... buildings. The primary moisture reduction strategies employed in these studies include added thermal protection, modification of heating systems, the introduction of active air movement, and ventilation of the roof assembly. The success of these strategies is verified with empirical data. condensation...

... The performance of historical buildings with mass masonry walls and ventilated attics has proven effective over time. By nature, the masonry wall is permitted to dry to both the interior and exterior, preventing moisture accumulation within the assembly. For attic spaces, the air movement under...

... The moisture performance of building envelope systems are strongly dependent on the materials used, the workmanship, and the exposure loads from the interior and exterior environments. The authors have long recognized the need to include the effects of exterior cladding ventilation...

... dental mouthguard. Female varsity hockey players (n = 12) performed two skating tests on a TM with and without a mouthguard (WIPSS Jaw-Joint Protector). The players wore the mouthguard during hockey practices prior to collection of ventilation data on the treadmill. Also, the players completed...

... of Florida. The calculations suggest that the high thermal history in a hot climate has a strong effect in accelerating aging of asphalt, particularly during the winter months. Furthermore, the effect of attic ventilation is found to reduce the uneven distribution of total cumulative damage across the roof...

... and passenger loads was observed for travel segments with variable passenger loads, such as trains and subways, which is consistent with fixed volume ventilation. CO 2 levels were stable for the cruise portion of flight segments, but were significantly higher during preflight and post-flight periods...

... Computational fluid dynamics (CFD) analysis has been utilized by the aircraft industry to characterize the distribution of ventilation air in conventionally-configured commercial aircraft passenger cabins. The recent tendency is to increase recirculated air proportion, for operating efficiency...

... that thermal and moisture transfer do not correlate with each other: for one sample, even if the wide sleeve has a much higher thermal insulation than the narrow one, the water vapour resistance is much lower. clothing comfort thermal resistance water vapour resistance ventilation convection...

... door and flowhood fan tests to develop a complete picture of the airflow patterns in multifamily buildings due to temperature differences, wind, and mechanical ventilation. Six units in an unoccupied three-story multifamily building in Portland, Oregon were tested for a period of eight days during...

... The National Institute of Standards and Technology has conducted a study of ventilation and ventilation measurement techniques in the Bonneville Power Administration (BPA) Building in Portland, Oregon. The project involved the use of the following outdoor air ventilation measurement techniques...

... ventilation system. This modification provided the ability to simulate either a return leak or a supply leak in the HAC system. The amount of leakage induced can be varied using flow control dampers and an auxiliary fan located in the ventilation system ductwork. The house was pressurized and depressurized...

... that providing wall cavity ventilation may cause pressurization of the wall cavity and can lead to a significant increase in air leakage and heat loss without reliably providing the intended protection from moisture accumulation in the cavity. Although several of the walls experienced condensation and mold...

... A menu-driven ventilation model for a personal computer was developed that is capable of determining the distributions of time-averaged, two-dimensional, steady-state flow fields and particulate or gaseous contaminants under isothermal conditions for a given particulate/gaseous diffusion...

... the program. Program predictions for the unoccupied house showed that the lowest indoor radon levels occurred when the subslab depressurization system was used. Most of the air removed by this system came from inside the basement. Simulation results also indicated that the house was adequately ventilated...

... of the field study are described in detail. Future research needs also are discussed. moisture moisture damage moisture control wood decay vapor barrier wall ventilation energy-efficient residential George A. Tsongas ] The Northwest Wall Moisture Study: A Field Study of Moisture...

... A series of medium-scale smoke experiments were conducted at the University of California, Berkeley. Representative fuels, such as wood, asphalt roofing shingles, and liquid hydrocarbons, were burned as medium-scale fuel packages in the open, with no restriction on the ventilation. For some...

... ventilation Andrew K. Persilf and James Axley 2 Measuring Airflow Rates with Pulse Tracer Techniques REFERENCE: Persily, A. and Axley, J., "Measuring Airflow Rates with Pulse Tracer Techniques," Air Change Rate and Airtightness in Buildings, ASTM STP 1067, M. H. Sherman, Ed., American Society for Testing...

... ACH. Most of this range was attributable to variation in the effectiveness of the buildings' ventilation systems. Outdoor temperatures were between -15 and -20°C (5 and -4°F). The wind was calm for all but one barracks measurement. The maintenance facility, a large single-zone building, permitted good...

..., and other parameters gain a greater influence on the air change. One of the parameters having a great influence on the air change in tight buildings are the users. The air change rate is greatly influenced by the users not only in naturally ventilated buildings, but also in mechanically ventilated buildings...

... Tracer gas techniques have been used to study air exchange in mechanically ventilated office buildings for many years. The analysis of the concentration of carbon dioxide (CO 2 ) generated by building occupants has been suggested as an alternate means of evaluating building air exchange...