Browsing Proceedings of the IGSHPA Technical/Research Conference and Expo 2017 by Author "IGSHPA Technical/Research Conference and Expo (2017)"
Now showing items 1-20 of 44
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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
Chiasson, Andrew D.; Elhashmi, Rodwan (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 ... -
Analytical solution for optimal mass flow rate in primary circuit of ground-coupled heat pump systems
Picard, Damien; Jorissen, Filip; Helsen, Lieve (International Ground Source Heat Pump Association, 2017)Ground source heat pump (GSHP) systems extract heat or cold from the ground by circulating a heat carrier uid (HCF) in a ground heat exchanger and inject this energy in buildings. This paper shows that there exists an ... -
Assessment of effective borehole thermal resistance from operational data
Mikhaylova, Olga; Johnston, Ian W.; Narsilio, Guillermo A. (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 ... -
Assessment of the gradient of an objective function by analytical derivation for optimization-based design of ground-coupled heat pump systems
Dusseault, Bernard; Pasquier, Philippe; Marcotte, Denis (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. ... -
Can ground source heat pumps perform well in Alaska?
Garber-Slaght, Robbin; Peterson, Rorik (International Ground Source Heat Pump Association, 2017)The long heating season and cold soils of Alaska provide a harsh testing ground for ground source heat pumps (GSHPs), even those designed and marketed for colder climates. Fairbanks, Alaska has 7,509°C heating degree-days18 ... -
Comparison of the energy use for different heat transfer fluids in geothermal systems
Gagné-Boisvert, Laurent; Bernier, Michel (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 ... -
Coupled heating optimization of hybrid GCHP system with heat compensation unit
You, Tian; Li, Xianting; Wu, Wei; Shi, Wenxing; Wang, Baolong (International Ground Source Heat Pump Association, 2017)The coupled HCUT-GCHP system (integrating the GCHP with the efficient heat compensation unit (HCUT)) can operate in heat compensation mode and coupled heating mode to effectively eliminate the soil thermal imbalance and ... -
Design and analytical analysis of foundation pile ground heat exchanger with spiral coils
Man, Yi; Qu, Yunxia; Wang, Zejiang; Fang, Zhaohong (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
Kalantar Mehrjerdi, Adib; Naudin, Sebastien; Skrifvars, Mikael (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
Choi, Wonjun; Ooka, Ryozo (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 ... -
Direct expansion ground source heat pump using carbon dioxide as refrigerant: Test facility and theoretical model presentation
Eslami Nejad, Parham; Badache, Messaoud; Ouzzane, Mohamed; Aidoun, Zine (International Ground Source Heat Pump Association, 2017)In an attempt to address recent challenges on using natural refrigerants and to develop further knowledge and expertise in the field of direct expansion ground source heat pump (DX-GSHP), an experimental transcritical ... -
Effect of an off-peak ground pre-cool control strategy on hybrid ground-source heat pump systems
Alaica, Adam A.; Dworkin, Seth B. (International Ground Source Heat Pump Association, 2017)Hybrid Ground-Source Heat Pump (HGSHP) systems have been introduced as an alternate system configuration to remedy the current financial hurdles associated to the installation of geo-exchange technology. However, there ... -
Energy performance evaluation of a recycled water heat pump system in cool and dry climate zone
Im, Piljae; Liu, Xiaobing (International Ground Source Heat Pump Association, 2017)This paper presents performance evaluation results for a recycled water heat pump (RWHP) system, which uses the recycled water from a municipal water system as a heat sink and heat source for heat pumps. The temperature ... -
Examination of ambient temperature variations effects on predicted fluid temperatures in vertical boreholes
Cimmino, Massimo (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 ... -
Fast and accurate calculation of the soil temperature distribution around ground heat exchanger based on a response factor model
You, Tian; Li, Xianting; Shi, Wenxing; Wang, Baolong (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 ... -
First measurements of a monitoring project on a BTES system
Monzo, Patricia; Lazzarotto, Alberto; Acuna, Jose (International Ground Source Heat Pump Association, 2017)Performance of Borehole Thermal Energy Storage (BTES) systems depends on the temperature of the secondary fluid, circulating through the ground-loop heat exchangers. Borehole systems are therefore designed in order to ... -
Fractal approach to calculate the thermal conductivity of moist soil
Cai, Shanshan; Cui, Tengfei; Zheng, Boren; Hu, Pingfang (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, ... -
Heat extraction distributed thermal response test: A methodological approach and in-situ experiment
Rolando, Davide; Acuna, Jose; Fossa, Marco (International Ground Source Heat Pump Association, 2017)The Thermal Response Test (TRT) is a worldwide adopted in-situ methodology able to estimate the ground thermal conductivity and borehole thermal resistance. During the test the carrier-fluid exchanges a constant heat flux ... -
Heat pump capacity effects on peak electricity consumption and total length of self- and solar-assisted shallow ground heat exchanger networks
Eslami Nejad, Parham; Cimmino, Massimo; Hosatte-Ducassy, Sophie (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
Li, Min; Sun, TieMeng; Zhuo, XueCheng (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 ...