Technical Briefs

Steady State Performance of a Single Phase Natural Circulation Loop With End Heat Exchangers

[+] Author and Article Information
N. M. Rao1

 Rolta India Limited, Rolta Technology Park, MIDC, Andheri (E), Mumbai 400093, Maharashtra State, Indianmuralidhararao@yahoo.com

B. Maiti

Department of Mechanical Engineering, Indian Institute of Technology, Kharagpur 721302, West Bengal, Indiabmaiti@mech.iitkgp.ernet.in

P. K. Das

Department of Mechanical Engineering, Indian Institute of Technology, Kharagpur 721302, West Bengal, Indiapkd@mech.iitkgp.ernet.in


Corresponding author.

J. Heat Transfer 130(8), 084506 (Jun 10, 2008) (4 pages) doi:10.1115/1.2928015 History: Received March 19, 2007; Revised March 25, 2008; Published June 10, 2008

In the present investigation, the steady state performance of a rectangular single phase natural circulation loop (NCL) with end heat exchangers is studied. One-dimensional governing equations are considered in developing the mathematical model. Analytical expressions are derived for the circulation rate and temperature profile. However, the individual performance parameters are to be computed iteratively as the equations are strongly coupled. A suitable iterative procedure is given to evaluate the important loop parameters such as steady state flow rate, and riser and downcomer temperatures. Few special cases are discussed where analytical expressions for circulation rate and temperature distribution can be obtained directly without any iterative procedure. It is also shown that both the hot and cold end heat exchangers should have equal conductance (UA) for maximization of circulation rate. This feature of NCL is identical with heat power cycle and can be explained in light of equipartition principle.

Copyright © 2008 by American Society of Mechanical Engineers
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Grahic Jump Location
Figure 1

Optimum allocation of (UA)t*



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