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

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 Q 0 = 0, output = 1. B. Assume that you start in the state Q 0 = ...

1 water flows in a 5-in-diameter pipe at 20c with a mean

1. Water flows in a 5-in-diameter pipe at 20?C with a mean flow velocity of 3 m/s. A sharp-edged orifice with a diameter of 2.5 in is to be used to measure the flow rate. What pressure differential would be indicated for ...

A worker applies the forces p -10i 8j lb and q 10i lb to

A worker applies the forces P = -10i + 8j lb and Q = 10i lb to the handgrips of the electric drill. These forces are equivalent to the force R = 8j lb acting at the tip of the drill and the couple C R = -120j lb · in. De ...

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 Q 0 = 0, output = 1. B. Assume that you start in the state Q 0 = ...

Suppose we wish to measure the traffic at a point on a

Suppose we wish to measure the traffic at a point on a railroad track, counting the axle crossings in each direction. We set up a light beam just above the rails and place two photocells A and B some inches apart, as sho ...

An inflatable backyard swimming pool is being filled from a

An inflatable backyard swimming pool is being filled from a garden hose with a flowrate of 0.12 gal/s. a. If the pool is 8 ft in diameter, determine the time rate of change of the depth of water in the pool. b. Suppose t ...

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, ...

The airflow system in prob 760 is measured with a venturi

The airflow system in Prob. 7.60 is measured with a venturi having like dimensions as the orifice, i.e., the same pipe diameter and throat diameter. Calculate the flow rate in kg/s for the same pressure and temperature m ...

1 how are the species of wood used in the fabrication of

1. How are the species of wood used in the fabrication of plywood classified? 2. The plywood in Fig. 8A has a grade stamp that indicates Group 2. Find: a. What plies in the panel contain Group 2 species? b. If not all pl ...

The arm abcd of the industrial robot lies in a vertical

The arm ABCD of the industrial robot lies in a vertical plane that is inclined at 40? to the yz-plane. The arm CD makes an angle of 30? with the vertical. A socket wrench attached at point D applies a 52-lb · ft couple a ...

  • 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

WalMart Identification of theory and critical discussion

Drawing on the prescribed text and/or relevant academic literature, produce a paper which discusses the nature of group

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