Outlet temperatures of a slinky-type Horizontal Ground Heat Exchanger with the atmosphere-soil interaction

Tang, Fujiao; Nowamooz, Hossein

doi:10.1016/j.renene.2019.07.029

Cited by 50 publications

(19 citation statements)

References 45 publications

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“…It is assumed that 10% of the precipitation runs off and the other evaporates or infiltrates into the ground. E can be calculated by the following equation (Monteith, 1965;Chen and Buchberger, 2018;Tang and Nowamooz, 2020):…”

Section: Atmosphere-hghe-soil Interactionmentioning

confidence: 99%

“…where E e denotes the evaporation potential, mm/s. This can be performed by the Penman-Monteith model, and the average air humidity is set as 0.80 in this paper (Monteith, 1965;Tang and Nowamooz, 2020). The heat transfer between atmosphere and soil conforms to the energy conservation and can be expressed as (Chalhoub et al, 2017):…”

Section: Atmosphere-hghe-soil Interactionmentioning

confidence: 99%

“…(3) where H and R n represent respectively the sensible heat and the net radiation heat, W/m 2 ; L represents the latent heat vaporization, J/kg, and the L of water under the atmospheric pressure is 2.257 J/kg (Tang and Nowamooz, 2020); G denotes the heat flux through the top of the heat exchanger, W/m 2 .…”

Section: Atmosphere-hghe-soil Interactionmentioning

confidence: 99%

“…Pu et al (2018) compared the performances of HGHE under in-line and staggered arrangement, and indicated that the performance of staggered arrangement was better. Tang and Nowamooz (2020) established a numerical model to simulate the interaction between surface environment and soil, and found that this interaction had a great impact on the heat exchanger performance. Yang et al (2021) analyzed the effects of operation mode, groundwater seepage and longterm operation conditions on the HGHE.…”

Section: Introductionmentioning

confidence: 99%

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Comparative study on the thermal performance and economic efﬁciency of vertical and horizontal ground heat exchangers

Cui

Jiao

2022

Adv. Geo-Energy Res.

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The ground-coupled heat pump is a shallow geothermal exploitation method taking soil as the thermal energy source. The ground heat exchanger is an important component of this system, which includes vertical or horizontal configurations. However, to the best of our knowledge, few studies exist involving the comparison of thermal performances and installation costs of two heat exchanger types considering the influence of ground climate, which makes the selection of heat exchanger configuration challenging for a specific field application. Hence, a 3-dimensional numerical model considering the variations of atmospheric conditions and soil water content is constructed in this paper. Based on this model, the thermal performances and economical efficiencies of vertical and horizontal ground heat exchangers are compared. The results indicate that the thermal performance difference between the two heat exchangers is greater in winter than in summer. The thermal performance is hardly influenced by the injection mass flow rate, while it is considerably affected by the length of heat exchanger. The thermal power rises linearly with the increase in heat exchanger length, and the increment of the vertical ground heat exchanger is higher. In addition, when the heat exchanger length is shorter than 40 m, the installation cost and thereby the total cost of the horizontal ground heat exchanger is considerably higher. With regard to both the thermal performance and economic efficiency, a vertical ground heat exchanger is only recommended when installing a single shallow ground heat exchanger.

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Section: Atmosphere-hghe-soil Interactionmentioning

confidence: 99%

Section: Atmosphere-hghe-soil Interactionmentioning

confidence: 99%

Section: Atmosphere-hghe-soil Interactionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Comparative study on the thermal performance and economic efﬁciency of vertical and horizontal ground heat exchangers

Cui

Jiao

2022

Adv. Geo-Energy Res.

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“…The environmental factors range from measurement of air and ground temperatures, evaporation, humidity, soil moisture content, and wind velocity. These parameters directly contribute to convective heat transfer and moisture transfer coefficients controlling free surface heat and moisture losses [21]. Finally, the biological factor involves calculating evapotranspiration from different plants, and knowledge of the flora and fauna that grow and dwell in the vicinity of the UGPS is desirable [22].…”

Section: Introductionmentioning

confidence: 99%

Evolution of Temperature Field around Underground Power Cable for Static and Cyclic Heating

et al. 2021

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Power transmission covering long-distances has shifted from overhead high voltage cables to underground power cable systems due to numerous failures under severe weather conditions and electromagnetic pollution. The underground power cable systems are limited by the melting point of the insulator around the conductor, which depends on the surrounding soils’ heat transfer capacity or the thermal conductivity. In the past, numerical and theoretical studies have been conducted based on the mechanistic heat and mass transfer model. However, limited experimental evidence has been provided. Therefore, in this study, we performed a series of experiments for static and cyclic thermal loads with a cylindrical heater embedded in the sand. The results suggest thermal charging of the surrounding dry sand and natural convection within the wet sand. A comparison of heat transfer for dry, unsaturated and fully saturated sand is presented with graphs and colour maps which provide valuable information and insight of heat and mass transfer around an underground power cable. Furthermore, the measurements of thermal conductivity against density, moisture and temperature are presented showing positive nonlinear dependence.

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Progress and challenges of helical-shaped geothermal heat exchangers

Rashidi

Bakhshi

Rafee

2021

Environ Sci Pollut Res

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Outlet temperatures of a slinky-type Horizontal Ground Heat Exchanger with the atmosphere-soil interaction

Cited by 50 publications

References 45 publications

Comparative study on the thermal performance and economic efﬁciency of vertical and horizontal ground heat exchangers

Comparative study on the thermal performance and economic efﬁciency of vertical and horizontal ground heat exchangers

Evolution of Temperature Field around Underground Power Cable for Static and Cyclic Heating

Progress and challenges of helical-shaped geothermal heat exchangers

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