Development and application of test cases for comparing vertical ground heat exchanger models

M. Bernier, M. Kummert, S. Bertagnolio

Research output: Contribution to conferencePaper

6 Citations (Scopus)

Abstract

The main objective of this paper is to establish a set of test cases for analytical verifications and intermodel comparisons of ground heat exchanger (GHX) models used in building simulation programs. Several test cases are suggested. They range from steady-state heat rejection in a single borehole to varying hourly loads with large yearly thermal imbalance in multiple borehole configurations. The usefulness of the proposed test cases is illustrated by running them with different GHX models. This comparison exercise has shown that 1-D models compare favourably well with the more elaborate 3-D models for relatively small simulation periods. The cyclic heat rejection/collection test has revealed some small deficiency in the load aggregation scheme of a particular model. Finally, the use of the asymmetric (cooling-dominated) load profile test case for a bore field composed of 100 boreholes revealed that the borehole wall temperature predicted by two GHX models can differ by as much as 10oC after a 30 year simulation.

Conference

ConferenceInternational Building Performance Simulation Association (IBPSA) Conference 2007
CityBeijing, China
Period3/09/076/09/07

Fingerprint

Heat exchangers
Boreholes
Agglomeration
Cooling
Temperature
Hot Temperature

Keywords

  • modeling
  • ground heat exchanger
  • simulations
  • test cases
  • heat pumps

Cite this

Bernier, M., Kummert, M., & Bertagnolio, S. (2007). Development and application of test cases for comparing vertical ground heat exchanger models. Paper presented at International Building Performance Simulation Association (IBPSA) Conference 2007, Beijing, China, .
Bernier, M. ; Kummert, M. ; Bertagnolio, S. / Development and application of test cases for comparing vertical ground heat exchanger models. Paper presented at International Building Performance Simulation Association (IBPSA) Conference 2007, Beijing, China, .
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author = "M. Bernier and M. Kummert and S. Bertagnolio",
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language = "English",
note = "International Building Performance Simulation Association (IBPSA) Conference 2007 ; Conference date: 03-09-2007 Through 06-09-2007",

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Bernier, M, Kummert, M & Bertagnolio, S 2007, 'Development and application of test cases for comparing vertical ground heat exchanger models' Paper presented at International Building Performance Simulation Association (IBPSA) Conference 2007, Beijing, China, 3/09/07 - 6/09/07, .

Development and application of test cases for comparing vertical ground heat exchanger models. / Bernier, M.; Kummert, M.; Bertagnolio, S.

2007. Paper presented at International Building Performance Simulation Association (IBPSA) Conference 2007, Beijing, China, .

Research output: Contribution to conferencePaper

TY - CONF

T1 - Development and application of test cases for comparing vertical ground heat exchanger models

AU - Bernier, M.

AU - Kummert, M.

AU - Bertagnolio, S.

PY - 2007/9

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N2 - The main objective of this paper is to establish a set of test cases for analytical verifications and intermodel comparisons of ground heat exchanger (GHX) models used in building simulation programs. Several test cases are suggested. They range from steady-state heat rejection in a single borehole to varying hourly loads with large yearly thermal imbalance in multiple borehole configurations. The usefulness of the proposed test cases is illustrated by running them with different GHX models. This comparison exercise has shown that 1-D models compare favourably well with the more elaborate 3-D models for relatively small simulation periods. The cyclic heat rejection/collection test has revealed some small deficiency in the load aggregation scheme of a particular model. Finally, the use of the asymmetric (cooling-dominated) load profile test case for a bore field composed of 100 boreholes revealed that the borehole wall temperature predicted by two GHX models can differ by as much as 10oC after a 30 year simulation.

AB - The main objective of this paper is to establish a set of test cases for analytical verifications and intermodel comparisons of ground heat exchanger (GHX) models used in building simulation programs. Several test cases are suggested. They range from steady-state heat rejection in a single borehole to varying hourly loads with large yearly thermal imbalance in multiple borehole configurations. The usefulness of the proposed test cases is illustrated by running them with different GHX models. This comparison exercise has shown that 1-D models compare favourably well with the more elaborate 3-D models for relatively small simulation periods. The cyclic heat rejection/collection test has revealed some small deficiency in the load aggregation scheme of a particular model. Finally, the use of the asymmetric (cooling-dominated) load profile test case for a bore field composed of 100 boreholes revealed that the borehole wall temperature predicted by two GHX models can differ by as much as 10oC after a 30 year simulation.

KW - modeling

KW - ground heat exchanger

KW - simulations

KW - test cases

KW - heat pumps

UR - http://www.ibpsa.org/m_papers.asp

UR - http://www.mecheng.strath.ac.uk/staffprofile.asp?id=137

UR - http://www.ibpsa.org/proceedings/BS2007/p500_final.pdf

M3 - Paper

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Bernier M, Kummert M, Bertagnolio S. Development and application of test cases for comparing vertical ground heat exchanger models. 2007. Paper presented at International Building Performance Simulation Association (IBPSA) Conference 2007, Beijing, China, .