Wednesday, 15 August 2018

HEAT TRANSFER ACE ACADEMY GATE STUDY MATERIAL PART-2 FREE DOWNLOAD PDF www.MechanicaLibrary.com

HEAT TRANSFER PART-2

ACE ACADEMY GATE STUDY MATERIAL

FREE DOWNLOAD PDF

MECHANICAL ENGINEERING

Heat Transfer Ace Academy GATE Study Material Part-2 Free Download PDF






ABOUT THE BOOK
  • SUBJECT : HEAT TRANSFER - THEORY WITH WORKED OUT EXAMPLES SELF AND CLASSROOM PRACTICE QUESTIONS
  • AUTHOR : SUBJECT EXPERTS OF ACE ENGINEERING ACADEMY - HYDERABAD
  • PUBLISHERS : ACE ENGINEERING PUBLISHERS
  • IDEAL FOR : GATE AND PSU's - MECHANICAL ENGINEERING STREAM

CONTENTS
  • Extended Surfaces FINS
  • Transient Heat Conduction
  • Radiation
  • Heat Exchangers

Heat Transfer Ace Academy GATE Study Material Part-2 Free Download PDF




HEAT EXCHANGERS

  • Heat exchangers is a broad term used in reference to devices designed for exchanging heat. Most often the heat is transferred from one fluid to another. 
  • A fluid that is discharged from a useful process might contain high energy, and it may be desired to recover some of the energy that would ordinarily be discarded. 
  • One example of this is in remotely located plants that generate their own electricity via steam turbines. Condensed steam that is still at a relatively high temperature might be routed through a small exchanger where it is used to heat water. 
  • A common example of a heat exchanger that dissipates unwanted energy is the radiator of a car. Heat exchangers can be classified in a number of ways, depending on their construction or on how the fluids move relative to each other through the device. 
  • A double-pipe heat exchanger consists of two concentric pipes or tubes. One fluid-the warmer one, for example-flows through the inner pipe. Another fluid flows through the annulus. Due to a temperature difference between the fluids, heat is transferred. The fluid streams (in the pipe and in the annulus) could be traveling in the same direction (pardlel jow) or in opposite directions (counterjow).




  • A shell-mid-tube exchanger consists of a huge outer cylinder (called the slzell) within which are contained many tubes. Generally, the shell and-tube exchanger can handle fluid-flow rates that are many times as large as those in a double-pipe exchanger.  
  • A crossflow eat exchanger is one in which the two fluid paths cross each other, usually at right angles. 
  • Common examples of crossflow exchangers include an automobile radiator, an oil cooler, and the coil and the evaporator of an air-conditioning system. 
  • It is interesting to note that all these devices have different names, but all perform the same function; moreover, any two of them could be identical  




DOUBLE-PIPE HEAT EXCHANGERS

  • It consists of one tube within another. One fluid flows through the inner tube. Another fluid flows through the annulus. Usually, common copper water tubing is used to construct the exchanger, although pipe and specialty tubing can also be used. 
  • Our objective in analyzing a double-pipe heat exchanger will be to predict its performance-the amount of heat transferred, the outlet temperature of one (or both) fluid stream(s), or the required area, depending on what is known. 
  • For an existing exchanger, the fluidflow rates, inlet and outlet temperatures, and physical data (diameters, etc.) are known or can be measured.


How to open this book : Download the ZIP file provided in the above download link, unzip the file. Password has been provided inside the ZIP file. Enter the password and open the book. Password applied intentionally for security purposes.


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