Proceedings of the International scientific and practical conference ―Multidisciplinary approaches in science, technology and culture‖ (September 5-7, 2025) / Publisher website: www.naukainfo.com. – Oxford, United Kingdom, 2025. - 124 p.

117 UDC 536.7:621.577:697.9 Pysarevskyi Ihor PhD Student Mukminov Ihor PhD, Senior Lecturer Odesa National University of Technology, Odesa, Ukraine Pysarevskyi Illia Student Taras Shevchenko National University of Kyiv, Kyiv, Ukraine UTILIZATION OF PARAFFIN AS A PHASE CHANGE HEAT STORAGE MATERIAL IN AGRICULTURAL STRUCTURES Abstract: This article explores the use of paraffin T3 as a phase change material (PCM) for passive heat storage in agricultural buildings. The thermal properties of paraffin—including high latent heat of fusion, chemical stability, and safety—are analyzed. A performance assessment is conducted based on thermal charging and discharging scenarios. The study demonstrates the potential of paraffin-based heat accumulators to stabilize indoor temperatures in greenhouses, poultry houses, and pigsties, reducing the need for active heating. Design considerations for improving heat transfer efficiency are discussed. It is concluded that, despite the relatively high melting point (~50–55 °C), paraffin T3 remains a promising, cost-effective material for thermal regulation in agriculture, especially when integrated with solar collectors or excess daytime heat sources. Keywords : paraffin T3, phase change material, heat storage, agricultural buildings, thermal energy, phase transition, energy efficiency, greenhouse, passive heating, PCM