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Now showing items 21-30 of 35
Numerical simulation of pile geothermal heat exchanger with spiral tube considering its thermo-mechanical behavior
(International Ground Source Heat Pump Association, 2017)
Pile geothermal heat exchanger (PGHE), which utilizes the building foundation piles as part of the geothermal heat exchangers (GHEs) for a ground-coupled heat pump (GCHP) system, has been attracting the interests of ...
Influence of ground heat exchanger zoning operation on the GSHP system long-term operation performance
(International Ground Source Heat Pump Association, 2017)
To alleviate the ground heat accumulation after long term running of ground source heat pumps (GSHP), ground heat exchanger (GHE) zoning operation can be adopted. Two GHE operation modes - zoning operation and full running ...
Heat pump capacity effects on peak electricity consumption and total length of self- and solar-assisted shallow ground heat exchanger networks
(International Ground Source Heat Pump Association, 2017)
A new "self-assisted" Ground Source Heat Pump (GSHP) system configuration is proposed to address the relatively high peak electricity demand of undersized GSHP systems equipped with auxiliary electric heater. In this ...
Examination of ambient temperature variations effects on predicted fluid temperatures in vertical boreholes
(International Ground Source Heat Pump Association, 2017)
A fully-coupled model of geothermal bore fields is presented, taking into account the axial variations of borehole wall temperatures and heat extraction rates along the borehole lengths, fluid temperature variations inside ...
Model for ground temperature estimations and its impact on horizontal ground heat exchanger design
(International Ground Source Heat Pump Association, 2017)
The ground-source heat pump systems are highly efficient and energy saving. Its main disadvantage is a significantly higher installation cost compared to conventional systems. The length of the ground heat exchanger (GHX) ...
Comparison of the energy use for different heat transfer fluids in geothermal systems
(International Ground Source Heat Pump Association, 2017)
Geothermal systems that operate under 0°C must use antifreeze mixtures instead of water to avoid operational problems. This paper examines the energy consumption of the circulating pump and heat pump for various heat ...
Assessment of the gradient of an objective function by analytical derivation for optimization-based design of ground-coupled heat pump systems
(International Ground Source Heat Pump Association, 2017)
Optimization-based design of ground heat exchangers requires derivation of the objective function with respect to the design parameters, which is usually done through finite-differentiation of the cost or utility function. ...
Fractal approach to calculate the thermal conductivity of moist soil
(International Ground Source Heat Pump Association, 2017)
The ground heat exchanger (GHE) is a key component in the design of a GSHP system and the effective thermal conductivity is one of the most important parameters that determine the heat transfer underground. In this paper, ...
Measurement of internal and effective borehole resistances during thermal response tests
(International Ground Source Heat Pump Association, 2017)
In a conventional thermal response test (TRT), the main parameter evaluated is the bulk subsurface thermal conductivity surrounding the borehole. It is also possible to evaluate the borehole thermal resistance. Several ...
Updated assessment of the technical potential of geothermal heat pump applications in the United States
(International Ground Source Heat Pump Association, 2017)
This paper presents an updated assessment of the technical potential of applying geothermal heat pump (GHP) systems in businesses and homes of the United States. The assessed technical potential includes energy savings, ...