Investigation of soil thermal saturation and recovery under intermittent and continuous operation of EATHE

Mathur, Anuj; Surana, Ankit Kumar; Verma, Poonam; Mathur, Sanjay; Agrawal, Ghanshyam Das; Mathur, Jyotirmay

doi:10.1016/j.enbuild.2015.10.010

Cited by 56 publications

(15 citation statements)

References 27 publications

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“…They also considered different types of soil and found that the intermittent operating system has better performance with a poor thermal conductivity of soil than the continuous mode. Intermittent operating cause the soil temperature and cooling capacity to be recovered among the soil layers by natural heat conduction [68]. In Misra at al.…”

Section: Literature Reviewmentioning

confidence: 99%

Techno-economic assessment and optimization of a hybrid renewable earth - air heat exchanger coupled with electric boiler, hydrogen, wind and PV configurations

2020

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Section: Literature Reviewmentioning

confidence: 99%

Techno-economic assessment and optimization of a hybrid renewable earth - air heat exchanger coupled with electric boiler, hydrogen, wind and PV configurations

2020

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“…As a matter of fact, although the dynamic soil temperature evolution is subtle due to the considerable thermal inertia of the surrounding soil, the ignorance of the temperature evolution will result in the prediction inaccuracy. According to the research results from the cooling application scenario [34], when the soil was located at 0.1 m from the tube wall along the radial direction, the temperature increased from 26.39 • C to 27.27 • C after 5-h continuous operation. The impact of the soil-temperature rise on the cooling performance of the UAT system is worthy to be investigated, whereas the current literature provides limited progress for the development of mathematical models with the temperature variation of dynamic surrounding soil.…”

Section: Introductionmentioning

confidence: 99%

“…In this paper, a dynamic model of a new UAT system was developed on the MATLAB/SIMULINK platform for the first time. Compared to the most common dynamic simulation method on CFD tools, such as Fluent, the MATLAB/SIMULINK platform is more flexible for multi-domain simulation, together with lower computational complexity for model-based design [34,40]. The MATLAB/SIMULINK platform has been utilized for heating ventilation and air conditioning (HVAC) system operation [41], building envelopes design [42], and hybrid solar heating systems [43].…”

Section: Introductionmentioning

confidence: 99%

Study on a Dynamic Numerical Model of an Underground Air Tunnel System for Cooling Applications—Experimental Validation and Multidimensional Parametrical Analysis

et al. 2020

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The underground air tunnel system shows promising potentials for reducing energy consumption of buildings and for improving indoor thermal comfort, whereas the existing dynamic models using the computational fluid dynamic (CFD) method show computational complexity and are user-unfriendly for parametrical analysis. In this study, a dynamic numerical model was developed with the on-site experimental calibration. Compared to the traditional CFD method with high computational complexity, the mathematical model on the MATLAB/SIMULINK platform is time-saving in terms of the real-time thermal performance prediction. The experimental validation results indicated that the maximum absolute relative deviation was 3.18% between the model-driven results and the data from the on-site experiments. Parametrical analysis results indicated that, with the increase of the tube length, the outlet temperature decreases with an increase of the cooling capacity whereas the increasing/decreasing magnitude slows down. In addition, the system performance is independent on the tube materials. Furthermore, the outlet air temperature and cooling capacity are dependent on the tube diameter and air velocity, i.e., a larger tube diameter and a higher air velocity are more suitable to improve the system's cooling capacity, and a smaller tube diameter and a lower air velocity will produce a more stable and lower outlet temperature. Further studies need to be conducted for the trade-off solutions between air velocity and tube diameter for the bi-criteria performance enhancement between outlet temperature and cooling capacity. This study proposed an experimentally validated mathematical model to accurately predict the thermal performance of the underground air tunnel system with high computational efficiency, which can provide technical guidance to multi-combined solutions through geometrical designs and operating parameters for the optimal design and robust operation.Energies 2020, 13, 1236 2 of 20 environmental concerns [4,5]. The contradiction between the daily increased energy demand and the energy shortage calls for the necessity to deploy renewable energy [6][7][8][9] and to reduce the dependence on fossil fuels. In order to reduce the reliance on traditional fossil fuels without sacrificing economic and social development, the deployment of large-scale renewable energy systems (such as heating, cooling, and electric systems) has become one of the most promising solutions to reduce the building energy consumption and to cover the building demand [10,11]. Depending on the renewable energy sources, the renewable energy systems can be classified into solar-driven [12][13][14][15][16][17], wind-driven, and geothermal-driven energy systems. Compared to the instability in temporal distribution and the unevenness in spatial distribution of solar and wind resources, the geothermal energy shows promising potentials in terms of the abundant resource distribution, the stability of energy supply, the simplicity of system designs and operations, and so on....

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“…It is clear that there is no need for the EAHX air cooling during these night hours. However, as suggested by Mathur et al [22], running the EAHX during night time, when ambient air temperature is lower than the soil temperature, may be used for soil temperature recovering. Furthermore, Fig.…”

Section: Description Of the Monitoring Proceduresmentioning

confidence: 99%

“…However, these guidelines do not take into account the effect of the meteorological temperature and solar radiation on the upper surface, nor of discontinuous airflow. A specific study on the thermal saturation and recovery of the soil under intermittent and continuous EAHX operation is performed by Mathur et al [22].…”

Section: Experimental Projects and Guidelinesmentioning

confidence: 99%

Experimental and numerical study of an earth-to-air heat exchanger for air cooling in a residential building in hot semi-arid climate

Khabbaz

Benhamou

Limam

et al. 2016

Energy and Buildings

109

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Experimental and numerical study of an earth-to-air heat exchanger for air cooling in a residential building in hot semi-arid climate, Energy and Buildings http://dx.doi.org/10. 1016/j.enbuild.2016.04.071 This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. 3 ABSTRACT This work deals with an experimental and numerical study of an Earth-to-Air Heat Exchanger (EAHX) for air cooling, connected to a residential building located in Marrakech (Morocco) which climate is a hot semi-arid one. The EAHX consists of three parallel PVC pipes of 72 m length each and 15 cm inside diameter, buried at 2.2-3.2 m depth. Each pipe is equipped with a fan, which blows treated air into the building. The experimental study consists of summer monitoring of the EAHX via measurements of air temperature and humidity throughout the exchanger, as well as at its inlet and outlet to the building for two fixed values of the airflow rate. The experimental results show that the EAHX is a good semipassive system for air refreshment, as the recorded blown air temperature into the building is quasi-constant at 25 °C with air humidity around 40%, even though the outside temperature reaches more than 40 °C. Furthermore, the reduction of daily and annual air temperature amplitudes is characterized by an exponential drop as a function of pipe length. The characteristic length is found to be around 20m and 70m respectively for the daily and annual air temperature amplitudes reduction. Moreover, it is shown that the design guidelines from literature cannot straightforwardly be applied to an EAHX which is subject to meteorological disturbance from the upper surface and/or which is not operated all year round, for which numerical simulation with a validated models remains necessary. 1 EXPERIMENTAL AND NUMERICAL STUDY OF AN EARTH-TO-AIR HEAT EXCHANGER FOR AIR COOLING INOn the other hand, dynamic simulations of the EAHX using TRNSYS software (TYPE 460) were performed with one pipe or three pipes continuously running. Good agreement was found between the simulation and experimental results. Simulation results show that the EAHX can perform a maximum drop of air temperature as high as 19.5 °C and 18.3 °C respectively for an EAHX with one and three pipes. The achieving specific cooling capacity is 58 W/m 2 (one pipe) and 55 W/m 2 (three pipes) obtained for air temperatures of 25 °C and 26 °C respectively, at the EAHX outlet and 44.6 °C at its inlet.

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Investigation of soil thermal saturation and recovery under intermittent and continuous operation of EATHE

Cited by 56 publications

References 27 publications

Techno-economic assessment and optimization of a hybrid renewable earth - air heat exchanger coupled with electric boiler, hydrogen, wind and PV configurations

Techno-economic assessment and optimization of a hybrid renewable earth - air heat exchanger coupled with electric boiler, hydrogen, wind and PV configurations

Study on a Dynamic Numerical Model of an Underground Air Tunnel System for Cooling Applications—Experimental Validation and Multidimensional Parametrical Analysis

Experimental and numerical study of an earth-to-air heat exchanger for air cooling in a residential building in hot semi-arid climate

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