Heat and mass transfer performance analysis and cooling capacity prediction of earth to air heat exchanger

Niu, Fuxin; Yu, Yuebin; Yu, Daihong; Li, Haorong

doi:10.1016/j.apenergy.2014.10.008

Cited by 114 publications

(35 citation statements)

References 16 publications

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“…The supply air temperature is in the range of 19 18-27 ºC during the period. According to the comparison between the tested and simulated 20 supply air temperature, the error at the beginning phase is a little big. During the simulation 21 process the initial ground soil temperature in computing domain is assumed the same.…”

mentioning

confidence: 97%

“…This study focuses on the investigation of soil thermal properties under different operation 29 strategies in short term when the soil temperature has generally very small variation [20]. The The tube along with x direction (horizontal) is divided into N elements and the length of each 12 element is x ∆ .…”

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confidence: 99%

“…Paepe and Janssens proposed a one-dimensional analytical method to analyze the 19 influence of the design parameters of the heat exchanger on the thermo-hydraulic performance. 20 The specific pressure drop and linking thermal effectiveness with pressure drop of the air inside 21 the tube were derived to obtain design-map finally [5]. In general, analytical solution is difficult 22 to achieve and also is gained based on lots of assumptions.…”

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confidence: 99%

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Investigation on soil thermal saturation and recovery of an earth to air heat exchanger under different operation strategies

Niu

2015

Applied Thermal Engineering

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Investigation on soil thermal saturation and recovery of an earth to air heat exchanger under different operation strategies

Niu

2015

Applied Thermal Engineering

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“…The mathematical model, calibrated by using experimental data [62], follows the same assumptions: the HAGHE has a uniform cross-section area, the ground properties are isotropic, a perfect contact exists between the tube and the ground, thermal resistance due to tube thickness is negligible, air is incompressible and its thermal properties are constant, and the air is well mixed in the tube without temperature stratification.…”

Section: Ground Tube Model Descriptionmentioning

confidence: 99%

Horizontal Air-Ground Heat Exchanger Performance and Humidity Simulation by Computational Fluid Dynamic Analysis

et al. 2016

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Improving energy efficiency in buildings and promoting renewables are key objectives of European energy policies. Several technological measures are being developed to enhance the energy performance of buildings. Among these, geothermal systems present a huge potential to reduce energy consumption for mechanical ventilation and cooling, but their behavior depending on varying parameters, boundary and climatic conditions is not fully established. In this paper a horizontal air-ground heat exchanger (HAGHE) system is studied by the development of a computational fluid dynamics (CFD) model. Summer and winter conditions representative of the Mediterranean climate are analyzed to evaluate operation and thermal performance differences. A particular focus is given to humidity variations as this parameter has a major impact on indoor air quality and comfort. Results show the benefits that HAGHE systems can provide in reducing energy consumption in all seasons, in summer when free-cooling can be implemented avoiding post air treatment using heat pumps.

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“…It was shown that the thermal resistance of the pipe wall and the contact resistance at the pipe-soil interface substantially reduced heat flow. Niu, et al [7] developed a one-dimensional steady-state control volume model and results were used to develop a regression model for predicting the sensible, latent and total cooling capacities of an EAHX. Bansal and Mathur [8] developed a thermal model to investigate the potential of an EAHX integrated with an evaporative cooler.…”

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confidence: 99%

Dynamic thermal simulation of horizontal ground heat exchangers for renewable heating and ventilation of buildings

Gan

2017

Renewable Energy

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Gan, Guohui (2016) Dynamic thermal simulation of horizontal ground heat exchangers for renewable heating and ventilation of buildings. Renewable Energy, 103 . pp. 361-371. ISSN 1879-0682 Access from the University of Nottingham repository: http://eprints.nottingham.ac.uk/38978/1/AcceptedManuscript.pdf Copyright and reuse:The Nottingham ePrints service makes this work by researchers of the University of Nottingham available open access under the following conditions. This article is made available under the Creative Commons Attribution Non-commercial No Derivatives licence and may be reused according to the conditions of the licence. For more details see: http://creativecommons.org/licenses/by-nc-nd/2.5/ A note on versions:The version presented here may differ from the published version or from the version of record. If you wish to cite this item you are advised to consult the publisher's version. Please see the repository url above for details on accessing the published version and note that access may require a subscription. Abstract: A ground heat exchanger is used to transfer thermal energy stored in soil in order to provide renewable heating, cooling and ventilation of a building. A computer program has been developed for simulation of the dynamic thermal performance of horizontally coupled earth-liquid heat exchanger for a ground source heat pump and earth-air heat exchanger for building ventilation. Neglecting the dynamic interactions between a heat exchanger and environments would significantly over predict its thermal performance and in terms of the amount of daily heat transfer the level of over-prediction could be as much as 463% for an earth-liquid heat exchanger and more than 100% for an earth-air heat exchanger. The daily heat transfer increases with soil moisture and for an earth-liquid heat exchanger the increase is between 3% and 35% with increase in moisture from 0.22 to 0.3 m 3 /m 3 depending on the magnitude of heat transfer. Heat transfer through a plastic earth-liquid heat exchanger can be increased by 10% to 12% if its thermal properties are improved to the same as surrounding soil. The increase is smaller between 2% and 4% for an earth-air heat exchanger. In addition, an earth-liquid heat exchanger is more efficient than an earth-air heat exchanger. Abbreviations HX heat exchanger EAHX earth-air heat exchanger EATV earth-air tunnel ventilation ELHX earth-liquid heat exchanger GSHP ground source heat pump

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Heat and mass transfer performance analysis and cooling capacity prediction of earth to air heat exchanger

Cited by 114 publications

References 16 publications

Investigation on soil thermal saturation and recovery of an earth to air heat exchanger under different operation strategies

Investigation on soil thermal saturation and recovery of an earth to air heat exchanger under different operation strategies

Horizontal Air-Ground Heat Exchanger Performance and Humidity Simulation by Computational Fluid Dynamic Analysis

Dynamic thermal simulation of horizontal ground heat exchangers for renewable heating and ventilation of buildings

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