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G-Functions for multiple interacting pile heat exchangers

Loveridge, Fleur; Powrie, William - In: Energy 64 (2014) C, pp. 747-757

Pile heat exchangers – where heat transfer pipes are cast into the building piled foundations – offer an opportunity to … exchangers. However, analysis methods for pile heat exchangers are still under development. In particular there is an absence of … available methods and guidance for the amount of thermal interaction that may occur between adjacent pile heat exchangers and …

Persistent link: https://www.econbiz.de/10010810999

Analytical simulation of groundwater flow and land surface effects on thermal plumes of borehole heat exchangers

Rivera, Jaime A.; Blum, Philipp; Bayer, Peter - In: Applied Energy 146 (2015) C, pp. 421-433

Persistent link: https://www.econbiz.de/10011263247

Energy and exergy analysis of fossil plant and heat pump building heating system at two different dead-state temperatures

Lohani, S.P. - In: Energy 35 (2010) 8, pp. 3323-3331

In this paper, we deal with the energy and exergy analysis of a fossil plant and ground and air source heat pump building heating system at two different dead-state temperatures. A zone model of a building with natural ventilation is considered and heat is being supplied by condensing boiler....

Persistent link: https://www.econbiz.de/10010808887

Comparison of energy and exergy analysis of fossil plant, ground and air source heat pump building heating system

Lohani, S.P.; Schmidt, D. - In: Renewable Energy 35 (2010) 6, pp. 1275-1282

The energy and exergy flow for a space heating systems of a typical residential building of natural ventilation system with different heat generation plants have been modeled and compared. The aim of this comparison is to demonstrate which system leads to an efficient conversion and supply of...

Persistent link: https://www.econbiz.de/10010804704

Thermal Efficiency Comparison of Borehole Heat Exchangers with Different Drillhole Diameters

Luo, Jin; Rohn, Joachim; Bayer, Manfred; Priess, Anna - In: Energies 6 (2013) 8, pp. 4187-4206

Thermal efficiency of borehole heat exchangers (BHE) is of crucial importance for the design and optimization of ground source heat pump (GSHP) system. This paper investigates thermal efficiency of a BHE with three drillhole diameters: 121 mm, 165 mm and 180 mm. The BHE was installed in a GSHP...

Persistent link: https://www.econbiz.de/10010686236

Numerical simulation for the optimum design of ground source heat pump system using building foundation as horizontal heat exchanger

Nam, Yujin; Chae, Ho-Byung - In: Energy 73 (2014) C, pp. 933-942

Ground source heat pump system takes advantage of the stable ground temperature to achieve energy savings and to reduce CO2 emission. However, the system has several barriers for the wider application such as high installation costs, incompletion of design standard and lack of recognition as...

Persistent link: https://www.econbiz.de/10010906882

A new RC and g-function hybrid model to simulate vertical ground heat exchangers

Maestre, Ismael Rodríguez; Gallero, Francisco Javier … - In: Renewable Energy 78 (2015) C, pp. 631-642

This paper presents a new hybrid two-dimensional model to simulate single U-tube ground heat exchangers based on the use of the electrical analogy to model heat transfer within the borehole and thermal response factors (short and long time-step g-functions) to estimate heat flow to the...

Persistent link: https://www.econbiz.de/10011208712

Comparison on the transient cooling performances of hybrid ground-source heat pumps with various flow loop configurations

Lee, Joo Seong; Song, Kang Sub; Ahn, Jae Hwan; Kim, Yongchan - In: Energy 82 (2015) C, pp. 678-685

A HGSHP (hybrid ground-source heat pump) is proposed to solve the performance degradation of the GSHP (ground-source heat pump) under imbalanced load conditions. The HGSHP is composed of three flow loops: a refrigerant flow loop, a GFL (ground flow loop), and a SFL (supplemental flow loop). In...

Persistent link: https://www.econbiz.de/10011209564

Simple and accurate model for the ground heat exchanger of a passive house

Badescu, Viorel - In: Renewable Energy 32 (2007) 5, pp. 845-855

This paper develops previous research on passive house (PH) space heating. A simple and accurate ground heat exchanger model is developed. It is based on a numerical transient bi-dimensional approach that allows to computing the ground temperature at the surface and at various depths. The new...

Persistent link: https://www.econbiz.de/10010806356

Economic aspects of using ground thermal energy for passive house heating

Badescu, Viorel - In: Renewable Energy 32 (2007) 6, pp. 895-903

This paper develops previous research on space heating in passive houses (PH). The results reported are based on a complex theoretical model used to simulate the heating system operation in Pirmasens PH (Rhineland Palatinate, Germany). The economic feasibility of different active space heating...

Persistent link: https://www.econbiz.de/10010806387