Effect of delay in thermal systems with long ducts

被引：10

作者：

Díaz, G ^{[1
]}

Sen, M ^{[1
]}

Yang, KT ^{[1
]}

机构：

[1] Univ Notre Dame, Dept Aerosp & Mech Engn, Notre Dame, IN 46556 USA

来源：

INTERNATIONAL JOURNAL OF THERMAL SCIENCES | 2004年 / 43卷 / 03期

关键词：

delay equations; thermal control; delay in loops; delay in branches; thermal oscillations;

D O I：

10.1016/j.ijthermalsci.2003.07.004

中图分类号：

O414.1 [热力学];

学科分类号：

摘要：

We analyze simple, one-dimensional models of thermal systems with long ducts in which there is a delay due to the time it takes the fluid to travel along the duct. A general solution of the dynamic problem of a single duct with time-dependent inlet and ambient temperatures is obtained, and several special cases are described in detail. Of particular interest is the periodic case in which the inlet and ambient temperatures are sinusoidal in time. Also presented is a model that includes the effect of thermal inertia of a heater located at the entrance to a duct for which the time-dependent temperature fields for periodic heating are calculated. Periodic behavior in closed loops and open loops with branching are also discussed. (C) 2003 Elsevier SAS. All rights reserved.

引用

页码：249 / 254

页数：6

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