Now showing items 7-26 of 49

    • Design and simulation tool for ground source heat pump systems considering groundwater advection 

      Shoji, Yutaka; Katsura, Takao; Higashitani, Takashi; Nagano, Katsunori; Sakata, Yoshitaka (International Ground Source Heat Pump Association, 2018)
      Calculation of the underground temperature resulting from heat injection/extraction into/from ground heat exchangers (GHEXs) with hourly variation is one of the most noteworthy challenges to address when simulating and ...
    • Design of a laboratory borehole storage model 

      Mazzotti, Willem; Jiang, Yifeng; Monzo, Patricia; Lazzarotto, Alberto; Acuna, Jose; Palm, Bjorn (International Ground Source Heat Pump Association, 2018)
      This paper presents the design process of a 4x4 Laboratory Borehole Storage (LABS) model through analytical and numerical analyses. This LABS is intended to generate reference Thermal Response Functions (TRFs) as well as ...
    • Development and verification of control system for heat recovery ground source heat pump system 

      Katsura, Takao; Shoji, Yutaka; Miyashita, Yoshiki; Nagano, Katsunori; Nakamura, Yasushi (International Ground Source Heat Pump Association, 2018)
      An operation method and control system for heat recovery ground source heat pump (HR-GSHP) systems have been developed. By applying the operation method and control system, the heating and cooling output from the respective ...
    • Development of a thermal conductivity map of Stockholm 

      Malmberg, Malin; Raymond, Jasmin; Perozzi, Lorenzo; Gloaguen, Erwan; Mellqvist, Claes; Schwarz, Gerhard; Acuna, Jose (International Ground Source Heat Pump Association, 2018)
      New methods have been suggested to spatially extend in situ thermal response test (TRT) assessments based on geostatistical analysis. These methods can be used to determine a stochastic distribution of the subsurface thermal ...
    • Double source heat pump: A case study 

      Zarrella, Angelo; Zecchin, Roberto; Pasquier, Philippe; Guzzon, Diego; Ciantia, Michael; De Carli, Michele; Emmi, Giuseppe (International Ground Source Heat Pump Association, 2018)
      The design of a Ground Source Heat Pump (GSHP) system is critical because design choices affect the system's energy performance and operating conditions. If the thermal load profile on the ground side is unbalanced the ...
    • Dynamic modeling of flow boiling within plate heat exchangers for heat pump and refrigeration applications 

      Boese, Lennart; Opferkuch, Frank; Becker, Julian; Wensing, Michael (International Ground Source Heat Pump Association, 2018)
      Brazed Plate Heat Exchangers (BPHEs) are increasingly used as evaporators for refrigeration and heat pump applications. Detailed understanding of the underlying heat transfer phenomena is required for their effective design ...
    • Experimental setup to measure the heat-exchange processes by controlling thermal and hydraulic conditions 

      Scotton, Paolo; Teza, Giordano; Rossi, Daniele; Dalla Santa, Giorgia; Galgaro, Antonio (International Ground Source Heat Pump Association, 2018)
      The design of a Borehole Heat Exchanger (BHE) is based on the evaluation of the thermal exchange capacity of the whole system constituted by the probes and the surrounding ground. The energy performance of a BHE mainly ...
    • Extending the Ashrae Tp8 method for vertical borefield design to uniform BHE temperature boundary conditions 

      Rolando, Davide; Fossa, Marco; Priarone, Antonella (International Ground Source Heat Pump Association, 2018)
      The Ashrae method is a fast algorithm for calculating the overall length of closed-loop borehole heat exchangers, considering the ground thermal response and the building thermal load profile. The method includes a corrective ...
    • Field performance of a district central ground source heat pump system in the US 

      Im, Piljae; Liu, Xiaobing; Henderson, Hugh (International Ground Source Heat Pump Association, 2018)
      This case study discusses the field performance of a district central ground source heat pump (GSHP) system installed at Ball State University (BSU) in Muncie, IN., USA. This district GSHP system replaces the existing ...
    • Financial assessment of ground source heat pump systems against other selected heating and cooling systems for Australian conditions 

      Aditya, G. Riyan; Mikhaylova, Olga; Narsilio, Guillermo A.; Johnston, Ian W. (International Ground Source Heat Pump Association, 2018)
      Ground source heat pump (GSHP) systems can provide cost-effective space heating and cooling for buildings while using less fossil fuel compared to many conventional systems. Despite these benefits, they typically have ...
    • Foundation wall heat exchanger model and validation study 

      Shafagh, Ida; Rees, Simon J. (International Ground Source Heat Pump Association, 2018)
      Making use of foundation substructural elements as ground heat exchangers is an attractive option for larger non-residential buildings. An alternative to Energy Piles is to use wall substructures - so called diaphragm or ...
    • Full-scale model to predict borehole fluid temperature with groundwater advection 

      Cui, Tengfei; Cai, Shanshan; Guo, Haijin; Huang, Ting (International Ground Source Heat Pump Association, 2018)
      Ground source heat pump (GSHP) system is one of the major techniques that utilize shallow geothermal energy and borehole heat exchangers (BHEs) is the key component in GSHP system. Although most proposed analytical models ...
    • G-functions for bore fields with mixed parallel and series connections considering axial fluid temperature variations 

      Cimmino, Massimo (International Ground Source Heat Pump Association, 2018)
      A semi-analytical method based on the finite line source (FLS) solution is presented to evaluate thermal response factors for geothermal bore fields with mixed series and parallel connections between boreholes. Each borehole ...
    • Geothermal storage integration into supermarket's CO2 refrigeration system 

      Karampour, Mazyar; Sawalha, Samer; Mateu-Royo, Carlos; Rogstam, Jorgen (International Ground Source Heat Pump Association, 2018)
      This paper investigates the integration of geothermal storage into the state-of-the-art CO2 trans-critical booster systems. The objective is to evaluate the impact on energy efficiency of this integration. Three scenarios ...
    • High temperature borehole thermal energy storage - A case study 

      Malmberg, Malin; Mazzotti, Willem; Acuna, Jose; Lindstahl, Henrik; Lazzarotto, Alberto (International Ground Source Heat Pump Association, 2018)
      Combining High-Temperature Borehole Thermal Energy Storages (HT-BTES) with existing Combined Heat and Power (CHP) systems running on waste fuels seems to be a promising approach to increase the energy efficiency of district ...
    • Hybrid model for generating short-time g-functions 

      Brussieux, Yves; Bernier, Michel (International Ground Source Heat Pump Association, 2018)
      A hybrid numerical/analytical approach is proposed to predict short-time g-functions. Transient heat transfer in the borehole is solved numerically while ground heat transfer is evaluated analytically using the infinite ...
    • Hydrogeothermal characterization and modelling of a standing column well experimental installation 

      Beaudry, Gabrielle; Pasquier, Philippe; Marcotte, Denis (International Ground Source Heat Pump Association, 2018)
      Standing column wells (SCW) are efficient ground heat exchangers that offer promising potential for integration in dense urban areas. Recent years have witnessed a growing interest in SCWs, resulting in the development of ...
    • Impact of a demand-side management strategy in operating a hybrid geo-district energy system for a high-rise mixed-use residential building in Toronto, Canada 

      Alaica, Adam (International Ground Source Heat Pump Association, 2018)
      In Ontario, Canada, the building thermal energy market is largely driven by the low cost of natural gas as a heating fuel source, with natural gas rates being approximately five times less per unit energy than electricity. ...
    • Impacts of injection temperature on the relevant heat transport processes in groundwater heat pump (GWHP) systems 

      Park, Byeong-Hak; Lee, Kang-Kun (International Ground Source Heat Pump Association, 2018)
      In many hydrogeological applications, the influence of temperature on fluid density and viscosity have often been neglected. However, high contrasts in temperature which occurs in the field applications such as groundwater ...
    • Model predictive control applied to residential self-assisted ground source heat pumps 

      Laferriere, Alex; Cimmino, Massimo (International Ground Source Heat Pump Association, 2018)
      The seasonal performance and feasibility of a "self-assisted" ground source heat pump system are examined. The system uses an electric heating element to inject heat into the ground and reduce peak energy demand by eliminating ...