What is a dry room?

A dry room is a specialist production area with industrial dehumidification to maintain the air at low dewpoints (dp) for moisture-sensitive manufacturing processes or research. A dry room dew point is generally minus 30.0°Cdp and below, or less than 1% relative humidity (RH). The ultra-dry air creates an ideal environment for operations such as battery production.

An ultra-low humidity (dewpoint) room gives a consistent environment to investigate issues and produce a stable baseline for sensitive materials and processes. Within R&D applications, a dry room can help to determine whether it is the synthesis of the materials or the deposition processes that causes defects. 

Benefits of controlled humidity levels:

  • Lowers the risk of electronic failures through moisture damage
  • Protects materials from corrosion or damage caused by sensitivity to low relative humidity
  • Prevents the degradation of hygroscopic materials
  • Reduces bacterial growth

Cleanroom Control System

What is dew point?

Dew point (dp) is the temperature that a volume of air reaches when it becomes saturated with water vapour, causing dew to form. It is used as a standard parameter to determine humidity control in an environment like a dry room.

Dry room specifications

Let's look at the dew point in a typical environment to demonstrate how ultra-dry the air is in a dry room. Comfort cooling is usually 20-22°C and 50% RH, which translates to approximately 9.3°Cdp.

Now let's look at the requirements for battery production, which is a typical use of a dry room. Because of the sensitivity of their materials, solid-state battery dry rooms may need humidity controlling to minus 30/35.0°Cdp at the point of return. In comparison, a dry room for lithium battery needa a greater humidity control of around minus 50.0°Cdp at the point of return.

These examples illustrate a vast difference between the requirements of a typical environment and an application that needs a dry room. A combination of an HVAC design, an airtight envelope system, and process controls produce the conditions for a dry room.

Speak to dry room manufacturers Connect 2 Cleanrooms about battery dry rooms

Connect 2 Cleanrooms partners with DRYAIR to deliver ultra-low dewpoint HVAC design for clients. Speak to us today about your dry room project.


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