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Evaluation of the Transient Countercurrent Double Pipe Heat Exchanger with
Variable Specific Heat Coefficient
Rehab Noor Mohammed Al-Kaby Babylon University / College of Engineering Mechanical Department
In this paper, the unsteady state heat transfer from countercurrent double pipe heat exchanger is presented. A finite difference technique is used to solve the unsteady countercurrent double pipe heat exchanger differential equations. The variable specific heat coefficient with temperature is taken in account during the present analysis. Three types of effectiveness are discussed here because the change of the internal energy for the cold, hot fluids and also for the pipe wall material is taken in account. The entropy generation number for the case study is studied and the variation of the entropy generation number with effectiveness and other parameter is examined. The effect of the time, Nc, Nh, Eh, Cr on the cold & hot fluid effectiveness are examined, the increasing of the Nc & Nh values will increase the hot fluid effectiveness & in same time decrease the cold fluid effectiveness & also the increasing of the Cr will increase the hot fluid effectiveness and the entropy generation number. Our analysis is considering hot fluid (that we need to cool it) flow inside the tube & the cold fluid flows inside the annulus area
- وصف الــ Tags لهذا الموضوع
- Transient,Countercurrent,Double Pipe ,Heat Exchanger,Specific Heat Coefficient
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