50 75 100 Volume of filtrate V (liter): 9.7 12.3 14.0 The filtrate is essentially water.
The New Jersey Surety Association, in various documented publications discusses the Surety’s relationship with their clients, the best ways to better know your Surety and a brief overview of why the Construction Business can fail.
Draw the influence line for the shear in panel CD of the girder. Determine the maximum negative live shear in panel CD due to a uniform live load of 500 lb/ft action on the top beams.
Two steel rods with fixed supports at A and C are attached by a rigid flange at point B and a downward load of 120 kN is applied to the flange. The upper rod has a cross section of 800 mm^2 and the lower rod has
The initial conditions of the helium are 7 ft^3, 80 psia, and 100 F. The helium expands reversibly according to process PV^1.5=C until the pressure reaches 15 pisa.
While designing a shock absorbing bumper for a 5-Mg rail car, the spring used for the bumper follows a nonlinear relationship of F = ks2 where F is the force in Newtons and s is the compression distance in meters.
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