Stability analysis of heat exchanger dynamics

2009 ◽  
Author(s):  
Tiejun Zhang ◽  
John T. Wen ◽  
Juan Catano ◽  
Rongliang Zhou
Keyword(s):  
Stability Analysis ◽  
Heat Exchanger

Finite Element Analysis for the Stiffness and the Buckling of Corrugated Tubes in Heat Exchanger

2012 ◽  
Vol 468-471 ◽  
pp. 1675-1680 ◽  
Author(s):  
Xiao Jing Wang ◽  
Zhi Min Wang ◽  
Nian Wang
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Stability Analysis ◽  
Heat Exchanger ◽  
Heat Exchangers ◽  
External Pressure ◽  
Element Analysis ◽  
Value Analysis ◽  
Compressive Pressure ◽  
The Stability

Corrugated tubes in a heat exchanger are analyzed by using the FEA methods. And the formula how to compute single wave’s rigidity is obtained. Besides, methods of analyzing the stability of corrugated tubes under internal compressive pressure and external pressure are proposed which include characteristic value analysis and non-linear stability analysis, thus providing theory basis for the stability research of heat exchangers.

Stability Analysis and Optimization of By-Pass Controlled Heat Exchanger With Boiling

1976 ◽  
Vol 98 (2) ◽  
pp. 161-166 ◽  
Author(s):  
J. S. Ansari
Keyword(s):  
Mathematical Model ◽  
Optimal Control ◽  
Stability Analysis ◽  
Heat Exchanger ◽  
Flow Rate ◽  
Distributed Parameter ◽  
Final Temperature ◽  
Razumikhin Theorem ◽  
Sustained Oscillations ◽  
Intermediate Variables

A heat exchanger with boiling is considered. The final temperature of steam is controlled with the help of a controller which regulates the flow rate of by-pass water mixing with the outcoming steam. The simplest known mathematical model retaining the nonlinear and distributed parameter nature of the process is adopted. A known method of analysis, namely, Liapunov-Razumikhin theorem, is used to derive results on stability. An interesting feature of the system is that a positive feedback is required for stability. If the control is designed on the basis of minimization of the error in the final temperature alone, then the optimal control, requiring a negative feeedback, leads to sustained oscillations in the intermediate variables, even when the output is steady. The analysis, therefore suggests that meaningful optimization must take into account fluctuations in intermediate variables in addition to the error. A derivative control is shown to improve the transient response.

Stability Analysis of a Reduced Heat Exchanger Model

PAMM ◽  
2005 ◽  
Vol 5 (1) ◽  
pp. 805-806
Author(s):  
Michael Hanke ◽  
K. Henrik A. Olsson ◽  
Magnus Strömgren
Keyword(s):  
Stability Analysis ◽  
Heat Exchanger

Stability analysis of a degenerate hyperbolic system modelling a heat exchanger

2007 ◽  
Vol 74 (1) ◽  
pp. 8-19 ◽  
Author(s):  
Michael Hanke ◽  
K. Henrik ◽  
A. Olsson ◽  
Magnus Strömgren
Keyword(s):  
Stability Analysis ◽  
Heat Exchanger ◽  
Hyperbolic System ◽  
System Modelling

scholarly journals Stability Analysis of Uncertain Temperature control system with two additive delays and nonlinear perturbation

2017 ◽  
Vol 13 (10) ◽  
pp. 5927-5934
Author(s):  
Venkatachalam Veeraragavan ◽  
Prabhakaran Duraisamy ◽  
Thirumarimurugan Murugan ◽  
Ramakrishnan Krishnan
Keyword(s):  
Stability Analysis ◽  
Heat Exchanger ◽  
Temperature Control ◽  
Stability Criterion ◽  
Time Derivative ◽  
Temperature Control System ◽  
State Delays ◽  
Delay Dependent ◽  
Time Invariant ◽  
Delay Dependent Stability

In this paper, the problem of robust delay-dependent stability criterion is considered for a class of linear continuous time heat exchanger system with constant additive state-delays and bounded nonlinear perturbations using Lyapunov-Krasovskii (LK) functional approach.  In the proposed delay-dependent stability analysis, the time-delays are considered to be time-invariant.  In the proposed delay-dependent stability analysis, a candidate LK functional is considered, and take the time-derivative of the functional is bounded using the Jenson integral inequality.  The proposed stability analysis finally culminates into a stability criterion in LMI framework.  The effectiveness of the proposed stability criterion is illustrated using a network controlled temperature control of heat exchanger system

scholarly journals Stability Analysis of a Flow-Rate Controlled Heat Exchanger

1975 ◽  
Vol 11 (2) ◽  
pp. 239-244 ◽  
Author(s):  
Shinzo KITAMURA ◽  
Hideaki KANOH ◽  
Mitsuyoshi KOJYO ◽  
Shotaro NISHIMURA
Keyword(s):  
Stability Analysis ◽  
Heat Exchanger ◽  
Flow Rate ◽  
Rate Controlled

Multimode Fluid Elastic Instability of Heat Exchanger Tubes

2013 ◽  
Vol 136 (1) ◽  
Author(s):  
R. D. Blevins
Keyword(s):  
Stability Analysis ◽  
Heat Exchanger ◽  
Flow Velocity ◽  
Natural Frequencies ◽  
Cross Flow ◽  
Elastic Instability ◽  
Nonuniform Flow ◽  
Instability Analysis ◽  
The Stability

Multimode fluid elastic instability analysis is made of heat exchanger tubes in cross flow. The stability analysis predicts that the flow velocity for onset of tube instability in nonuniform flow is lowered by participation of multiple tube modes with similar natural frequencies.

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