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Comparison of pipe models to simulate legionella concentration in domestic hot water

Elisa Van Kenhove (UGent) , Arnold Janssens (UGent) and Jelle Laverge (UGent)
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Abstract
The production of Domestic Hot Water (DHW) dominates the total energy demand in well-insulated and airtight buildings because DHW is produced above 55- 60°C to kill Legionella pneumophila. This temperature has a negative effect on the efficiency of DHW production units. A simulation model is developed that allows to investigate the infection risk for Legionella pneumophila in the design phase of a DHW system and to test the effectiveness of thermal disinfection. Different existing Modelica pipe models are investigated to select useful models that can be extended with equations for simulation of bacterial growth in DHW. When implementing the adapted pipe model in a DHW recirculation system, simulation results show that energy use can be reduced by 34% without increasing infection risk. By developing a simulation model, HVAC designers will be able to assess the infection risk associated with their design and to optimize temperature regimes to reduce the energy demand for DHW production.

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Citation

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MLA
Van Kenhove, Elisa, Arnold Janssens, and Jelle Laverge. “Comparison of Pipe Models to Simulate Legionella Concentration in Domestic Hot Water.” Proceedings of the 15th IBPSA Conference. Ed. Charles S Barnaby & Michael Wetter. 2017. 1979–1988. Print.
APA
Van Kenhove, E., Janssens, A., & Laverge, J. (2017). Comparison of pipe models to simulate legionella concentration in domestic hot water. In C. S. Barnaby & M. Wetter (Eds.), Proceedings of the 15th IBPSA conference (pp. 1979–1988). Presented at the Building Simulation 2017.
Chicago author-date
Van Kenhove, Elisa, Arnold Janssens, and Jelle Laverge. 2017. “Comparison of Pipe Models to Simulate Legionella Concentration in Domestic Hot Water.” In Proceedings of the 15th IBPSA Conference, ed. Charles S Barnaby and Michael Wetter, 1979–1988.
Chicago author-date (all authors)
Van Kenhove, Elisa, Arnold Janssens, and Jelle Laverge. 2017. “Comparison of Pipe Models to Simulate Legionella Concentration in Domestic Hot Water.” In Proceedings of the 15th IBPSA Conference, ed. Charles S Barnaby and Michael Wetter, 1979–1988.
Vancouver
1.
Van Kenhove E, Janssens A, Laverge J. Comparison of pipe models to simulate legionella concentration in domestic hot water. In: Barnaby CS, Wetter M, editors. Proceedings of the 15th IBPSA conference. 2017. p. 1979–88.
IEEE
[1]
E. Van Kenhove, A. Janssens, and J. Laverge, “Comparison of pipe models to simulate legionella concentration in domestic hot water,” in Proceedings of the 15th IBPSA conference, San Francisco, 2017, pp. 1979–1988.
@inproceedings{8579255,
  abstract     = {The production of Domestic Hot Water (DHW)
dominates the total energy demand in well-insulated and
airtight buildings because DHW is produced above 55-
60°C to kill Legionella pneumophila. This temperature
has a negative effect on the efficiency of DHW production
units.
A simulation model is developed that allows to
investigate the infection risk for Legionella pneumophila
in the design phase of a DHW system and to test the
effectiveness of thermal disinfection. Different existing
Modelica pipe models are investigated to select useful
models that can be extended with equations for simulation
of bacterial growth in DHW. When implementing the
adapted pipe model in a DHW recirculation system,
simulation results show that energy use can be reduced by
34% without increasing infection risk.
By developing a simulation model, HVAC designers will
be able to assess the infection risk associated with their
design and to optimize temperature regimes to reduce the
energy demand for DHW production.},
  author       = {Van Kenhove, Elisa and Janssens, Arnold and Laverge, Jelle},
  booktitle    = {Proceedings of the 15th IBPSA conference},
  editor       = {Barnaby, Charles S and Wetter, Michael},
  isbn         = {978-1-7750520-0-5},
  issn         = {2522-2708},
  language     = {eng},
  location     = {San Francisco},
  pages        = {1979--1988},
  title        = {Comparison of pipe models to simulate legionella concentration in domestic hot water},
  year         = {2017},
}