Experimental study of the efficiency of earth-to-air heat exchangers: Effect of the presence of external fans

Ahmad, Harith; Sakhri, Nasreddine; Menni, Younes; Omri, Mohamed; Ameur, Houari

doi:10.1016/j.csite.2021.101461

Cited by 22 publications

(5 citation statements)

References 29 publications

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“…A study [32] mentioned the results of a standalone EAHE system and suggests that it has great potential for providing pre-heating, pre-cooling, and natural ventilation of dwellings and buildings in arid regions. However, other studies suggest that using an EAHE system with an external fan can improve thermal comfort in hot arid regions as compared to one without a fan, but careful consideration must be given to humidity control [33], and the use of a fan provided the most significant control over the impact of external climatic conditions and resulted in a drying tendency [34]. Another study [35] investigated two scenarios using renewable techniques: an earth-to-air heat exchanger (EAHE) and a solar chimney (SC).…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation of Flow Uniformity in a Bank‐Type Earth‐Air Heat Exchanger

Goyal¹,

Asati²,

Arora³

2023

Chem Eng & Technol

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The airflow in earth‐air heat exchangers with different types of flow was examined at various inlet velocities. The results show that there is a significant variation in the mass flow rate of air through the holes for both induced and forced flow. The mass flow rate ranges from 0.013 to 0.119 kg s−1 for forced flow and from 0.018 to 0.128 kg s−1 for induced flow at a velocity of 4.1 m s−1. In contrast, the variation in the mass flow rate through the pipes is significant only for forced flow and almost negligible for induced flow. The mass flow rate ranges from 0.029 to 0.054 kg s−1 for forced flow and from 0.043 to 0.045 kg s−1 for induced flow at the same velocity, indicating that induced flow may be a valuable method for optimizing the earth‐air heat exchanger performance.

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Section: Introductionmentioning

confidence: 99%

Experimental Investigation of Flow Uniformity in a Bank‐Type Earth‐Air Heat Exchanger

Goyal¹,

Asati²,

Arora³

2023

Chem Eng & Technol

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“…Rodrí guez-Vá zquez et al [27] determined that the EAHE is highly suitable for dry climates, such as those present in northern Mexico, but not recommended for humid climates found in the southern and southeastern regions of the country. Previous investigations on EAHEs have examined various scenarios and diverse locations throughout Algeria, see Ahmad et al [28]; and Sakhri et al [29][30][31][32][33][34][35].…”

Section: Introductionmentioning

confidence: 99%

Numerical Assessment of EAHE Systems for Refreshment in Desert Algerian Regions

Nettari,

Kaddour,

Benbelgacem

et al. 2023

IJDNE

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As an example of green energy (geothermal energy), which has been the subject of advanced research in recent decades, the earth-to-air heat exchanger (EAHE) is the application of an air heat exchanger to soil temperatures, in which air circulates in tubes in thermal contact with the ground. The performance of the EAHE cooling system is evaluated at two separate sites (arid and semi-arid) in Algeria throughout this investigation. The impact of the EAHE system's entombed depth is then considered in this paper. According to our earlier research, the proper depth of the inhumed pipes is set at 3 m. The thermo-physical properties of the soil at several sites located in southern Algeria (Ghardaia: 32° 22′ 54′′ North, 3° 47′ 58′′ East) and Ouargla: 31° 55′ 53′′ North, 5° 24′ 24′′ East) are implemented by writing a program with the Scilab 6.0.2 software. Based on the results obtained, it can be concluded that the thermal range parameter is a more relevant and efficient parameter for evaluating the thermal performance of the EAHE (Earth-to-Air Heat Exchanger) system. Furthermore, the Ouargla region is a suitable location for the experimental realization of the EAHE system. The thermal amplitude interval (Trange) in Ouargla during the annual period is larger compared to Ghardaï a, with maximum values of 22.5℃ and 20℃ respectively. It is worth noting that the thermal comfort level (20-27℃) is more suitable for the Ouargla region rather than Ghardaï a. Additionally, there is an average difference of around 2.5℃ in the thermal amplitude between the two zones during the hot season, further highlighting the superiority of the Ouargla region.

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“…They reported that the optimized oval-tube outperforms the conventional circular-tube shape by approximately 13% and 15% in heat transfer rates, 9% and 13.5% in coefficients of performance (COP), and 13% and 16.6% in heat transfer coefficients for Re = 1030 and 2060, respectively. Moreover, other investigations by numerical and experimental treatments have been carried out by Sakhri et al [42][43][44], Chamkha et al [45], Boursas et al [46], Chekchek et al [47], Hadidi et al [48], Menni et al [49][50][51][52], Ahmad et al [53], Salmi et al [54], Ameur et al [55], Mahammedi et al [56], Maouedj et al [57], etc. Their studies suggested different models of heat exchangers in order to improve the performance under various limit conditions.…”

Section: Introductionmentioning

confidence: 99%

Numerical Investigation of Thermal-Flow Characteristics in Heat Exchanger with Various Tube Shapes

et al. 2021

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In this study, eight configurations of oval and flat tubes in annular finned-tube thermal devices are examined and compared with the conventional circular tube. The objective is to assess the effect of tube flatness and axis ratio of the oval tube on thermal-flow characteristics of a three-row staggered bank for Re (2600 ≤ Re ≤ 10,200). It has been observed that the thermal exchange rate and Colburn factor increase according to the axis ratio and the flatness, where O1 and F1 provide the highest values. O1 produces the lowest friction factor values of all the oval tubes at all Re, and F4 gives 13.2–18.5% less friction than the other tube forms. In terms of performance evaluation criterion, all of the tested tubes outperformed the conventional circular tube (O5), with O1 and F1 obtaining the highest values. The global performance criterion of O1 has been found to be 9.6–45.9% higher as compared to the other oval tube geometries at lower values of Re, and the global performance criterion increases with the increase in flatness. The F1 tube shape outperforms all the examined tube designs; thus, this tube geometry suggests that it be used in energy systems.

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Experimental study of the efficiency of earth-to-air heat exchangers: Effect of the presence of external fans

Cited by 22 publications

References 29 publications

Experimental Investigation of Flow Uniformity in a Bank‐Type Earth‐Air Heat Exchanger

Experimental Investigation of Flow Uniformity in a Bank‐Type Earth‐Air Heat Exchanger

Numerical Assessment of EAHE Systems for Refreshment in Desert Algerian Regions

Numerical Investigation of Thermal-Flow Characteristics in Heat Exchanger with Various Tube Shapes

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