Journey of the Air Dehumidifier: From the 1902 Invention to Modern DeAir Technology

06/01/2026

Over 100 Years of Fighting Humidity

Humidity has always been a silent enemy of industrial civilization. It causes printing paper to blur, food to mold, and weapons to rust. Before the advent of modern, compact, and energy-saving DeAir dehumidifiers, how did humanity struggle with this problem?

This article will take you back in time to 1902 to discover the origins of this device and analyze the two dominant dehumidification technologies used today.

1. History of 1902: Originating from a Printing Plant
2. Classification: Condensing vs. Rotor Dehumidifiers
3. Infographic: Comparing 2 Dehumidification Technologies
4. DeAir Dehumidification Technology in Vietnam

1. History of 1902: Originating from a Printing Plant

In the sweltering summer of 1902 in Brooklyn (New York), a printing plant faced a serious problem: Excessive air humidity caused the printing paper to absorb moisture and expand, resulting in misaligned colors on printed materials.

Young engineer Willis Carrier was tasked with solving this issue. He invented the world's first air treatment system, using cooling coils to condense water vapor from the air, thereby precisely controlling humidity for the printing plant. This was the precursor to modern air conditioners and dehumidifiers. [Source: Carrier History]

Image of Willis Carrier and the first air treatment dehumidifier system in 1902 — Willis Carrier next to the first humidity treatment device - The origin of the HVAC industry.

Today, this principle is still widely applied, especially in paper and packaging manufacturing factories to ensure printing quality.

2. Classification: Condensing vs. Rotor Dehumidifiers

According to ASHRAE (American Society of Heating, Refrigerating and Air-Conditioning Engineers), there are currently two most common dehumidification technologies:

A. Condensing Dehumidifier

This is the most common type, operating on the "cold condensation" principle (similar to Carrier's invention but optimized).

Mechanism: A fan draws humid air through a cold coil -> Water vapor condenses into water upon contact with the cold surface -> Dry air passes through a hot coil to be warmed up and blown out.
Representative: DeAir.RE Series.
Application: Storage warehouses, workshops with temperature > 20°C.

Diagram of the operating principle of DeAir Heat-pump condensing dehumidifier — Condensing dehumidification principle: Simple, effective, and energy-saving.

B. Rotor Dehumidifier (Desiccant)

Heavily developed during World War II to preserve military equipment, this technology uses a desiccant (Silica Gel) to absorb water directly.

Mechanism: A honeycomb wheel (Rotor) rotates continuously, absorbing moisture and regenerating by a hot air stream.
Representative: Dezenno Series.
Application: Cold storages, Pharmaceutical cleanrooms, requiring extremely low humidity (< 35%).

Dezenno Rotor dehumidifier specialized for cleanrooms and cold storages — Dezenno Rotor Dehumidifier: The solution for deep humidity and low temperatures.

3. Infographic: Comparing 2 Dehumidification Technologies

CRITERIA	CONDENSING DEHUMIDIFIER (DeAir.RE)	ROTOR DEHUMIDIFIER (Dezenno)
Principle	Cold Condensation (Using Compressor).	Adsorption (Using Silica Gel Wheel).
Operating Temperature	Best > 20°C. (Efficiency drops below 15°C).	All temperatures (Even in deep freeze).
Achieved Humidity	40% - 60% RH.	Ultra-low < 10% - 30% RH.
Power Consumption	Low (Most economical).	Higher (Due to heating requirement).

4. DeAir Dehumidification Technology in Vietnam

Inheriting a technological legacy of over 100 years, DeAir has researched and developed dehumidifier lines that are tropicalized to suit the Vietnamese climate:

Blue Fin Coated Radiator: Resists sea salt and acid corrosion.
Heat-Pump Technology: Regenerates heat energy, saving up to 60% of electricity compared to older generations.
Smart Control System: Integrated PLC and touch screen, connecting to BMS for remote monitoring.