The BR-75 plate-and-frame heat exchanger uses a frame-clamped plate pack structure, with herringbone corrugation patterns on the plates and an effective heat transfer area of 0.75 m² per plate. The design pressure is 1.6 MPa, the design temperature ranges from -20°C to 200°C (depending on gasket material), the connection size is DN80, and the maximum processing flow rate is approximately 120 m³/h. Compared with shell-and-tube heat exchangers, it can reduce floor space by about 40% at the same heat transfer duty, and the heat transfer area can be adjusted by adding or removing plates without replacing the entire unit. Compared with brazed heat exchangers, this model can be opened for cleaning, making it suitable for media containing particles or prone to fouling.
Plates are commonly made of 304 or 316L stainless steel. 304 is suitable for general clean water and low-concentration organic media; 316L has better resistance to chloride pitting corrosion than 304 and is suitable for saline or mildly corrosive conditions. Gasket selection directly determines the temperature and media boundaries: nitrile rubber is suitable for media such as water and mineral oil, with a normal operating temperature of -20°C to 100°C; beyond this range, EPDM rubber should be selected, as it has good resistance to hot water and steam, with an upper temperature limit of about 150°C; if the medium contains acids, alkalis, or organic solvents, fluoroelastomer must be matched, covering -20°C to 200°C. During design and selection, the chemical composition of the medium, maximum operating temperature, and start-stop frequency should be used as input conditions, and material certificates and applicable condition tables should be requested from the supplier.
In HVAC water systems or hydraulic oil cooling circuits, if flow fluctuates greatly and frequent disassembly for cleaning is required, the openable structure of this model is superior to brazed types; if the medium is high-temperature steam and space is limited, shell-and-tube types are more stable in terms of pressure containment and temperature resistance. Plate-and-frame units are highly dependent on gaskets, and the gasket replacement cycle is affected by temperature, medium, and start-stop frequency, typically 12 to 24 months. In actual selection, it is recommended to allow a 10% to 15% heat transfer area margin according to the most unfavorable operating conditions, and to verify whether the pressure drop is within the allowable range of the pump head.
