Technical Field of Invention

The invention relates to a heat exchanger with movable blades used in fields such as energy efficiency, heat transfer and energy transfer, which supports an increase in turbulence amount in the flow by its movable blade form and which provides an increase in the amount of heat which flows on the blade and consecutive blades can draw from surface.

Particularly, the invention relates to a heat exchanger with movable blades which eliminates the necessity of using rigid blades, which is placed over a tube or a plate and which enables an oscillating movement in the blade by the buoyancy applied by the fluid flowing over surface.

State of art:

Devices allowing for the transfer of two or more fluids at different temperature without mixing each other or without contacting each other are called heat exchangers. Generally, fluids are separated from each other through a heat transfer surface. Generally, they have fields of use such as solid-fueled boilers, heat pumps, steam boilers, systems heated by means of various sources and cooling cycles. Heat exchangers have two primary types as plate and tubular.

Expanding the surface area in which heat transfer happens is one of the most effective methods for moving heat away from a heat resource in heat exchangers. Another critical issue for improving heat transfer is the structure of flow on the surface on which heat transfer takes place. While a fluid passes over a surface, a layer on which rate and temperature at vertical direction and at the portions close to the surface is different from flow rate and heat. This layer is called boundary layer and the structure of this layer is critical in terms of heat transfer. As this layer thickens, heat transfer worsens, therefore breaking of this layer at times improves heat transfer performance. Additionally, turbulence level as an indicator of ratio of agitation within the flow has an impact on the performance of heat transfer. The more the amount of turbulence in a flow, in other words the higher the turbulences are, the easier the transfer of heat that is taken over the surface to inner portions of flow will be, which affects the performance of heat transfer positively.

For this purpose, various applications are available in which the outer surface of the tube is increased for heating and cooling the fluid passing through a tube.

Patent document no. "US2737370" was examined as a result of the preliminary examination conducted for the state of art. In the invention of the application, a star-shaped element is added to the outer surface of the tube and an improvement in heat passage is obtained by changing the position of consecutive stars according to each other.

Patent document no. "US2765152" was examined as a result of the preliminary examination conducted for the state of art. In the invention of the application, cylindrical bar groups are placed on the outer surface of the tube in order to increase the surface outside the tube and the bars inside these groups are separated from each other so both the surface area and the turbulence level of the flow are increased and the heat transfer is improved.

Patent document no. "US5062475" was examined as a result of the preliminary examination conducted for the state of art. In the invention of the application relates to an embodiment in which the efficiency of heat exchanger is improved by changing the heat transfer surface and flow structure using sheets having a certain twist outside the tube.

Patent document no. "US6592688" was examined as a result of the preliminary examination conducted for the state of art. In the invention of the application, the surface area is increased by a corrugated aluminum plate placed between two tubes, thus heat transfer capacity is increased.

Patent document no. "US20110132590" was examined as a result of the preliminary examination conducted for the state of art. In the invention of the application relates to a heat exchanger formed by placing circular thin sheets to outer surface of the tube. Similarly, the capacity for heat transfer is obtained by increasing the surface area.

Patent document no. "2018/09949" in the preliminary examination conducted for the state of art. The abstract section in the invention of the application includes following statement: "A heat transfer plate and a heat exchanger with a plate is provided. Heat transfer plate comprises an edge portion extending along an edge of the heat plate and is corrugated in a manner to comprise alternatively arranged protrusions and valleys as seen from a first side of the heat transfer plate. Protrusion and valleys extend vertically to the edge of heat transfer plate, first of protrusions having a top portion extending on the top portion plane and first of the valleys that is adjacent to the first portion has a bottom portion extending along a bottom portion plane. The top portion of the first protrusion and the first valley base, which are connected by a main blade, finish at an end distance by the side of heat transfer plate identical to the main blade. As it is shown in the base portion of the first valley, it is characterized that a slope of the main blade with respect to the base portion plate changes between a minimum slope and a maximum slope along the top portion of the first protrusion and base portion of the first valley" .

In all systems stated in the state of the art, blades are of indeformable structure having a certain rigidity. Again, boundary layer thickness on the blade increases along the length of blade and heat transfer efficiency is affected negatively as the blade forms are definite. Therefore, blades are short in the most of applications. Short blades pose a contrast to the principle of increasing the surface area that is necessary to increase the heat transfer capacity along the length of short blade. As a consequence, the length of tube used in the heat exchanger is increased instead of the length of blade in order to increase the heat transfer capacity, so this causes the volume that is occupied by the system to increase.

Gaps between the heat exchanging blades used in the state of art are filled with foreign particles (dust, solid particles etc.) and block the air passage by congestion in time. Therefore, it is required to perform maintenance at definite intervals with regard to thermal efficiency.

Consequently, an improvement has been necessary in the technical field due to the problems mentioned above and insufficiency of the present solutions about the matter.

Obj ects of the invention :

The primary object of the invention is that it eliminates the obligation of holding the blade length short. The blades used in the new approach are of an oscillating flexible structure instead of a rigid structure. Thus, the boundary layer that is formed on the blade is deformed automatically as the blade is movable. Another object of the invention is that the movable structure of the blade supports an increase in the amount of turbulence of the blade. Thus, an increase in the amount of heat on the blade and the amount of heat which the flow in the adjacent blades may draw from the surface is enabled.

Another object of the invention is that an amount of heat transfer which is higher than heat exchangers having fixed blade in similar volume is enabled by increasing the amount of heat that may be drawn from the surface by the flow in blades.

Another object of the invention is that blades are used in a manner that the distance between blades is as short as possible in order to make the heat transfer capacity per unit volume in heat exchangers with fixed blades.

Another object of the invention is that the distance between blades changes by means of the movable blade structure, thus congestion problem of blades is prevented.

Another object of the invention is that the necessity of maintenance is reduced by preventing particle accumulation on the movable form of the blade.

The structural and characteristic features and all advantages of the invention shall be understood more clearly thanks to the following figures and detailed description stated by referring to these figures. Therefore, the evaluation must be carried out considering these figures and the detailed description.

Description of Drawings :

FIGURE -1; shows a view of the tube of the inventive heat exchanger .

FIGURE -2; shows a view of the installed state of thin blade profiles of the inventive heat exchanger on a tube. FIGURE -3; shows a view of the interaction between the outer flow and blade structure of the inventive heat exchanger.

Reference numerals

1. Blade Profile

2. Supporting Tube

Description of the invention

The inventive heat exchanger is generally composed of a blade profile (1) having a thin form and a supporting tube (2) carrying a fluid which is a heat source.

Micron-thin cut blade profiles (1) is connected on the supporting tube (2) of the heat exchanger by different bonding approaches such as soldering or welding.

A flow coming from the outside of the supporting tube (2) interacts with the blade profile (1) placed on the supporting tube (2) and applies a buoyancy on the blade profile (1) . The buoyancy that is formed lifts the blade profile (1) through the flow and causes the profile to oscillate within the flow. Rate differences which are formed between these oscillations and fluid particles increase the amount of turbulence within the fluid. The supporting tube (2) is also used in plate form.

Figure-2 shows a blade profile (1) placed on the supporting tube (2) . Bonding is shown only on a surface in the figure so as to prevent confusion. However, the application may be performed around the tube at any point along the supporting tube (2) .

The expanded blade profile (1) surfaces are formed by cutting micron-thick metal sheets having high conductivity at certain width. The cut blade profiles (1) are mounted on the surface of a heat source by bonding techniques such as welding, soldering on a heat source surface at definite intervals in a manner that a side of them corresponds to the heat source.

When fluid is transferred at a certain rate, a buoyancy is formed on the blade profile (1) surface by the interaction between the blade profiles (1) mounted on the surface and the fluid. The buoyancy that is formed positions the blade profile (1) within the fluid. The blade profile (1) entering into the fluid does not remain at a certain position, however it oscillates up and down according to the level of agitation within the flow. Due to the oscillations formed, the value of pressure within the boundary layer that is formed on the blade profile (1) changes and this change results in breaking off and detachment of boundary layer at certain rates. Therefore, the boundary layer that is formed on the surface may be enlarged to just a certain maximum thickness independent of the length of blade profile (1) . Formation of the boundary layer restarts in the portion following the separation of boundary layer from the surface.

Due to the flow mechanism, it is not necessary to determine a limit related to the boundary layer thickness for the length of blade profile (1) . Furthermore, the movement of the surface in the blade profile (1), which oscillates in the flow, causes a force that is vertical to the blade profile (1) to be applied on the flow. Consequently, the flow gains a movement vector except for the movement which it performs parallel to the axis of blade profile (1) . Movement tendencies that are formed between flow layers at different directions cause an increase in the agitations within the flow and a rise in the turbulence level. The rise in the turbulence level enables the fluid to draw more heat from the surface although the temperature difference between the blade profile (1) and flow is the same.