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Utilization of heat recovery ventilation : steady-state two-zone heat loss analysis and field studies

Arnold Janssens (UGent) , Wolf Bracke (UGent) , Marc Delghust (UGent) , Eline Himpe (UGent) , Silke Verbruggen (UGent) and Jelle Laverge (UGent)
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Abstract
In new houses in Europe the share of mechanical ventilation with heat recovery is increasing as a result of more severe energy performance requirements and of energy labelling for residential ventilation units. The methods used to assess the influence of heat recovery ventilation on the heating energy use in energy labelling and certification are typically based on single zone energy balance equations, although heating behaviour and set-points differ in different rooms of a dwelling. As a result of this the energy savings of heat recovery ventilation as assessed with single zone methods may be larger than when the spatial variations in dwellings are taken into account. This is related to the fact that the recovered heat supplied to the dwelling through the ventilation system is not 'useful' to reduce space heating and cooling demand at all time and in every room. A two-zone steady-state heat loss analysis was conducted to investigate the relation between spatial variations in a dwelling and the utilization of heat recovery. One zone represents the rooms in a house which are regularly heated and are typically equipped with heat emitters and local controls. The other zone represents the rooms which are rarely heated or have no individual heat emitters or controls. The results show the differences between a single zone and two-zone approach in terms of the effects of heat recovery ventilation on building heat loss, and define the main influencing parameters for the utilization of heat recovery in residential ventilation systems. The analysis is supported by results of a field study where energy use in 114 low-energy houses was monitored. Half of the houses had mechanical ventilation systems with heat recovery, while the other half had demand-controlled mechanical extract ventilation. Apart from the differences in ventilation systems, the houses were largely identical.
Keywords
Heat recovery ventilation, Building heat loss, Temperature zoning, Energy performance

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Chicago
Janssens, Arnold, Wolf Bracke, Marc Delghust, Eline Himpe, Silke Verbruggen, and Jelle Laverge. 2018. “Utilization of Heat Recovery Ventilation : Steady-state Two-zone Heat Loss Analysis and Field Studies.” In Proceedings of the 7th International Building Physics Conference, 691–696. Syracuse.
APA
Janssens, Arnold, Bracke, W., Delghust, M., Himpe, E., Verbruggen, S., & Laverge, J. (2018). Utilization of heat recovery ventilation : steady-state two-zone heat loss analysis and field studies. Proceedings of the 7th International Building Physics Conference (pp. 691–696). Presented at the 7th international Buidling Physics conference (IBPC 2018), Syracuse.
Vancouver
1.
Janssens A, Bracke W, Delghust M, Himpe E, Verbruggen S, Laverge J. Utilization of heat recovery ventilation : steady-state two-zone heat loss analysis and field studies. Proceedings of the 7th International Building Physics Conference. Syracuse; 2018. p. 691–6.
MLA
Janssens, Arnold et al. “Utilization of Heat Recovery Ventilation : Steady-state Two-zone Heat Loss Analysis and Field Studies.” Proceedings of the 7th International Building Physics Conference. Syracuse, 2018. 691–696. Print.
@inproceedings{8589639,
  abstract     = {In new houses in Europe the share of mechanical ventilation with heat recovery is increasing as  a  result  of  more  severe  energy  performance  requirements  and  of  energy  labelling  for residential  ventilation  units.  The  methods  used  to  assess  the  influence  of  heat  recovery ventilation on the heating energy use in energy labelling and certification are typically based on single zone energy balance equations, although heating behaviour and set-points differ in different  rooms  of  a  dwelling.  As  a  result  of  this  the  energy  savings  of  heat  recovery ventilation  as  assessed  with  single  zone  methods  may  be  larger  than  when  the  spatial variations in dwellings  are taken into account. This is related to the fact that the recovered heat supplied to the dwelling through the ventilation system is not 'useful' to reduce space heating and cooling demand at all time and in every room.
A two-zone steady-state heat loss analysis was conducted to investigate the relation between spatial variations in a dwelling and the utilization of heat recovery. One zone represents the rooms in a house which are regularly heated and are typically equipped with heat emitters and local  controls.  The  other  zone  represents  the  rooms  which  are  rarely  heated  or  have  no individual heat emitters or controls.
The results show the differences between a single zone and two-zone approach in terms of the effects  of  heat  recovery  ventilation  on  building  heat  loss,  and  define  the  main  influencing parameters for the utilization of heat recovery in residential ventilation systems. The  analysis  is  supported  by  results  of  a  field  study  where  energy  use  in  114  low-energy houses  was  monitored.  Half  of  the  houses  had  mechanical  ventilation  systems  with  heat recovery,  while  the  other  half  had  demand-controlled  mechanical  extract  ventilation.  Apart from the differences in ventilation systems, the houses were largely identical.},
  author       = {Janssens, Arnold and Bracke, Wolf and Delghust, Marc and Himpe, Eline and Verbruggen, Silke and Laverge, Jelle},
  booktitle    = {Proceedings of the 7th International Building Physics Conference},
  isbn         = {9781510890022},
  keywords     = {Heat recovery ventilation,Building heat loss,Temperature zoning,Energy performance},
  language     = {eng},
  location     = {Syracuse, NY, USA},
  pages        = {691--696},
  title        = {Utilization of heat recovery ventilation : steady-state two-zone heat loss analysis and field studies},
  url          = {http://ibpc2018.org/},
  year         = {2018},
}