Ali Ghahraei, Nurul Amziah Md Yunus, Izhal Abdul Halin and Nasri Sulaiman
Pertanika Journal of Tropical Agricultural Science, Volume 25, Issue S, February 2017
Keywords: Atmospheric chamber, humidity, silica gel, nitrogen gas, fuzzy controller
Published on: 09 May 2017
Controlled humidity environment is of significance in many scientific researches and experiments. In most laboratory-scale atmospheric chambers, an electrical temperature-based control system is used to adjust humidity. Since these chambers are not affordable in every laboratory, other low cost chambers using nitrogen gas or silica gel are used to adjust humidity. In this paper, a mechanism was developed to control the relative humidity in closed lab-scale chambers. Humidification is done by spraying water through a blower fan while de-humidification is by pumping air through silica gel as well as nitrogen gas injection. A Mamdani type fuzzy controller was designed to control the components and relative humidity. The results show the proposed system and controller can adjust and maintain relative humidity from 41% to 100% with maximum overshoot of 1% and the maximum range of error of steady state of 1.2 %.
ISSN 1511-3701
e-ISSN 2231-8542