Plate heat exchangers are used wherever thermal energy (heat) has to be transferred from one fluid to another.
The advantage is that they can maintain the fluid temperature at a very low and stable level – depending on the temperature of the coolant.
Plate heat exchangers consist of a stack of stamped heat exchange plates which are either brazed together or bolted together in a frame with gaskets. Medium flows in the channels between the plates where hot medium (which will be cooled) alternates with cold medium (which will be heated). The design of the plates induces the turbulent flow required for efficient heat transfer.
Brazed Plate Heat Exchangers - HYDAC HEX Sxxx
The design and construction of the brazed plate heat exchangers are particularly compact and efficient. The heat transfer plates are made in stainless steel and are brazed with copper as standard. For use with aggressive media, nickel braze can also be used.
Copper brazed plate heat exchangers are pressure resistant up to 30 bar, nickel brazed up to 10 bar. Special models are however also suitable for higher pressures.
Operating Data
- Plate material: Stainless steel 1.4401 (AISI 316)
- Braze material: Copper (standard), nickel
- Pressures: Copper braze max 30 bar (test pressure 45 bar), Nickel braze max 10 bar. Other pressures on request
- Media:
- Hydraulic oil, lubrication oil, rolling oil, engine oil
- HFC, HFA, HFD, pressure fluids
- Water, water glycol
- Refrigerant
- Temperature range: up to +200 °C
- Connections: Female thread (standard). Optional: male thread, soldered connection, SAE connection
Gasketed Plate Heat Exchangers - HYDAC Hxxx-LIQUID
Gasketed plate heat exchangers are particularly suitable for large flows and high cooling capacities. The stack of heat transfer plates and gaskets is clamped together with bolts in a frame.
This means that the plate heat exchanger can also be dismantled for cleaning and maintenance. Furthermore it is possible to add more plates at a later date to achieve a higher capacity.
For applications with seawater, the plate heat exchangers can also be supplied with titanium heat transfer plates.
Various stamp designs can cater for heavily contaminated or high viscosity fluids to suit particular applications, or even if the temperature difference between the hot and cold medium is only minimal.
Operating Data
- Plate material: Stainless steel 1.4401 (AISI 316), 1.4306 (AISI 304), SMO, Titanium
- Plate thickness: 0.4 - 0.6 mm
- Seals: NBR (HT), EPDM, Viton
- Connections: Threaded pipe, male, Flange (up to DN300)
- Media:
- Hydraulic oil, lubrication oil, rolling oil, engine oil
- HFC, HFA, HFD, operating fluids water, water-glycol, seawater (with titanium plates)
- Limited possibility: steam applications
- Operating temperature: up to 140 °C
- Pressure ranges: 10 bar, 16 bar, 25 bar
- Flow rate: up to 2,000 m3/h
- Cooling capacity: up to 30,000 kW (dependent on the inlet temperature of the media and the flow rate)
With brazed plate heat exchangers it is possible to reverse the inlet and outlet connections of a medium without adversely affecting the function. However, to guarantee the counterflow principle, the inlet and outlet of the other medium must also be changed. However, changing the cold and hot side is not recommended. The plate heat exchangers are designed to have hot fluid always flowing through the outer plate. If cold medium flows through, condensation could form on the outside of the heat exchanger.
With gasketed plate heat exchangers it is not possible to change the connections because of the more complex plate stamp pattern. In this case the connections can be selected before manufacture of the plate heat exchanger.
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