Browsing OSU - IGSHPA Papers by Subject "heat exchangers"
Now showing items 1-20 of 21
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Alternate approach to the calculation of thermal response factors for vertical borehole ground heat exchanger arrays using an incomplete bessel function
(International Ground Source Heat Pump Association, 2017)This article presents yet another methodology for the calculation of dimensionless thermal response factors for vertical borehole ground heat exchanger (GHX) arrays, which is a concept introduced by Eskilson (1987). The ... -
Assessment of effective borehole thermal resistance from operational data
(International Ground Source Heat Pump Association, 2017)Ground source heat pump (GSHP) systems use the ground as a source of sustainable thermal energy for heating and cooling of buildings. Efficient design of the ground heat exchangers (GHEs) for these systems is important so ... -
Design and analytical analysis of foundation pile ground heat exchanger with spiral coils
(International Ground Source Heat Pump Association, 2017)Recently, utilization of building foundation piles as the ground heat exchanger (GHE) received more and more attention since it can reduce the initial cost and land area requirement compared with the borehole GHE. This ... -
Development of polyolefin compound and post-polymerization treatments for ground heat exchangers
(International Ground Source Heat Pump Association, 2017)A ground source heat pump (GSHP) system can be used for both cooling and heating modes simultaneously for commercial, industrial and residential buildings virtually at any location with great flexibility to cover a wide ... -
Development of TPRT (Thermal Performance-Response Test) for borehole heat exchanger design
(International Ground Source Heat Pump Association, 2017)To obtain the effective thermal conductivity and borehole thermal resistance required to design borehole heat exchangers (BHEs), thermal response tests (TRTs) are usually conducted. Although many advanced TRT methods have ... -
Fast and accurate calculation of the soil temperature distribution around ground heat exchanger based on a response factor model
(International Ground Source Heat Pump Association, 2017)Ground heat exchanger (GHE) is an important component of ground coupled heat pump system (GCHP). To calculate the soil temperature around GHE accurately and fast, a refined response factor model (RF model) is proposed. It ... -
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 ... -
High time-resolution analytical models for heat transfer through U-shaped ground heat exchangers
(International Ground Source Heat Pump Association, 2017)This paper reports a set of high time-resolution analytical models for heat transfer of GHEs, including a full scale line-source model for heat transfer outside U-shaped pipes and a quasi-3D heat transfer model for the ... -
Influence of different ground thermal properties in a borehole heat exchanger's performance using the B2G dynamic model
(International Ground Source Heat Pump Association, 2017)Ground source heat pump (GSHP) systems for heating and cooling represent an efficient alternative to conventional air source heat pump systems, always provided that they present an efficient design and operation. In this ... -
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 ... -
Investigation on the effects of different time resolutions in the design and simulation of BHE fields
(International Ground Source Heat Pump Association, 2017)The correct design of a field of Borehole Heat Exch angers (BHE) requires the knowledge of ground thermal properties, heat pump performance and building heating and cooling demand. The sequence o f heat pulses from (to) ... -
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) ... -
Modelling and experimental validation of a novel co-axial spiral borehole heat exchanger
(International Ground Source Heat Pump Association, 2017)In order to optimize the operation of a ground source heat pump (GSHP) system, the development of dynamic models that integrate all the system components is a key factor. Particularly, the modelling of the ground source ... -
Nanocomposite materials used for ground heat exchanger pipes
(International Ground Source Heat Pump Association, 2017)This study compares the performance of single U-pipe, double U-pipe, and coaxial ground heat exchangers (GHE) equipped with standard HDPE and thermally enhanced (TE) pipes. Sizing calculations and 10-year hourly simulations ... -
Numerical investigation on the thermo-mechanical behavior of a quadratic cross section pile heat exchanger
(International Ground Source Heat Pump Association, 2017)Pile heat exchangers are traditional foundation piles with built in heat exchangers. As such, the footing of the building both serves as a structural component and a heating/cooling supply element. The existing geotechnical ... -
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 ... -
Providing low carbon cooling through pile foundations; the effect of thermal cycling on clay strength
(International Ground Source Heat Pump Association, 2017)Pile foundations provide a low-intrusive mechanism for installing heat exchangers into the ground, especially if the piles are being installed to support the building. The ground temperature is relatively constant at depths ... -
Second-order multipole formulas for thermal resistance of single U-tube borehole heat exchangers
(International Ground Source Heat Pump Association, 2017)The borehole thermal resistance is both an important design parameter and a key performance characteristic of a borehole heat exchanger. Another quantity that is particularly important for deep borehole heat exchangers is ... -
Thermal response of helix ground heat exchangers
(International Ground Source Heat Pump Association, 2017)This paper is devoted to the thermal analysis of shallow ground heat exchangers with pipes arranged in a helix configuration. The pipes where the carrier fluid is circulated typically embrace a cylindrical volume that is ... -
Three dimensional numerical simulation of double-U pile heat exchangers
(International Ground Source Heat Pump Association, 2017)The Ground Source Heat Pump system with pile heat exchangers has been used in engineering in recent years. In this paper, a three-dimensional numerical model of double-U pile heat exchangers is established which was verified ...