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Heating performance verification of a ground source heat pump system with U-tube and double tube type GLHEs
Choi, Jong Min; Park, Yongjung; Kang, Shin-Hyung - In: Renewable Energy 54 (2013) C, pp. 32-39
This study is to evaluate the heating performance verification of ground source heat pump systems with U-tube and double tube type ground loop heat exchangers. Both the GLHEs were designed by using the GLHEPRO being a very popular commercial program to design various GLHEs. The U-tube and double...
Persistent link: https://www.econbiz.de/10010803955
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Single and double U-tube ground heat exchangers in multiple-layer substrates
Florides, Georgios A.; Christodoulides, Paul; … - In: Applied Energy 102 (2013) C, pp. 364-373
). Multiple ground layers with regard to GHE and the presence of more than one loops in each borehole (multiple U-tubes) are … study of a double U-tube GHE in a single borehole and the assessment of its efficiency with regard to its building cost … developed for energy flows and temperature changes in and around a borehole, when a fluid circulates through single and double U …
Persistent link: https://www.econbiz.de/10010603051
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Safe drinking water and satisfaction with environmental quality of life in some oil and gas industry impacted cities of Nigeria
Ejechi, E.; Ejechi, B. - In: Social Indicators Research 85 (2008) 2, pp. 211-222
Persistent link: https://www.econbiz.de/10009404002
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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
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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
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A modified multi-ground-layer model for borehole ground heat exchangers with an inhomogeneous groundwater flow
Lee, C.K.; Lam, H.N. - In: Energy 47 (2012) 1, pp. 378-387
A modified model for a borehole ground heat exchanger borefield (BHE) of a ground-source heat pump (GSHP) system was … inhomogeneous groundwater flow in the soil. The model was validated using FLUENT for a single borehole based on a constant load … along the effective length of the borehole with good agreement. The present model was then used to investigate the effect of …
Persistent link: https://www.econbiz.de/10010811677
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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
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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
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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
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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