lab 4 - The University of Texas at Arlington Mechanical and...

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Unformatted text preview: The University of Texas at Arlington Mechanical and Aerospace Engineering Department Experiment Number 4 Concentric Tube Heat Exchanger Ronnie A. Mojzis & Michael Blackmon MAE 3183 Section # 002 Date performed October 26, 2004 Due Date November 3, 2004 ABSTRACT The concentric Tube Heat Exchanger experiment was created with the purpose to analyze the efficiency of a hot water heat exchanger with two different flow set-ups. The difference of efficiency was determined after the data from the two different flow patternsparallel flow and counter flow, was analyzed. The concentric tube heat exchanger consists of two tubes that are concentrically arranged. One of the fluid (either hot or cold fluid) flows through the tube and the other through the annulus. For a CTHX, two types of flow arrangements are possible - co-current and counter-current flow. In the parallel or co-current arrangement, the flow direction of the hot fluid will be the same as that of the cold fluid. In the counter-current arrangement, the flow directions of the hot and the cold fluids are opposite to each other. Water was pumped through a series of piping were a set of valves could be adjusted to accommodate for the flow directions. The volumetric flow rates used during the experiment were calculated from the differential pressures from the two venturi flow meters. The water pumped from the hot water reservoir was heated by an electrical element, the flow was directed to the inlet of the heat exchanger where the inlet temperature was measured using an RTD. After the hot water was introduced to the heat exchanger section, another flow of water was pumped through a different set of piping arrangement. The two flows were never mixed but the surface of the pipes that carried the fluid was in contact with one another, this is where conductive and connective heat transfer took place. The results of the experiment show that the counter flow set-up transferred heat more efficiently than the parallel flow arrangement. These efficiencies were derived from heat transfer equations and thermodynamic principles, using same volumetric flow rates on both scenarios. INTRODUCTION Heat is a form of energy that flows due to difference in temperature between two points that are located within a medium or in two different media. The transfer of heat occurs via one or any combination of the three modes of heat transfer - conduction, convection and radiation. Generally, the radiation heat transfer is of little importance for heat exchangers operating at low temperatures. Thus, the discussion will be limited to convective and conductive heat transfers. A heat exchanger is a device that efficiently transfers heat from a warmer fluid to a colder fluid. A device we are probably all familiar with is the automobile radiator. Other applications for heat exchangers are found in heating and air conditioning systems. Heat exchangers are categorized in many ways, but the two most common practices are, by the method of construction, and by the flow...
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lab 4 - The University of Texas at Arlington Mechanical and...

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