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The effects of air distribution on indoor climate quality in Finnish apartment building
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Journal Title
Journal ISSN
Volume Title
Insinööritieteiden korkeakoulu |
Master's thesis
Electronic archive copy is available via Aalto Thesis Database.
Authors
Date
Department
Mcode
ENG3068
Degree programme
Language
en
Pages
85 + 5
Series
Abstract
People spend almost 90% of their time in residential environments and consume 15-20 m3 of indoor air per day. They have a right to live in an indoor environment that does not endanger their health. Thus, the indoor environment is a significant concern because indoor air quality and thermal comfort are essential parameters for indicating human well-being. This thesis aims to improve Finnish multiple apartment buildings’ indoor environment by applying the CFD method to investigate and compare how different air distribution systems function. To achieve this aim, this thesis firstly researches on how to access thermal comfort and indoor air quality by using CFD. The predicted mean vote, predicted percentage dissatisfied, draught rate, ventilation efficiency, and CO2 concentration level are parameters to compare among the study cases. Secondly, the CFD model is created using Ansys Fluent to study the flow field in a typical apartment by changing different airflow rates and supply air temperature. Finally, different air distribution settings are suggested to achieve different Finnish
classification of the indoor environment.
As a result, when increasing the supply airflow rate in winter conditions, the average volume operative temperature and PMV value at the human surface decreased. The draught rate at the human surface is low in all cases, which shows a low effect from changing the supply airflow rate. A higher supply airflow rate reduces the CO2 concentration level due to the increasing air exchange rate. The ventilation efficiency does not show any significant effect due to the changing of the supply airflow rate. Increasing the occupants’ number introduces extra internal heat gain from the human body and extra CO2 emitted to the living space. A higher airflow rate can reduce the CO2 concentration in volume but does not affect occupants’ thermal comfort.
Description
Supervisor
Kosonen, RistoThesis advisor
Nikolski, EvgenyBöök, Mats