Using the NOA-7100 to Measure the Ventilation Rate —Model Experiment with N2 as Indicator—

User Benefits

- Offers both the portability and simplicity essential for workplace measurements. - All-in-one model includes built-in functionality for sampling, such as pumping and filtering. - Acquired data can be stored on a USB flash drive for easy editing on a computer or sharing with other departments.

Introduction

CO₂ is commonly used as a tracer gas for evaluating the ventilation rate of air in indoor spaces and vehicle interiors, but N2 is often used to evaluate the ventilation rate or airtightness of enclosures, such as for art exhibits. N2 gas offers various advantages, such as lower adsorption to interior materials (more inert), less fluctuation of its concentration in air, and lower environmental impact than CO₂. The following describes using N₂ as a tracer gas in a model experiment for measuring the ventilation rate based on that evaluation method. The evaluation method assumes air consists of only N₂ and O₂ to indirectly determine changes in N₂ and O₂ concentration levels. First, the evaluation space is filled with N₂ gas. When ventilation is started, external air flowing into the space decreases the N₂ concentration and increases the O₂concentration. The ventilation rate can be determined by measuring the change in O₂ concentration with an NOA-7100 analyzer.

June 29, 2021 GMT