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Application of plate heat exchanger in high efficiency boiler system

Application of plate heat exchanger in high efficiency boiler system

  • Categories:Industry News
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  • Time of issue:2020-12-23
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(Summary description)there are circumstances in which it is hydraulically advantageous to separate the primary boiler circuit from the secondary circuits of heating systems, and this can be achieved by replacing the hydra

Application of plate heat exchanger in high efficiency boiler system

(Summary description)there are circumstances in which it is hydraulically advantageous to separate the primary boiler circuit from the secondary circuits of heating systems, and this can be achieved by replacing the hydra

  • Categories:Industry News
  • Author:
  • Origin:
  • Time of issue:2020-12-23
  • Views:0
Information
The traditional method of distributing heated water from the boiler to the heating circuits of a building uses a low loss manifold to connect the primary boiler circuit to the secondary distribution. However, there are circumstances in which it is hydraulically advantageous to separate the primary boiler circuit from the secondary circuits of heating systems, and this can be achieved by replacing the hydraulic header with a plate heat exchanger.
Gasketed plate heat exchangers – are made of multiple, embossed stainless steel plates bolted together, with interleaving sealing gaskets, positioned between two end frames (as shown in Figure 1). The frames and mounting assembly are designed so they can be taken apart, and rebuilt, for cleaning and inspection. Gaskets between the plates separate the two flows and create the external seal. Gasket failure does not cause the two flows to mix – the gasket is arranged so that such leaks will go to atmosphere. Twin-walled plates are available for applications where it is critical that the two flows should not mix – as might be appropriate for domestic hot water usage. The plates are normally stainless steel and, in the brazed version, would be jointed with copper. The more robust – and lower cost – brazed heat exchangers are sealed components, so they cannot be deconstructed for maintenance.
Hot fluid flows on one side of each plate, and cooler fluid counterflows on the other side. Ports at each corner of the end plates act as headers for the fluid. One fluid travels in the alternate gaps (or channels) to the other, and the specific direction of the flow will be dependent on the individual manufacturer's design. The channels in the PHE are formed so that, even at low values of simple Reynolds number, there is turbulent flow, so – in conjunction with the thin, high-conductivity stainless steel plates – they have very good heat-transfer characteristics. Compared with a shell-and-tube heat exchanger, the heat transfer is equivalent to four or five times greater per unit area.
When choosing plate heat exchanger, it is important to seek advice from the manufacturer, not only in determining the basic size parameters, but also in giving due consideration to "fouling" - the build-up of deposited material on the panels, which affects both the design of the Plate waves as well as affect the type of fluid. If a PHE is properly selected, there is likely to be very little pollution of the heating water heat exchangers due to the turbulent flow required for proper operation. If you mistakenly overestimate the likely pollution (and the resulting decrease in U-value), the PHE will be oversized and the resulting water velocity could be lower than ideal - ironically leading to an increase in pollution levels. In some construction applications, such as using water from cooling towers, potential pollution can be more difficult and include crystallization, sedimentation and organic matter growth.
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