Experimental comparison of three indoor thermal environment control methods: diffuse ceiling ventilation, chilled beam system and chilled ceiling combined with mixing ventilation

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


Research units

  • Halton Oy
  • Technical University of Denmark
  • Turku University of Applied Sciences


Thermal environments created by diffuse ceiling ventilation (DCV), chilled beam system (CB) and chilled ceiling with mixing ventilation (CCMV) were compared at different heat loads. Experiments were carried out in two test rooms (4.1 x 4.2 x 2.9 m3 and 5.5 x 3.8 x 3.2 m3, L x W x H). A double office layout where workstations were located in the perimeter area was investigated. The heat load was increased from a usual level of 38-40 W/floor-m2 to a peak load level of 57-64 W/floor-m2. Air temperature in the occupied zone was kept at 26 ± 0.5°C. Air velocity and temperature were measured with omnidirectional anemometers. Mean air speed, draught rate and temperature differences were all low at the usual load and increased slightly at peak load. The CB system produced more locations with draught rates higher than 10% than the CCMV or DCV systems. Thus, the study suggests using radiant systems with air distribution to reduce draught discomfort in the modern indoor environments.


Original languageEnglish
Title of host publicationProceedings of Roomvent & Ventilation 2018, 2-5th of June 2018, Espoo, Finland
EditorsRisto Kosonen, Mervi Ahola, Jarkko Narvanne
Publication statusPublished - 5 Jun 2018
MoE publication typeA4 Article in a conference publication
EventRoomvent & Ventilation
- Espoo, Finland
Duration: 2 Jun 20185 Jun 2018


ConferenceRoomvent & Ventilation

    Research areas

  • thermal environment, heat load, buoyancy flows, airflow interaction, air distribution

ID: 25896507