Engineering Mechanics: Statics & Dynamics (14th Edition)
14th Edition
ISBN: 9780133915426
Author: Russell C. Hibbeler
Publisher: PEARSON
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Chapter 11.7, Problem 44P
To determine
The weight
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Required information
Air at 25°C (cp=1006 J/kg.K) is to be heated to 58°C by hot oil at 80°C (cp = 2150 J/kg.K) in a cross-flow heat exchanger
with air mixed and oil unmixed. The product of heat transfer surface area and the overall heat transfer coefficient is 750
W/K and the mass flow rate of air is twice that of oil.
NOTE: This is a multi-part question. Once an answer is submitted, you will be unable to return to this part.
Air
Oil
80°C
Determine the effectiveness of the heat exchanger.
In an industrial facility, a counter-flow double-pipe heat exchanger uses superheated steam at a temperature of 155°C to
heat feed water at 30°C. The superheated steam experiences a temperature drop of 70°C as it exits the heat exchanger.
The water to be heated flows through the heat exchanger tube of negligible thickness at a constant rate of 3.47 kg/s. The
convective heat transfer coefficient on the superheated steam and water side is 850 W/m²K and 1250 W/m²K,
respectively. To account for the fouling due to chemical impurities that might be present in the feed water, assume
a fouling factor of 0.00015 m²-K/W for the water side.
The specific heat of water is determined at an average temperature of (30 +70)°C/2 = 50°C and is taken to be
J/kg.K.
Cp=
4181
Water
Steam
What would be the required heat exchanger area in case of parallel-flow arrangement?
The required heat exchanger area in case of parallel-flow arrangement is
1m².
A single-pass crossflow heat exchanger is used to cool jacket water (cp = 1.0 Btu/lbm.°F) of a diesel engine from 190°F to 140°F, using
air (Cp = 0.245 Btu/lbm.°F) at inlet temperature of 90°F. Both air flow and water flow are unmixed. If the water and air mass flow rates
are 85500 lbm/h and 400,000 lbm/h, respectively, determine the log mean temperature difference for this heat exchanger. Assume
the correction factor F to be 0.92.
Air flow
(unmixed)
Water flow
(unmixed)
The log mean temperature difference of the heat exchanger is
°F.
Chapter 11 Solutions
Engineering Mechanics: Statics & Dynamics (14th Edition)
Ch. 11.3 - Determine the required magnitude of force P to...Ch. 11.3 - Determine the magnitude of force P required to...Ch. 11.3 - The linkage is subjected to a force P = 2 kN....Ch. 11.3 - Prob. 4FPCh. 11.3 - Determine the angle where the 50-kg bar is in...Ch. 11.3 - Prob. 6FPCh. 11.3 - Use the method of virtual work to determine the...Ch. 11.3 - The scissors jack supports a load P. Determine the...Ch. 11.3 - If a force of P = 5 lb is applied to the handle of...Ch. 11.3 - Prob. 4P
Ch. 11.3 - Prob. 5PCh. 11.3 - Prob. 6PCh. 11.3 - When = 20, the 50-lb uniform block compresses the...Ch. 11.3 - Prob. 8PCh. 11.3 - The 4-ft members of the mechanism are pin...Ch. 11.3 - The thin rod of weight W rests against the smooth...Ch. 11.3 - If each of the three links of the mechanism have a...Ch. 11.3 - Prob. 12PCh. 11.3 - Prob. 13PCh. 11.3 - Prob. 14PCh. 11.3 - Prob. 15PCh. 11.3 - Prob. 16PCh. 11.3 - When = 30, the 25-kg uniform block compresses the...Ch. 11.3 - Prob. 18PCh. 11.3 - The Nuremberg scissors is subjected to a...Ch. 11.3 - The crankshaft is subjected to a torque of M = N ...Ch. 11.3 - Prob. 21PCh. 11.3 - The spring is unstretched when = 0. If P = 8 lb,...Ch. 11.3 - Prob. 23PCh. 11.3 - Prob. 24PCh. 11.3 - The dumpster has a weight W and a center of at...Ch. 11.7 - The potential energy of a one-degree-of-freedom...Ch. 11.7 - Prob. 27PCh. 11.7 - Prob. 28PCh. 11.7 - Prob. 29PCh. 11.7 - Prob. 30PCh. 11.7 - Prob. 31PCh. 11.7 - Prob. 32PCh. 11.7 - The uniform bar has a mass of 80 Kg. Determine the...Ch. 11.7 - The uniform bar AD has a mass of 20kg. If the...Ch. 11.7 - Prob. 35PCh. 11.7 - Prob. 36PCh. 11.7 - Determine me angle for equilibrium and...Ch. 11.7 - Prob. 38PCh. 11.7 - Prob. 39PCh. 11.7 - Prob. 40PCh. 11.7 - The uniform rod has a mass of 100 kg. If the...Ch. 11.7 - Prob. 42PCh. 11.7 - The buck has a mass of 20 Mg and a mass center at...Ch. 11.7 - Prob. 44PCh. 11.7 - Prob. 45PCh. 11.7 - Prob. 46PCh. 11.7 - Prob. 47PCh. 11.7 - Prob. 48PCh. 11.7 - Prob. 49PCh. 11.7 - Prob. 1RPCh. 11.7 - Prob. 2RPCh. 11.7 - The punch press consists of the ram R, connecting...Ch. 11.7 - Prob. 4RPCh. 11.7 - Prob. 5RPCh. 11.7 - Prob. 6RPCh. 11.7 - The uniform bar AB weighs 100 lb. If both spring...Ch. 11.7 - The spring attached to the mechanism has an...
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