A one-dimensional transient analytical model for earth-to-air heat exchangers, taking into account condensation phenomena and thermal perturbation from the upper free surface as well as around the buried pipes

Cucumo, Mario Antonio; Cucumo, S.; Montoro, Lino; Vulcano, Antonio

doi:10.1016/j.ijheatmasstransfer.2007.05.006

Cited by 85 publications

(15 citation statements)

References 18 publications

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“…Due to the improvement in numerical technique various researchers tried to explore the effect of various design, operating and geographical parameters on to the thermal performance of EATHE, such as effect of the pipe length, radius, depth and air flow rate (Huijun et al, 2007), installed depth variation (Cucumo et al, 2008). Further, effects of ground temperature gradient, surface conditions, moisture content, have also been identified as important design aspects of earth air tunnel heat exchanger (Kumar et al, 2003), along with effect of length, radius of pipe and air mass flow rate (Sodha et al, 1993) on the cooling potential of an underground air pipe system.…”

Section: Introductionmentioning

confidence: 99%

Transient effect of soil thermal diffusivity on performance of EATHE system

et al. 2015

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a b s t r a c tThis paper presents effect of thermo-physical properties of soil on performance of an Earth Air Tunnel Heat Exchanger (EATHE). The analysis has been carried out using a validated three-dimensional, transient numerical model for three different types of soil. The governing equations, based on the k-ε model and energy equation were used to describe the turbulence and heat transfer phenomena, are solved by using finite volume method. Comparisons were made in terms of temperature drop, heat transfer rate and COP of the EATHE system by operating it continuously for 12 h duration. The study reveals that each soil exhibits different rate of heat dissipation and thermal saturation over a period of continuous operation, which adversely affects the performance of EATHE. Dissipation of heat from the EATHE pipes to its surrounding soil and subsequently to the outer subsoil region is mainly found to be depending upon the thermal conductivity of soil; even of their thermal diffusivity is of different order.

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Section: Introductionmentioning

confidence: 99%

Transient effect of soil thermal diffusivity on performance of EATHE system

et al. 2015

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“…There are many papers focused on the issue of mathematical modelling of EAHEs operation [10][11][12][13][14][15][16][17][18][19][20]. Majority of mentioned take into account one-pipe structures of exchangers and focus attention on EAHEs thermal performance.…”

Section: Multi-pipe Earth-to-air Heat Exchangersmentioning

confidence: 99%

Experimental investigation and CFD simulation of multi-pipe earth-to-air heat exchangers (EAHEs) flow performance

Amanowicz

Wojtkowiak

2017

E3S Web Conf.

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Abstract. In this paper the experimentally obtained flow characteristics of multi-pipe earth-to-air heat exchangers (EAHEs) were used to validate the EAHE flow performance numerical model prepared by means of CFD software Ansys Fluent. The cut-cell meshing and the k- realizable turbulence model with default coefficients values and enhanced wall treatment was used. The total pressure losses and airflow in each pipe of multi-pipe exchangers was investigated both experimentally and numerically. The results show that airflow in each pipe of multi-pipe EAHE structures is not equal. The validated numerical model can be used for a proper designing of multi-pipe EAHEs from the flow characteristics point of view. The influence of EAHEs geometrical parameters on the total pressure losses and airflow division between the exchanger pipes can be also analysed. Usage of CFD for designing the EAHEs can be helpful for HVAC engineers (Heating Ventilation and Air Conditioning) for optimizing the geometrical structure of multi-pipe EAHEs in order to save the energy and decrease operational costs of low-energy buildings.

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“…Kumar et al [5] relied on genetic algorithm (GA) optimization tools for design applications and soft computing methods. Cucomo et al [6] proposed a onedimensional transient analytical model to estimate the performance of systems installed at different depths.…”

Section: Introductionmentioning

confidence: 99%

Validating Models for Calculating the Efficiency of Earth-to-Air Heat Exchangers Based on Laboratory Data for Fall and Winter 2016 in Northeastern Poland

Skotnicka-Siepsiak¹,

Wesołowski²,

Piechocki³

2019

Pol. J. Environ. Stud.

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Contemporary energy-saving mechanical ventilation systems combined with Earth-Air Heat Exchangers (EAHE) can reach high energetic and economic efficiency. The necessary condition for optimisation of ventilation system functioning is the adequate design of EAHE. This requires knowledge of soil temperature distribution in the location of EAHE. It constitutes a complex problem because of the influence of different factors. The correct estimation of soil temperature for a given location can be difficult in the designing process. The designers can rely on simplified calculation models which can, however, deviate from real empirical data. The motivation to undertake this study was to compare real, empirical energy gains with handly calculations based on two different theoretical models of soil temperature distribution. The theoretical models used for comparison were European norm and semi empirical. The laboratory setting including EAHE was located at Warmia and Mazury University in Olsztyn, Poland. Thus it can reflect real condition operations of EAHE in climate conditions of central Eastern Europe. Data were gathered in a winter period between 1 October and 31 December. The results indicate that empirical data deviate from theoretical models. Models tended to overestimate the energy gains from EAHE by 23%.Keywords: earth-to-air heat exchanger, models for calculating the thermal efficiency of earth-to-air heat exchangers *

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A one-dimensional transient analytical model for earth-to-air heat exchangers, taking into account condensation phenomena and thermal perturbation from the upper free surface as well as around the buried pipes

Cited by 85 publications

References 18 publications

Transient effect of soil thermal diffusivity on performance of EATHE system

Transient effect of soil thermal diffusivity on performance of EATHE system

Experimental investigation and CFD simulation of multi-pipe earth-to-air heat exchangers (EAHEs) flow performance

Validating Models for Calculating the Efficiency of Earth-to-Air Heat Exchangers Based on Laboratory Data for Fall and Winter 2016 in Northeastern Poland

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