A new idea for improving the horizontal straight ground source heat exchangers performance

Hassanzadeh, Rahim; Darvishyadegari, Mohsen; Arman, Samaneh

doi:10.1016/j.seta.2017.12.006

Cited by 17 publications

(10 citation statements)

References 11 publications

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“…Este trabalho apresenta simulações de TCSA a partir de dados climáticos da cidade de Viamão, Rio Grande do Sul, cujas coordenadas geográficas são (30 o 04' 51"S; 51 o 01' 24" O). Além do trocador, utilizou-se uma caixa galvanizada ao redor do duto, para aumentar a condutividade térmica do solo circundante, avaliando adaptações das ideias apresentadas em Hassanzadeh et al (2018). A fim de concluir qual o melhor tamanho para a caixa galvanizada, os autores dividiram a pesquisa em nove casos, onde a proporção da caixa variou de 10 a 90%.…”

Section: Metodologiaunclassified

Estudo da utilização de resíduos industriais e agroindustriais em compósitos de matriz cimentícia

Moreira¹,

Leite²,

Souza³

et al. 2022

Engenharia, Gestão E Inovação – Volume 6

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Section: Metodologiaunclassified

Estudo da utilização de resíduos industriais e agroindustriais em compósitos de matriz cimentícia

Moreira¹,

Leite²,

Souza³

et al. 2022

Engenharia, Gestão E Inovação – Volume 6

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“…The continuous circulation of hot water in the buried pipes inside the soil will cause a clear change in its temperature, especially those adjacent to the pipe, which negatively affects the efficiency of heat transfer and the thermal performance of the buried pipe. , When using shallow soils for cooling PVT systems, the working fluid must be non-toxic to the soil when it is drained. Therefore, pure water is usually used as a cooling fluid in these systems. , Parameters such as the heat exchanger inlet temperature and coolant flow rate play an influential role in the overall thermal performance of the system. , …”

Section: Introductionmentioning

confidence: 99%

Cooling of a PVT System Using an Underground Heat Exchanger: An Experimental Study

Majeed,

Abdul-Zahra,

Mutasher

et al. 2023

ACS Omega

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In the recent decades, the researchers have been focused on the use of photovoltaic thermal (PVT) systems that provide the best performance and cooling for the photovoltaic panels. In this study, a PVT system consisting of a monocrystalline PV panel and a spiral heat exchanger was connected to an underground heat exchanger that is buried at a depth of 4 m below the surface of the earth. The procedure of the current study can be considered the first of its kind in the Middle East and North Africa region (based on the researchers' knowledge). The study was carried out on agricultural land in Baghdad-Iraq during months of July and August-2022, which are considered the harshest weather conditions for this city. The heat exchanger consists of a copper tube with a length of 21 m and formed in the shape of 3U, and it was buried in the earth and connected with a PVT system. The results of the study showed that the site chosen to bury the heat exchanger (4 m deep) has a stable soil temperature at 22.5 °C. From various volumetric flow rates, a flow rate of 0.18 l/s was selected which is considered the highest flow rate that can show vibration in the PVT system which may harm the system. The practical measurements showed that the largest difference in the surface temperatures of standalone PV and PVT was around 20 °C in favor of the latter. The electrical efficiency of the studied PVT system also increased to outperform the standalone PV system by 127.3%. By comparing the results of the current study with studies of water-cooled PVT systems from the literature, it is clear that the proposed system is feasible and has an acceptable efficiency in such harsh weather conditions tested during the experiment.

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“…The method established by Hassanzadeh et al [9] shown that the applied heat transfer augmentation strategy was more effective for soils with a lower conductivity than those with a higher conductivity. The findings demonstrated that after the underground pipes of GSHEs are placed with galvanised bridges, the heat transfer capacity between the pipes and the ground improves significantly compared to standard GSHEs.…”

Section: Introductionmentioning

confidence: 99%

Experimental Analysis for the Performance of a Geothermal Heat Exchanger Made of Environmentally Friendly Materials

Al-Fatlwe¹,

Jabbar²,

Hamza³

et al. 2022

I2M

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Geothermal heat exchanger (GHE) technology is commonly used in residential and small non-residential buildings, and examples of innovative compact GHE designs are provided. The essential physical properties and processes involved in shallow GHE behavior are described, some of which may be more complex than those required for other types of GHE. This paper discusses the use of a geothermal heat exchanger to extract underground energy for heating and cooling systems and focuses specifically on designing a ground heat exchanger made of environmentally friendly materials suitable for working in the zone of Babylon Governorate in Iraq. At different burial depths, three systems of horizontal heat exchangers were designed. The heat exchanger was designed with pipes made of peroxide cross-linked polyethylene (PEX), in which the pipes were buried to a depth of 2 m under the soil. Also, another system was designed where the pipes are made of multi-layer composite pipe (Mlcp) at a burial depth of 2.5 m and another layer at a depth of 3 m. In this research, several tests were carried out to reach the conditions in which the ground heat exchanger is at its best performance. The effect of buried depth on heat removed from the space has been studied. This test was studying at a flow rate equal to (4 lpm) and the inlet temperature of water equal to approximately (50℃). The effect of changing the flow rates on heat removed from the ground heat transfer system is being studied. Buried depth of PEX pipes is 2m, inlet water temperature (50℃) is chosen as a case study to analyze this effect. The first experimental has shown the heat removed is equal to 2200.942 watts at 8.30 am when buried at a depth of 2m, while it reaches 3679.474 watts at a depth of 3 m. The results show the maximum coefficient of performance (COP) at (3 lpm) is 12.897 and it becomes 5.99 at 4 LPM. Also, the results show that the COP of PEX pipes can be higher than that of its counterparts when pipes are made from MLCp.

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A new idea for improving the horizontal straight ground source heat exchangers performance

Cited by 17 publications

References 11 publications

Estudo da utilização de resíduos industriais e agroindustriais em compósitos de matriz cimentícia

Estudo da utilização de resíduos industriais e agroindustriais em compósitos de matriz cimentícia

Cooling of a PVT System Using an Underground Heat Exchanger: An Experimental Study

Experimental Analysis for the Performance of a Geothermal Heat Exchanger Made of Environmentally Friendly Materials

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