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Akademiska Hus Carrier CTC / Enertech Donghua University Fastighetsägarna Geotec Grundfos IVT LTH NCC Nibe SWECO TAC Thermia Värme Wilo ÅF- Infrastruktur. OPTIMIZATION OF GROUND COUPLED HEAT PUMP SYSTEMS. Saqib Javed (PhD Researcher) Per F ahlén (Research Leader)

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Akademiska Hus

Carrier

CTC / Enertech

Donghua University

Fastighetsägarna

Geotec

Grundfos

IVT

LTH

NCC

Nibe

SWECO

TAC

ThermiaVärme

Wilo

ÅF-Infrastruktur

OPTIMIZATION OF

GROUND COUPLED HEAT PUMP SYSTEMS

Saqib Javed (PhD Researcher)

Per Fahlén (Research Leader)

Johan Claesson (Supervisor)

EFFSYS 2 meeting 2009-12-14


objective

  • Identifying key optimization factors for Ground Coupled Heat Pump (GCHP) systems using modelling, simulations field studies and experiments.

  • Developing simple and user-friendly models and calculation tools to facilitate designers and researchers interested in the complete system optimization.

EFFSYS 2 meeting 2009-12-14


Literature review
Literature review

  • Single boreholes: Long term response can be modelled using simple existing analytical models with reasonable accuracy.

  • Multiple boreholes: Shortage of analytical models for both long and short term response.

  • Need of an analytical model which:

    • is capable of simulating both short-term and long-term response of GHE.

    • considers all significant heat transfer processes in GHE.

    • retains the actual geometry of the borehole.

EFFSYS 2 meeting 2009-12-14


Case study
Case study

  • Astronomy-House, Lund University

    • Floor area: 5300 m2

    • Heating demand: 475 MWh

    • Cooling demand: 155 MWh

  • Ground system

    • 20 boreholes

    • Rectangular configuration

    • Each 200 m deep

  • EFFSYS 2 meeting 2009-12-14


    Simulating multiple boreholes
    Simulating MULTIPLE BOREHOLES

    Tb = brine temperature

    Tw = borehole wall temperature

    Tp = temperature penalty from neighbouring boreholes

    EFFSYS 2 meeting 2009-12-14


    Mean brine temperatures
    MEAN BRINE TEMPERATURES

    EFFSYS 2 meeting 2009-12-14


    Publications
    publications

    • Javed, S., Fahlén, P. and Holmberg, H., 2009. Modelling for optimization of brine temperature in ground source heat pump systems. Proceedings of 8th international conference on sustainable energy technologies; SET2009, Aachen, Germany. August 31- September 3.

    • Javed, S., Fahlén, P. and Claesson, J., 2009. Vertical ground heat exchangers: A review of heat flow models. Proceedings of 11th international conference on thermal energy storage; Effstock 2009, Stockholm, Sweden. June 14-17.

    • Fahlén, P, 2008. Efficiency aspects of heat pump systems - Load matching and parasitic losses. IEA Heat pump centre Newsletter, vol. 26, nr. 3, 2008-08, (IEA.).

    EFFSYS 2 meeting 2009-12-14


    Literature review1
    Literature review

    • Single boreholes: Long term response can be modelled using simple existing analytical models with reasonable accuracy.

    • Multiple boreholes: Shortage of analytical models for both long and short term response.

    • Need of an analytical model which:

      • is capable of simulating both short-term and long-term response of GHE.

      • considers all significant heat transfer processes in GHE.

      • retains the actual geometry of the borehole.

    EFFSYS 2 meeting 2009-12-14


    Modelling
    modelling

    • Existing Analytical models:

      • Equivalent pipe / cylinder instead of a U-tube.

      • Thermal capacities of the water and the pipe are often ignored.

      • Response is a function only of the distance (r) from the centre of the equivalent pipe.

    EFFSYS 2 meeting 2009-12-14


    Modelling1
    modelling

    • New Analytical models:

      • Two pipes in the ground.

      • Accounts for the thermal short circuiting between the two legs of the U-tube.

      • Response is a function of both x and y.

      • Can predict the short time response accurately.

    EFFSYS 2 meeting 2009-12-14


    Modelling2
    modelling

    • New Analytical models:

      • Two pipes in the grout surrounded by the ground.

      • Accounts for the thermal properties of both the grout and the ground.

    EFFSYS 2 meeting 2009-12-14


    Modelling3
    modelling

    • New Numerical model:

      • Solved the heat transfer problem in 2D using conformal coordinate system.

      • Used for the validation of the analytical model.

    EFFSYS 2 meeting 2009-12-14


    Literature review2
    Literature review

    • Single boreholes: Long term response can be modelled using simple existing analytical models with reasonable accuracy.

    • Multiple boreholes: Shortage of analytical models for both long and short term response.

    • Need of an analytical model which:

      • is capable of simulating both short-term and long-term response of GHE.

      • considers all significant heat transfer processes in GHE.

      • retains the actual geometry of the borehole.

    EFFSYS 2 meeting 2009-12-14


    Experiments
    experiments

    • Development of a test facility.

    • Experiments to determine:

      • Thermal response for heat extraction and injection conditions.

      • Flow effects.

      • System effects.

    • Validation of the developed models.

    EFFSYS 2 meeting 2009-12-14


    Laboratory development
    Laboratory development

    EFFSYS 2 meeting 2009-12-14


    Laboratory development1
    Laboratory development

    EFFSYS 2 meeting 2009-12-14


    Brine chilled water system
    Brine & chilled water system

    EFFSYS 2 meeting 2009-12-14


    Hot water system
    Hot water system

    EFFSYS 2 meeting 2009-12-14


    Ground heat exchanger system
    Ground heat exchanger system

    EFFSYS 2 meeting 2009-12-14


    Thermal response testing
    Thermal response testing

    EFFSYS 2 meeting 2009-12-14


    Initial results
    Initial results

    • Ground thermal conductivity: 3 W/m-K

    • Undisturbed ground temperature: 9 °C

    EFFSYS 2 meeting 2009-12-14


    Conclusions
    conclusions

    • Conducted a state-of-the-art literature review.

    • Presented different approaches to model multiple borehole systems.

    • Developing new analytical and numerical methods.

    • Carrying out experiments.

    EFFSYS 2 meeting 2009-12-14


    Questions comments thank you
    Questions / commentsThank you!

    EFFSYS 2 meeting 2009-12-14


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