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Quotes - Engineering - SalesHEAT EXCHANGERS
Accu-Therm Plate & Frame Heat Exchangers
An Accu-Therm plate pack hangs on upper and lower guide rails between a fixed and a movable end frame, held together by compression bolts. Every plate is embossed with a corrugation pattern that forces turbulence at low fluid velocity, which is where the high heat transfer coefficient comes from. Because the plates are gasketed rather than welded, the whole pack opens for inspection and can be added to when the duty grows.
- True counterflow. Approach temperatures of 2 to 3°F are achievable, which is closer than a conventional exchanger will get you.
- Compact footprint. One fifth to one half the floor space of equivalent-duty equipment, and it is serviced in the same space it occupies.
- Expandable. Add plates within the existing frame as the duty grows, instead of buying a second exchanger.
- 100% inspectable. Remove the compression bolts, slide the movable frame back, and every square inch of heat transfer surface is in front of you.
- No cross contamination. Each medium is individually gasketed and the space between gaskets vents to atmosphere, so a gasket failure leaks outside rather than between streams.
- Drop-in frames. Custom frames can be built to land on an existing foundation and pipe run from another manufacturer, with no concrete or piping changes.
Accu-Therm Plate & Frame Heat Exchangers
Where the Efficiency Comes From
The corrugation pattern on an Accu-Therm plate does two things at once. It creates a very narrow channel, and it forces the fluid to change direction constantly as it travels. Turbulence at low velocity is the result, and turbulence is what breaks down the boundary layer that limits heat transfer against a smooth wall.
The practical consequence is a heat transfer coefficient several times higher than a conventional exchanger of the same duty, which is why the unit is so much smaller. It also means the plate exchanger reaches a much closer temperature approach, and on heat recovery duty that closeness is exactly what determines how much energy you actually recover.
Plates, Gaskets and What Limits Them
Plates are available in 304 and 316 stainless as standard, with titanium, Hastelloy and Incoloy for aggressive chemistry. Seven corrugation styles let the pack be tuned between high thermal efficiency and low pressure drop, and a single unit can mix patterns to balance the two.
Gaskets are the limit rather than the plates. Nitrile, EPDM, silicone, Viton/FKM and butyl each have their own temperature and chemical window, and picking the wrong compound is the most common reason a plate exchanger leaks after service. Typical maximum operating pressures run from 75 to 300 psig depending on plate and frame selection, with higher-pressure designs available.
When Plate and Frame Is Not the Answer
We would rather say this at quotation than have you find out later. Plate and frame struggles with very high pressure, with steam duty at large pressure drops, and with streams carrying large particulates unless you move to the Free-Flow plate. Gasket life is finite and it is a maintenance item.
Where those constraints bite, the honest recommendation may be a semi-welded pack, a brazed plate unit, or a Temp-Plate solution instead. All of them are Mueller products and we will point you at whichever fits.
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Approach temperatures of 2 to 3°F are achievable because the flow is true counterflow and the plate coefficient is very high. That is far closer than a conventional exchanger will manage, and on regeneration and heat recovery duty it is the whole reason plate exchangers are specified.
Yes, provided the frame was sized with room. Plates are added within the existing frame and the compression bolts are retightened to the new pack dimension. If you expect the duty to grow, tell us at quotation and we will specify a frame with expansion space built in.
304 and 316 stainless cover the great majority of duty. Titanium is the standard answer for chlorides, seawater and hypochlorite. Hastelloy and Incoloy handle aggressive acids and high temperature. The plate material and the gasket compound are chosen together against the actual stream chemistry.
Typical maximum operating pressures run from 75 to 300 psig depending on the plate and frame selection, and higher-pressure arrangements are available. Send us the design pressure with the duty and we will confirm what frame it needs.
Clean-in-place for most sanitary and utility duty, or by opening the frame and cleaning the plates individually where the fouling justifies it. That second option is a genuine advantage over any welded or brazed design, because every surface is reachable.
Frequently, yes. Custom frames can be built to drop into an existing foundation and pipe run, which avoids concrete work and piping modifications. Send us the nameplate, the duty and the existing footprint and we will tell you whether a drop-in is realistic.
