Eventos Anais de eventos
ENCIT 2018
Brazilian Congress of Thermal Sciences and Engineering
Construction of a Didatical Workbench for a Performance Analysis of a Heat Exchanger Contracorrent Hub
Submission Author:
Jurandir Sousa , PA
Co-Authors:
Ana Karolina Bustamante, Rodrigo Willian Teles Paixão, Jurandir Sousa, Druscilla Zaghetti, Ronaldo Moura, Jessé Padilha
Presenter: Ana Karolina Bustamante
doi://10.26678/ABCM.ENCIT2018.CIT18-0210
Abstract
This project consists of the construction of a didactic workbench, which is able to provide practical data for the study of the thermal performance of a countercurrent hull heat exchanger. The design was divided into three stages: hydraulic part, support and control. The first one consists of two reservoirs, the reservoir 1 being used to circulate the heated water from circuit 1, which runs through the entire hull of the exchanger and returns to its reservoir, while circuit 2 promotes water circulation that runs through all passes from the exchanger tubes returning to the reservoir 2. The support structure has been dimensioned to accommodate the system as a whole. The third and last stage was the assembly of the control system, which is composed of an arduino board, globe valves and flow sensors (Hall type sensor). At the end of the construction, the following tests were performed: the globe valves of the two circuits were tested in the open state; with the circuit 1 fully open and the circuit 2 50% open and also with the circuit 1 50% open and the circuit 2 fully open. Then, with the aid of thermometers, the inlet and outlet temperatures of the fluid were measured for the operation configurations described above. Two methods of analysis of the data obtained in the heat exchangers were used: LOG mean of the temperature differences and the effectiveness-NUT method. After performing a calculation routine in MS-Excel software, the required heat rates, effectiveness, NUT and overall heat transfer coefficient (U) were determined. The values found were within a plausible range with the references used, which gives reliability to the data.
Keywords
Didatical Workbench, Thermal performance, Hull and Tube Heat Exchanger
