Modelling of vertical temperature gradient with displacement ventilation

Natalia Lastovets, Risto Kosonen, Panu Mustakallio

Research output: Chapter in Book/Report/Conference proceedingConference contributionScientificpeer-review


Vertical temperature gradient prediction is essential for designing of displacement ventilation airflow rate. Several simplified nodal models were developed to estimate the temperature stratification in rooms with displacement ventilation. Typically, the temperature gradient is modelled to be linear over the room height. The simplified multi-nodal models allow different slopes for the temperature profile between the nodes and predict the accurate temperature
gradient for many buoyant flow elements. However, all the current models failed to estimate the temperature gradient in a room with heat loads from window and high-level heat gains. The novel four-nodal model was proposed to calculate th
e temperature gradient in a room with various single flow elements and combinations of them. The measurement data was compared with the currently existing nodal models and the proposed four-nodal model. The proposed model gives good prediction for all types and combinations of heat loads.
Original languageEnglish
Title of host publicationProceedings of the Conference Healthy Buildings 2017 Europe
Number of pages6
ISBN (Electronic)978-83-7947-232-1
Publication statusPublished - 2017
MoE publication typeA4 Article in a conference publication
EventHealthy Buildings Europe - Lublin, Poland
Duration: 2 Jul 20175 Jul 2017


ConferenceHealthy Buildings Europe
Abbreviated titleHB
Internet address


  • displacement ventilation
  • thermal plume
  • nodal model
  • energy efficiency
  • temperature gradient


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