UDC 62–5 ONTOLOGY-BASED SYSTEM FOR MODELLING OF THERMAL PROCESSES AND AGGREGATES © Daniela Gocheva, PhD, University of Chemical Technology and Metallurgy, Sofia, Bulgaria Abstract. <...> Information integration and interoperability enables solving many important tasks, associated with the optimal management and control of metallurgical enterprises. <...> The paper presents the development of an information system for modeling of thermal processes and industrial units. <...> The system is based on the developed web ontology for methods and models of thermal processes and aggregates in the metallurgical industry. <...> The ontology of the system is integrated into the developed OWL meta-ontology, based on models and terminology, provided by ISO/IEC62264 standard for information and control systems integration and thus can be used for the purposes of different engineering tasks in the enterprise on the whole. <...> INTRODUCTION The challenges for enterprise integration and networking solutions have been classif ied in [1] according to the following areas: (i) Collaborative Networked Organizations; (ii) Enterprise Modelling and Reference Models; (iii) Enterprise and Processes Models Interoperability; (iv) Validation, Verification, Qualification and Accreditation of Enterprise Models; (v) Model Reuse and Repositories. <...> The importance of ICT, Industry 4.0 and Big Data was reason to establish the task force Integrated Intelligent Manufacturing for the European steel industry [2] — a vision able to drive and combine in a holistic view of modeling, data processing, knowledge, science and the ICT as a whole in order to empower the human interaction with the manufacturing processes. <...> Due to high energy consumption, environmental topics, constraints and quality requirements, thermal aggregates are key units in steel plants. <...> An important prerequisite for effective and optimal functioning of the intelligent integrated systems in steelmaking is the possibility of modeling and simulation through a direct connection to information and control systems of the metallurgical plant. <...> Usage of the models of heating 50 Engineering and Automation Problems, № 1 – 2017 processes can be in several directions: (i) To identify and evaluate oppor tunities for improving the performance of the aggregates for the purpose of quality and economical heating; (ii) To evaluate alternatives in order to achieve economic efficiency, cost reduction and environmental protection; (iii) To design new industry aggregates; (iv) To solve the problems in the functioning; (v) For research, analyses, new developments and training. <...> Nevertheless that fundamental theory <...>