MEASUREMENT OF VENTILATION RATE BY CONCENTRATION-DECAY METHOD WITH LAW-ENVIRONMENTAL-LOADING TRACER GAS

摘要

Tracer gases and its monitoring method were studied in measurement of ventilation rate by use of concentration-decay method. Five kinds of gases of sulfur hexafluoride, nitrous oxide, carbon monoxide, carbon dioxide and isobutene were compared from viewpoints of global warming potential, toxicity, performance and cost of the gas and the monitor. The system of isobutene and a photo ionization monitor for the measurement was proposed and the procedure of the system and performance conditions in field was studied.