Logvynenko V. Optimization of Ship Refrigerating Complex' Operational Modes

Object of research is processes in a ship freezing complex and their automation; the purpose of research is ensuring of a minimum of specific power inputs on freezing and development of automatic system of complex optimization of minimum specific energy consumption regimes; methods of research are methods of the heat-mass exchange theory and thermodynamics, methods of optimization and probability theory, methods of the theory of automatic control, methods of a numerical modeling on a computer; the theoretical and practical outcomes - the static and the dynamic non-linear multidimensional closed models of a ship freezing complex are developed; the self-learning system of extrapolation search of a minimum conditions of a specific energy consumption is developed; the automatic regulation system of an air temperature in a freezing chamber and condensation temperature of a coolant is developed; the dynamic non-linear model of a compressor complex and the local control system of symmetrical work of compressors are developed; the microprocessor implementation of an integrated system of automatic control of a ship freezing complex is offered; the novelty - specific consumption of energy on freezing in a ship freezing complex which is depending on main performance parameters - boiling and condensation temperatures of a coolant, represents as a parabolic surface having floating minimum point; the determination of minimum point of a specific energy consumption on freezing is ensured with self-learning system of multidimensional extrapolation search of optimum regimes of operation; for the first time conditions of obtaining of a minimum of specific power inputs during to operation of a freezing complex are defined; the non-linear dynamic model of a ship freezing complex considering for availability of natural lag has received a further development; for the first time the multidimensional closed-loop system of autocontrol of an air temperature in a freezing chamber and condensation temperature of a coolant in a ship freezing complex is developed; for the first time the non-linear dynamic model of compressors in conditions of their parallel operation is obtained; for the first time the control system of work of two compressors ensuring their symmetrical operation is synthesized; degree of application - the outcomes of dissertation work will be taken to application at designing of freezing complexes of refrigerator ships in public corporation "CHERNOMORSUDOPROJECT S.A."; the materials of dissertation work are recommended to application in "ANTARCTICA" Ltd; some results of the dissertation are used in educational process of the Odessa national marine academy; sphere of usage is ship refrigerating plants and their automation