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A rotary heat exchanger is a rotating wheel made of thin, corrugated aluminum sheet rolled into a hollow cylinder. The corrugations in the sheet create many small channels through the wheel, allowing air to flow through.
A rotary heat exchanger always transfers a small amount of humidity from the exhaust air to the supply air. This can be very beneficial for indoor climates in places like offices and classrooms, where the air tends to become too dry during the winter. The rotary exchanger typically comes with three surface types: Condensation, Hygroscopic, and Sorption, with the sorption rotor being the most effective at moisture transfer. This can be advantageous for cooling recovery through the rotor in the summer.
Despite generally having a very high temperature efficiency, a rotary heat exchanger never experiences icing. Temperature and humidity recovery is optimized by controlling the rotation speed of the exchanger.
Has a very broad range of applications, typically used in offices, schools, shops, fitness centers, restaurants (not kitchens), and similar environments.
Typically used where high efficiency is desired without the risk of odor transfer from exhaust to supply air, such as in homes, schools, kindergartens, comfort ventilation in more industrial-like buildings, and similar settings.
The counterflow heat exchanger belongs to the plate exchanger type. It consists of aluminum plates that form small fins through which the air flows. These fins keep the two air streams completely separate from each other.
The air streams run in opposite directions in the exchanger, enhancing heat exchange through the fins. Unlike the crossflow exchanger, the counterflow exchanger has a horizontal section in the middle where the air streams flow directly opposite each other. This provides a significantly higher heat recovery compared to the traditional crossflow exchanger.
The counterflow exchanger can achieve a temperature efficiency as high as a rotary exchanger. However, it has the drawback of potential icing in the exchanger. In such cases, defrosting of the counterflow exchanger is necessary, which is controlled by automation.
The crossflow heat exchanger is a type of plate exchanger. Like the counterflow exchanger, it consists of aluminum plates that form small fins through which the air flows. The two air streams are kept completely separate from each other and flow crosswise through the exchanger.
The crossflow exchanger does not have as high an efficiency as the counterflow or rotary exchangers. However, it does still produce condensate in the exchanger, necessitating a drain from the unit. On the other hand, the crossflow exchanger can be cleaned.
The crossflow exchanger is most often used where both separated air streams and the ability to clean the exchanger are desired, such as in industrial settings, kitchens, and similar environments.
The glass tube heat exchanger is used in our GX units, which are particularly suitable for fast food restaurants and commercial kitchens.
This heat exchanger consists of numerous small glass tubes that create crosswise channels through the exchanger. The two air streams flowing through the exchanger are kept completely separate, preventing the transfer of odors or other contaminants from the exhaust to the supply air.
The glass tube heat exchanger is used exclusively in our unique patented GX units, which also feature an integrated automatic washing system that cleans the exchanger every night, removing accumulated grease and dirt.
A run-around coil heat exchanger primarily consists of two liquid-coupled coils. One coil is placed in the exhaust air stream, where it extracts heat from the air, and through the liquid, transfers the heat to the coil located in the supply air stream.
Run-around coil heat exchangers are used in situations where the two air streams must not come into contact with each other under any circumstances, such as due to contamination.
Primarily used in laboratories.
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