Air conditioner or heat exchanger?

Cooling the electrical enclosure reduces the risk of machine downtime and premature failures, improving reliability and production continuity. When the ambient temperature is higher than the temperature that must be maintained inside the enclosure, a dedicated cooling solution is required: either an air conditioner or an air-to-water heat exchanger.

Installation

The air conditioner is a ready-to-use solution: in most cases, it only needs to be mounted and connected to the power supply. An air-to-water heat exchanger, on the other hand, requires connection to a hydraulic circuit and is therefore not immediately plug-and-play. However, it can be a very attractive option when a chilled-water circuit is already available; otherwise, if a dedicated hydraulic system must be installed, the economic advantage may be reduced or even eliminated.

System costs

When multiple cabinet installations require several cooling units, even if chilled water is not yet available, installing a chiller combined with air/water heat exchangers can be more efficient than installing numerous air conditioners. The resulting energy and operating cost savings may allow the initial investment to be recovered during operation, often within a relatively short period of time.

2. Cooling capacity and temperature control

The air conditioner generally provides the best temperature control, which is particularly useful when the goal is to maintain the enclosure within a stable temperature range. With an air-to-water heat exchanger, on the other hand, performance depends on the temperature and flow rate of the available water supply; therefore, control is less “independent” than with an air conditioner. However, for the same footprint, an air-to-water heat exchanger can offer an advantage in terms of cooling capacity.

3. Cooling capacity and temperature control

Air conditioners are well suited for operation in hot or dusty environments, but may face challenges when corrosive agents are present in the air. They also require periodic maintenance (particularly on the external side) to ensure consistent performance over time.

The air-to-water heat exchanger, since it does not have a condensing side exposed to the surrounding environment, is also suitable for applications where the air contains corrosive agents or oil mist. In addition, it does not release heat into the surrounding environment and requires significantly less maintenance than an air conditioner.

4. Electricity consumption

For the same cooling capacity delivered, an air-to-water heat exchanger has lower electrical power consumption, since only the fan requires electricity. In an air conditioner, power is consumed by two fans and, above all, by the compressor.

5. In summary

Air conditioners

HEAT EXCHANGERS

Ready to use
(electrical connection)

Hydraulic circuit required
(chilled water)

More stable and independent temperature control

Performance related to water temperature and flow rate

More sensitive to corrosive/oily air on the outside

Suitable for corrosive or oily environments

Periodic maintenance

Minimal maintenance

Higher electricity consumption
(compressor + fans)

Lower electricity consumption
Fan