### MODELING OF AN ADVANCED HEAT EXCHANGE UNIT WITH MICROCHANNELS FOR A COMBINED PHOTOENERGY SYSTEM

R. V. Zaitsev
2017 Electrical Engineering & Electromechanics
Purpose. Mathematical modeling of the heat exchange unit main parameters for photoenergy system based on general models with forced circulation of heat transfer fluid. Methodology. To determine the coefficient of heat transfer at a given coolant temperature and surfaces temperature necessary to determine the temperature gradient in the wall of the heat exchanger. Temperature gradients can be determined by solving the equation of energy, which depends on the distribution of the flow rate in the
more » ... e flow rate in the flow. In general, a solution of convective heat transfer fluid to flow along the plane comes to solution of the system of differential equations. Results. In the paper features of the selection of theoretical basis and mathematical modeling of thermal processes in the heat exchange unit for combination photoenergy system are presented. As a result of the simulation conducted we improve and develop high-efficiency heat exchange unit with microchannels. Testing of the proposed unit proved its high efficiency through the implementation of turbulent flow of coolant with heat transfer coefficient at 18 kW/(m 2 K). Analytical testing of the heat exchanger allowed showing that heat exchanger unit provides a stable operating temperature at less than 50 °C with the coolant flow rate is less than 0.3 m/s. Originality. Novelty of the proposed heat exchanger is in the optimal design of microchannels to improve the heat transfer coefficient. Practical value. The use of this heat exchanger will improve the quality and uniformity of cooling solar panels and reduce energy costs for circulation of fluid. References 12, figures 4. Key words: heat exchanger unit, coolant, solar panels, combined photoenergy system. В работе рассматриваются особенности подбора теоретических основ и математическое моделирование тепловых процессов в теплообменном блоке для комбинированной фотоэнергетической установки. По результатам моделирования проведено совершенствование и разработка высокоэффективного теплообменного блока с микроканалами. Апробация предложенного блока подтверждает его высокую эффективность за счет реализации турбулентного режима протекания теплоносителя. Использование такого теплообменника позволить повысить качество и равномерность охлаждения солнечных батарей и уменьшить затраты энергии на циркуляцию жидкости. Библ. 12, рис. 4. Ключевые слова: теплообменный блок, теплоноситель, солнечная батарея, комбинированная фотоэнергетическая установка. How to cite this article: Zaitsev R.V. Modeling of an advanced heat exchange unit with microchannels for a combined photoenergy system.