English

This paper reports on research to analyze the indoor air quality (IAQ) and the concentration and varying patterns of CO2, formaldehyde and TVOC in commercial buildings located in Chongqing, South-West China. Two buildings were monitored during the day over two weeks in the summer period. One was a completed building that had been fully operational for several years. This building is termed the ‘non-renovated’ building. The other was a commercial building of similar age that was currently undergoing renovation on one of the main retail floors.

The aim of this study was to determine the concentration of Legionella pneumophila in the surface dust of the air ducts of central air conditioning systems and evaluate its effects on indoor air quality. Thirty dust samples were collected from thirty air ducts and analyzed using real-time TaqMan PCR targeting the mipgene.

A heat recovery ventilator (HRV) is used to create a balanced ventilation system in residential buildings and as an energy-saving measure. HRVs bring in outside air which is tempered with outgoing stale air, with only the small energy penalty of the blower power to overcome the pressure drop in the HRV. HRVs have been used in cold climates and have often performed poorly due to frosting failure.

These regulations and guidelines constitute a part of the National Building Code of Finland as prescribed in resolution (867/75) by the Ministry of the Interior. These regulations and guidelines replace the regulations and guidelines on building ventilation (D2) given on the 27th day of October, 1978. The new regulations and guidelines shall come into effect on the 1st day of January, 1988, and they shall apply to all building for which permit has been applied on or after that date.

Papers presented at the the CIBS Symposium "Natural ventilation by design" London 2nd December 1980

This Newsletter released by the Chartered Institution of Building Services Engineers (CIBSE) Natural Ventilation Group (NVG) Management Committee, aims to inform members and potential members of the work being undertaken by the Group to benefit the discipline of natural ventilation within CIBSE.

Contents include:

• Overheating corridors: Performance of mitigation actions measured;
• Using the new CIBSE design summer years to assess overheating in London;
• UK joins the Air Infiltration and Ventilation Centre.

The paper at hand collects research findings on the impact of air flow on the thermal performance of pitched roof assemblies. Air flows in these components are typically a mixture of: 1) in/exfiltration, 2) natural convection and 3) wind-washing. In the current building practice the necessity of an air barrier to guarantee the thermal and hygric performance of roofs is well established. Yet the need for a continuous wind barrier to avoid wind-washing of the insulation layer is still often underestimated in practice.

Against the background of increased global demands for energy efficiency, property owners should raise the standards of ductwork systems for ventilation, heating and air conditioning. This would not only save energy, but also mean lower installation costs, shorter assembly times and better air quality thanks to less leakage. The importance of energy-efficient buildings will increase in the future, not only due to rising electricity prices, but also due to increased environmental awareness.

This presentation will explain what exactly calibration should mean. It will also look into the hierarchy of and the differences between the calibration labs of national standards, accredited labs (like DAkkS, a national government-appointed accreditation body in Germany, or Cofrac – Comité français d’accréditation – in France), and manufacturer’s calibration labs. Even the labs themselves must have their own measuring devices checked in order to guarantee what is known as traceability to national standards, and to determine the measurement uncertainty of their testing devices.