Стартові характеристики гравітаційних теплових труб з різьбовим випарником

• Дата: 2024
• Автори: Melnyk, Roman, Kozak , Dmitry, Nikolaenko, Yurii, Pekur, Demyd
• Формат: Стаття
• Мова: Ukrainian
• Опубліковано: PE "Politekhperiodika", Book and Journal Publishers 2024
• Теми: теплообмін; теплова труба; низькотемпературний теплоносій; стартова характеристика; стаціонарний тепловий режим; час стабілізації
• Онлайн доступ: https://www.tkea.com.ua/index.php/journal/article/view/TKEA2024.3-4.30
• Назва журналу: Technology and design in electronic equipment

The authors experimentally study start-up characteristics of copper gravitational heat pipes with a threaded evaporator filled with four different heat transfer fluids — methanol, R141b refrigerant, isobutane (refrigerant R600a), and n-pentane — that do not freeze at temperatures as low as –30°C. The heat pipes were 260 mm long, had a diameter of 12 mm, a thread length in the evaporation zone of 45 mm, a thread pitch of 0. 5 mm, and a fluid volume of 1.6 – 1.7 ml (filling ratio of 50 – 55%). It was shown that changing the inclination angle (15°, 60°, 90°) does not significantly affect the temperature in the heating zone of the heat pipe (maximum 5°C for methanol). More significant is the influence of the ambient air temperature (–30°C, +20°C and +40°C). The maximum thermal regime stabilization time (22 – 24 min) was observed in the heat pipe with methanol at an ambient temperature of –30°C, while the minimum stabilization time (11 – 12 min) was recorded for heat pipes with isobutane and n-pentane at an air temperature in the chamber of +40°C.