Heat Exchangers for HVAC Information

Heat Exchangers are designed for the transfer of heat between two physically separated fluids or gases, such as water-to-water or steam-to-water. Designs include:

Converters consisting of a shell with long tubes.

Spiral units consisting of an assembly of two long strips of plate wrapped to form a pair of concentric spiral passages. Alternate edges of the passages are closed so that media flow through continuous leak proof channels. The curving channel introduces turbulence which increases efficiency and keeps solids in suspensions.

Plate and Frame units are used in the distribution of heating hot water and cooling chilled water. Plate heat exchangers consist of a pack of corrugated metal plates with portholes for the passage of fluids between which heat transfer is taking place. The number and size of the plates are determined by the flow rate, physical properties of the fluids, pressure drop and temperature.

Typical applications:

1) To heat water for washing, cooking, etc.

2) As a booster to heat water to a higher temperature.

3) To heat glycol for snow melting.

4) To protect water tanks from freezing.

5) To heat water for hydronic heating applications.

6) Waste heat recovery.

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