Browsing by Subject "heat exchange"

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Access status: Open Access ,
Wymiana ciepła między powietrzem a zimną wodą w rurociągu zabudowanym w ślepym wyrobisku
(Wydawnictwa AGH, 2005) Filek, Krzysztof; Mikołajczyk, Władysław
If we want to use a water diaphragm cooler of air in a dead-end heading, cold water must be brought into it through a pipeline. Heat capacity of such a cooler depends on the temperature of water supplied to it. Locating 7 a water pipeline in a heading, in which warm air flows, leads to an increase in the temperature of water in pipe and is higher at the inlet of a cooler than at the inlet of pipeline. This article presents equations of air enthalpy balance in the dead end heading (without water vapor condensation on the external surface of the pipe) and cold water flowing through an insulated pipeline to the cooler of air as well as equations describing heat flow through the side wall of a pipeline from air to water. A set of equations of air and water enthalpy was solved analytically, giving distributions of air and water temperatures along the heading and, later on, using the dependences describing heat transmission through the wall of a pipe. Both distributions of temperatures of internal and external sides of pipe in the heading and the distribution of elementary heat flow exchanged between air and water are given. A calculation example, whose solution – distributions of the values mentioned above along the heading are shown in the form of graphs, was presented. An increase in temperature of cold water in a pipeline was also presented.