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Coaxial air to air heat exchanger for circumferential window frame installation

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Coaxial air to air heat exchanger for circumferential window frame installation

The circumferential and coaxial heat exchanger, consisting of frame, ducts for supplied and discharged air, as well as fans, is characterized in that, it is made up of at least one internal diaphragm (1), situated coaxially with the external enclosure (2) and separating at least two tightly divided coaxial ducts (3) and (4) for the supplied and discharged air. The internal diaphragm (1), separating the air ducts (3) and (4) is made of material combining high thermal conductivity, resistance to corrosion and adequate strength parameters (preferably aluminium alloys), and the shape of its cross-section is corresponding to the to the shape of external enclosure (2).
Related Terms: Air Heat Exchanger

Inventor: Jacek Olaf Klimaszewski
USPTO Applicaton #: #20120285666 - Class: 16510434 (USPTO) - 11/15/12 - Class 165 
Heat Exchange > Intermediate Fluent Heat Exchange Material Receiving And Discharging Heat >Including Means To Move Gaseous Heat Exchange Material

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The Patent Description & Claims data below is from USPTO Patent Application 20120285666, Coaxial air to air heat exchanger for circumferential window frame installation.

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This is the National Stage of International Application PCT/PL2010/00033, with an international filing date of Apr. 30, 2010, which claims priority to Polish patent application P.390218, filed on Jan. 18, 2010.


The invention relates to a circumferential and coaxial heat exchanger, in particular used for the stabilization of required temperature level in heated and/or cooled accommodations.


In the known solutions, the necessary heat energy within the heated accommodations is provided by four basic groups of the heat sources: located in the accommodations water, gas and electric radiators, stoves and fireplaces, air conditioners with additional heating function, as well as the air heated outside of accommodation and supplied by suitable ducts; systems making up the accommodation equipment, e.g. radio and TV equipment, cookers, irons, lighting, water heaters, etc.; humans and animals present in the accommodation, solar radiation, mainly penetrating through the windows.

In the case of air-conditioned accommodations, the air is cooled (conditioned) by cooling of the air in basically two types of air-conditioners: in the recent solutions, by air conditioners, cooling the air that is present in the accommodation (practically working in closed air cycle), in the older solutions, by air-conditioners, cooling the air supplied from the outside of accommodation.

In both solutions, in order to maintain the given temperature level in accommodation, the heating and cooling equipment is using the energy from the outside of the operated system. With the growth in the temperature difference between the accommodation and surroundings, the energy consumption becomes higher, which results from the thermodynamics principle, saying about equalization of energy levels. In the case of accommodations, such a process proceeds intrinsically, by the heat energy transmission through the walls, floors, ceilings and through the windows or doors (significance of this way depends on the level of thermal insulation of these elements), the heat energy emission mainly through the transparent elements (e.g. window panels), and also to some extent in a forced way, by replacing of heated/cooled air in the accommodation, for the “fresh” air from surroundings, through open or half-open windows, all kinds of leakages (so called unsealing of windows), gravitational ventilating ducts, mechanical machinery forcing-in or pumping out air from the accommodation (e.g. air intake/exhaust systems, fans, or certain types of air-conditioners).

As the specific solution, are so called systems of supply-exhaust ventilation with heat recuperation, consisting in making use of the so called heat exchangers of air-to-air type, in the existing ventilation systems.

From the Polish Utility Model No 60658, known is a solution of heat exchanger working in the forced system of mechanical supply-exhaust ventilation, where the medium participating in the heat exchange is a warm air carried away from the accommodation, and cold air drawn-in from the outside. The flow of air carried away from the accommodation takes place through thin-walled, flexible air pipes, built-in within the heat-insulating jacket-type enclosure. Drawn-in from outside cold air is supplied to the heat exchanger through the intake air connector pipe. Exchange of heat between the two media takes place through the lateral surface of flexible air pipes, within the whole volume of heat-insulating enclosure. Heated in the heat exchanger intake air, drawn-in from the outside, is carried away by outlet air connector pipe to the ventilation system installed in the accommodations. Whilst the cooled air, supplied from the accommodation by inlet collecting pipe, after passing through the heat exchanger is carried away by outlet collecting pipe through air pipes to the outside.

Among the disadvantages of such solution one can mention: necessity of introducing of additional system within the building, which requires servicing and maintenance, significant decrease in efficiency in the case of necessity of using longer air ducts, troublesome installation of necessary air pipes in new buildings, and often a lack of possibility of their installation in the existing buildings, difficult regulation of the system, and maintaining of assigned parameters of air in the individual accommodations, troublesome operation and maintaining of the safe level of system hygiene.

Another solution of the air-to-air type heat exchanger is a system of convection ventilation in a form of recuperator, located in the window frame, or glass doors, known from the German Patent Description DE 3802583. In this solution, the ducts supplying the air are situated in parallel with regard to each other, whereas the openings for air inlet and outlet are situated side-by-side in the upper part of frame. The air flow can be additionally assisted by the fans, situated on the outside part of frame, whilst the whole heat exchanger is reinforced by a special section.

This system is characterized by low output, which is due to the fact, that the length of the heat exchanging part of ducts is limited mainly to the vertical part of window or doors frame. The horizontal elements of frame are used as the location of air inlets and outlets, as well as that for the fans.

The low output of discussed system is affected by mutual location of the ducts, which is significantly reducing the surface of heat exchange. Another disadvantage is close location of the air inlet and outlet ports, resulting in a partial mixing up of the drawn-in and blown out air streams. Also the metal section, that is stiffening the window frame serves as an external enclosure of heat exchanger portion only, and is not actively involved in a desirable exchange of heat.

There are known also air-to-air heat exchangers, as described in the Patent Application EP1640552 or Utility Model Application DE 8337249, however in both solutions the air supply and outlet ducts are also situated side-by-side and in parallel with relation to each other, adhering one to another by one wall only, which also has a worsening effect on the low output of the whole system.

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US 20120285666 A1
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Air Heat Exchanger

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