OPTIMIZATION OF Donghua University Fastighetsgarna GROUND SOURCE - - PowerPoint PPT Presentation

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OPTIMIZATION OF Donghua University Fastighetsgarna GROUND SOURCE - - PowerPoint PPT Presentation

Jun 04, 2023 442 likes •712 views

Building Services Engineering CHALMERS Akademiska Hus Carrier CTC / Enertech OPTIMIZATION OF Donghua University Fastighetsgarna GROUND SOURCE HEAT PUMP Geotec Grundfos SYSTEMS IVT LTH Saqib Javed (PhD Researcher) NCC Nibe Per

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SLIDE 1

Building Services Engineering CHALMERS

OPTIMIZATION OF GROUND SOURCE HEAT PUMP SYSTEMS

Saqib Javed (PhD Researcher) Per Fahlén (Research Leader) Johan Claesson (Supervisor)

Akademiska Hus Carrier CTC / Enertech Donghua University Fastighetsägarna Geotec Grundfos IVT LTH NCC Nibe SWECO TAC Thermia Värme Wilo ÅF-Infrastruktur

EFFSYS 2 meeting 2010-06-10

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SLIDE 2

Building Services Engineering CHALMERS

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

  • Developing

simple and user-friendly models and calculation tools to facilitate the work of designers and researchers interested in the complete system

  • ptimization.

OBJECTIVE

EFFSYS 2 meeting 2010-06-10

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SLIDE 3

Building Services Engineering CHALMERS Long-Term Response Short-Term Response Borehole Resistance

  • Classical line source

solution (LS)

  • Classical cylindrical

source solution (CS)

  • Superposition borehole

model (SBM)

  • Finite-length line

source solutions

  • Numerical solution of

Yavuzturk

  • Buried electric cable

analogy

  • Lamarche and

Beauchamp’s solution

  • Virtual solid solution
  • Drake and Eckert’s

method

  • Gu and O’Neal’s method
  • Paul’s empirical method
  • Hellström’s approach
  • Multipole method
  • Quassi 3D methods

LITERATURE REVIEW

EFFSYS 2 meeting 2010-06-10

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SLIDE 4

Building Services Engineering CHALMERS

  • Long-term response:
  • Existing solutions to model single borehole systems
  • Shortage of solutions to model multiple borehole systems
  • Short-term response solutions:

Use simplifying assumptions. Check for consistency and accuracy.

LITERATURE REVIEW

EFFSYS 2 meeting 2010-06-10

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SLIDE 5

Building Services Engineering CHALMERS

ANALYTICAL SOLUTIONS: LONG-TERM RESPONSE OF MULTIPLE BOREHOLES

8 9 10 11 12 13 14 15 16 ‐3 ‐1 1 3 5 7 9 5 10 15 Maximum mean fluid temperature [deg C] Minimum mean fluid temperature [deg C] Year

CS (borehole interaction with infinite LS) CS (borehole interaction with finite LS) Infinite LS (borehole interaction with infinite LS) Finite LS (borehole interaction with finite LS) SBM Maximum mean fluid temperature → ← Minimum mean fluid temperature

EFFSYS 2 meeting 2010-06-10

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SLIDE 6

Building Services Engineering CHALMERS

ANALYTICAL SOLUTIONS: SHORT-TERM BOREHOLE RESPONSE

0.00 0.10 0.20 0.30 0.40 5 10 15 20 Temperature Increase (K) Time (hours) BFTM solution L & B solution VS solution New Analytical solution

EFFSYS 2 meeting 2010-06-10

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SLIDE 7

Building Services Engineering CHALMERS

  • Laplace transformation based approach.
  • Considers capacities, resistances and properties of all

borehole elements.

  • Use of thermal network

to model any physical or thermal setting

  • f

the borehole.

  • Very concise formulas to
  • btain

time dependent solutions.

NEW ANALYTICAL SOLUTION

EFFSYS 2 meeting 2010-06-10

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SLIDE 8

Building Services Engineering CHALMERS

  • Studies one dimensional heat conduction problem.
  • Transforms

the radial coordinate to a conformal coordinate.

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NEW NUMERICAL SOLUTION

EFFSYS 2 meeting 2010-06-10

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SLIDE 9

Building Services Engineering CHALMERS

VALIDATION: INTER-MODEL COMPARISON

0.001 0.002 0.003 0.004 25 50 75 100 Temperature Difference (K) Time (hours)

EFFSYS 2 meeting 2010-06-10

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SLIDE 10

Building Services Engineering CHALMERS

VALIDATION: EXPERIMENTAL DATA

0.00 0.05 0.10 0.15 0.20 0.25 10 20 30 40 50 Temperature Difference (K) Time (hours)

EFFSYS 2 meeting 2010-06-10

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SLIDE 11

Building Services Engineering CHALMERS

LABORATORY DEVELOPMENT

EFFSYS 2 meeting 2010-06-10

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SLIDE 12

Building Services Engineering CHALMERS

LABORATORY DEVELOPMENT

EFFSYS 2 meeting 2010-06-10

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SLIDE 13

Building Services Engineering CHALMERS

NEW GSHP TEST FACILITY

EFFSYS 2 meeting 2010-06-10

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SLIDE 14

Building Services Engineering CHALMERS

NEW GSHP TEST FACILITY

AT2

+5--+15

Process cooling water HX1 AT1

  • 10--+10

HP1 From HP2 Borehole system Process cooling agent (Brine) To HP2

+

EH1 To DC1 From DC1

EFFSYS 2 meeting 2010-06-10

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SLIDE 15

Building Services Engineering CHALMERS

NEW GSHP TEST FACILITY

HW1 process heating water HP2 HP3 To AT2 From AT2 AT3

+20--+55

AT4

+20--+55

HW1 heating system HX2 To DC2 Return HW1 From DC2

EFFSYS 2 meeting 2010-06-10

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SLIDE 16

Building Services Engineering CHALMERS

HW1 process heating water AT3

+20--+55

AT4

+20--+55

HW1 heating system HX2 AT5

+20--+80

EP1

+20--+80

HW2 process heating water

RC

NEW GSHP TEST FACILITY

EFFSYS 2 meeting 2010-06-10

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SLIDE 17

Building Services Engineering CHALMERS

  • New GSHP test facility consisting of:

Nine borehole ground system, Three heat pumps, Five storage tanks, Dry coolers.

  • New test facility can be used to:

Develop and validate models, Study optimization parameters for simple & hybrid GSHP systems, Conduct thermal response tests (TRTs).

NEW GSHP TEST FACILITY

EFFSYS 2 meeting 2010-06-10

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SLIDE 18

Building Services Engineering CHALMERS No. Undisturbed ground temperature Thermal response test BH1 2009-12-03 (45 minutes) 2009-12-03 – 2009-12-07 (75 hours) BH9 2009-12-10 (35 minutes) 2009-12-10 – 2009-12-15 (98 hours) BH2 2009-12-18 (75 minutes) 2009-12-18 – 2009-12-21 (54 hours) BH3 2009-12-24 (30 minutes) 2009-12-24 – 2010-01-07 (267 hours) BH6 2010-01-14 (60 minutes) 2010-01-14 – 2010-01-18 (91 hours) BH4 2010-02-02 (60 minutes) 2010-02-02 – 2010-02-04 (48 hours) BH8 2010-02-05 (40 minutes) 2010-02-05 – 2010-02-08 (69 hours) BH7 2010-02-09 (30 minutes) 2010-02-09 – 2010-02-11 (48 hours) BH5 2010-02-12 (45 minutes) 2010-02-12 – 2010-02-15 (68 hours)

TRTS: SEQUENCE AND DURATION

EFFSYS 2 meeting 2010-06-10

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SLIDE 19

Building Services Engineering CHALMERS

TRTS: RESULTS

  • Undisturbed Ground Temperature: 8.2 → 9.2 °C
  • Ground Thermal Conductivity: 3.01 ± 7% W/(m·K)
  • Borehole Thermal Resistance: 0.056 ± 0.012 (m·K)/W

EFFSYS 2 meeting 2010-06-10

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SLIDE 20

Building Services Engineering CHALMERS Factors Uncertainty in estimated λs Uncertainty in estimated Rb Test duration between 50 and 100 hours ± 4 % ± 3 % Power fluctuations of ± 1 % ± 1 % ± 1 % Temperature measurement uncertainty of ± 0.15 K < ±1 % < ±1 % Uncertainty of ± 0.9 K in undisturbed ground temperature measurement

  • ± 25 %

Uncertainty of ± 15 % in the volumetric heat capacity

  • ± 8 %

Borehole geometry ± 1 % uncertainty in borehole depth ± 1 % < ±1 % ± 1 % uncertainty in borehole radius

  • ± 8 %

Estimation method ± 2.5 % ± 10 %

TRTS: UNCERTAINTY ANALYSIS

EFFSYS 2 meeting 2010-06-10

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SLIDE 21

Building Services Engineering CHALMERS

TRT ESTIMATIONS: EFFECTS ON BOREHOLE SYSTEM DESIGN

20 25 30 35 5 10 15 20 25 Mean Fluid Temperature (deg C) Years Set 1A Set 2A Set 3A Set 4A Set 5A Set 6A Set 7A Set 8A Set 9A

4 8 12 16 5 10 15 20 25 Fluid Temperature (deg C) Years

BH6 BH8 Maximum mean fluid temperature Minimum mean fluid temperature

Single Borehole System Multiple Borehole System

EFFSYS 2 meeting 2010-06-10

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SLIDE 22

Building Services Engineering CHALMERS

CONCLUSIONS

Conducted a state-of-the-art literature review. Presented different approaches to model multiple borehole systems. Developed new analytical and numerical methods. Conducted TRTs and uncertainty analysis.

EFFSYS 2 meeting 2010-06-10

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SLIDE 23

Building Services Engineering CHALMERS

  • Optimize
  • peration

and performance

  • f

GSHP systems.

  • Develop new TRT evaluation method to shorten test

duration.

  • Investigate of new operation and control strategies for

simple and hybrid GSHP systems.

  • Study long and short term borehole response of

laboratory borehole system.

PLANNED FUTURE WORK

EFFSYS 2 meeting 2010-06-10

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SLIDE 24

Building Services Engineering CHALMERS

  • Javed, S, 2010. Design of ground source heat pump systems – Thermal modelling and

evaluation of boreholes. Licentiate thesis, Building service engineering, Chalmers university of technology, Sweden.

  • Javed, S and Fahlén, P, 2010. Development and planned operation of a ground source

heat pump test facility. Newsletter IEA heat pump centre, vol. 28, no. 1/2010, pp. 32-35.

  • Javed, S, Claesson, J and Fahlén, P, 2010. Analytical modelling of short-term response
  • f ground heat exchangers in ground source heat pump systems. 10th REHVA world

congress; Clima 2010, May 9-12, Antalya, Turkey.

  • 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
  • f heat flow models. Proceedings of 11th international conference on thermal energy

storage; Effstock 2009, Stockholm, Sweden. June 14-17.

PUBLICATIONS

EFFSYS 2 meeting 2010-06-10

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SLIDE 25

Building Services Engineering CHALMERS

  • Claesson, J, In press. Radial heat flow for a pipe in a borehole in ground using Lapalce

solutions - Mathematical Background Report. (Building Technology, Chalmers University

  • f Technology.) Sweden.
  • Fahlén, P, 2009. The laboratory facility of building services engineering - Supply systems

for heating and cooling. R2009:03, (Building Services Engineering, Chalmers University

  • f Technology.) Sweden.
  • 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.).

PUBLICATIONS

EFFSYS 2 meeting 2010-06-10

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Building Services Engineering CHALMERS

EFFSYS 2 meeting 2010-06-10

QUESTIONS / COMMENTS

THANK YOU!