Parametric study on thermal performance of earth-to-air heat exchanger used for cooling of buildings

Benhammou, M.; Draoui, Belkacem

doi:10.1016/j.rser.2014.12.030

Cited by 117 publications

(40 citation statements)

References 25 publications

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“…Bu çalışmada, PVC ve metal boru malzemesinden yapılmış ve aynı boyutlarda olan iki adet THID sistemi Harran Üniversitesi Osmanbey Yerleşkesi Makina Mühendisliği Bölümüne ait alan içinde 3 m derinlikte kurulmuştur. THID ile ilgili yapılan çalışmalarda genel olarak metal ve PVC borular kullanılmıştır [21][22][23]. Metal malzemeye göre PVC malzemesinin ısı iletim katsayısı daha düşük ve dış yüklere karşı daha az dayanıklıdır.…”

Section: Deneysel Yöntem (Experimental Method)unclassified

Farklı malzemelerin toprak – hava ısı değiştiricisinin (THID) ısıl performansına etkisinin incelenmesi

Bulut

Demirtaş²,

Beyazit³

2018

Gazi Üniversitesi Mühendislik-Mimarlık Fakültesi Dergisi

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Highlights:Graphical/Tabular Abstract  The effect of pipe materials used in the earth -air heat exchanger (EAHX) on thermal performance  The comparison of different materials in heating and cooling conditions  The effect of soil and outdoor temperatures with different materials on the thermal performance of EAHX The use of renewable energy sources in heating, cooling and ventilation applications increases and leads to reduce the energy consumption in buildings. Earth -Air Heat Exchanger (EAHX) systems utilize the thermal energy of the soil and can reduce energy use in buildings. In this study, the effect of different materials usage on EAHX systems was examined. The thermal performance of two EAHX systems using PVC and metal pipes at 3 m soil depth were investigated experimentally under Şanlıurfa climatic conditions. Figure A. Schematic drawing of the EAHX systemsPurpose: In this study, it is aimed to investigate the effect of different material usage on performance of EAHX systems. Theory and Methods:In this study, two EAHX systems made of PVC and metal pipe were established at a depth of 3 m in the area belonging to the Harran University. Duct type radial fans with the same specifications were used in both EAHX systems. Measurements were taken from the systems for one year and the analyses were made separately for the heating conditions (winter period) and the cooling conditions (summer period). Results:The temperature measurement results of EAHX systems in heating conditions were examined and it was understood that especially in the time interval of low outside temperature, the temperature of the metal pipe EAHX system is 1 or 2 o C higher than the other. In the June, July, August and September months, which were selected as the cooling season, it was seen that the metal pipe outlet temperature was about 5 o C lower than the PVC pipe outlet temperature in the time period of high outdoor temperature. Conclusion:It has been determined that the metal pipe EAHX system has better thermal performance than the EAHX system with PVC pipe. In addition, when the temperature difference between the outside air and soil is low, it is observed that the output temperatures of metal and PVC systems are very close to each other.

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Section: Deneysel Yöntem (Experimental Method)unclassified

Farklı malzemelerin toprak – hava ısı değiştiricisinin (THID) ısıl performansına etkisinin incelenmesi

Bulut

Demirtaş²,

Beyazit³

2018

Gazi Üniversitesi Mühendislik-Mimarlık Fakültesi Dergisi

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“…where the friction (f ) against the airflow for a smooth pipe can be estimated by Equation (10) [24].…”

Section: Earth-to-air Heat Exchanger Modelmentioning

confidence: 99%

“…Similarly, after a certain length, the heat transfer remains the same with an increase in the length of the pipe, this phenomenon is termed as saturation length. With an increase in airflow, the saturation length also increases [24]. Pipe length is the most influential variable that affects the thermal performance of the EAHE system [25].…”

Section: Introductionmentioning

confidence: 99%

Parametric Optimization of Earth to Air Heat Exchanger Using Response Surface Method

et al. 2019

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The achievement of sustainable energy goals warrants keen interest in promoting efficient buildings and renewable energy resources. Prominent among the energy-efficient building technologies is geothermal energy, which has a significant margin for improving energy utilization related to Heat, Ventilation, and Air Conditioning (HVAC). However, the efficient extraction of geothermal energy for HVAC applications requires stringent control of geometric parameters, boundary conditions, and environmental conditions. In this study a new approach has been devised to optimize the open loop Earth to Air Heat Exchanger (EAHE) system using a statistical optimization technique i.e., Response Surface Method (RSM). The study was conducted in the soil and weather conditions of Peshawar city in Pakistan. Parametric analysis was conducted for the three influencing variables, i.e., the pipe length, diameter, and air velocity using the EAHE model. The soil model predicts temperature in the range 20–26 °C for Peshawar at a depth above 3 m. Response Surface method was used to optimize the pipe length, diameter, and air velocity of the EAHE system. Analysis of Variance (ANOVA) indicates that all the three factors are significant. The EAHE system can effectively reduce the temperature by 15–18 °C and compensate the cooling load of single room for the parameters in the ranges of 50–70 m for the length, 0.18–0.25 m for the diameter, and 5–7 ms−1 for the air velocity. A regression equation is developed to predict the cooling load for any input values of the three influencing variables according to the weather and soil conditions.

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“…• A rise of 1.2°C was noticed in the ambient temperature and a drop of 31.6% in the daily mean efficiency was observed when the air velocity changed from 1 to 3 m/s [89] Algerian Sahara conditions i A pipe with 5 mm thickness was buried in soil with 22.27°C temperature.…”

Section: Ref Climatic Conditions Remarksmentioning

confidence: 99%

Review of passive heating/cooling systems of buildings

Gupta

Tiwari²

2016

Energy Science & Engineering

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In this review, an attempt has been made to analyze passive solar heating and cooling concepts along with their effects on performance of a building's thermal management. The concepts of Trombe wall, solarium, evaporative cooling, ventilation, radiative cooling, wind tower, earth air heat exchanger, roof pond, solar shading for buildings, and building-integrated photovoltaic thermal (BiPVT) systems are extensively covered in this review. Comparison of results by various heating and cooling concepts has been made. It has been observed that direct heating through double-glazed window saves maximum conventional fuel for thermal heating during winter months. Further, an evaporative cooling is one of the best cooling concepts which is economical too in summer period. 2

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Parametric study on thermal performance of earth-to-air heat exchanger used for cooling of buildings

Cited by 117 publications

References 25 publications

Farklı malzemelerin toprak – hava ısı değiştiricisinin (THID) ısıl performansına etkisinin incelenmesi

Farklı malzemelerin toprak – hava ısı değiştiricisinin (THID) ısıl performansına etkisinin incelenmesi

Parametric Optimization of Earth to Air Heat Exchanger Using Response Surface Method

Review of passive heating/cooling systems of buildings

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