FR2479434A1 - Powder type heat exchanger - has space between primary and secondary circuits packed with high conductivity powder - Google Patents

Abstract

The powder type heat exchanger allows visual detection of losses. This is in a circuit in which it forms an outer sealed box (1). Each end has a window and each end of the box is fitted head plates (2) supporting the front (11). Heat exchange between the secondary circuit (13,14) and the primary one (9,10) is given by filling compartments (15) with high conductivity powder. The outer box is of metal or plastics and the complete item can be fitted on a wall, pedestal or supports. The secondary circuit is pressurised and includes an entry non return valve.

Description

 The present invention relates to heat exchangers for heating and reheating sanitary water in accordance with the requirements of the sanitary regulations published in the Official Journal of 13.09.78. (ART. 16-9).

 In known devices of this kind there are two-tube exchangers whose heat exchange is done either by juxtapo sition of the tubes of the primary and secondary circuit welded between them, or by the addition of fins.

 There are also exchangers immersed in an accumulated volume, either in a balloon or in a water heater. There are also intermediate exchangers whose heat exchange takes place in the air trapped in a heat-insulated volume, this results in more or less valid exchange values.

 The high conductivity powder intermediate heat exchanger, object of the present invention offers the advantages of a high efficiency heat exchanger, which by its own design, makes it possible to detect any leak in the primary circuit or in the secondary circuit , requirement of the decree of the newspaper Offi ciel of 13.09.78 art. 16-9.

The intermediate powder heat exchanger is in the form of a very thick steel parallelepiped having external and internal protection either by hot-dip galvanization, or by enameling, or by an epoxy resin. also be made of polypropylene
As shown in the drawing, it also includes
2 2 le eorps 1 two head plates welded to the body. Two glasses 3 and 5 are each held by a removable waterproof frame 4 and 6 allow the visualization of any leak by coloring the powder.

 N In the lower part between the two head plates is welded on its four edges a sheet 7 to form the separation and elevation box 8 of the circuits.

The coil forming the primary circuit inlet 9 and outlet 10 is housed inside the separation tubes of the primary and secondary circuits. 11
Two tubules 12 facilitate the filling of the high conductivity powder composed of disodium or trisodium phosphate mixed with a non-toxic dye.

 Two other pipes 13 and 14 are assigned to the inlet and the outlet of the secondary use circuit, and to the mounting of the non-return valve members in order to avoid running under vacuum.

 The fluid resulting from possible leaks will pass through the white powder which will tint on contact and will fall by gravity in the lower part of the compartments 15 and be detected by one or other of the probes 16 which are connected by an electric cable 17 to the audible alarm, and when the exchanger stops automatically by closing a solenoid valve placed in the circuit used.

 The intermediate powder heat exchanger, object of the invention, finds its utility in the heating or reheating of domestic water from solar collectors with heat transfer fluid, whether it be water, glycol, or any other fluid.

 The exchanger thus designed is adaptable to all existing hot water tanks or water heaters.

Claims (3)

1. Powder heat exchanger to visually detect any  leak in the circuits on what it consists of an external box  waterproof I fitted with a 3 @ t5 glass at each end. Inside the cais  two t @ te 2 plates supporting beam II are inserted.  thermal age between the use circuit 13-14 and the primary circuit  9-10 being ensured by the completion of compartimonts 15 and fai @ o @ au  II of a high conductivity powder. 2. Thematic exchanger according to revondication I characterized by the external box  laughing who is on metal or plastic can receive all the  shapes and dimensions required by the usage needs.  constituted will be of the wall type, or on base, or on supports. 3. Heat exchanger according to revondication I characterized by the circuit I3-I4  under pressure, on which is mounted on the I3 atree an anti-return olapot, evi  so much the operation @n depression.