Black-box modeling and adaptive control of hybrid thermoelectric refrigerator systems

Doctor of Philosophy in Mechatronic Engineering

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Bibliographic Details
Main Author:	Mohd Saifizi, Saidon
Other Authors:	Wan Khairunizam, Wan Ahmad, Assoc. Prof. Dr.
Format:	Thesis
Language:	English
Published:	Universiti Malaysia Perlis (UniMAP) 2016
Subjects:	Thermoelectric cooling Hybrid Thermoelectric Refrigerator (H-TER) Vaccines carrier
Online Access:	http://dspace.unimap.edu.my:80/xmlui/handle/123456789/77898
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Institution:	Universiti Malaysia Perlis
Language:	English

id	my.unimap-77898
record_format	dspace
spelling	my.unimap-778982023-02-21T06:59:19Z Black-box modeling and adaptive control of hybrid thermoelectric refrigerator systems Mohd Saifizi, Saidon Wan Khairunizam, Wan Ahmad, Assoc. Prof. Dr. Thermoelectric cooling Hybrid Thermoelectric Refrigerator (H-TER) Vaccines carrier Doctor of Philosophy in Mechatronic Engineering Vaccines carrier has been used to keep the temperature within 2–8°C. However, a poorly functioning vaccines carrier may expose the vaccines to freezing temperatures. Hybrid Thermoelectric Refrigerator (H-TER) systems are developed in order to transport sensitive vaccines to hospitals at accurate controlled temperature. The refrigerator use air-to-air and direct thermoelectric heat pumps. This work reports on modeling and control studies carried out for H-TER systems that can control low temperature accurately. Different type of material containers (aluminium and stainless steel) is used and comparisons between them are analyzed. The systems are nonlinear and exhibits varying model parameters and dead-time. The objective of the study is to investigate control strategies that are based on non-priori plant knowledge and yet allowing for continuous adaptations of the controller to changing system dynamics. In fact, the various cooling load also causes a reduction of refrigerator efficiency including the fluctuation of imposed current level due to electronic component performance and varied operating condition of thermoelectric module on cold and hot ends against time. Thus an adaptive control system is considered to handle the problems that are stipulated above. A black box modeling approach is chosen since this is needed for the implementation of adaptive controllers. The H-TER systems have been identified using both Recursive Least Squares (RLS) and Recursive Extended Least Squares (RELS) methods. Since RELS has shown to give biased estimates for filtered data and slow convergence estimates for unfiltered data, RLS has been chosen for the model as its give a better representation of the systems. A second order model of H-TER I and HTER II systems are found to adequately represent the system as it give best fit of 0.0009 and 0.0007 respectively which made the fourth order to be insignificant for implementation. Validation procedures using second order model for online estimation, show that the model is indeed a good representation of the H-TER systems. On-Off and PI controllers are the commonly used in thermoelectric system is applied to this system as case studies. PI controller shows better performance over On-Off controller in term of steady state error. 2016 2023-02-21T06:53:46Z 2023-02-21T06:53:46Z Thesis http://dspace.unimap.edu.my:80/xmlui/handle/123456789/77898 en Universiti Malaysia Perlis (UniMAP) Universiti Malaysia Perlis (UniMAP) School of Mechatronic Engineering
institution	Universiti Malaysia Perlis
building	UniMAP Library
collection	Institutional Repository
continent	Asia
country	Malaysia
content_provider	Universiti Malaysia Perlis
content_source	UniMAP Library Digital Repository
url_provider	http://dspace.unimap.edu.my/
language	English
topic	Thermoelectric cooling Hybrid Thermoelectric Refrigerator (H-TER) Vaccines carrier
spellingShingle	Thermoelectric cooling Hybrid Thermoelectric Refrigerator (H-TER) Vaccines carrier Mohd Saifizi, Saidon Black-box modeling and adaptive control of hybrid thermoelectric refrigerator systems
description	Doctor of Philosophy in Mechatronic Engineering
author2	Wan Khairunizam, Wan Ahmad, Assoc. Prof. Dr.
author_facet	Wan Khairunizam, Wan Ahmad, Assoc. Prof. Dr. Mohd Saifizi, Saidon
format	Thesis
author	Mohd Saifizi, Saidon
author_sort	Mohd Saifizi, Saidon
title	Black-box modeling and adaptive control of hybrid thermoelectric refrigerator systems
title_short	Black-box modeling and adaptive control of hybrid thermoelectric refrigerator systems
title_full	Black-box modeling and adaptive control of hybrid thermoelectric refrigerator systems
title_fullStr	Black-box modeling and adaptive control of hybrid thermoelectric refrigerator systems
title_full_unstemmed	Black-box modeling and adaptive control of hybrid thermoelectric refrigerator systems
title_sort	black-box modeling and adaptive control of hybrid thermoelectric refrigerator systems
publisher	Universiti Malaysia Perlis (UniMAP)
publishDate	2016
url	http://dspace.unimap.edu.my:80/xmlui/handle/123456789/77898
_version_	1772813083314487296

Black-box modeling and adaptive control of hybrid thermoelectric refrigerator systems

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