System dynamics model and startup behavior of loop heat pipe
Resource
Applied Thermal Engineering,29,2999-3005
Journal
Applied Thermal Engineering
Pages
2999-3005
Date Issued
2009-08
Date
2009-08
Author(s)
Abstract
The purpose of this article is to study the system dynamics model and startup behavior of loop heat pipe. A mathematical model in normal operation was derived from the experimental data. The model is presented as a matrix of second-order transfer functions. It is found that the system dynamics of a LHP is a variable-structure system that changes with operating conditions. The startup phenomena are studied experimentally. The startup phenomena of a LHP can be classified into four modes, based on the heat load: (1) failure mode: over(Q, ̇)in < over(Q, ̇)min, (2) oscillating mode: over(Q, ̇)min < over(Q, ̇)in < over(Q, ̇)crit, (3) overshoot mode: over(Q, ̇)crit < over(Q, ̇)in < over(Q, ̇)s, and (4) normal mode: over(Q, ̇)s < over(Q, ̇)in. For heat load over(Q, ̇)in < 40 W (over(Q, ̇)s), the overshoot phenomenon is observed. For 20 W (over(Q, ̇)crit) < over(Q, ̇)in < 40 W (over(Q, ̇)s), the oscillation phenomenon is observed. For over(Q, ̇)in < 5 W (over(Q, ̇)min), the startup failure is observed. All the startup behavior is of second- order. © 2009 Elsevier Ltd. All rights reserved.
Type
journal article
File(s)![Thumbnail Image]()
Loading...
Name
2009 LHP model and startup behavior.pdf
Size
1.16 MB
Format
Adobe PDF
Checksum
(MD5):8b8382a974a520e071b76b0e2a8921b9