The employment of an earth-to-air heat exchanger as pre-treating unit of an air conditioning system for energy saving: A comparison among different worldwide climatic zones

D’Agostino, Diana; Greco, Adriana; Masselli, Claudia; Minichiello, Francesco

doi:10.1016/j.enbuild.2020.110517

Cited by 37 publications

(15 citation statements)

References 55 publications

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“…In this paper, the EAHX is intended to be installed in the city of Naples (Italy), which has a typical Mediterranean climate. The study is conducted by means of a numerical two-dimensional model based on finite element method and experimentally validated [47]. The step of the investigation concerning the optimization of geometrical factors of the duct and air velocity is conducted by imposing the design parameters for cooling and heating operation modes prescribed by ASHRAE.…”

Section: Aim Of the Papermentioning

confidence: 99%

“…with C µ , that is one of the constants of the K-ε model for turbulent flow [47]. • the energy equation for the air flow:…”

Section: The Mathematical Systemmentioning

confidence: 99%

“…The model is solved through the finite element method applied to the domain meshed in free triangular elements; the dimension of the mesh has been chosen according to a grid independence study that has been the object of a previous investigation [47].…”

Section: The Mathematical Systemmentioning

confidence: 99%

“…The model has been experimentally validated in three case studies of horizontal ducts placed in three different countries (Algeria, Morocco, Egypt) and the maximum relative error between the experimental and the numerical data is 2.55%. Further details are reported in [47,52].…”

Section: The Mathematical Systemmentioning

confidence: 99%

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The Optimization of the Thermal Performances of an Earth to Air Heat Exchanger for an Air Conditioning System: A Numerical Study

Greco

Masselli

2020

Energies

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The aim of this paper is to research the parameters that optimize the thermal performances of a horizontal single-duct Earth to Air Heat eXchanger (EAHX). In this analysis, the EAHX is intended to be installed in the city of Naples (Italy). The study is conducted by varying the most crucial parameters influencing the heat exchange between the air flowing in the duct and the ground. The effect of the geometrical characteristics of the duct (pipe length, diameter, burial depth), and the thermal and flow parameter of humid air (inlet temperature and velocity) has been studied in order to optimize the operation of this geothermal system. The results reveal that the thermal performance increases with length until the saturation distance is reached. Moreover, if the pipe is designed with smaller diameters and slower air flows, if other conditions remain equal, the outlet temperatures come closer to the ground temperature. The combination that optimizes the performance of the system, carried out by forcing the EAHX with the design conditions for cooling and heating, is: D = 0.1 m s−1; v = 1.5 m s−1; L = 50 m. This solution could also be extended to horizontal multi-tube EAHX systems.

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Section: Aim Of the Papermentioning

confidence: 99%

“…with C µ , that is one of the constants of the K-ε model for turbulent flow [47]. • the energy equation for the air flow:…”

Section: The Mathematical Systemmentioning

confidence: 99%

Section: The Mathematical Systemmentioning

confidence: 99%

Section: The Mathematical Systemmentioning

confidence: 99%

See 2 more Smart Citations

The Optimization of the Thermal Performances of an Earth to Air Heat Exchanger for an Air Conditioning System: A Numerical Study

Greco

Masselli

2020

Energies

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“…Therefore, never as in this historic moment has it been so necessary to find ecocompatible refrigeration techniques that constitute a valid alternative to vapor compression refrigeration systems; so the scientific community has been called upon to research for finding new solutions, using renewable energy sources [17][18][19][20][21] or developing completely new-concept technologies (Not-In-Kind) for cooling and air conditioning [22][23][24]. Among them is the class of solid-state technologies based on caloric effects [25] which is currently considered a promising alternative to vapor compression [26,27] as it is characterized by the use of materials that have not a direct greenhouse effect (GWP = 0) [28].…”

Section: Introduction 1generalitiesmentioning

confidence: 99%

Numerical Optimization of a Single Bunch of NiTi Wires to Be Placed in an Elastocaloric Experimental Device: Preliminary Results

et al. 2021

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Italy has not yet presented to the scientific community any elastocaloric prototype suitable for refrigeration/air conditioning. The SUSSTAINEBLE project was born from the idea to build a demonstrative elastocaloric prototype for environmental conditioning. The prototype is planned to be rotary and composed by a few bunches of elastocaloric wires crossed by air as heat transfer fluid. Many are the parameters to be investigated before the realization of the device. A numerical practical tool would help to easily optimize the prototype. In this paper a two-dimensional tool of a single bunch of elastocaloric wires based on finite-element method is introduced; it can reproduce step by step the velocity and the pressure field of fluid to predict more accurately the solid-to-fluid heat exchange. The results of a test campaign mostly focused on the optimization of the frequency of the cycle, fluid velocity and the distance between the elastocaloric wires are presented. The results reveal that: (i) 0.12 Hz as frequency; (ii) 7 m s−1 as velocity; (iii) 1.0 mm as optimal wire distance, would better satisfy the trade-off existing in the maximization of temperature span and cooling power per mass unit: 23.7 K and 311.97 W kg−1 are the values achieved, respectively.

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Analysis of an earth‐to‐air heat exchanger for enhanced residential thermal comfort

Dewangan,

Shukla,

Salhotra

et al. 2024

Env Prog and Sustain Energy

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It is well known that a massive demand for thermal comfort has resulted in a sharp rise in energy use for residential space heating and cooling. This article presents numerical simulations of a room coupled with an earth‐to‐air heat exchanger system operating at the climatic condition of 21.2497° N, 81.6050° E for both summer and winter seasons. The present study involves an estimate of monthly variations in soil temperature at different depths and a suitable geometrical arrangement of pipe is proposed. The thermal performance of the earth‐to‐air heat exchanger system in terms of the outlet air temperature and effectiveness has been calculated. It is shown that with an effectiveness of 0.77 in summer and 0.78 in winter, the present EAHE system reduces the ambient air temperature from 38 to 28.2°C in the summer and it rises from 13 to 22.9°C in winter, respectively. Finally, an improvement in the thermal comfort condition of the room exposed to the solar radiation has been examined at different time intervals and different heights of the room. During the summer the room temperature dropped by 4.2°C while in winter it rose by 5.2°C. Furthermore, the environmental effects of system have been evaluated, showing energy savings of 3.90 kWh/day during summer and 4.83 kWh/day during winter leading to a decrease in CO2 emissions of 6.13 kg/day in summer and 7.59 kg/day in winter.

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The employment of an earth-to-air heat exchanger as pre-treating unit of an air conditioning system for energy saving: A comparison among different worldwide climatic zones

Cited by 37 publications

References 55 publications

The Optimization of the Thermal Performances of an Earth to Air Heat Exchanger for an Air Conditioning System: A Numerical Study

The Optimization of the Thermal Performances of an Earth to Air Heat Exchanger for an Air Conditioning System: A Numerical Study

Numerical Optimization of a Single Bunch of NiTi Wires to Be Placed in an Elastocaloric Experimental Device: Preliminary Results

Analysis of an earth‐to‐air heat exchanger for enhanced residential thermal comfort

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