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A cross-flow fin-and-tube heat exchanger uses hot water to heat air from 290 to 300 K. Water enters the heat exchanger at 340 K and exits at 310 K. If the total heat-transfer rate is to be 300 kW and the average heat-transfer coefficient between the water and the air is 50 W/m2 ·K, calculate the area of the heat exchanger required and the mass rate of air flow through the exchanger.
A refrigeration unit operating on R-134a is used to maintain a freezer at -15°C. The refrigeration unit operates at a suction pressure of 140kPa and a discharge pressure of 90
What is the effect on the current period income statement and the balance sheet when inventories are written down using the lower of cost or market method? What is the effec
If the same structural materials are used for the model and prototype, and the wind tunnel operates under standard atmospheric conditions, what is the required wind tunnel v
The convective rate of heat loss is given by Q = h A(T - Tf ), where h(W/m2 · ?C) is the convection coefficient, A is the surface area, and Tf is the temperature of the surrou
A pump is employed to deliver liquid water from a pond to a higher elevation. The pump steadily draws water from the pond at a volumetric flow rate of 192 gal/min through a pi
The dilute absorbed COz undergoes a first order reaction, k= 35 s-1 and Dae =1.5 x10-em2/s. The solubility of COz is 2.961 *10-7 kgmol/m3.Pa. The surface is exposed to the g
Determine the force in each member of the truss and state if the members are in tension or compression. Set P1 = 20 kN and P2 = 10 kN - Determine the force in each member of
In arriving at the equation describing the motion of a vibrating string, the weight was assumed to be negligible. Include the weight of the string in the derivation and dete
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