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The feasibility of renewable energy sources for pumping clean water in sub-Saharan Africa: A case study for Central Nigeria

Cloutier, Michael; Rowley, Paul - In: Renewable Energy 36 (2011) 8, pp. 2220-2226

of safe and consistent water supplies for drinking and other domestic or agricultural uses. Borehole supplies are capable …

Persistent link: https://www.econbiz.de/10011044908

Influence on thermal response test by groundwater flow in vertical fractures in hard rock

Gehlin, S.E.A.; Hellström, G. - In: Renewable Energy 28 (2003) 14, pp. 2221-2238

In this paper different approaches to groundwater flow and its effect in the vicinity of a borehole ground heat …

Persistent link: https://www.econbiz.de/10011045725

An average fluid temperature to estimate borehole thermal resistance of ground heat exchanger

Du, Ciyuan; Chen, Youming - In: Renewable Energy 36 (2011) 6, pp. 1880-1885

Analysis of borehole thermal resistance is important for the standard sizing of ground heat exchanger (GHE). In this … paper, a p-linear dimensionless average fluid temperature is proposed to estimate borehole thermal resistance. A p …

Persistent link: https://www.econbiz.de/10011045805

Heat transfer analysis of short helical borehole heat exchangers

Zarrella, Angelo; De Carli, Michele - In: Applied Energy 102 (2013) C, pp. 1477-1491

In this paper a numerical model to analyze the thermal behaviour of vertical ground heat exchangers with a helical shaped pipe is presented. This type of configuration can be a suitable alternative to conventional ground heat exchangers, especially when the heating and cooling loads of the...

Persistent link: https://www.econbiz.de/10010603035

Freezing of geothermal borehole surroundings: A numerical and experimental assessment with applications

Eslami-nejad, Parham; Bernier, Michel - In: Applied Energy 98 (2012) C, pp. 333-345

. First, a one-dimensional radial numerical heat transfer model is developed to evaluate heat transfer from the borehole wall … using temperature measurements. The apparatus mimics the behavior of a geothermal borehole and uses a homogeneous saturated …

Persistent link: https://www.econbiz.de/10010702560

Modeling of a two-phase CO2-filled vertical borehole for geothermal heat pump applications

Eslami-Nejad, Parham; Ouzzane, Mohamed; Aidoun, Zine - In: Applied Energy 114 (2014) C, pp. 611-620

A numerical model has been developed to study the complex thermal behavior of a CO2-filled vertical geothermal borehole …-state conservation equations of mass, momentum and energy is applied. The borehole is divided into small volume elements due to … relatively significant changes in the thermophysical properties of the fluid. Borehole wall temperature variations as well as …

Persistent link: https://www.econbiz.de/10010729381

Computer simulation of borehole ground heat exchangers for geothermal heat pump systems

Lee, C.K.; Lam, H.N. - In: Renewable Energy 33 (2008) 6, pp. 1286-1296

Computer simulation of borehole ground heat exchangers used in geothermal heat pump systems was conducted using three …-dimensional implicit finite difference method with rectangular coordinate system. Each borehole was approximated by a square column … circumscribed by the borehole radius. Borehole loading profile calculated numerically based on the prescribed borehole temperature …

Persistent link: https://www.econbiz.de/10010803683

Wind power for pumping: The development of the ITP windpump

Fraenkel, P.L.; Crick, F.J.; Cowley, P.D. - In: Renewable Energy 16 (1999) 1, pp. 916-921

Water pumping has been one of the main applications for wind power in the past and despite the spread of mains-electric pumps, more than a million windpumps remain in regular use. This paper reviews the general technical and economic requirements for pumping water using wind energy and by way of...

Persistent link: https://www.econbiz.de/10010803875

Short time step analysis of vertical ground-coupled heat exchangers: The approach of CaRM

Zarrella, Angelo; Scarpa, Massimiliano; De Carli, Michele - In: Renewable Energy 36 (2011) 9, pp. 2357-2367

In this paper an improvement of the model CaRM (CApacity Resistance Model) is presented to consider the borehole … thermal capacitance, both of the filling material of the borehole and of the heat carrier fluid inside the ground heat …-coupled heat pump systems. According to the modelling for the surrounding ground, the new approach for the inside of the borehole …

Persistent link: https://www.econbiz.de/10010805736

A computational capacity resistance model (CaRM) for vertical ground-coupled heat exchangers

De Carli, Michele; Tonon, Massimo; Zarrella, Angelo; … - In: Renewable Energy 35 (2010) 7, pp. 1537-1550

needed during design: both the borehole and the surrounding ground are affected by thermal exchange. The model here presented …-tube or coaxial pipes. Besides, ground temperature at different distances from borehole are calculated, taking into account …

Persistent link: https://www.econbiz.de/10010806238