Ask Question, Ask an Expert

+1-415-315-9853

info@mywordsolution.com

Ask Civil Engineering Expert

problem 1: 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.

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.

problem 2
: 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?

problem 3: 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?

problem 4: A customer requested the design of a Heat Exchanger and provided the following information to the Engineering Department. In his factory, as part of the process upgrade, there is a need to heat 97.2 m3/hr of cold water from 32oC to 60oC. The heat is available from 100.8 m3/hr of hot water at 90oC. The customer does not know of any other information that could lead to a final configuration of heat exchanger type. In this initial stage, he requires a preliminary design that can be evaluated to determine what additional requirements should be considered.

In a meeting conducted at the Engineering Department, it was decided to:

a) Design the Heat Exchanger with the information provided. In this stage, all assumptions must be listed and describeed for customer evaluation and review.

b) Prepare Heat Exchanger drawings of the proposed solution/s.

c) At the same time, the design must be evaluated to identify features and configurations that could be discussed with the customer with the aim of developing more complete specifications.

d) Cost analysis in not required.

Civil Engineering, Engineering

  • Category:- Civil Engineering
  • Reference No.:- M91949

Have any Question? 


Related Questions in Civil Engineering

Logic functiona using suitable values for valid logic

Logic function: A. Using suitable values for valid logic levels and noise margins, what logic function does the device with the above transfer characteristic compute? Assume the convention of positive logic. B. What func ...

Consider the gain plot in figure p12-68a find the transfer

Consider the gain plot in Figure P12-68. (a) Find the transfer function corresponding to the straightline gain plot. (b) Use MATLAB to plot the Bode magnitude of the transfer function. (c) Design a circuit that will real ...

We have two categories of vectors category i consists

We have two categories of vectors. Category I consists of Category II consists of We want to train a single-neuron ADALINE network without a bias to recognize these categories (t = 1 for Category I and t = -1 for Categor ...

Ben bitdiddle is exploring finite-state machines of the

Ben Bitdiddle is exploring finite-state machines of the following form: A. Draw a state-transition diagram for the FS . Assume that you start in the state Q0 = 0, output = 1. B. Assume that you start in the state Q0 = 0, ...

Regarding the calculation of stresses in wood structural

Regarding the calculation of stresses in wood structural panels, a. What is the effective section modulus KS, and when is it used? b. What is shear through the thickness? c. What is rolling shear?

Manchester encoding can be used to transmit a stream of

Manchester encoding can be used to transmit a stream of bits over a single data wire, with no auxiliary clock information. Each bit is represented by one of the following patterns, where T is the period of the clock used ...

Consider a single-input neuron with a bias we would like

Consider a single-input neuron with a bias. We would like the output to be -1 for inputs less than 3 and +1 for inputs greater than or equal to 3. i. What kind of a transfer function is required? ii. What bias would you ...

As in the application of radiation shields discussed in

As in the application of radiation shields discussed in Section 4.4.5, there are applications where the surface-radiation through multiple (thin, opaque solid) layers (or solid slabs) is of interest. This is rendered in ...

The figure shows a schematic of a torsion-bar suspension

The figure shows a schematic of a torsion-bar suspension for an auto mobile (the torsion bar appears in cross section at A). If the three forces and the couple C = 900 lb · ft are equivalent to a upward vertical force R ...

The force acting at a is f 10i 20j - 5k kn knowing that

The force acting at A is F = 10i + 20j - 5k kN. Knowing that the moment of this force about the y-axis is 8j kN · m, determine the distance b and the moment of F about point O.

  • 4,153,160 Questions Asked
  • 13,132 Experts
  • 2,558,936 Questions Answered

Ask Experts for help!!

Looking for Assignment Help?

Start excelling in your Courses, Get help with Assignment

Write us your full requirement for evaluation and you will receive response within 20 minutes turnaround time.

Ask Now Help with Problems, Get a Best Answer

Section onea in an atwood machine suppose two objects of

SECTION ONE (a) In an Atwood Machine, suppose two objects of unequal mass are hung vertically over a frictionless

Part 1you work in hr for a company that operates a factory

Part 1: You work in HR for a company that operates a factory manufacturing fiberglass. There are several hundred empl

Details on advanced accounting paperthis paper is intended

DETAILS ON ADVANCED ACCOUNTING PAPER This paper is intended for students to apply the theoretical knowledge around ac

Create a provider database and related reports and queries

Create a provider database and related reports and queries to capture contact information for potential PC component pro

Describe what you learned about the impact of economic

Describe what you learned about the impact of economic, social, and demographic trends affecting the US labor environmen