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Heat Exchanger Principles

Plate heat exchangers

The principles of plate heat exchangers are simple; Two neighboring plates create channels for the air to pass through. The supply air passes on one side of the plate and the exhaust air on the other side. The heat in the exhaust air is transferred thought the plate from the warmer air to the colder air. The exhaust air is contaminated with humidity and pollutants, but the two airflows never mix, leaving the supply air fresh and clean.

The Heatex production concept, the double sealing concept with gluing and a mechanically fold, ensures airtight heat exchangers having low cross contamination and therefore supplying high indoor air quality. The design allows rapid and thorough cleaning and servicing. The strong aluminum plates in high standard alloy give the products a long lifetime and with no moving parts, the maintenance and service costs can be kept to a minimum. The plate exchangers are available in various material and configurations. We also have epoxy coated plates with painted frames for harsh and high corrosive areas.

We have two kinds of plate heat exchangers, crossflow and counter flow. In a cross flow exchanger the cold and the warm air flow perpendicular to each other. In counter flow exchangers the two airstreams flow in opposite direction to one another. The longer the airstreams flow next to each other the better efficiency, which generally makes counter flow more temperature efficient than cross flow exchangers. However, the cross flow exchangers can be placed in two-step configurations which give results equivalent to those of the counter flows.

Rotary heat exchangers

The rotating heat exchanger consist of a rotating wheel, casing and drive unit. As the wheel rotates slowly, the heat from the exhaust air is picked up by the aluminum in the matrix and transferred to the cool supply air. Rotary heat exchangers are often the preferred choice thanks to the low freezing risk as the wheels by definition defrost themselves, their small footprint and the high sensible efficiency that they provide. The possibility of adding coating to the wheel, which allows latent transfer, is another factor favoring these products.

Heatex offers a broad range of rotary heat exchangers covering the complete application span from small residential installations up to very large commercial and industrial installations. All models are made to measure to fit the specific air handling unit and there is a wide variety of well-heights to suit various performance requirements. Heatex rotary heat exchangers can be equipped with a purge sector in order to minimize the cross contamination of fresh air with exhaust air.



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