vH2O2 Vapor Concentration & Condensation Point

该博客是四部分系列中的第四个博客，我们描述了过程参数如何影响蒸发的过氧化氢生物污染应用。

第一个博客：Humidity, condensation point, and maximum achievable vH₂o₂

Second blog:H₂o₂Solution Concentration Ratio, Condensation Point & Maximum Achievable vH₂o₂

第三博客：温度，冷凝点和最大可实现的VH₂o₂PPM在生物污染中

In this series, we propose four basic process parameter rules. This blog focuses on the 4th rule:

增加h₂o₂蒸气浓度降低了空气可以容纳的水蒸气量，因此，凝结会更早。

在图7中（来自我们的白皮书), we can see that increasing the H₂o₂蒸气浓度降低了空气可以容纳的水蒸气量，并更早发生凝结。

图片

Each point in Figure 7 is a condensation point, meaning thatRelative Saturationis 100 %. Temperature is on the x axis and ppm vH₂o₂在y轴上。图中的曲线显示在给定温度和PPM VH浓度下的最大相对湿度₂o₂。

如图所示，在20°C和300 ppm的过氧化氢下，相对湿度将为60％，相对饱和度为100％。如果我们增加VH₂o₂to 600 ppm at 20 °C, relative humidity is then 39 % and relative saturation is 100 %.

通过将空气温度提高到40°C，VH₂o₂浓度在300 ppm时，相对湿度将为87％，相对饱和度为100％。温度越高，空气可以容纳的水蒸气越多；相对湿度增加。

To summarize our proposed rules for controlling condensation in vaporized hydrogen peroxide bio-decontamination applications:

• Lowering the initial level of humidity increases the amount of H₂o₂凝结之前可以使用的蒸气。
• Increasing the temperature increases the amount of water and hydrogen peroxide vapor the air can hold, thereby increasing the maximum achievable ppm vH₂o₂。
• 较高的浓度h₂o₂solution increases the H₂o₂凝结之前可以使用的蒸气。
• 增加h₂o₂蒸气浓度降低了空气可以容纳的水蒸气量，因此，凝结发生更快

Conclusion

over this series of blogs (based on our白皮书), we have demonstrated how an in-depth understanding of the relation between critical process parameters allows for the development of effective, repeatable vH₂o₂生物污染周期。

Single-parameter measurement is often insufficient for monitoring and ineffective for process control. We have also shown why relative saturation is an important value in accurately predicting condensation. This is why Vaisala’s uniquePeroxcap®技术measures multiple parameters in a single sensing unit, including: hydrogen peroxide vapor ppm, temperature, dew point, vapor pressure, and humidity as both relative humidity and relative saturation.

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