About the company |
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About the company |
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Production |
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Plate Heat Exchangers |
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Gasketed PHE |
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Brazed PHE |
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Modular Heat Substations |
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Boilers |
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Regulators |
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Oil Cleaning |
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R&D |
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BRAZED PLATE HEAT EXCHANGERS
The Standard Design
The Brazed Heat Exchanger is a variation of the traditional Gasketed Plate Heat Exchanger. It evolved from the convectional gasketed plate to answer the need for a compact plate heat exchanger, suitable for high pressure and high temperature duties.
The Brazed Plate heat Exchanger is, like the Gasketed Plate Heat Exchanger, constructed from a series of corrugated metal plates, but without gaskets, tightening bolts, frame etc.
The Brazed Plate Heat Exchanger simply consists of stainless steel plates and two end plates. All the plates are brazed together in a vacuum furnace to form an extremely compact and pressure / temperature resistant heat exchanger with superior heat transfer characteristics. Copper is the usual brazing material. Nickel is used in its place where the heated media contains ammonia, which would dissolve copper, or, in applications where the presence of copper ions is undesirable.
Unlike the Gasketed Plate Heat Exchanger, the Brazed one cannot be disassembled. The scrubbing action of the highly turbulent flow retards fouling. If cleaning is required, the unit can be back-flushed to prevent clogging, or chemically cleaned to eliminate the build up of scale.
Principle of operation
The working mediums taking part in the heat transfer process are introduced through the connections to the Heat Exchanger. In the unit the working mediums are distributed to the alternate channels, which are formed by plates and corner inlets. The channels are situated in such a way, that two working media can pass through them in reverse flow condition.
The advantages of the Brazed Plate Heat Exchangers
The Alfa Laval Brazed Plate Heat Exchangers have a wide application in the Heating, Air Venting and Conditioning systems, for evaporation and condensation, and they are also used as oil coolers in the hydraulic systems. The high heat exchange effectiveness of the Brazed Plate Heat Exchanger causes its compactness and it allows to save the surface area. The Brazed Plate Heat Exchanger is able to sustain high temperatures and pressures.
Technical Data:
| Brazed PHE type | ÑÂ14 | ÑÂ22 | ÑÂ26 | ÑÂ51 | ÑÂ76 |
| Min. operating temperature | -160°Ñ | -160°Ñ | -160°Ñ | -160°Ñ | -160°Ñ |
| Max. operating temperature | 225°Ñ | 225°Ñ | 225°Ñ | 225°Ñ | 225°Ñ |
| Min. operating pressure | âàêóóì | âàêóóì | âàêóóì | âàêóóì | âàêóóì |
| Max. operating pressure | 30 àòà | 30 àòà | 30 àòà | 30 àòà | 30 àòà |
| Max. flow rate*) | 3.6 ì3/÷ | 3.6 ì3/÷ | 8.1 ì3/÷ | 8.1 ì3/÷ | 39 ì3/÷ |
| Standard number of plates | 14,20 | 10, 18, 24, 34, 50, 70, 100,120 | 10, 20, 30, 40, 50, 60 | 20, 30, 40, 50, 60, 70, 80, 90, 100, 110, 120, 130, 140, 150 |
*) The water under 5 m/sec in connections
Standard sizes:
| Type | a | b | c | d | e | A | Weight, kg |
| ÑÂ14 | 172 | 42 | 208 | 78 | 24 | 8+n*2.35 | 0.7+n*0.06 |
| ÑÂ22 | 279 | 42 | 318 | 78 | 24 | 9+n*2.35 | 1.0+n*0.11 |
| ÑÂ26 Í | 250 | 50 | 310 | 112 | 45 | 9+n*2.40 | 1.2+n*0.13 |
| ÑÂ51 | 466 | 50 | 526 | 112 | 45 | 10+n*2.40 | 1.9+n*0.23 |
| ÑÂ76 Í | 519 | 92 | 618 | 191 | 48 | 10+n*2.85 | 7.0+n*0.44 |
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