Archives of Thermodynamics

Molcrette, V.; Autier, Vincent A.R.

doi:10.24425/ather.2020.133624

2020

DOI: 10.24425/ather.2020.133624

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Archives of Thermodynamics

V. Molcrette

Vincent A.R. Autier

Abstract: A new expression is proposed to calculate the earth-energy of an earth-air-pipe heat exchanger during winter heating for three kinds of soil in France. An analytical model is obtained by using numerical computation developed in Scilab -a free open source software. The authors showed the comparison between their simple analytical model and experimental results. They showed the influence of different parameters to specify the size of the heat exchanger.

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2022

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Impact of Air Density Variation on a Simulated Earth-to-Air Heat Exchanger’s Performance

Michalak

2022

Energies

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Due to their simple design and reliable operation, earth-to-air heat exchangers (EAHE) are used in modern buildings to reduce ventilation heat losses. EAHE operation in atmospheric conditions results in variation in ambient air temperature and pressure affecting air density. The paper presents the study on the impact of ambient air density variation on the calculated hourly air temperature at the EAHE outlet and the resulting energy use for space heating and cooling of an exemplary residential building. The ground temperature was computed from the model given in EN 16798-5-1. Then, air density was obtained using five various methods. Energy use for space heating and cooling of the building was computed using the 5R1C thermal network model of EN ISO 13790. Depending on the chosen method and concerning the base case without EAHE, a reduction in annual heating and cooling needs was obtained from 7.5% to 8.8% in heating and from 15.3% to 19% in cooling. Annual heating and cooling gain from EAHE were 600.9 kWh and 628.3 kWh for heating and 616.9 kWh and 603.5 kWh forcooling for the Typical Meteorological Years (TMY) and International Weather for Energy Calculation (IWEC) files, respectively. Unit heating and cooling gains per heat exchanger area were from 34.9 kWh/m2 to 36.8 kWh/m2 and from −35.1 kWh/m2 to −36.3 kWh/m2. Density variation with temperature from the relevant typical Polish meteorological year at constant pressure, in comparison to the method of EN 16798-5-1, resulted in an hourly difference of that unit gain up to 4.3 W/m2 and 2.0 W/m2 for heating and cooling, respectively. The same was true inthe case of IWEC files that resulted in differences of 5.5 W/m2 and 1.1 W/m2.

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Impact of Air Density Variation on a Simulated Earth-to-Air Heat Exchanger’s Performance

Michalak

2022

Energies

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Archives of Thermodynamics

Cited by 1 publication

References 3 publications

Impact of Air Density Variation on a Simulated Earth-to-Air Heat Exchanger’s Performance

Impact of Air Density Variation on a Simulated Earth-to-Air Heat Exchanger’s Performance

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