Design and Construction of a Double Pipe Heat Exchanger for Laboratory Application

Abstract

Engineering education is incomplete without laboratory practices. One of such laboratory equipment necessary for all engineering students to have hands-on in the course of their undergraduate studies is the heat exchanger. This work presents the detailed design and construction of a laboratory type double pipe heat exchanger that can be used both in the parallel and counter flow configuration. The heat exchanger was constructed using galvanized steel for both the tube and shell. Experiments were designed and carried out to test the performance of the heat exchangers. The heat exchanger performance characteristics (logarithm mean temperature difference (LMTD), heat transfer rate, effectiveness, and overall heat transfer coefficient) were obtained and compared for the two configurations. The LMTD tends to be relatively constant as the flow rate was increased for both the parallel and counter-flow configuration but with a higher value for the parallel flow configuration. The heat exchanger has a higher heat transfer rate, effectiveness, and overall heat transfer coefficient and therefore has more performance capability for the counter-flow configuration. The overall heat transfer coefficient increased as the flow rate increased for both configurations. Importantly, as a result of this project, Mechanical Engineering students can now have hands-on laboratory experience on how the double pipe heat exchanger works.

Diseño térmico-hidráulico de un intercambiador de calor de calor de doble tubo para el calentamiento de acetaldehído

“…Pueden conectarse para obtener un arreglo de flujo en paralelo con el fin de manejar elevados caudales tanto del fluido de trabajo como el servicio auxiliar (p. ej. vapor de agua), y encuentran su aplicación principal en sistemas continuos que presentan cargas de calor bajas y medias (Ebieto et al, 2020).…”

“…Otros autores (Wang et al, 2019) estudiaron numéricamente y optimizaron un ICDT con un tubo corrugado helicoidal hacia el exterior, en donde de obtuvieron los parámetros de diseño del ánulo bajo determinados parámetros geométricos del tubo corrugado. Igualmente (Ebieto et al, 2020) efectuaron el diseño detallado y posterior construcción de un ICDT de escala de laboratorio que puede operar tanto en flujo en paralelo o a contracorriente. En este trabajo se obtuvieron los parámetros de rendimiento usuales para un equipo de este tipo, es decir, la Media Logarítmica de la Diferencia de Temperatura, la tasa de transferencia de calor, la efectividad y el coeficiente global de transferencia de calor, para ambas configuraciones de flujo.…”