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The influence of the thermosiphon effect on the thermal response test

Gehlin, S.E.A.; Hellström, G.; Nordell, B. - In: Renewable Energy 28 (2003) 14, pp. 2239-2254

of great importance for the design and sizing of borehole thermal energy systems (BTESs). In Scandinavia groundwater … groundwater flow between the borehole and the surrounding rock. An enhanced heat transport then occurs due to the induced … part of the borehole while groundwater of ambient temperature enters the borehole through fractures at larger depths. This …

Persistent link: https://www.econbiz.de/10011044580

Numerical analysis of thermal response tests with a groundwater flow and heat transfer model

Raymond, J.; Therrien, R.; Gosselin, L.; Lefebvre, R. - In: Renewable Energy 36 (2011) 1, pp. 315-324

most ground-coupled heat pump environments with the exception of geological settings where there is significant groundwater … numerical groundwater flow and heat transfer model. The input temperature signal is specified at the entrance of the ground heat …

Persistent link: https://www.econbiz.de/10010804601

Field demonstration of a first thermal response test with a low power source

Raymond, Jasmin; Lamarche, Louis; Malo, Michel - In: Applied Energy 147 (2015) C, pp. 30-39

Thermal response tests conducted to assess the subsurface thermal conductivity for the design of ground-coupled heat pump systems require a power source of about 7–12kW to heat water circulating in a ground heat exchanger. This high power is commonly supplied with a fuel-fired generator, which...

Persistent link: https://www.econbiz.de/10011263240

Numerical sensitivity study of thermal response tests

Wagner, Valentin; Bayer, Peter; Kübert, Markus; Blum, … - In: Renewable Energy 41 (2012) C, pp. 245-253

groundwater velocity with varying thermal dispersivity values, however, has a significant influence on the thermal borehole …Thermal conductivity and thermal borehole resistance are basic parameters for the technical and sustainable design of … the borehole heat exchanger (BHE) and all transport effects are combined in the parameters of effective thermal …

Persistent link: https://www.econbiz.de/10011045248

Performance evaluation of closed-loop vertical ground heat exchangers by conducting in-situ thermal response tests

Lee, Chulho; Park, Moonseo; Nguyen, The-Bao; Sohn, Byonghu - In: Renewable Energy 42 (2012) C, pp. 77-83

The effective thermal conductivity of six vertical closed-loop ground heat exchangers (GHEXs), which were installed in a test bed located in Wonju, South Korea, has been experimentally evaluated by performing in-situ thermal response tests (TRTs). To compare the thermal efficiency of the GHEXs...

Persistent link: https://www.econbiz.de/10010804271

Performance evaluation of latent heat TES system-case study: Dimensions improvements of annular fins exchanger

El Maazouzi, Zakaria; El Alami, M.; Agalit, H.; … - In: Energy Reports 6 (2020) 1, pp. 294-301

Thermal Energy Storage (TES) is an important challenge for the development and implementation of Concentrated Solar Power (CSP) plants. The heat can be stored in a sensible, thermochemical or latent form. Recently, the latent heat thermal energy storage (LHTES) kind has gained the most of...

Persistent link: https://www.econbiz.de/10012652109

Increasing the efficiency of a drone motor by arranging magnetic sheets to windings

Sato, Mitsuhide; Nirei, Masami; Yamanaka, Yuichiro; … - In: Energy Reports 6 (2020) 2, pp. 439-446

In recent years, there has been an increase in motorization; therefore, the demand for high-efficiency motors in automobiles and aircrafts will further increase. A drone is an aircraft that flies without a human pilot onboard; it has a short flight time because the size of the mounted battery is...

Persistent link: https://www.econbiz.de/10012652276

Polymeric foam properties derived from 3D images

Saadatfar, M.; Knackstedt, M.A.; Arns, C.H.; Sakellariou, A. - In: Physica A: Statistical Mechanics and its Applications 339 (2004) 1, pp. 131-136

We demonstrate the ability to calculate thermal conductance and elastic properties on three-dimensional images of industrial polymer foamed materials. Results for thermal conductivity and elasticity show little scatter and provide the basis for accurate empirical correlations between phase...

Persistent link: https://www.econbiz.de/10010874369

Effect of thermal conductivities of shape stabilized PCM on under-floor heating system

Cheng, Wenlong; Xie, Biao; Zhang, Rongming; Xu, Zhiming; … - In: Applied Energy 144 (2015) C, pp. 10-18

A kind of heat conduction-enhanced shape-stabilized PCM (HCE-SSPCM) was utilized in the under-floor heating system for house heating in winter. This system charges heat by using cheap nighttime electricity and provides heating needs throughout all day. The effect of thermal conductivity of the...

Persistent link: https://www.econbiz.de/10011263266

Physical properties of G-class cement for geothermal well cementing in South Korea

Won, Jongmuk; Lee, Dongseop; Na, Kyunguk; Lee, In-Mo; … - In: Renewable Energy 80 (2015) C, pp. 123-131

The cement material adopted for a new geothermal well project in South Korea is specialized as the G-class cement, which is commonly used in the oil-well industry, and regulated by the API (American Petroleum Institute). In order to maintain the optimal generating performance of geothermal...

Persistent link: https://www.econbiz.de/10011263737