Browsing by Author "Isler, Yalcin"

Now showing 1 - 2 of 2

Citation - WoS: 7
Citation - Scopus: 8
Design of microcontroller-based decentralized controller board to drive chiller systems using PID and fuzzy logic algorithms
(SAGE Publications Ltd, 2020) Yalcin Yalcin Isler; Savaş Şahin; Orhan Ekren; Cüneyt Güzeliş; Isler, Yalcin; Ekren, Orhan; Guzelis, Cuneyt; Sahin, Savas
This study deals with designing a decentralized multi-input multi-output controller board based on a low-cost microcontroller which drives both parts of variable-speed scroll compressor and electronic-type expansion valve simultaneously in a chiller system. This study aims to show the applicability of commercial low-cost microcontroller to increase the efficiency of the chiller system having variable-speed scroll compressor and electronic-type expansion valve with a new electronic card. Moreover the refrigerant system proposed in this study provides the compactness mobility and flexibility and also a decrease in the controller unit’s budget. The study was tested on a chiller system that consists of an air-cooled condenser a variable-speed scroll compressor and a stepper driven electronic-type expansion valve. The R134a was used as a refrigerant fluid and its flow was controlled by electronic-type expansion valve in this setup. Both variable-speed scroll compressor and electronic-type expansion valve were driven by the proposed hardware using either proportional integral derivative or fuzzy logic controller which defines four distinct controller modes. The experimental results show that fuzzy logic controlled electronic-type expansion valve and proportional integral derivative controlled variable-speed scroll compressor mode give more robustness by considering the response time. © 2022 Elsevier B.V. All rights reserved.
Citation - WoS: 13
Citation - Scopus: 14
Spatiotemporal chaotification of delta robot mixer for homogeneous graphene nanocomposite dispersing
(ELSEVIER, 2020) Savas Sahin; Ali Emre Kavur; Sibel Demiroglu Mustafov; Ozgur Seydibeyoglu; Ozgun Baser; Yalcin Isler; Cuneyt Guzelis; Seydibeyoglu, Ozgur; Kavur, Ali Emre; Baser, Ozgun; Guzelis, Cuneyt; Sahin, Savas; Isler, Yalcin; Demiroglu Mustafov, Sibel; Mustafov, Sibel Demiroglu
This paper presents the design implementation and polymer nanocomposite mixing application of a robust spatiotemporal chaotic delta robot. Blending fluids efficiently is a vital process for the preparation of graphene nanocomposite mixing. The most commonly used mixing materials are polymeric materials that need to be blended in non-Newtonian fluids. To achieve a superior blending performance over the conventional ones it is used two different chaotification mechanisms for the realization of the spatiotemporal chaotic delta robot mixer system. One of them is for the chaotification of the mixer propeller while the second one is for the chaotification of the three-dimensional position of the endpoint of the delta robot. The model-based robust chaotification scheme based on sliding mode control is applied to chaotify the speed of the delta robot-mixer via dynamical state-feedback chaotification method. The chaotification of 3D position of the mixer is realized in a feedforward way by producing chaotic input signals. The implemented robust chaotic delta robot mixer exploits the efficacy of chaotic mixing in obtaining homogeneity in the mixture with less operation time and hence reduced electrical energy consumption. In these performance evaluations energy consumption and material characterization which are measured by reliable material characterization methods such as X-ray diffraction Fourier-transform-infrared spectroscopy water contact angle dynamical mechanical analysis atomic force microscopy Raman and field emission-scanning electron microscope analyses are used as criteria. The obtained results show that for the delta robot the proposed chaotic-speed together with 3D chaotic-movement operation mode provides a better mixing performance than other mixing operation modes. (C) 2020 Elsevier B.V. All rights reserved.