Heat exchangers

A plate heat exchanger is a device used to transfer heat from one fluid, gas or liquid to another without them mixing.

Plate heat exchangers – primarily used for liquid to liquid or liquid to gas heat exchange – are made up of multiple thin metal plates machined with complex grooves or channels which enable the two fluids to flow. Whilst CNC machining and stamping can be used to machine these channels, traditional metalworking has limitations, such as compromising flatness and introducing stresses and burrs. Single-point machining processes and presswork tooling can also be slow and uneconomical.

Complexity at no added cost

Photo etching removes metal simultaneously, meaning complex, bipolar flow fields can be etched to 0.025mm, and with accuracy to ±0.025mm.

Digital photo-tooling, which is low-cost and quick to produce, means set-up costs are minimal. Designers can vary the size and shape of plate channels and incorporate headers, collectors and port features without additional cost or excessive lead times.

Burr- and stress-free

Photo etching imparts no mechanical or thermal stress, unlike CNC machining, stamping and laser machining, which can compromise planarity (flatness) and subsequent stack bonding.

Materials

Etched predominantly in 300 series stainless steels, photo etched plate heat exchangers can be specified in lighter-weight, corrosion resistant metals such as aerospace grade aluminium or titanium for extreme environment applications including aircraft engines and photolithography systems.

Brazing and diffusion bonding

Precision Micro offers a number of added value plate heat exchanger technologies. Combining photo etching and diffusion bonding ensures complex cooling channels can be incorporated into heat exchangers at a fraction of the price of laser drilling.

Did you know?

Photo etching is the principle technology used in printed circuit heat exchanger systems (PHCEs). PCHEs are used in LNG carrier reliquefaction systems and are up to 85% smaller and lighter than traditional shell and tube technology.