# US 8,783,334 B2 · Heat exchanger particularly for thermal generators

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- Number: US 8,783,334 B2
- Document ID: US8783334B2
- Status: Granted
- Kind: B2
- Application number: 12/378,117
- Filed: 2009-02-11
- Published: 2009-09-10
- Granted: 2014-07-22
- Earliest claimed: 2008-03-10
- Assignees: FERROLI S.p.A.
- Applicants: Giandomenico Lovato
- Inventors: Giandomenico Lovato
- Web page: https://patentgrep.com/patent/US8783334B2

## CPC

- F28D 7/0058: {the conduits for only one medium being tubes having different orientations to each other or crossing the conduit for the other heat exchange medium (F28D7/0008 takes precedence)}
- F24H 1/287: {with the fire tubes arranged in line with the combustion chamber}
- F24H 8/00: Fluid heaters characterised by means for extracting latent heat from flue gases by means of condensation
- F24H 9/0026: {in combustion gas channels}
- F24H 9/17: Means for retaining water leaked from heaters
- F28D 7/00: Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall
- F28D 7/1684: {the conduits having a non-circular cross-section}
- F28F 1/02: Tubular elements of cross-section which is non-circular (F28F1/08, F28F1/10 take precedence)
- F28F 1/06: crimped or corrugated in cross-section
- F24H 1/205: {with furnace tubes}
- F28F 2210/06: having walls comprising obliquely extending corrugations, e.g. in the form of threads
- Y02B 30/00: Energy efficient heating, ventilation or air conditioning [HVAC]
- F28D: HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT (fluid heaters having heat generating means and heat transferring means F24H; furnaces F27; details of heat-exchange apparatus of general)
- F24H: FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL (steam generation F22)
- F28F: DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION (water and air traps, air venting F16)
- Y02B: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS

## Abstract

The present invention relates to a heat exchanger for transmitting heat from a gaseous primary fluid to a liquid secondary fluid. In particular, the present invention relates to the thermal exchange means proper, the main feature of which is the use of a diverging tube sheet including a plurality of four-lobe cross-section tubes.

## Claims

### Claim 1

A heat exchanger for thermal generators, said heat exchanger comprising a plurality of heat exchanger tubes, arranged in a spoke-like configuration, wherein each said exchanger tube has a four-lobe cross-section, wherein central-most heat exchanger tubes of said heat exchanger tubes are diverging from one another at their ends and a rest of said heat exchanger tubes are spaced apart a same distance at either end of a heat exchanger metal shell, wherein said four-lobe cross-sections are arranged, either with a symmetrical or an asymmetrical pattern, on a crown about a central hollow body having a circular cross-section, and wherein each said exchanger tube has a tube construction defined by a simultaneous translation and rotation of said four-lobe cross-section on a main axis of said heat exchanger.

### Claim 2 (depends on 1)

A heat exchanger, according to claim 1, wherein said diverging tubes, therethrough a primary fluid is caused to pass, are welded to two perforated plate elements, a top perforated plate element and a bottom perforated plate element, and wherein said top and bottom perforated elements comprise an upward convexity.

### Claim 3 (depends on 1)

A heat exchanger, according to claim 1, wherein said diverging tubes are attached to a discrete tube sheet arranged inside said metal shell, said metal shell having a circular, oval or elliptic base cylindric configuration, including two or more secondary fluid inlet and outlet openings, and forming a single body with said head exchanger.