AIVC - Air Infiltration and Ventilation Centre

Search form


You are here

Home  |  air conditioning

New design of central units in air heating systems for heating and ventilation in domestic buildings.

Steimle F, Glimpel T, 1989
air conditioning
Bibliographic info: 10th AIVC Conference "Progress and trends in air infiltration and ventilation research" Espoo, Finland, 25-28 September 1989
Languages: English

In central units of air heating systems the supply air flow must meet the actual heating demand. Most of central units for air heating systems have only one fan , which is designed for the maximum air flow at the maximum heating capacity . Fan motors are designed for variable - voltage-drive to enable a reduction of air flow to the necessary value at different heating demands. However, the electrical efficiency is decreasing strongly. The supply air fan is working mostly under part - load conditions . Therefore the control strategy used now is very ineffective . It is suggested to install 2 fans in an air handling unit. One of them is working at full capacity all over the year , but the second one starts only to deliver the additional air flow required in case of higher heat demand. Charts basing on calculations will demonstrate the relation between outdoor air temperature and the demand of energy for both systems.

Related publications

This report summarizes the work of the initial working phase of IEA ECB Annex 62 Ventil
Maria Kolokotroni, Per Heiselberg, Lorenzo Pagliano, Jie Han, Regina Bokel, Peter Holzer, Annamaria Belleri, Denmark
This summary report presents insights on recommendations into how ventilative cooling i
Christoffer Plesner, Flourentzos Flourentzou, Guoqiang Zhang, Hilde Breesch, Per Heiselberg, Michal Pomianowski, Peter Holzer, Maria Kolokotroni, Annamaria Belleri, Denmark
Overheating in buildings is an emerging challenge at the design stage and during operat
Peter Holzer, Theofanis Psomas, Denmark