TARGET FUNCTIONS OF OPTIMIZATION OF HEAT RECOVERY SYSTEMS

The expenditure of energy resources on industrial production in Ukraine, as a rule, significantly exceeds the world average, therefore, the creation of effective equipment for power plants of different types is an important and urgent problem. A necessary condition for increasing the efficiency of equipment is thermodynamic optimization. Its main problems include the selection of optimization target functions that can be used to solve optimization problems. The aim of the work is to develop the basic principles for constructing optimization target functions necessary for solving optimization problems in heat recovery systems. The results of the analysis of the target functions of optimization of power plants, the construction of which is based on the use of exergy methods, are presented. Based on the analysis, the main principles for constructing the indicated functions necessary for solving optimization problems in heat recovery systems have been developed. An integrated approach to the construction of target functions is proposed. This approach allows to evaluate its performance from various positions when analyzing the efficiency of heat recovery equipment. As optimization target functions, criteria that are highly sensitive to changes in the design and operation modes of the heat recovery system and allow you to establish the necessary functional dependencies are proposed. An example of the application of the optimization target functions the parameters of a contact plate air heater included in the combined heat recovery system of a boiler plant designed to heat water and blast air is given.