Diseño, automatización e instalación de un sistema de ambiente controlado bajo la norma ISO/IEC 17025 para la bodega del laboratorio de equipos de metrología de la Facultad de Mecánica - ESPOCH

Abstract

The objective of this technical project was to design, automate and install a controlled environment system for the warehouse of the metrology laboratory of the Faculty of Mechanics - ESPOCH. The Quality Deployment Function (QFD) was carried out based on the system requirements for a temperature control of 20 ± 1 ° C and relative humidity of 50 ± 5% and the technical specifications that the system should have, obtaining the best alternative solution. Total heat loads for cooling 21786.79 BTU / h and heating -8038.31 BTU / h were calculated using the ASHRAE CLTD / SLC / CLF method. The selection of the equipment was made based on the requirements that must be met, for the temperature control a Samsung window-type air conditioner of 24000 BTU and an ENVI heater of 475 Watts was selected, while to control the relative humidity it was selected a Soleus Air dehumidifier. The automation of the system was carried out by means of a CLICK Koyo PLC, a kinco HMI screen and four RS485 modbus RTU humidity and temperature sensors. Using the CAE software for finite elements and volumes ANSYS FLUENT, a simulation of the system was performed where the heat distribution, air flow velocity, temperatures and maximum and minimum speeds within the metrology laboratory warehouse could be observed. The results obtained in the performance tests show that the system works within the ranges established by the ISO / IEC 17025 standard. It was possible to control the environmental conditions inside the laboratory warehouse by means of the installed system. It is recommended to implement a controlled environment cabin for the calibration blocks as these require more stringent conditions of temperature and relative humidity.