Submitted by Maria.Kapsalaki on Fri, 04/12/2019 - 15:33
Substantial energy is used to condition the air that enters California homes through leaks in the building envelope and ductwork - typically about a third of all heating and cooling. Reducing this through air sealing is essential to California achieving zero energy homes. However, this outdoor air also dilutes pollutants emitted inside homes and contributes to a healthy indoor environment and acceptable indoor air quality (IAQ). To address this IAQ issue, California’s Title 24 Building Standards have required mechanical ventilation in new homes since 2008.
Submitted by Maria.Kapsalaki on Thu, 10/19/2017 - 11:03
The objective of present work was to develop the metric that assess the performance of solutions securing high indoor air quality in low-energy (modern) residential buildings. This was achieved by summarizing data on the levels and types of gaseous pollutants and particulate matter in low-energy buildings and comparing them with the existing exposure limits for pollutants.
Submitted by Maria.Kapsalaki on Wed, 09/06/2017 - 17:44
Because buildings are responsible for 40% of energy use and 36% of Greenhouse Gas (GHG) emissions in the EU, energy efficiency in buildings has become a priority to drastically reduce the energy use in buildings. Consequently, a number of policy measures have been implemented in European Member States to drive the market towards Nearly Zero-Energy Buildings, including the Energy Performance of Buildings Certificates (EPCs), which are the most visible instrument of the Energy Performance of Buildings Directive (EPBD).
Submitted by Maria.Kapsalaki on Thu, 09/19/2013 - 00:14
There exists a significant body of literature on energy and indoor air quality impacts of envelope leakage. In fact, this topic has been studied since the 70s and has lead to many publications, in particular within the Air Infiltration Centre established in 1979 that has become the Air Infiltration and Ventilation Center (AIVC) since 1987.
Submitted by Maria.Kapsalaki on Thu, 09/19/2013 - 00:12
Our lack of understanding of the health risks related to air pollutants exposure in buildings is perceived as a major deficiency, even though 80% of our time is spent indoors. In this context the Observatory on Indoor Air Quality (OQAI) has been set up by the French authorities to collect data on population exposure to indoor pollutants in various indoor environments (dwellings, schools, offices, sports and leisure centers, etc.) to be used for public policies development. Accordingly, OQAI undertook a national survey on indoor air quality in dwellings with a four-fold objective:
Submitted by Maria.Kapsalaki on Thu, 09/19/2013 - 00:11
Air tightness is an important property of building envelopes. It is a key factor in determining infiltration and related wall-performance properties such as indoor air quality, maintainability and moisture balance.
Air leakage in U.S. houses consumes roughly 1/3 of the HVAC energy but provides most of the ventilation used to control IAQ.
The Lawrence Berkeley National Laboratory has been gathering residential air leakage data from many sources and now has a database of more than 100,000 raw measurements.
Submitted by Maria.Kapsalaki on Thu, 09/19/2013 - 00:10
A survey was conducted to determine occupant use of windows and mechanical ventilation devices; barriers that inhibit their use; satisfaction with indoor air quality (IAQ); and the relationship between these factors.
A questionnaire was mailed to a stratified random sample of 4,972 single-family detached homes built in 2003, and 1,448 responses were received. A convenience sample of 230 houses known to have mechanical ventilation systems resulted in another 67 completed interviews.
This report has been produced in the framework of the EU RESHYVENT project (Cluster Project on Demand Controlled Hybrid Ventilation in Residential Buildings with Specific Emphasis on the Integration of Renewables).