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

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Journal Title
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Conference article in proceedings
Date
2018-06-05
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Language
en
Pages
6
Series
Proceedings of Roomvent & Ventilation 2018, 2-5th of June 2018, Espoo, Finland
Abstract
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.
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Keywords
thermal environment, heat load, buoyancy flows, airflow interaction, air distribution
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Citation
Kilpeläinen , S , Lestinen , S , Kosonen , R , Jokisalo , J , Koskela , H , Mustakallio , P & Melikov , A 2018 , Experimental comparison of three indoor thermal environment control methods: diffuse ceiling ventilation, chilled beam system and chilled ceiling combined with mixing ventilation . in R Kosonen , M Ahola & J Narvanne (eds) , Proceedings of Roomvent & Ventilation 2018, 2-5th of June 2018, Espoo, Finland . SIY Sisäilmatieto Oy , Roomvent & Ventilation Conference , Espoo , Finland , 02/06/2018 .