Impact of soil moisture on the long-term energy performance of an earth-air heat exchanger system

Lin, Jianguo; Nowamooz, Hossein; Braymand, Sandrine; Wolff, Patrice; Fond, Christophe

doi:10.1016/j.renene.2018.06.106

Cited by 46 publications

(26 citation statements)

References 27 publications

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“…The difference in evapotranspiration between the oasis and the desert should be a crucial factor affecting the oasis effect. Soil moisture determines the partition of surface energy (Feldman et al, 2019; Lin et al, 2020; Purdy et al, 2018). Besides, soil moisture variations between oasis and desert controlled the difference in evapotranspiration between them.…”

Section: Discussionmentioning

confidence: 99%

Soil moisture influenced the variability of air temperature and oasis effect in a large inland basin of an arid region

Hao

Zhang

2021

Hydrological Processes

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Soil moisture plays a significant role in land‐atmosphere interactions. Changing fractions of latent and sensible heat fluxes caused by soil moisture variations can affect near‐surface air temperature, thus influencing the oasis's cooling effect in arid regions. In this study, the framework for the evaporative fraction (EF) dependence on soil moisture is used to analyse the impacts of soil moisture variation on near‐surface air temperature and the oasis effect. The result showed that soil moisture's contribution rate to EF was significantly higher than that of EF to temperature. Under the interaction of temperature sensitivity to EF and EF to soil moisture, the ∂T/∂ϴ presented a similar tempo‐spatial variation with both of the above. It was most significant in oasis areas during summer (−1.676), while it was weaker in plain desert areas during the autumn (−0.071). In the study region, the effect of soil moisture variation on air temperature can reach 0.018–0.242 K for different land‐cover types in summer. The maximum variation of soil moisture in summer can alter air temperature by up to 0.386 K. The difference in temperature variability between the oasis and desert areas promoted the formation of the oasis effect. For different oasis, the multi‐year average oasis cold effect index (OCI) ranged from −1.36 to −0.26 K. In comparison, the average summer OCI ranged from −1.38 to −0.29 K. The lower bound of the cooling effect of oasis ranged from −4.97 to −1.69 K. The analysis framework and results of this study will provide a new perspective for further research on the evolution process of the oasis effect and water–heat balance in arid areas.

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Section: Discussionmentioning

confidence: 99%

Soil moisture influenced the variability of air temperature and oasis effect in a large inland basin of an arid region

Hao

Zhang

2021

Hydrological Processes

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“…The optimum combination suggests large duct length (97 m), whereas small should be duct diameter (0.15 m) and air flow velocity (0.7 m s -1 ). A good compromise between performances and cost for burial depth could be 3.2 m. Furthermore, in 2020, a one-dimensional model was used by Lin et al [26] to quantify the correlation between the moisture of the ground and the log-term energy performances of an earth-to-air heat exchanger. Three different cases were considered: partially and fully saturated, fully dry.…”

Section: State-of-the Art Research Gap and Goal Of The Papermentioning

confidence: 99%

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

Greco

Masselli

et al. 2020

Energy and Buildings

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Highlights Earth-to-Air Heat eXchanger uses geothermal energy for air conditioning systems. A 2D mathematical model of the EAHX is developed to obtain the system performance. A case study office building is analysed for eight worldwide localities. Air temperature variation along the EAHX and EAHX efficiency are calculated. Reduction of thermal capacity of the coils inside air handling unit is evaluated.

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“…The results from the EAHE model proposed in this study are compared to the experimental data of an EAHE installed on the IUT Robert Schuman geothermal platform (University of Strasbourg), including the meteorological data [8]. The procedure of model identication and boundary conditions are explains and details in [7].…”

Section: Validationmentioning

confidence: 99%

“…Such energy system is particularly suitable for contrasting climates, either for preheating [5], or for cooling [6]. This energy system is also suitable for temperate climates such as [7], [8] and [9]. The use of an EAHE and its energy performance are highly dependent on climatic conditions [10].…”

Section: Introductionmentioning

confidence: 99%

Multi-criteria optimization of an earth-air heat exchanger for different French climates

et al. 2020

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The Earth-Air Heat Exchanger (EAHE) is a system for cooling or preheating the blown air into a building. A modeling of this system is proposed from a model for the ground and a model for the exchanger. The results are in agreement between the outside air temperature of the numerical model and the experimental temperature measurements. A sensitivity analysis with factorial plans is carried out to determine the most impactful parameters, taking into account two energy criteria and one economic criterion. The results show that tube radius, tube length, air velocity, burial depth and soil nature are the most impactful parameters. A multi-criteria optimization study with genetic algorithms is then performed to determine the Pareto front. The criteria do not evolve in the same trend because when the cost of the energy recovered decreases, the coecient of performance and the EAHE eciency will deteriorate, and reciprocally. Finally, a multiple-criteria decision-making is carried out using the TOPSIS method to provide the optimal pipe conguration.The optimal solution provides a large tube length, an intermediate burial depth, and a small air velocity and tube radius. The EAHE can achieve strong energy performance in any French climate.

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Impact of soil moisture on the long-term energy performance of an earth-air heat exchanger system

Cited by 46 publications

References 27 publications

Soil moisture influenced the variability of air temperature and oasis effect in a large inland basin of an arid region

Soil moisture influenced the variability of air temperature and oasis effect in a large inland basin of an arid region

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

Multi-criteria optimization of an earth-air heat exchanger for different French climates

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