AIRCRAFT COMPONENTS

HEAT EXCHANGER

I am working on heat exchagers on these days,accordingly I want to write about one of the important parts of airplanes which is called heat exchangers.

Generally,a heat exchanger is a device that is used for transfer of thermal energy between two or more fluids,between a solid surface and a fluid at differing temperaturses and in thermal contact,usually without external heat and work interactions.

Heat exchagers may be classified according to transfer process,construction,flow arragement,surface compactness,number of fluids and heat transfer mechanisms or according to process functions.

In the light of these information about heat exchangers we can think that it can be served the heating and cooling the air as using in the airplane.Where is the enough flow, especially air, produced to the heatexchangers to balance the heat? The answer is below.

Heat exchanger has a core assembly with two welded pan assemblies.The core assembly has bleed air fins and cooling air fins that are separated by plates to form hot and cold air passages that run perpendicular to each other through the heat exchanger.Sucking the ram air from the ducts of airplane located at below of the fuselage as shown above and flow comes to the primary heat exchanger that is the cold air which is used to cold enough the flow coming from the engine. After this process,the flow is send to the secondary heat exchanger and this process are repeated there to suppy quality air to the cockpit and passengers.Distrubition of this air is done by air cycling machine.This is the another componet of airplanes.

As a result,heat exchangers are served to decrease temperatures to the adequate values.This type of heat exchanger means air-to-air which is used the exchange of heat through the fins decreases the temperature of hot bleed air.