Hourly Simulation of an Earth-to-Air Heat Exchanger in a Low-Energy Residential Building

Michalak, Piotr

doi:10.3390/en15051898

Cited by 11 publications

(13 citation statements)

References 97 publications

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“…For this purpose, the method given in EN 16798-5-1 was used. Simplification assumptions of that model were given and discussed in [35,[53][54][55]. The most important are as follows:…”

Section: Earth-to-air Heat Exchangermentioning

confidence: 99%

“…However, in varying ambient conditions (March, April, September, and October) and the thermal demand of the building changing during the day from heating to cooling and vice versa, the effect is not so obvious. Then it seems to be more beneficial to introduce a bypass to switch the intake of ventilation air between EAHE and outdoor air [35,50,51,96].…”

Section: Energy Performance Of the Buildingmentioning

confidence: 99%

“…Michalak [35] coupled the model of EN 16798-5-1 with the thermal network model of a building zone from EN ISO 13790 [36] in an MS Excel spreadsheet to simulate in hourly time step an annual performance of EAHE connected with a ventilation system of a low-energy residential building in south Poland. In this way, hourly, as well as monthly and annual energy use for space heating and cooling and peak power with and without EAHE was estimated simply and efficiently.…”

Section: Introductionmentioning

confidence: 99%

“…In [34] the air density was assumed constant. In [35,38] no information on the air density was given. Variation of thermal properties of air was considered in Comsol Multiphysics [24] and TRNSYS [38].…”

Section: Introductionmentioning

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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“…For this purpose, the method given in EN 16798-5-1 was used. Simplification assumptions of that model were given and discussed in [35,[53][54][55]. The most important are as follows:…”

Section: Earth-to-air Heat Exchangermentioning

confidence: 99%

Section: Energy Performance Of the Buildingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

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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“…A longer pipe with a smaller buried diameter having a lower airflow velocity generates an optimal performance of the EAHE system [22]. Michalak et al [23] showed that a study of the operation of a building connected to EAHE model via simple thermal dynamics.…”

Section: Introductionmentioning

confidence: 99%

Thermal Performance of EAHE System in Algerian Site: Case Study of Ghardaïa

Benbelgacem¹,

Kaddour²,

Bezari³

et al. 2022

IJDNE

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Among the renewable energies there is geothermal energy, conventional air conditioning has negative consequences on the environment, to have an economical and sustainable solution: the EAHE respond to this concern. In the current study, the study of the thermal performance of the earth-air heat exchanger (EAHE) has been completed. For the impact of transient heat transfer in the ground near the hose, the thermal saturation of the ground is well mentioned. In addition, the role of the burial depth of the EAHE system is also taken into account during this work. The suitable depth of the buried tubes was determined by implementing the thermo-physical properties of the soil of the studied site located in Ghardaïa (Algeria) by writing a specific program. A parametric investigation was accomplished the effects of the length and the diameter of the pipe, in addition the speed of the inlet air on the temperature of the outlet of the EAHE system in both cases PVC and HDPE material. The results showed that the optimal parameters in order to obtain a good performance for the studied EAHE: maximal value of pipe length, and minimal values of diameter pipe and air velocity 30 mm and 1.2 m/s respectively.

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