Numerical Method Approach to Calculate Earth-Energy of Earth-Pipe-Air Heat-Exchanger for Winter Heating

Molcrette, V.; Autier, V.; Zalewski, Laurent; Lassue, Stéphane

doi:10.4028/www.scientific.net/amm.831.278

Cited by 3 publications

(7 citation statements)

References 3 publications

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“…Meteorological station Kraków-Balice is located at the altitude of h = 237 m above sea level. Then from Equation (28) we get:…”

Section: Thermal Properties Of Dry Airmentioning

confidence: 99%

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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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“…Meteorological station Kraków-Balice is located at the altitude of h = 237 m above sea level. Then from Equation (28) we get:…”

Section: Thermal Properties Of Dry Airmentioning

confidence: 99%

“…Other tools, as Ansys Fluent [20][21][22], Ansys CFX [23], Comsol Multiphysics [24], Matlab [25][26][27] or Scilab [28] were also used. However, although they offer great possibilities, their use requires specialised knowledge and experience.…”

Section: Introductionmentioning

confidence: 99%

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

Michalak

2022

Energies

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“…The software HeatGround developed in the laboratory [2] uses thermal modeling in two dimensions, for cylindrical exchangers, as presented in Fig. 2.…”

Section: Application Of Heatgroundmentioning

confidence: 99%

“…According to [7], there is no influence between the use of PCV or steel for the tube. The author [2] presented a table with simulation data.…”

Section: Influence Of Parametersmentioning

confidence: 99%

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Archives of Thermodynamics

Molcrette

Autier

2020

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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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Archives of Thermodynamics

Ahmad,

Prakash

2022

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This paper presents the experimental investigation of an earthto-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 Method Approach to Calculate Earth-Energy of Earth-Pipe-Air Heat-Exchanger for Winter Heating

Cited by 3 publications

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

Archives of Thermodynamics

Archives of Thermodynamics

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