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Title: A Comparison Of Emission Rates Of Unvented Gas Appliances Measured By Two Different Methods
Author: D. J. Moschandreas, B. m. Relwani
Source: American Gas Association 1984
Year Published: 1984
Abstract: Several studies of the indoor environments have concluded that in residences with unvented gas appliances (mainly ranges) concentrations of CO and NOj are higher indoors than corresponding outdoor concentrations. A few studies have dealt with the measurement of emission rates of these applicances. Historically, the early studies used a direct coUeciion method and have followed experimental procedures established by the American National Standards Institute (ANSI). Later studies derived emission rates indirectly by measuring gas concentrations and mass balance models. The principal experimental difference between the two methods relates to the direction of the effluents: in the direct measurement methods, the effluents are directed to the sampling probe in the mass balance method, the effluents are accumulated within the chamber, and the chamber air is sampled. Total mixing conditions are maintained within the chamber. Comparison between these two methods showed some differences. However, comparison is best performed with identical appliances under controlled conditions, this has noi been the case.

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