Plate Heat Exchangers
STEM technology offers maximum efficiency in compact space, with outstanding application flexibility.
STEM Innovative plate design provide more heat transfer using lesser space, hence higher efficiency. STEM PHE operating in one-third to one-fifth of the surface area against conventional shell and tube heat exchangers designed for the same application.
STEM models have higher surface area to volume ratios than conventional shell and tube heat exchangers. STEM offers superior heat transfer coefficients compared to shell and tube heat exchangers. STEM offers “true” countercurrent flow, which maximizes the mean temperature difference between the fluids.
Expansive product line meets a variety of needs.
The STEM line has the capability to meet any size application, and it offers a wide variety of plate construction materials and connection types. You can choose products constructed from 304 or 316 stainless steel, titanium, Hastelloy,® Incolloy® or other metals. Plates can be gasketed, semi-welded, double wall, or free flow, depending on your applications.
Advanced system offers superior efficiency
STEM uses a combination of chevron heat transfer plates sequenced between a frame plate and pressure plate. The heat transfer plates have holes at the four corners that form a header, which distributes the respective fluids to the opposite sides of each plate when the plates align.
The fluids are confined to the heat transfer surface of the plate or the port, as appropriate, with elastomer gaskets. Counter current flow is obtained with a given fluid traveling up one side of a plate and the other fluid down the opposite side of the plate.
The plate’s chevron patterns create metal-to-metal contact points between adjacent plates for added strength. This allows differential pressures equal to the design pressure.
The entire assembly is held together with tightening bolts. Carry/guide bars are used to obtain the proper alignment.
Adaptable construction offers superior versatility.
Double gasket prevents cross-contamination.
STEM models include a one-piece molded gasket. This standard gasket is designed with two rings to confine each fluid to the appropriate port region of the plate, a field region of the gasket to confine the fluid to the heat transfer area of the plate and a vented region in between. This design creates a double gasket with a leak path to atmosphere through the vented region to prevent any cross-contamination of the fluids due to a gasket failure.
A leak due to a gasket failure is detected as a leak to atmosphere prior to any chance for cross-contamination. Bell & Gossett offers a variety of glueless and glued gaskets.
Advanced STEM HVAC Solutions
STEM gasket plate heat exchanger is designed to meet the industry’s needs. Web-based computerized thermal design software provides solutions with the highest rates of heat transfer. These solutions result in smaller units with lower pressure drops. STEM provides one of the greatest selection of models for gasketed plate heat exchangers to meet all you HVAC needs.
Typical list of HVAC Applications: - Waterside Economizers - District Cooling and Heating - Thermal Storage - Pressure Interceptor - Heat Pump
Modular design allows for easy installation and maintenance.
STEM design made assembly, inspection and cleaning easy.
Technical Data
| Performance: Maximum Flowrate (GPM) | 18,000 GPM |
| Max. Heat Transfer Area (Sq.Ft.) | Up to 20,000 Sq. Ft. |
| Connections: NPT Nozzles – Size (Inches) | 1 Inch to 2.5 Inch |
| Connections: ANSI Studded Size (Inches) | 3 Inch to 18 Inch |
| Frame Materials | Primed and Epoxy Coated Carbon Steel |
| Plate Materials | Stainless Steel, Titanium, Hastelloy TM, Other Higher Alloys |
| Gasket Materials | Nitrile, EPDM, VitonTM |
| Frame Design Pressure | 150 psi and 300 psi Standard. Up to 450 psi by request |
| Design Temperatures | -31F to 338F |
| Bolting Materials | Zinc Plated Carbon Steel |
| Plate Pack Shroud | Aluminum with option for Stainless Steel |