Circond

Condensing stainless steel Heat Exchanger


“Circond” is a single purpose integrated and compact heat exchanger based on a simple stainless steel coil with an oval section.
The heat exchanger is composed by a combustion chamber, condensing area and an insulated metallic disk protected with silicon ceramic ber which separates the two areas.

  • Compact
  • Easy interchangeability
  • Full range for domestic application
  • Best performance and high reliability
  • Modular for di erent output

Benefits of a single coil Heat Exchanger:

  • Autocleaning
  • Minimum number of components
  • High efficiency and robustness
  • Stainless Steel
  • Avoiding welding process

Functional principles
The hot flue gas produced in the combustion chamber crosses the first coils before the metallic disk and goes outside towards the external case realizing the high temperature heat exchange; the flue gas goes beyond the baffle and passes across the last coils, realizing the low temperature heat exchange which preheats the water inlet through the exhaust condensation.
The condensate, product due the high temperature decrease of exhaust fume, drains out from the bottom part of Circond, on the opposite side the flue gas exits by the top.

The metallic disk separates the combustion chamber and the condensing part and the disk position is variable: this distinctive features guarantees an optimized condensing heat exchange for each specific power size.
This particular property affect both the fume pressure drops and quantity of produced condensate, consequently the Heat Exchanger efficiency.

Range of products
The three models differ from each other by the number of the coil windings and consequently the external dimensions. In the figure below with the same diameter the depth (A) and the Heights of water connections interaxes (B) change.
range-of-products-circond

Strong reliability: product validation
Circond succeded many di erent kind of tests and has a robust design concept:

  • CFD analysis
  • Robust design metodology
  • Best Efficiency and Combustion analysis
  • Accelerated Life test with different cycles carried out in several critical conditions
  • Large field test
  • Corrosion analysis
Model Circond Max power CHMax power DHWDepth (A)Water connections interaxes (B)
24/3024 kW30 kW182 mm164 mm
28/3528 kW35 kW222 mm203 mm
33/4032 kW40 kW247 mm229 mm
Range of products

The three models differ from each other by the number of the coil windings and consequently the external dimensions.
circond

Clicca sulle immagini per visualizzare a schermo intero.