Greenhouse Ventilation Rate: Theory and Measurement with Tracer Gas Techniques

Tracer Gas as an Aid in Mine Ventilation Analysis

The Bureau of Mines has s u c c e s s f u l l y used s u l f u r h e x a f l u o r i d e (SF,) a s a t r a c e r gas t o measure mine a i r f lows under c o n d i t i o n s where c o n v e n t i o n a l methods have f a i l e d . SF, was employed e x p e r i m e n t a l l y t o measure a c c u r a t e l y r e c i r c u l a t i o n o f r e t u r n i n t o i n t a k e a i r caused by leakage thro...

Tracer gas evaluations of push-pull ventilation system performance.

A push-pull ventilation system is effective for hazardous material exhaustion. Although a push-pull ventilation system has advantages over a local exhaust hood, some laborious adjustments are required. The pertinence of the adjustments is uncertain because it is difficult to evaluate the performance of a push-pull ventilation system quantitatively. In this study, a measurement of the capture ef...

A Modified Tracer-Gas-Concentration Decay Method for Ventilation Rate Measurements in Large, Long, and Narrow Spaces

Ventilation is essential to the health and comfort of occupants in enclosed spaces. However, it is difficult to accurately measure the ventilation rates in large, long, and narrow spaces such as aircraft cabins and train compartments. This study proposed a modified tracer-gas-concentration decay method that combined the multi-zone technique and genetic algorithm to determine ventilation rate in...

Tracer Dating and Ocean Ventilation

The interpretation of transient tracer observations depends on dif•cult to obtain information on the evolution in time of the tracer boundary conditions and interior distributions. Recent studies have attempted to circumvent this problem by making use of a derived quantity, age, based on the simultaneous distribution of two complementary tracers, such as tritium and its daughter, helium 3. The ...

Measurement Equals Management! Conducting a Greenhouse Gas Inventory