Review of development from GSHP to UTES in China and other countries

Gao, Qing; Li, Ming; Yu, Miao; Spitler, Jeffrey D.; Yan, Yuying

doi:10.1016/j.rser.2008.09.012

Cited by 136 publications

(45 citation statements)

References 5 publications

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“…The GSHP systems use geothermal energy from shallow earth layers as a heat source or a heat sink, and absorb or emit heat to the underground through ground heat exchangers (GHE) to provide refrigeration or heat supply to buildings [1][2][3][4]. Their first application was in the USA in 1945.…”

Section: Introductionmentioning

confidence: 99%

Numerical Analysis of the Factors Influencing a Vertical U-Tube Ground Heat Exchanger

et al. 2016

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Abstract:The development of a three-dimensional, unsteady state model, which couples heat transfer with groundwater seepage for a vertical U-tube ground heat exchanger (GHE) is presented. The influence of underground soil thermal properties, grout materials, inlet water temperature and velocity, and groundwater seepage on heat transfer in the GHE is examined. The results indicate that before the heat in the borehole is saturated, the heat flux in the GHE is directly proportional to the thermal conductivity coefficient of the grout materials. The radius of the thermal effect of the GHE and the recovery rate of the temperature in the soil are also proportional to the thermal diffusion coefficient of the soil. In cooling mode, the increase of the inlet water temperature of the GHE results in enhanced heat transfer. However, this may cause issues with heat buildup. The increase of the inlet water velocity in the GHE enhances heat convection in the tube. The effect of thermal-seepage coupling in groundwater can reduce the accumulated heat, thus resulting in the effective enhancement of the heat transfer in the GHE.

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Section: Introductionmentioning

confidence: 99%

Numerical Analysis of the Factors Influencing a Vertical U-Tube Ground Heat Exchanger

et al. 2016

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“…Atmospheric concentration of greenhouse gases continues to increase, unless the global fossil fuel consumption greatly reduced (Gao Q, 2009).Global awareness of the serious environmental problems due to fossil fuel consumption increases every year (Sohn B H, 2005).The Heating ventilation and air conditioning (HVAC) systems in buildings account for 33% of global greenhouse gas emissions in 2010 (Ochsner K, 2008).About a third of the world energy consumption of building and operating according to a study in Griffith and others (Aikins K A, 2012) in atmospheric concentration of greenhouse gases (GHG) continues to increase, unless the global fossil fuel consumption greatly reduced. In China, as we all know, building energy consumption is also an important part of the country's total energy consumption.…”

Section: Introductionmentioning

confidence: 99%

The Renovation Methods Analysis for Current Buildings Air Conditioning Systems

Li¹

2016

Proceedings of the 2016 4th International Conference on Mechanical Materials and Manufacturing Engineering

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There are several problems in air current conditioning system, such as low energy efficiency, equipment aging, low operation efficiency, unnormal function, and poor thermal comfort. In order to better deal these issues, some renovation methods (including installation of ground source heat pump system, changing cold and heat source, reasonable using of displacement ventilation & natural ventilation, and strengthening the automatic control system) for current building air conditioning were suggested. The results show that the operating and energy efficiency characteristic current air conditioning system could be improved to a great extent through these methods employment.

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“…In particular, a ground source heat pump (GSHP) system is a highly efficient NRE system for heating and cooling the building [15][16][17][18]. This system relies on a relatively constant ground temperature and can transfer the earth's heat into a building during the winter, and transfer heat out of the building during the summer [19][20][21][22][23][24][25].…”

Section: Introductionmentioning

confidence: 99%

An Environmental and Economic Assessment for Selecting the Optimal Ground Heat Exchanger by Considering the Entering Water Temperature

et al. 2015

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Abstract:In order to solve environmental problems such as global warming and resource depletion in the construction industry, interest in new renewable energy (NRE) systems has increased. The ground source heat pump (GSHP) system is the most efficient system among NRE systems. However, since the initial investment cost of the GSHP is quite expensive, a feasibility study needs to be conducted from the life-cycle perspective. Meanwhile, the efficiency of GSHP depends most significantly on the entering water temperature (EWT) of the ground heat exchanger (GHE). Therefore, this study aims to assess the environmental and economic effects of the use of GHE for selecting the optimal GHE. This study was conducted in three steps: (i) establishing the basic information and selecting key factors affecting GHE performances; (ii) making possible alternatives of the GHE installation by considering EWT; and (iii) using life-cycle assessment and life-cycle cost, as well as comprehensive evaluation of the environmental and economic effects on the GHE. These techniques allow for easy and accurate determination of the optimal design of the GHE from the environmental and economic effects in the early design phase. In future research, a multi-objective decision support model for the GSHP will be developed. OPEN ACCESSEnergies 2015, 8 7753

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Review of development from GSHP to UTES in China and other countries

Cited by 136 publications

References 5 publications

Numerical Analysis of the Factors Influencing a Vertical U-Tube Ground Heat Exchanger

Numerical Analysis of the Factors Influencing a Vertical U-Tube Ground Heat Exchanger

The Renovation Methods Analysis for Current Buildings Air Conditioning Systems

An Environmental and Economic Assessment for Selecting the Optimal Ground Heat Exchanger by Considering the Entering Water Temperature

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