Keep Large Particles Out

Keep Large Particles Out

The plates in a PHE typically are in a chevron or V-shape (figure 2). Every other plate is reversed, causing a waffle-type grid between those plates. The space between the plates is called the channel and, in many cases, can be quite small to achieve higher levels of heat transfer efficiency.

Particles entering into the exchanger can potentially get caught in the plate channel, so it is important to ensure that no particulate larger than 0.0625″ is allowed to enter the heat exchanger. If your liquids could contain larger particles, they should be removed with either a strainer or separator prior to their entering the exchanger.

Keep Large Particles Out

This is especially important if there is an open tank in the system where larger particles could be introduced. Increased velocity is not only important for efficiency, but also to help keep particles in suspension so they pass through the exchanger. Most plate-and-frame heat exchangers will allow particles 0.0625″ or smaller to pass. For liquids containing larger particles than this, “wide-gap” plate designs are available

Figure 3. The total dimension of a plate pack is based on the number of plates and grids in the unit. This distance is measured between the inside of the head and follower. You should check this dimension and tighten the unit, if necessary, at least once a year.

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