development of a multiple tracer decay method for measuringair-flows in houses
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development of a multiple tracer decay method for measuringair-flows in houses by S. J. I"Anson

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Published by UMIST in Manchester .
Written in English

Book details:

Edition Notes

StatementSupervised by: Howarth, A.T..
ContributionsHowarth, A. T., Supervisor., Building Engineering.
ID Numbers
Open LibraryOL21846515M

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The tracer gas method is the reference technique but its implementation is difficult and the interpretation of results is not straightforward. In the present work, the concentration decay method by multiple CO 2 transmitters is experimentally validated in the case of by:   Although mea- surements can be made more quickly and accurately using a multiple tracer-gas method, the cost of the tracer gases and equipment is high. The purpose of this work is to demonstrate the use of highly portable units fitted with electron capture detectors for measurement of air flow between floors of by: decay method. In concentration decay method, tracer gas is injected into a space until a desired concentration is reached. Injection is then stopped, and the concentration decay of the tracer gas in the space is continuously measured. The measured concentration decay curve can be used to calculate the ventilation rate [6].File Size: KB.   Generally, from a tracer gas concentration curve, there are two methods to calculate the ventilation rate: two-points decay method and multi-points decay method. Two-points decay method uses an initial point (C 0) and a final point (C f) of the decay .

  The purpose of the mixing unit (MU) in a passenger aircraft is to intermingle pre-conditioned air from outside the aircraft with recirculating air from inside the aircraft. In this paper, a detailed description of measurements of the mixing performance of an MU-prototype using a tracer gas is given. The tracer gas utilized for these investigations is carbon dioxide which is injected at some. International Journal of Engineering Research and Development e-ISSN: X, p-ISSN: X Volume 4, Issue 6 (October ), PP. 69 Tracer Decay Method for Determining Ventilation Characteristics of Naturally Ventilated Office Ronak Daghih1, N. M. Adam2, Barkwi Sahari2, Basharia Yousef3*, Mohd Ali2 1.   A method to accomplish this objective using a single tracer gas was developed and experimentally verified under laboratory conditions. The method proved to be feasible and able of predicting airflows to within 10%. The advantages and disadvantages of this method, compared with multiple tracer-gas procedures to solve the same problems, are examined. The environmental tracer techniques and the hydraulic analyses each contribute to the understanding and quantification of the flow of shallow groundwater. However, when combined, the two methods provide feedback that improves the quantification of the flow system and provides insight into the processes that are the most uncertain.

decay method at the manufacture. The silicon wafers were first oxidized in a fiPirhanafl solution which consisted of (v/v) concentrated H 2 SO 4 (aq):H 2 O 2 (30%) heated to approximately ∞C for one hour Caution: The acidic “Pirhana” solution is extremely dangerous, particularly in contact with organic materials and should be. The tracer gas method was implemented by the decay technique. As the offices are small (about 12 m 2 on average), there was only a single tracer injection point related to a fan located in its geometric center. The fan air flow was directed to the walls so that the air flow through the . The concentration decay method is applied and the decrease of tracer gas concentration in the room is measured by 9 CO2 sensors in various positions. Air change rates are given for different wind. Abstract. Here, four different tracer methods were used to estimate groundwater flow velocity at a multiple-well site in the saturated alluvium south of Yucca Mountain, Nevada: (1) two single-well tracer tests with different rest or “shut-in” periods, (2) a cross-hole tracer test with an extended flow interruption, (3) a comparison of two tracer decay curves in an injection borehole with.