Transient analysis based determination of derating factor for Earth Air Tunnel Heat Exchanger in winter

Misra, Rohit; Bansal, Vikas; Agrawal, Ghanshyam Das; Mathur, Jyotirmay; Aseri, Tarun Kumar

doi:10.1016/j.enbuild.2012.12.002

Cited by 34 publications

(13 citation statements)

References 31 publications

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“…Results obtained from CFD-based package software were compared with a numerical study conducted by Misra et al [22] and it was determined that there was a consistency between the results. The numerical study of Misra et al [22] was analyzed by using the standard k-ε turbulence model in steady-state condition of the package software. The physical and thermal properties of the numerical model of Misra et al [22] are presented in tab.…”

Section: Comparison With Literaturementioning

confidence: 99%

A numerical study on heating performance of horizontal and vertical earth-air heat exchangers with equal pipe lengths

Taşdelen

Dagtekin

2022

THERM SCI

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In this study, heating performances of horizontal and vertical earth-air heat exchangers with equal pipe lengths were evaluated in ANSYS FLUENT 19.2 simulation program based on CFD for the winter period of Bitlis, Turkey. Thermal per?formance analyses regarding vertical and horizontal 3-D-modeled earth-air heat exchangers were evaluated in steady-state condition of the simulation program for different values of Re = 5?103, 104, 2?104, 4?104, 6?104, 8?104, and 105 numbers by using standard k-? turbulence model. Numerical results obtained from CFD based simulation program were compared with a numerical study in the literature, and it was determined that there was a consistency between the results. The pressure loss and fan power values of horizontal and vertical earth-air heat exchangers were also investigated in addition their thermal performances. A good agreement was found between the pressure loss values obtained from the theoretical and simulation calculations of both earth-air heat exchangers. Considering the temperature increases in both earth-air heat exchangers, the highest and lowest temperature increases were observed in vertical earth-air heat exchanger with 22.52 K and 10.67 K, respectively. The best thermal performance was observed in vertical earth-air heat exchanger for 5?103, 104, and 2?104 values of Reynolds number and in horizontal earth-air heat exchanger for 4?104, 6?104, 8?104, and 105 values of Reynolds number.

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Section: Comparison With Literaturementioning

confidence: 99%

A numerical study on heating performance of horizontal and vertical earth-air heat exchangers with equal pipe lengths

Taşdelen

Dagtekin

2022

THERM SCI

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“…Hollmuller 30 developed an analytical solution for heat diffusion of EAHE system with a harmonic inlet air temperature, cylindrical pipe, and adiabatic or isothermal boundary condition. The influence of soil moisture, type, and thermal properties demonstrated on heat transfer of buried vertical pipes by Li et al 31 The effect of Reynolds number, form factor, and pipe depth on the outlet air temperature was investigated by Sehli et al 32 Misra et al 33 and Bansal et al 34 studied the impact of soil thermal conductivity, and the duration of continuous operation of the EAHE.…”

Section: Literature Reviewsmentioning

confidence: 99%

Techno‐economic analysis and energy performance of a geothermal earth‐to‐air heat exchanger (EAHE) system in residential buildings: A case study

Mostafaeipour

Goudarzi

Khanmohammadi

et al. 2021

Energy Science & Engineering

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Natural air ventilation in the hot‐dry regions plays a key role to decrease indoor air temperature in hot season, also to improve thermal comfort during the cold season. One of the most common ways to take advantage of natural ventilation is using wind catcher with an underground tunnel. In this method, the tower catches the airflow and directs it to the underground tunnel to decrease the air temperature by transferring heat to the ground, which is cooler in the summer and warmer in the winter. Earth‐to‐air heat exchanger (EAHE) is a modern form of wind catcher with underground tunnel. In this method, air after passing through buried pipes exchanges heat with the ground, and its temperature increases in the winter and decreases during the summer. This study analyzes the energy performance and cost‐effectiveness of earth‐to‐air heat exchanger to be utilized in a residential building in climate condition of the province of Kermanin Iran. In this regard, 9 different configurations of the EAHE are investigated to find the optimized EAHE. The system performance and cost‐effectiveness are studied in 3 different depths including 1, 2, and 3 m with 3 different pipe lengths including 25, 50, and 75 m. The results show that the EAHE is capable of reducing the inlet air temperature by 0.5‐9.9℃ in the summer and increasing it by 0.9‐11.2℃ in the winter. Furthermore, by integrating the EAHEs in a building design, one can reduce the total annual cooling load by 1.25%‐3.97% and for heating by 1.34%‐3.96%. The payback period of the system with a pipe length of 25 m is 16 years, but for the systems with pipe lengths of 50 and 75 m, this period reduces to almost 3 years.

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“…Şekil 2. Simülasyonda kullanılan Toprak & Hava Isı değiştiricisi modelinin şematik çizimi , [8] Yazın sıcak ve kurak bölgelerdeki toprağın birkaç metre altındaki sıcaklık değeri toprak yüzeyinin günlük ortalama sıcaklık değerinin altındadır ve gündüzki ortalama değerin çok altındadır [9]. Bundan dolayı dışarıdaki ılıman havayı soğutmak için ısı emici olarak kullanılabilir.…”

Section: Toprak and Hava Isı Değiştiricisiunclassified

Güneş Bacası ve Toprak Hava Isı Değiştiricisi Hibrid Sisteminin Pasif Soğutma Amaçlı Kullanılması

Kalkan

2016

Bitlis Eren Üniversitesi Fen Bilimleri Dergisi

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ÖzetBu çalışmada, daha önce yapılan deneysel ve bilgisayar destekli çalışmalar göz önüne alınarak yeni bir Güneş bacası sistemi Elazığ iklim şartları için tasarlanmıştır. Bugüne kadar yapılan çalışmalarda bazı eksiklikler göze çarpmaktadır bunların giderilmesi için bilgisayar destekli analize ağırlık verilmiştir. Örneğin, mimari açıdan kullanılan materyaller Computational Fluid Dynamic (CFD) Fluent ortamında tekrar düzenlenerek yeniden incelenmiştir. Ayrıca, sistemin bilgisayar tabanlı analizi yapılarak ve deneysel verilerden elde edilen değerlerle kıyaslanarak verimin artırılması sağlanmıştır. Soğutma kapasitesinin artırılması adına birçok yöntem bulunmaktadır. Bu çalışmada ise Güneş bacası ve Toprak & Hava Isı Değiştiricisi aynı anda kullanılarak sistemin iki farklı koldan soğutulması sağlanmıştır. Çalışmamızın sonundaki amacımız, bilgisayar ortamında modelleyeceğimiz hibrit sistemin en verimli şekilde çalışmasını sağlayabilmek, soğutma kapasitesini artırabilmek ve günümüzde kullanılan binalara uygulanabilir hale getirmektir.Anahtar Kelimeler Güneş Bacası, Toprak Hava Isı Değiştiricisi, Pasif Soğutma Sistemleri. Passive Cooling Technology by Using Solar Chimney and Earth to Air Heat Exchanger Hybrid Systems AbstractThis study describes the design and analysis of a new solar chimney system for Elazığ climatic conditions. In order to improve the performance of solar chimney system, one of the computer-aided analysis systems is that Computational Fluid Dynamic (CFD) fluent is used to demonstrate the structures of these systems and finally compare the results with several examples, which have been studied experimentally and carried out previously. There are numerous methods to assist this cooling technique, and in the present study the use of solar chimney together with earth to air heat exchanger is introduced. The general purpose of the research is to understand how efficiently the hybrid system generates cooling, and is to improve the efficient of such systems for integration with existing and future domestic buildings.

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Transient analysis based determination of derating factor for Earth Air Tunnel Heat Exchanger in winter

Cited by 34 publications

References 31 publications

A numerical study on heating performance of horizontal and vertical earth-air heat exchangers with equal pipe lengths

A numerical study on heating performance of horizontal and vertical earth-air heat exchangers with equal pipe lengths

Techno‐economic analysis and energy performance of a geothermal earth‐to‐air heat exchanger (EAHE) system in residential buildings: A case study

Güneş Bacası ve Toprak Hava Isı Değiştiricisi Hibrid Sisteminin Pasif Soğutma Amaçlı Kullanılması

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