Wyniki wyszukiwania - BazTech

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Analysis of the Energy Efficiency of the Earth-To-Air Heat Exchanger

Basok Boris, Pavlenko Anatoliy, Nedbailo Aleksandr, Bozhko Ihor, Novitska Maryna, Koshlak Hanna, Tkachenko Myroslav

Rocznik Ochrona Środowiska

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2022

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Tom 24

202--213

EN

This article represents the results of experimental studies of the temperature regime during the long-term operation of the earth-to-air heat exchanger. The average annual, total monthly and daily average specific amounts of heat extracted from the soil or released into the soil mass, respectively, depending on the cold or warm periods of the year, were determined. Analyzing the given data allowed a monthly assessment of the energy efficiency of using the earth-to-air heat exchanger. It is noted that the most significant thermal contribution occurs in the middle of the warm and cold periods of the year when the most significant difference in temperature of the outside air and the soil massif is observed. The use of earth-to-air heat exchangers is one of the necessary tools to lower the energy consumption for modern air-conditioning systems of buildings due to their energy efficiency.

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Thermal performance evaluation of an earth-to-air heat exchanger for the heating mode applications using an experimental test rig

Ahmad Saif Nawaz, Prakash Om

Archives of Thermodynamics

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2022

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Vol. 43, no 1

185--207

EN

This paper presents the experimental investigation of an earth-to-air heat exchanger for heating purposes in the Patna region of India, using an experimental test rig. In the view of the author, real field experiments have several limitations such as lack of repeatability and uncontrolled conditions. It also takes more time for the response of parameters that depends on nature and climate. Moreover, earth-to-air heat exchangers may be expensive to fabricate and require more land area. Thus, in this work authors executed their experimental work in indoor controllable environments to investigate the thermal performance of an earth-to-air heat exchanger. The actual soil conditions were created and maintained the temperature at 26°C throughout the soil in the vicinity of pipes. Three horizontal PVC pipes of equal lengths and diameters of 0.0285 m, 0.038 m and 0.0485 m were installed in the test rig. The experiments were performed for different inlet air velocities at ambient air temperature. This study acknowledges that the maximum rise in outlet temperature occurs at a lower speed for smaller pipes. Also, the maximum effectiveness of 0.83 was observed at 2 m/s for the smallest diameter pipe.

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Numerical Modeling and Experimental Studies of the Operational Parameters of the Earth-To-Air Heat Exchanger of the Geothermal Ventilation System

Basok Boris, Bozhko Ihor, Novitska Maryna, Nedbailo Aleksandr, Tkachenko Myroslav

Rocznik Ochrona Środowiska

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2021

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Tom 23

42--64

EN

This article is devoted to the analysis of the heat engineering characteristics of the operation of an Earth-to-Air Heat Exchanger, EAHE, with a circular cross-sectional shape, which is a component of the geothermal ventilation system. The authors analyzed literature sources devoted to the research of heat exchangers of the soil-air type of various designs and for working conditions in various soils. Much attention is paid to the issues of modeling 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. The results of these studies are the basis for the development of a method for determining the optimal diameter of an EAHE under operating conditions for soil in Kyiv, Ukraine.

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Uproszczona metoda wymiarowania i oceny opłacalności gruntowego wymiennika ciepła w układzie wentylacji budynku

Szymański M., Wojtkowiak J.

Ciepłownictwo, Ogrzewnictwo, Wentylacja

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2007

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R. 38, nr 7-8

55-58

PL

W artykule przedstawiono uproszczoną metodę określania średnicy i długości rur gruntowego wymiennika ciepła GWC, pracującego w układzie wentylacji budynku jednorodzinnego. Ideą metody jest minimalizacja kosztów energii niezbędnej na podgrzanie i wymianę powietrza wentylacyjnego. Przeprowadzone obliczenia dla okresu grzewczego pokazały, że maksymalna obniżka kosztów działania układu wentylacji, spowodowana zastosowaniem GWC wynosi ok. 9,4%. Wykazano, że źle zaprojektowany GWC może spowodować wzrost kosztów eksploatacji układu wentylacji.

EN

A simplified method of calculation, concerning the diameter and length of pipes of an earth-to-air heat exchanger, operating in a ventilation system of a single-family building, is presented. The aim of the method is minimisation of the costs of the energy, provided for heating and air exchange through the system. The calculations, carried out for the heating period, show that the maximum reduction of system operating costs, resulting from the application of the exchanger, amounts to about 9.4%. It is also shown that in the case of an improper design of the exchanger, the costs of the system operation may increase.