ANALYSIS OF CHANGES IN HEAT OUTPUT FROM RADIATORS DURING THE SWITCH TO LOW-TEMPERATURE HEATING USING GEOTHERMAL ENERGY

• Дата: 2025
• Автор: Lysak , O.
• Формат: Стаття
• Мова: Ukrainian
• Опубліковано: Institute of Renewable Energy National Academy of Sciences of Ukraine 2025
• Теми: geothermal heating; low-temperature heating; radiator; heat output.
• Онлайн доступ: https://ve.org.ua/index.php/journal/article/view/513
• Назва журналу: Vidnovluvana energetika

T he article considers the influence of changes in the temperature mode of the heating system on the heat output from radiators of the water heating system of a building. This influence is considered in the transition from a high-temperature heating system using fossil fuels to a low-temperature geothermal sys-tem. The scheme of operation of geothermal heating systems is considered and compared with the scheme of operation using fossil fuels on the example of natural gas. The temperature modes of the water heating sys-tem are analysed and significant differences in approaches to determining temperature modes are revealed. The equation for determining the heat output of a radiator of a water heating system of a building is consid-ered. It has been found that it is now important to revise the equation for recalculating the heat output of a radiator from the nominal value to the actual value in order to increase the accuracy of determining the heat output of a radiator by taking into account changes in the amount of heating medium (water) passing through the radiator. An analysis of the change in heat output was carried out, taking into account the influ-ence of the average logarithmic temperature difference between the temperature of the heat medium in the radiator and the temperature of the room air temperature. The characteristics of heat output reduction from radiators were obtained. The value of this characteristic was compared with the possible level of heat loss re-duction in a room in the case of thermal modernisation of a residential building in Kyiv. As a result, it was shown that currently only geothermal heating systems using medium temperature conditions can provide the necessary heat output to the premises, provided that they are thermally modernised in accordance with cur-rent standards. In turn, low-temperature geothermal heating systems will require a much greater reduction in heat loss from the room, or alternative solutions aimed at increasing heat output from radiators: either by replacing them with those capable of providing the required heat output, or by installing fans to blow them and further increase heat output.