FR2783903A1 - Electric water heater with controlled and natural circulation for more efficient and more uniform water heating - Google Patents

Abstract

The water heater has a central vertical cylinder (7) with the electric heating element (8) at its base. The top of the cylinder is part-closed by a plate (3) which reduces the section available for hot water to leave, increasing water velocity and circulation in the water tank (1). A deflector plate (2) above the top of the cylinder diverts emerging water downward, increasing circulation.

Description

The present invention relates to a device for concentrating production

  heat, direct the circulation flow of the heat transfer fluid and thus improve the thermal efficiency of an electric water heater or boiler to reduce the operating cost.

  The traditional operation of these devices without this dis-

  positive does not ensure a balanced natural circulation over 360 o for the benefit of preferential circuits this

which may affect performance.

  The device according to the invention overcomes this

  major drawback. It comprises, in fact, according to a first

  characteristic era a central, vertical chimney covering almost the entire height available in the height,

  of the tank, at the base of which are housed one or more

  several electrical resistances. This arrangement allows

  concentrate in a delimited space the totality of the

  this heat released to rapidly raise the temperature of the heat transfer fluid and cause natural circulation

  and evenly distributed over 360 o.

  According to particular embodiments: - The central vertical chimney can be constituted by

  a simple vertical ferrule at the top of which, in its

  upper tie, can be placed ONE or TWO coils (FIG. 1 and FIG. 2) used to heat two circuits

separate secondary.

  - The central chimney can be constituted by a heater-

  simple, annular flower (FIG. 3 and FIG. 4) at the top of which inside or outside, a coil can be provided

  to form two sacondai circuits with the heater

separate res. - 2 -

  The central chimney can be constituted by a double annular heater (FIG. 5 and FIG. 6) to distinguish two

separate secondary circuits.

  The accompanying drawings illustrate the invention: FIGS. 1 and FIG. 2 show in section the device of the invention with a vertical central chimney made

  with a vertical cylindrical shell and coils.

  FIGS. 3 and FIG. 4 show in section the device of the invention with a vertical central chimney made

  with a simple, serpentine cylindrical heater.

  FIGS. 5 and FIG. 6 show in section the device of the invention with a vertical central chimney produced

  with a double cylindrical heater.

  These FIG. 1 to FIG. 6 also represent a closed disc

  (3) placed at the top and inside the chimneys

  central openings in order to reduce the flow cross-section

  coolant and increase the circulation speed.

  Similarly these FIG. 1 to FIG. 6 represent a deflector (2) placed above the heaters to drain the fluid towards the outside of the central chimneys at (4) and impose a

  direction of circulation well distributed over 360 o as shown

  tee by the arrows in FIG. 1 to FIG. 6.

  These devices (3) and (2) thus make it possible to improve

  the natural circulation of the heat transfer fluid around

  from the very source of heat and increase the thermal efficiency

mique of the whole.

  With reference to these drawings, the device includes a space

  (4) filled with a different primary fluid which can

  - 3 - ask one. clean expansion circuit, the temperature of which may vary depending on the outside temperature for

  obtain a power reserve, reduce the risk of

  taring and radiation losses.

  The device according to the invention is particularly intended for

  n6 for domestic hot water production and heating

  central in domestic or industrial installations.

  The dimensions of the devices and their calorific value can be identical to what is traditionally done -4 -

Claims (4)

-R E V E N D I C A T I 0 N S -   1) Device to increase the yield and reduce the   cost of operating an electric water heater or boiler   triques characterized in that it comprises a reservoir (1) in which is placed a central chimney (7) comprising a shutter disc (3) and, covering this central chimney   trale, a deflector (2) imposes on 360 o a direction of circulation   lation to the heat transfer fluid following the arrows in FIG. 1 to FIG. 6.   2) Device according to claim 1 characterized in that the central chimney (7) concentrates and centralizes the   heat produced by 1 or more resistors   these electrics (8) housed in its lower part.   3) Device according to claim 1 or claim   2 characterized in that the central chimney (7) can receive   see inside or outside its upper part of the coils (10 and 11) for reheating circuits separate secondary.   4) Device according to claim 3 characterized in that   that the central chimney (7) can be produced by a   simple annular driver (6) with one or two coils   (10 and 11) to heat the secondary circuits separate ones.   ) Device according to claim 4 characterized with regard to the simple annular heater (6) can be replaced by a double annular heater (13) for   heating of separate secondary circuits.