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Tillämpning och simulering av naturlig ventilation: Potential för utnyttjande i kontorsrum
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Physics.
2014 (Swedish)Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

Mechanical ventilation is the most common type of

ventilation in newly constructed office buildings. There

has been an interest to utilize natural ventilation

instead of mechanical ventilation among architects and

HVAC consultants in recent years. This is due to the

size of mechanical ventilation systems, which are

space consuming. The mechanical ventilation system is

also complex and requires maintenance. Furthermore,

the fan uses a considerable amount of energy. Natural

ventilation is an alternative not affecting the rentable

floor space. The basic idea of natural ventilation is to

use a technique where natural forces such as wind and

thermal gradients fully handle the ventilation.

The software program IDA ICE was used to simulate

the natural ventilation by advanced window control in

offices and to investigate if natural ventilation is a

good option to conventional systems regarding indoor

climate and energy use. The indoor temperature and

the concentration of carbon dioxide control the

window opening. A CAC (Clean Air Control)- sensor

was also used instead of a traditional CO2-sensor,

which is a sensor that regulates the airflow according

to the level of air pollution.

The results show that natural ventilation with advanced

window control cannot always achieve the regulatory

requirements for the highest carbon dioxide content of

1000 ppm, since the airflow is not sufficient. On these

occasions a fan is required to provide a good indoor

climate. An interesting observation is that the energy

use for heating is only 38% larger for the office rooms

with natural ventilation compared with mechanically

ventilated offices. Even though the heat energy are

released to the outdoor environment and not

recovered in the naturally ventilated room.

Place, publisher, year, edition, pages
UPTEC ES, ISSN 1650-8300 ; 14037
National Category
Civil Engineering Building Technologies
URN: urn:nbn:se:uu:diva-233222OAI: diva2:751120
Educational program
Master Programme in Energy Systems Engineering
Available from: 2015-06-24 Created: 2014-10-01 Last updated: 2015-06-24Bibliographically approved

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