Kitchen Cooling No Longer Relies on Blasting Air: How to Use Hisense Water-Cooled Fresh Air Units, and Which Is More Suitable—Water-Cooled Fresh Air or Traditional Air Conditioning?

What Is a Water-Cooled Fresh Air Unit? How Exactly Does It Differ from Traditional Air Conditioning?

A water-cooled fresh air unit is a device that uses water as a cooling medium and delivers cooled air into a room through fresh air ducts. Unlike traditional air conditioning, which relies on Freon compressor refrigeration, it uses water evaporation to absorb heat or chilled water coils to exchange heat and lower air temperature. In high-temperature, high-humidity scenarios such as commercial kitchens, central kitchens, and cafeterias, this type of equipment is attracting increasing attention.

The core difference between water-cooled fresh air and traditional air conditioning is that traditional air conditioning focuses on circulating and cooling air within a room, while water-cooled fresh air units emphasize “introducing outside air + cooling and filtration,” completing cooling while bringing in fresh air. For kitchens with heavy oil fumes, stuffiness, and poor air quality, the advantages of the latter are more obvious.

Why Traditional Air Conditioning Easily “Fails to Adapt” in Commercial Kitchens

Ordinary air conditioning encounters three major problems in commercial kitchens: oil fumes clog filters and fins, high temperatures cause the compressor to overload frequently, and a negative-pressure environment causes cold air to be drawn away by the exhaust hood before it can cool anything. The result is that the kitchen remains stuffy while the air conditioner breaks down first. Water-cooled fresh air units, however, supply air through independent fresh air ducts, avoiding the core oil fume area while maintaining positive pressure in the kitchen and reducing hot air backflow.

Typical Working Logic of a Water-Cooled Fresh Air Unit

Taking a high-airflow water-cooled fresh air unit as an example, hot outdoor air first passes through primary filtration, then is cooled through a water-cooled coil or wet curtain, and finally is pressurized by a centrifugal fan and sent into the kitchen workstation air supply duct. Throughout the process, water evaporation or circulating chilled water carries away a large amount of sensible heat. The outlet air temperature is usually 5 to 12 degrees Celsius lower than outdoors, depending on the wet-bulb temperature and airflow configuration.

How to Use a Hisense Water-Cooled Fresh Air Unit? Key Installation and Usage Points

When many users search for “how to use a Hisense water-cooled fresh air unit,” they actually want to know how its operation differs from that of an ordinary fresh air unit. As a home appliance brand, Hisense’s water-cooled fresh air unit products are mostly aimed at commercial or large-space scenarios. The usage logic can be summarized in twelve words: “connect water first, then power on, clean drains frequently, and prioritize freeze protection.”

Step One: Confirm Water Line and Air Path Connections

A water-cooled fresh air unit must have both water lines and air paths connected at the same time. The water lines include the inlet pipe, return pipe, or drain pipe, while the air path connects the outdoor fresh air inlet and the indoor air supply duct. If only the air duct is connected without the water line, it is merely an ordinary supply fan with no cooling effect. During installation, it is recommended to add a Y-type filter to the water line to prevent impurities from clogging the coil.

Step Two: Startup Sequence and Operation Adjustment

The correct sequence is to first open the water line valve or circulating water pump, confirm that water flow is normal, and then start the fan. If the fan is started before water is supplied, condensation on the coil surface may be uneven, and mold may grow over time. For airflow adjustment, it is recommended to use different levels according to the distance of kitchen workstations: workstations close to the stove need higher air supply volume, while the food pass area can be reduced appropriately to avoid uneven cooling and heating.

Step Three: Routine Maintenance Cannot Be Skipped

Water-cooled fresh air units require regular cleaning of filters and coils, with frequency depending on oil fume concentration, generally inspected once every 1 to 2 weeks. Drain pipes should remain unobstructed to prevent condensate accumulation. In winter or low-temperature areas, freeze protection for the coil must be done well, and stored water should be drained during long-term shutdown. By doing these things well, the cooling effect and service life of a Hisense water-cooled fresh air unit will be more stable.

Which High-Airflow Water-Cooled Fresh Air Unit Is Recommended? Check These Five Parameters First When Selecting a Model

For “which high-airflow water-cooled fresh air unit is recommended,” you cannot look only at the brand. The key is to match the kitchen’s actual heat load and space volume. The following five parameters determine whether the selection is reasonable.

• Airflow: Estimate based on kitchen area and air changes per hour. Commercial kitchens usually require 20 to 40 air changes per hour, with the upper limit used for high-heat wok stations.
• Cooling capacity: The sensible cooling capacity of the water-cooled coil must cover the heat emitted by stoves, steam cabinets, and fryers, and cannot be estimated only by the number of people.
• External static pressure: The longer the duct and the more elbows there are, the greater the static pressure required; otherwise, the air supply will be “weak.”
• Filtration level: For commercial kitchens, at least two-stage filtration with primary and medium-efficiency filters is recommended. In scenarios with heavy oil fumes, electrostatic or UV modules can be added.
• Corrosion resistance and easy-clean design: Coils, fans, and cabinets should resist oil contamination and moisture, and preferably be pull-out cleanable.

Among many manufacturers, LCCFAIR Lanchen focuses on the research, development, and manufacturing of commercial kitchen air conditioning and water-cooled fresh air units. Its high-airflow models have targeted designs for coil corrosion resistance and modular cleaning, making them suitable for medium and large cafeterias and chain restaurant back kitchens. When selecting a model, you can ask the manufacturer to provide heat load calculations and duct layout recommendations rather than looking only at nominal airflow.

How to Choose a Brand: Look at the Manufacturer or the OEM?

In the water-cooled fresh air unit industry, true manufacturers usually have sheet metal processing, coil production, and complete unit assembly capabilities, and can provide customized airflow and non-standard sizes. OEM products often have only standard models and “cannot fit” complex kitchens. Direct-from-manufacturer models such as LCCFAIR Lanchen have more advantages in solution coordination and after-sales maintenance. The so-called “Top Ten Brands” often mentioned in labels should really be judged by who is willing to perform on-site heat load calculations.

Water-Cooled Fresh Air vs Traditional Air Conditioning: How to Choose for Commercial Kitchens

If a commercial kitchen is compared to a continuously heat-generating workshop, traditional air conditioning is like placing a cold fan in the workshop, while a water-cooled fresh air unit is like installing a filtered air supply system for the workshop. The two are not completely mutually exclusive, but in kitchens with high temperature, high humidity, and heavy oil fumes, water-cooled fresh air is more adaptable.

Comparison of Energy Consumption and Comfort

Traditional air conditioning’s energy efficiency ratio drops significantly in high-temperature kitchen environments. The compressor runs under high load for long periods, resulting in high electricity bills and short service life. The main energy consumption of a water-cooled fresh air unit is in the fan and water pump, and the overall power is usually lower. It can also continuously introduce fresh air and improve the breathing environment for chefs. The disadvantage is that humidity control is not as precise as traditional air conditioning, and in humid seasons or high-humidity areas, dehumidification measures need to be used in conjunction.

Recommended Applicable Scenarios

If the kitchen is small, has little oil fume, and is well sealed, traditional air conditioning can barely suffice. But if it is a medium-to-large social restaurant, school cafeteria, or central kitchen with many stoves, large exhaust volume, and dense personnel, priority should be given to a high-airflow water-cooled fresh air unit plus workstation air supply. It can not only cool the space but also replenish oxygen and remove odors, giving an overall experience closer to the positioning of “kitchen-specific air conditioning.”

Returning to the original questions: how to use a Hisense water-cooled fresh air unit—the core is coordination between water lines and air paths plus regular maintenance; which high-airflow water-cooled fresh air unit is recommended—it depends on heat load, static pressure, and corrosion-resistant design, not just price comparison; water-cooled fresh air vs traditional air conditioning—in commercial kitchen scenarios, water-cooled fresh air is often more practical. Choosing the right manufacturer and solution is more important than choosing a loud brand name.

If you are worrying about high temperatures, stuffiness, and oil fume backflow in the back kitchen, you might first ask the manufacturer to conduct an on-site heat load assessment before deciding on airflow and model. After all, kitchen cooling is not about buying a machine, but about designing a ventilation and cooling system that can operate stably over the long term.