Looks at some studies that have been done to see if the retrofits have actually changed indoor air quality and changed pollutant concentrations. The first study (1981) of 18 homes in Washington state used the house doctor technique. The second study was of two homes in Medford, Oregon and one in Cranbury, New Jersey, all monitored for two weeks. The third study was of two identical houses in Rockville, Maryland, monitored over a year. One of them was retrofitted using the house doctor technique, as a result of which air leakage dropped by 40%. A fourth study of fifty houses is mentioned.
The recommended limits for formaldehyde in indoor air are 0.1 ppm (0.12mgm-3). There are several ways of measuring the formaldehyde concentration, including sampling tubes. Describes a newly-developed sampling tube measurement technique capable of detecting formaldehyde concentrations from 0.04 to 2.5ppm.
Describes the instrumentation and measurement technique used by the CSTB to measure the leakiness of residential buildings. Results of the experiments are also presented.
A test chamber was designed and constructed at Princeton University for research purposes. The structure is essentially a miniature house, with no internal partitions, built with simplicity and uniformity in mind. Also thetest chamber was built to have minimal infiltration rates, and with versatility to facilitate experimentation. The test chamber is a tool to study subtle effects in the thermal performance of structures.
This paper describes an original investigation of a new flowmeter and a method of balancing of airflow circuits in low pressure ventilating systems. The flowmeter is simple and robust in its construction, imposes virtually no resistance to
The problem of describing quantitatively the effective ventilation in a room when the air within the room is imperfectly mixed is discussed. It is suggested that the protection afforded by the ventilation to any given position against air
Unnecessary air infiltration ,draftiness, in buildings can be a major cause for excessive energy consumption. A method for using sound to locate, for subsequent sealing, the openings of air infiltration leakage paths in buildings has been investigated. The results of pertinent analytical studies, laboratory experiments, and field applications of this acoustic location method are reported, and a plan is provided to encourage national implementation of the method.
The calibration and use of a shielded dual sensor hot-wire probe, originally developed at McGill University for velocity measurement in highly turbulent and reversing flows, is described. The new probe permits measurements to be made in flow conditions which are not amenable to conventional hot-wire techniques. Two conventional hot-wire anemometers are used to drive the probeand a simple electronic circuit is required to decode the signals and producea continuous voltage analogue of the velocity component in one dimension.
The results of exposure chamber and field validation tests of NO2 diffusion tubes are reported. In an exposure chamber about 50 test runs at various relative humidities were performed. The field validation consisted of comparisons between tubes and a chemiluminescence monitor in 9 homes during several days in kitchen, living room, bedroom and outdoors. The results indicate a dependency on relative humidity, while the often quoted accuracy of 10% for the diffusion tubes might be too optimistic for the use of the tubes in homes.
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