measurement

Duct leakage in forced-air distribution systems has been recognized for years as a major source of energy losses in residential buildings. Unfortunately, the distribution of leakage across homes is far from uniform, and measuring duct leakage under normal operating conditions has proven to be difficult.

This paper presents the results of four thermal comfort surveys conducted in naturally ventilated and air-conditioned buildings located in Bari, in southern Italy, during winter and summer seasons. The buildings were of different types, including offices, lecture rooms, and library reading rooms. The

The cleaning of HVAC systems aims at removing contaminants and re-establishing the function of the system of ventilation.A measurement method for ventilation cleanliness is discussed in this paper. It is based on measuring the dust deposits inside ducts. Comparison of that HVAC cleanliness method is made with others.

Capture hoods are the most common measuring method for volumetric air flows from exhaust. The hoods have been continuously improved in order to prevent some deviations from calibrated values. In most cases a satisfactory accuracy can be achieved by this measuring method.

This paper provides scientific evidence that electrified homes in South African rural villages have lower levels of air pollution compared to the non-electrified homes using fuel or wood. The measured air pollutants were RSP (stationary respirable particulate matter), the CO in the kitchen and the CO on the child.

In hot summer days, in Bucharest the air temperature is over 36°C and the relative humidity exceeds 50 %. That explains the big air-conditioning demand for tertiary buildings. This paper deals with an experimental and a numerical investigation of an air-c

In the course of laboratory investigation we examined the adaptability of naive panels onindoor air quality measurements. We made the investigation on a measuring team of 45participants. We examined the measurement precision and standard deviation of themeasuring team with the help of Olf-Box. Our results show that despite the economicefficiency the number of persons in a measuring team cannot be reduced to less than 30subjects. We built a measuring system to examine the emission of indoor used materials.

A nationwide survey on indoor air quality will be set up in France in 2003-2004. The aim ofthe survey is to assess household exposure to indoor air pollutants. The target population isthe national housing stock of approximately 24 million permanently occupied housing units.A nationally representative sample of dwellings will be selected based on a three-stagesampling design. At the first stage, the Primary Sampling Units (PSUs) are categorized basedon French territorial divisions. The second stage of the design is the sampling of segmentswithin the PSUs.

Protecting immune suppressed patients from construction generated airborne opportunisticinfectious agents is essential during their hospitalization. During modernization of thehospitals 32-bed bone marrow transplant unit (BMTU), an empty intensive care unit wasretrofitted to BMT ventilation criteria. Filtration, pressurization and room air exchangecriteria were required at 12/h. A condensate particle counter and a digitalpressure gauge were used to assess these criteria.

Two similar blocks of flats have been built for people with respiratory diseases. The buildingshave a clean and effective ventilation system and low emitting building materials. Theventilation system is a centralized supply and exhaust air system, either based on demand(Building A) or user controlled (Building B). Total volatile organic compound (TVOC) levelsand concentrations of ammonia and formaldehyde were measured in one apartment on each ofthe six floors of both buildings before occupants moved in and after 3 and 7 months and afterone year of occupancy.