local ventilation; thermal comfort; local ventilation effectiveness; ability to remove pollutant; climatic chamber
Abstract :
[en] In decentralized mechanical ventilation, air supply being very close to exhaust, a
short-circuit from supply towards the extraction point may occur, increasing energy
consumption and decreasing air diffusion quality. To estimate this quality together
with thermal comfort, we measured in a climatic chamber, thermal comfort
parameters and local ventilation effectiveness for temperature, at 12 locations and 3
heights within the occupied zone, for 4 ventilation regimes and 3 thermal
configurations of the climatic chamber. We also assessed the system ability to
remove carbon dioxide.
The results show that the maximum air velocity measured is 0.12m/s, the predicted
mean votes fluctuate from -0.8 to - 0.5 and local ventilation effectiveness is from 0.94
to 1. In addition, the decentralized system maintains carbon dioxide concentration
below 1250ppm for most configurations tested. The predicted mean votes are quite
low because the heating set point is also quite low: 20°C. We conclude that no
thermal discomfort can be felt, the system has a great ability to remove pollutants,
and the risk that a short-circuit occurs is low.
Disciplines :
Energy
Author, co-author :
Ajaji, Youness
Andre, Philippe ; Université de Liège > DER Sc. et gest. de l'environnement (Arlon Campus Environ.) > Building Energy Monitoring and Simulation (BEMS)
Language :
English
Title :
A Decentralized Mechanical Ventilation System with Heat Recovery: Experimental Assessment of Thermal Comfort and Pollutant Removal Ability
Publication date :
2013
Number of pages :
11
Event name :
11th REHVA World Congress Energy efficient, smart and healthy buildings
