Abstract
The aim of this work is to develop a numerical model of the year-round operation of an earth-to-air heat exchanger (EAHE) with a circular cross-sectional shape with further its validation based on the obtained experimental data. We consider that these studies can form the basis for the development of methods for calculating and designing geothermal ventilation systems for climate conditions of Ukraine. The analysis of literature sources showed that now there are quite a lot of studies devoted to the issues of geothermal ventilation. The results of such heat exchanger modeling with various geometric data and which operate in their authentic soils under various hydraulic regimes and that are located at different depths are widely presented. However, these studies do not allow obtaining generalized patterns of heat transfer during the operation of the heat exchangers and the influence of the geometric parameters of the heat exchanger on the operation of the geothermal ventilation system as a whole. Much attention is paid to the issues of modelling the operation of such heat exchangers and the distinctive features of each of these models. Also important are the results of experimental studies carried out on our own experimental bench and with the help of which the numerical model was validated. To conduct experimental research on the operation of the geothermal ventilation system at the Institute of Engineering Thermophysics of the National Academy of Sciences of Ukraine an experimental stand was created. This stand is designed to study thermophysical processes during the operation of a geothermal ventilation system elements. The results of these studies are the basis for the development of a method for determining the optimal diameter of the earth-to-air heat exchanger under operating conditions for soil in Kyiv, Ukraine.
Highlights
The aim of this work is to develop a numerical model of the year-round operation of an earth-to-air heat exchanger
with a circular cross-sectional shape with further its validation based on the obtained experimental data
We consider that these studies can form the basis for the development
Summary
Чисельне моделювання параметрів повітряно-ґрунтових теплообмінників для геотермальної вентиляції Для проведення експериментальних досліджень роботи системи геотермальної вентиляції в Інституті технічної теплофізики Національної академії наук України було створено експериментальний стенд. Що при слабкій зміні середньодобової температури зовнішнього повітря розбіжність результатів не перевищує похибки експериментальних досліджень. Основним елементом системи геотермальної вентиляції є повітряно-ґрунтовий теплообмінник, що знаходиться в ґрунтовому масиві на певній глибині – від 1 до 5 м.
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