BASIC PRINCIPLES OF CONSTRUCTION OF NEW CRITERIA FOR EVALUATION OF EFFICIENCY OF HEAT EXCHANGE EQUIPMENT

Актуальные проблемы современной науки: тезисы докладов XLІІІ Международной научно-практической конференции (Харьков – Вена – Берлин – Астана, 29 августа 2019)

Section: Technical Sciences

Fialko Nataliia

Doctor of Technical Sciences, Professor,

 Corresponding Member of NAS of Ukraine,

Honored Worker of Science and Technology of Ukraine,

Department Head

Institute of Engineering Thermophysics of

National Academy of Sciences of Ukraine

Kyiv, Ukraine

Stepanova Alla

PhD, Leading Researcher

Institute of Engineering Thermophysics of

National Academy of Sciences of Ukraine

Kyiv, Ukraine

Navrodskaya Raisa

PhD, Senior Researcher, Leading Researcher

Institute of Engineering Thermophysics of

National Academy of Sciences of Ukraine

Kyiv, Ukraine

Novakovskyi Maksim

PhD, Senior Researcher, 

Institute of Engineering Thermophysics of

National Academy of Sciences of Ukraine

Kyiv, Ukraine

BASIC PRINCIPLES OF CONSTRUCTION OF NEW CRITERIA FOR EVALUATION OF EFFICIENCY OF HEAT EXCHANGE EQUIPMENT

Now the performance of power plants, including heat exchange equipment, is evaluated by a number of efficiency criteria, which based on a particular approach to their construction: thermodynamic, heat engineering, technological, exergy and economic [1, 2]. The paper proposes a comprehensive approach to the construction of new efficiency criteria, which allows to consider several different aspects together when analyzing the efficiency of heat recovery equipment. The following basic principles were used to construct such criteria:

• the efficiency criteria should combine the most important thermodynamic, heat engineering and technological characteristics of the heat recovery system;
• the criteria should be highly sensitive to changes in the structural and mode parameters of the system;
• the criteria should serve the objective functions of optimization in solving optimization problems for the heat recovery system or its individual elements.

A comprehensive approach to the evaluation of the power plants efficiency involves the construction of efficiency criteria combining such important characteristics of the heat recovery system, such as exergy losses, heat power, specific material consumption, etc., which allows to evaluate the operation of the system simultaneously from thermodynamic, heat engineering and technological positions.

High sensitivity of efficiency criteria can be achieved by including in the criteria some exergy characteristics that undergo significant changes when changing the mode and design parameters of heat recovery systems.

The use of efficiency criteria as target optimization functions in solving optimization problems implies the possibility of establishing their functional dependencies on the design and mode parameters of the heat recovery system or its individual elements.

On the basis of these principles of construction, heat-exergy and exergy-technological efficiency criteria are proposed, which are used to evaluate the efficiency of heat recovery systems of boiler units and glass furnaces, including water heating and air heating heat utilizers [3].

References

1. Morosuk Т., Tsatsaronis G. A new approach to the exergy analysis of absorption refrigeration machines // Energy. 2008. V. 33. Issue 6. Р. 890-907. doi.org/10.1016/j.energy.2007.09.012.
2. Tsatsaronis G., Morosuk T. Advanced thermodynamic (exergetic) analysis // Journal of Physics: Conference Series. 2012. V. 395. 012160. P. 8-15.  doi.org / 10.1016 / j.energy.2005.08.001
3. Fialko N., Stepanova A., Navrodska R., Meranova N., Sherenkovskyi Ju. Efficiency of the air heater in a heat recovery system at different thermophysical parameters and operational modes of the boiler // Восточно-Европейский журнал передовых технологий, 2018, 6/8 (96). С. 43-48. DOI: 10.15587/1729-4061.2018.147526;