Performance analysis of building-integrated earth-air heat exchanger retrofitted with a supplementary water system for cooling-dominated climate in Taiwan

Yang, Li-Hao; Hu, Jiun-Wei; Chiang, Yuan-Ching; Chen, Sih‐Li

doi:10.1016/j.enbuild.2021.110949

Cited by 14 publications

(3 citation statements)

References 43 publications

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“…It is represented as illustrated in Figure 2. Many studies studying GAHE systems under various climates and regions have been published [12]. Agrawal et al, [13] suggested that the earth tube heat exchanger ETHE must be kept at a depth of 3-4 m because temperature of the soil in depth more than 4m does not significantly change.…”

Section: Introductionmentioning

confidence: 99%

Thermal Performance of Earth Air Heat Exchanger for Geothermal Energy Application in Hot Climate using CFD Simulation

Faeza Mahdi Hadi,

Muntadher Hashim Abed,

Karrar Abed Hammoodi

2024

ARFMTS

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The Ground Air Heat Exchanger (GAHE) is a sustainable, environment friendly, and efficient device that can be used for both heating and cooling applications. Careful design of GAHE enables efficient exploit of the earth interior energy. The design of a GAHE relies on the constant temperature of the earth interior which allows consistent and reliable source of geothermal energy. By harnessing this renewable energy, a sustainable solution for heating and cooling needs is attained while minimizing the impact on environment. In this study, the performance of GAHE was examined using ANSYS Fluent 19 R1 and SOLID WORK 16.0 software. The efficiency and Coefficient of Performance (COP) of the ETHE have been investigated. The effect of air flow rate and operation conditions on the outlet air temperature have been studied. GAHE is made of Polyvinyl Chloride (PVC) pipe of 0.1 m diameter, 0.005 m thickness and 18 m horizontal length. Computer simulations were carried out for five different air velocities (1, 2, 3, 4, and 5 m/s) at various operation conditions. Results show that the 18 m pipe length is adequate to attain useful air outlet temperature giving COP values between 0.5 and 1.3. The length of the horizontal part of GAHE can be further increased for air velocities between 3 and 5 m/s. Comparison between the results obtained by the CFD model and experimental work demonstrated that the CFD model is capable of producing results with acceptable accuracy. This suggests that the CFD software can accurately model the performance of the GAHE under different operation conditions. Increasing the length of the horizontal part of the GAHE can improve its COP when higher air velocities are used.

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Section: Introductionmentioning

confidence: 99%

Thermal Performance of Earth Air Heat Exchanger for Geothermal Energy Application in Hot Climate using CFD Simulation

Faeza Mahdi Hadi,

Muntadher Hashim Abed,

Karrar Abed Hammoodi

2024

ARFMTS

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“…Various EAHE models aim to increase P t and θ, considering factors like location, air temperature, humidity, soil composition, solar radiation, and operating parameters [7]. Hybrid systems that combine EAHE with other technologies have also been explored [8][9]. One challenge for horizontal ducts in urban areas is the limited physical space, but solutions have been proposed [10][11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Maximizing Efficiency of Earth-Air Heat Exchangers with Galvanized Blocks

Domingues

Ramalho

Fernando

2023

DDF

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Earth-air heat exchangers (EAHE) consist of buried ducts and a ventilation system, which require minimal electricity, making them a cost-effective and sustainable solution for improving the thermal conditions of built environments. To enhance the efficiency of the EAHE system and optimize its use of the soil's thermal potential, we employed a galvanized block with a cross-sectional area of 1.5 m2 around the duct. The simulations conducted in this study used climatic data from Viamão, a city in southern Brazil, and demonstrated the effectiveness of this strategy. The galvanized block increased the thermal conductivity of the soil region and enabled the EAHE system to utilize higher quantities of thermal energy. The first part of the work highlights the importance of block coupling in improving thermal efficiency and the two potentials of EAHE systems. We also introduce a new method for calculating EAHE efficiency throughout the year. We name it maximum efficiency because it measures how much thermal potential an EAHE installation can extract from the highest amount available in the soil during the year. Subsequently, we conducted simulations of ducts at different depths to evaluate their performance. Our results showed that annual efficiencies increased significantly with the addition of the galvanized block. We also found how the installation depth impacts the thermal potentials. Specifically, we obtained almost 4.0°C and 3.8°C for the (annual RMS) soil and EAHE thermal potentials, respectively, at 3.5m.

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“…In the paper [4], the review of the heat recovery methods in ventilation was presented as a way to diminish energy demand for heating the buildings. Another of the possibilities of reducing primary energy consumption by mechanical ventilation systems is the use of earth-to-air heat exchangers (EAHEs), which has been shown in many works, e.g., in a review article [5] or in more detailed works about supporting ventilation systems by means of ground heat exchangers, e.g., [6][7][8] or mechanical analysis about improving the efficiency of EAHEs, e.g., [9,10]. Building heating systems that use renewable energy sources, such as heat pumps, achieve the highest efficiency in cooperation with low-temperature heaters.…”

Section: Introductionmentioning

confidence: 99%

Peak Power of Heat Source for Domestic Hot Water Preparation (DHW) for Residential Estate in Poland as a Representative Case Study for the Climate of Central Europe

Amanowicz

2021

Energies

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Due to the energy transformation in buildings, the proportions of energy consumption for heating, ventilation and domestic hot water preparation (DHW) have changed. The latter component can now play a significant role, not only in the context of the annual heat demand, but also in the context of selecting the peak power of the heat source. In this paper, the comparison of chosen methods for its calculation is presented. The results show that for contemporary residential buildings, the peak power for DHW preparation can achieve the same or higher value as the peak power for heating and ventilation. For this reason, nowadays the correct selection of the peak power of a heat source for DHW purposes becomes more important, especially if it uses renewable energy sources, because it affects its size and so the investment cost and economic efficiency. It is also indicated that in modern buildings, mainly accumulative systems with hot water storage tanks should be taken into account because they are less sensitive to design errors (wrongly selected peak value in the context of the uncertainty of hot water consumption) and because they result in acceptable value of peak power for DHW in comparison to heating and ventilation.

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Performance analysis of building-integrated earth-air heat exchanger retrofitted with a supplementary water system for cooling-dominated climate in Taiwan

Cited by 14 publications

References 43 publications

Thermal Performance of Earth Air Heat Exchanger for Geothermal Energy Application in Hot Climate using CFD Simulation

Thermal Performance of Earth Air Heat Exchanger for Geothermal Energy Application in Hot Climate using CFD Simulation

Maximizing Efficiency of Earth-Air Heat Exchangers with Galvanized Blocks

Peak Power of Heat Source for Domestic Hot Water Preparation (DHW) for Residential Estate in Poland as a Representative Case Study for the Climate of Central Europe

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