Submitted by Maria.Kapsalaki on Thu, 11/23/2017 - 09:27
Wind pressure and thermal forces are driving forces for pressure difference on the building envelope. In European and German standards infiltration is calculated using wind speed, temperature difference and wind pressure coefficients resulting from upstream and downstream flow on the building envelope. This long term measurements shall present measured pressure differences on the building envelope in comparison to those calculations
Submitted by Maria.Kapsalaki on Thu, 11/23/2017 - 09:27
With lower air leakage in modern homes, ventilation of homes has become more important than ever before. It seems however that we are getting it very wrong. A lack of ventilation can cause building sickness, with degradation of the physical building and also poor air quality which has a big impact on the occupants themselves. Our statistics show that designers and contractors are still not getting it right, leaving us with a generation of poorly ventilated housing stock.
The International Energy Agency's Energy in Buildings and Communities (IEA-EBC) Programme newsletter of November 2017 (Issue 66) has been released. The current edition includes an introduction of Canadian policies and movements, also with updates on EBC’s major R&D projects that cover ways to realise both better indoor air quality and higher energy efficiency, reconsideration of thermal comfort by using energy more wisely, and analysis of real energy use and relevant factors by using big data.
Submitted by Maria.Kapsalaki on Thu, 10/19/2017 - 16:56
The current development in building energy efficiency towards nZEB buildings represents a number of new challenges to design and construction. One of these major challenges is the increased need for cooling in these highly insulated and airtight buildings, which is not only present in the summer period but also in the shoulder seasons and in offices even in midwinter. Ventilative cooling can be an energy efficient solution to address this cooling challenge in buildings.
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.
The evaluation questionnaire of the 38th AIVC conference: “Ventilating healthy low-energy buildings” held in Nottingham-UK on September 13-14, 2017, was sent out to 170 attendees of the event. A summary of the results with feedback from 90 of the participants is now available here.
The “ASHRAE HVAC Duct Sizer” application designed by Carmel Software Corporation for ASHRAE, allows the user to quickly size one HVAC duct run or a range of duct sizes using the constant friction method.
In the "Size by Airflow" mode, the user can specify the total airflow in CFM (or L/s), the aspect ratio and one of either the velocity of air or the friction loss per 100 feet (30 meters). The results include both the exact and rounded height and width (or diameter) dimensions and the calculated velocity and friction loss.
Login