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... equation is applied to the different arrangement tube types: triangular, square, and rhombic. For each case, the constant are presented in Table 1. It was determined 4% as that the maximum error between the equa- tions and the graphic presentation. ...
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... In other study, (Kulkarni et al., 2014) accomplished a comparative analysis of a water to water STHX to study and analyze the heat transfer coefficient and pressure drops for different mass flow rates and inlet and outlet temperatures, using Kern, Bell and Bell-Delaware methods. Moreover, (Toledo et al., 2014) analyzed and upgraded the Bell-Delaware method using correction factors which take into account the undesirable currents of the mean flow, in order to explore different design alternatives to find the optimal solution to each proposed problem. The results of this work was a simple software that can perform calculations with the introduction of parameters depending only on the geometry of the heat exchanger, temperature and fluid characteristics, thus eliminating the human errors and increasing the calculations speed and accuracy. ...
Shell and tube heat exchangers are becoming the most popular devices for the transfer of heat in industrial process applications. In the present work, the thermo-hydraulic rating of a shell and tube heat exchanger proposed to cool an acetone stream was carried out using the Bell-Delaware methodology. An overall heat transfer coefficient value of 426.70 W/m2.K, a calculated heat transfer area of 121.46 m2, and a percent excess area of 20.83% were obtained. Both the pressure drop of acetone and water had values of 1,622.36 Pa and 3,020.46 Pa, respectively. The proposed shell and tube heat exchanger can be used satisfactorily for the required application, since the percent excess area does not exceed the 25%, and the pressure drops of both fluid streams are below the limit values established by the process.
Las micro y pequeñas empresas del sector de manufactura en Colombia se caracterizan por la utilización de máquinas y tecnologías atrasadas, personal semicalificado y no calificado [DANE. 2014], y limitadas posibilidades de inversión en nuevas tecnologías para la manufactura. Las causas de este problema son diversas, pero se destacan:
—La dificultad de las microempresas para satisfacer los requisitos del financiamiento formal.
—Elevado costo de los sistemas de manufactura tradicionales y los sistemas flexibles de manufactura [Pham, 1998].
—Elevado costo en el software de diseño y de manufactura por computador bajo licencia.
En este artículo se describe el proceso de diseño y fabricación de un prototipo de máquina de manufactura multifuncional (aditiva y sustractiva) asistida por computador, de bajo costo, orientada a la solución de necesidades de fabricación de las micro y pequeñas empresas de transformación de materiales.
Heat exchangers have been the subject of study for over a century. Its classification has opened various branches of study. Among the equipment called recuperators are those of the casing and tube type. These equipments are used to carry out cooling and heating processes from water circuits. Although water is not the only substance of interest, a large number of research papers address hydrodynamic behavior coupled to heat exchange processes in elements of different sizes, with various flow arrangements and of various types, such that it is desired to characterize them depending on the thermal performance to mainly achieve some target temperature in the fluids involved, even when this involves dealing with large pressure drops. In this way, the generation of computational tools that help the understanding of functionality under certain operating conditions has been proposed, as well as the manufacturing with certainty and low cost. The verified and validated results of an application developed with accessible computing resources establish a contribution in this active field of engineering.
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