Determine the length of this heat exchanger, Physics

A concentric tube heat exchanger is comprised of a thin wall inner tube of 25.4 mm diameter and an outer tube of 47 mm diameter. The heat exchanger is used for cooling lubricating oil. The exchanger operates in counterflow, the inner tube carrying water and the outer tube carrying the oil with an overall heat transfer coefficient of 65 W/m2K. The following figure illustrates the heat exchanger. Properties of water are in Table A.6, oil properties in Table A.5.

a)  If the oil outlet temperature is 55oC, determine the total heat transfer and the water outlet temperature.

b)  Determine the length required for the tube heat exchanger.

A concentric tube heat exchanger, counterflow arrangement was designed to heat water from 20oC to 80oC using hot oil that is supplied to the annulus at 160oC and discharged at 140oC. The thin-walled inner tube has a 20 mm diameter. The overall heat transfer coefficient if 527 W/m2 K. The designed condition requested a total heat transfer rate of 3700 W.

 a) What  is the length of this heat exchanger?

 b) After 3 years of operation, the heat exchanger performance is degradated by fouling on the water side, and the water outlet temperature is 57oC for the same flow rate and inlet temperatures. What are the corresponding values of the heat transfer rate, the oil outlet temperature, the overall heat transfer coefficient, and the water side fouling factor, R"f,c?

A Shell-and-tube Heat Exchanger (1 shell pass, 2 tube passes) is to be used to condensate 3.21 kg/s of saturated steam at 350K. Condensation occurs on the outer tube surfaces, and the corresponding convection coefficient is 10,215 W/m2K. The temperature of the cooling water entering the tubes is 15oC. Thin-walled tubes of 20mm diameter are specified, and the mean velocity of water flow through the tubes is to be maintained at 0.45 m/s.

a) What  is the minimum number of tubes that should be used?

b) What  is the corresponding tube length per pass?

c) To reduced the size of the heat exchanger, it is proposed to increase the water side convection coefficient by inserting a wire mesh in the tubes. If the mesh increases the convection coefficient by 2, what is the required tube length per pass?

Posted Date: 2/15/2013 6:16:22 AM | Location : United States







Related Discussions:- Determine the length of this heat exchanger, Assignment Help, Ask Question on Determine the length of this heat exchanger, Get Answer, Expert's Help, Determine the length of this heat exchanger Discussions

Write discussion on Determine the length of this heat exchanger
Your posts are moderated
Related Questions
Making a sun-dial To withstand all weather, a sun-dial should be form of metal or painted wood. A cardboard model can be formed for easy experiments.  The gnomon which casts

Q. What are the uses of Raman spectrum? (i) It is widely utilized in almost all branches of science. (ii) Raman Spectra of dissimilar substances enable to classify them acc

Cosmic background radiation; primal glow The background of radiation typically in the frequency range 3 x 10 11 to 3 x 10 8 Hz discovered in space in the year of 1965. It is

The following data are measures of triceps skinfold thickness (X1), thigh circumference (X2), and midarm circumference (X3).  These three variables are used to predict percentage o

Define the formula of Wien law. WIEN'S LAW: λ m T = constant Here: λ m = Peak Wavelength (m) T = Surface Temperature (K) Constant = 2.898 x 10 -3 mK It

The drag on a 30-ft long, vertical, 1.25-ft diameter pole subjected to a 30 mph air wind is to be determined with a model study. It is expected that the drag is a function of the p

Discuss the Carnot cycle of operation and reduce the expression for efficiency. Carnot engine is works on the principle of Carnot cycle made up of four stages are represented as sh

A bicycle has tires of radius 0.35 meters. If the bicycle is traveling at a constant speed of 7.8 m/s, approximately what angular speed are the tires rotating? a) 85 rev/min b) 197

Within the elastic region (see the graph below), there exist a between the force applied and the change in the physical state of object. Experiments have shown that the elastic beh

What is the change in temperature of water after falling over a 50.0-m-tall waterfall? Suppose that the water is at rest just before falling off and just after it reaches the b