System for heating the cabin of an aircraft provided with an annular heat exchanger around the exhaust nozzle

Patent metadata

Field	Value
Publication number	US-9623723-B2
Application number	US-201414302578-A
Country	US
Kind code	B2
Filing date	Jun 12, 2014
Priority date	Jun 18, 2013
Publication date	Apr 18, 2017
Grant date	Apr 18, 2017

Abstract

A heating system ( 50 ) for heating a cabin ( 2 ) of an aircraft ( 1 ), said heating system including an annular heat exchanger ( 10 ) positioned around an exhaust pipe ( 21 ) of a turbine engine ( 20 ), and through which a heat transfer fluid ( 14 ) and ambient air ( 25 ) flow. Said heat exchanger ( 10 ) is provided with a rear casing situated at an outlet of said heat exchanger ( 10 ) and directing the ambient air ( 25 ) exiting form said heat exchanger ( 10 ) towards said exhaust gas ( 15 ) exiting via said exhaust pipe ( 21 ). Said exhaust gas ( 15 ) then generates a flow of ambient air ( 25 ) through said heat exchanger ( 10 ) by the “Coanda” effect. Said ambient air ( 25 ) flowing through said heat exchanger ( 10 ) is thus heated by convection from said pipe ( 21 ), and said heat transfer fluid ( 14 ) is heated firstly by radiation from said pipe ( 21 ) and secondly by convection between said heat transfer fluid ( 14 ) and said ambient air ( 25 ).

First claim

What is claimed is:

1. A heat exchange arrangement comprising an annular heat exchanger and a pipe, said heat exchanger, through which a first fluid flows, being positioned around said pipe, through which a second fluid flows, said second fluid exiting from said pipe via an opening in said pipe, and a third fluid flowing through said heat exchanger from an inlet of said heat exchanger to an outlet of said heat exchanger;
wherein said heat exchanger further comprises a rear casing situated at said outlet and directing said third fluid towards said second fluid exiting via said opening, the second fluid then generating a flow of said third fluid through said heat exchanger by a “Coanda effect”, heat exchange taking place between said pipe, said third fluid, and said first fluid.

2. A heat exchange arrangement according to claim 1 , wherein said heat exchange is constituted at least by heat exchange by convection between said pipe and said third fluid.

3. A heat exchange arrangement according to claim 1 , wherein said heat exchange is constituted at least by heat exchange by radiation between said pipe and said first fluid.

4. A heat exchange arrangement according to claim 1 , wherein said heat exchange is constituted at least by heat exchange by convection between said third fluid and said first fluid.

5. A heat exchange arrangement according to claim 1 , wherein said heat exchanger further comprises a thermal protection positioned at least partially between said pipe and said heat exchanger in order to limit said heat exchange with said pipe.

6. A heat exchange arrangement according to claim 5 , wherein said thermal protection is constituted by at least one heat screen formed of one or more elements chosen from a list comprising a material of a metal foam type, concentric cylindrical plates, and a honeycomb structure.

7. A heat exchange arrangement according to claim 5 , wherein said thermal protection has thermal effectiveness that increases going from said inlet towards said outlet, said heat exchange being essentially obtained firstly by radiation between said pipe and said first fluid, and secondly by convection between said pipe and said third fluid in an inlet zone of said heat exchanger while, beyond said inlet zone, said heat exchange is obtained by radiation between said pipe and said first fluid, by convection between said pipe and said third fluid, and by convection between said third fluid and said first fluid, said inlet zone being formed by a zone situated inside said heat exchanger immediately after said inlet in a direction of flow of said third fluid through said heat exchanger.

8. A heat exchange arrangement according to claim 1 , wherein, with said heat exchanger being provided with a front casing in an inlet zone of said heat exchanger, the heat exchange in said inlet zone is obtained only by convection between said pipe and said third fluid, said inlet zone being formed by a zone situated inside said heat exchanger immediately after said inlet in the direction in which said third fluid flows through said heat exchanger, said first fluid not flowing through said inlet zone.

9. A heat exchange arrangement according to claim 8 , wherein, with said heat exchanger being provided with a thermal protection positioned at least partially between said pipe and said heat exchanger, said thermal protection has thermal effectiveness that starts beyond said inlet zone and decreases going to said outlet, said heat exchange being obtained only by convection between said pipe and said third fluid in said inlet zone, and then beyond said inlet zone said heat exchange being obtained by radiation between said pipe and said first fluid, by convection between said pipe and said third fluid, and by convection between said third fluid and said first fluid.

10. A heat exchange arrangement according to claim 1 , wherein said rear casing has a convergent shape that is in contact with a peripheral portion of the flow of said second fluid exiting from the outlet of said pipe, and that extends beyond said pipe in order to bring said third fluid into contact with said second fluid.

11. A heat exchange arrangement according to claim 1 , wherein said third fluid is ambient air.

12. A heat exchange arrangement according to claim 1 , wherein said pipe is an exhaust pipe for discharging exhaust gas from an engine, and said second fluid is formed by said exhaust gas.

13. A heating system for heating a vehicle, said vehicle being provided with a cabin and with at least one engine, said heating system including at least one set of piping through which a heat transfer fluid circulates, circulator means for circulating said heat transfer fluid, and at least one heater element though which said heat transfer fluid circulates in order to heat said cabin, wherein said heating system includes a heat exchange arrangement according to claim 12 , making it possible to heat said heat transfer fluid, said heat transfer fluid being said first fluid of said heat exchanger.

14. A heating system according to claim 13 , wherein said vehicle is a rotary-wing aircraft, said engine is a turbine engine, and said pipe is constituted by at least one exhaust nozzle of at least one turbine engine.

Assignees

• Airbus Helicopters

Inventors

• Pomme Vincent

Classifications

• B60H1/18 Primary

  the air being heated from the plant exhaust gases {(B60H1/025 takes precedence)} · CPC title

• F28D7/0066

  Multi-circuit heat-exchangers, e.g. integrating different heat exchange sections in the same unit or heat-exchangers for more than two fluids (F28D7/103 takes precedence) · CPC title

• F28D2021/0021

  for aircrafts or cosmonautics · CPC title

• F28F2265/10

  for preventing overheating, e.g. heat shields · CPC title

• F28D7/0016

  the conduits for one medium or the conduits for both media being bent (F28D7/0033 takes precedence) · CPC title