Effect of delay in thermal systems with long ducts

Autor:	Mihir Sen, Gerardo Diaz, Kwang-Tzu Yang
Rok vydání:	2004
Předmět:	geography Temperature control Materials science geography.geographical_feature_category General Engineering Open-loop controller Thermodynamics Mechanics Physics::Classical Physics Condensed Matter Physics Inlet Physics::Fluid Dynamics Dynamic problem Heat transfer Thermal Duct (flow) Closed loop
Zdroj:	International Journal of Thermal Sciences. 43:249-254
ISSN:	1290-0729
DOI:	10.1016/j.ijthermalsci.2003.07.004
Popis:	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.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::2c75d099df08e05b91621a0315827c51 https://doi.org/10.1016/j.ijthermalsci.2003.07.004 Zobrazit plný text záznamu Full Text from ScienceDirect