Cooling system

FIELD: heating.

SUBSTANCE: cooling system refers to heat engineering, namely to heat mass exchange, and can be used for cooling of different heat releasing elements by removing heat from them to a cooler of any type by a heat pipe. The cooling system comprises a heat pipe as well as a heat releasing element and a cooler which are installed at the opposite pipe ends and are in thermal contact with the pipe. The heat releasing element and the cooler are set with the shift to the heat pipe centre according to the required heat resistance and transferred heat power of the cooling system.

EFFECT: proposed solution allows for significant decrease of cooling system's heat resistance and increase of the power it transfers due to slight shift of the said elements In a particular application example, provided the heat releasing element and the cooler are shifted by 10% of the heat pipe length, the heat resistance decreased by 22% and the transferred heat power increased from 180 W to 220 W.

3 dwg

 

The proposed device relates to the field of heat, namely, teplomassoobmena, and can be used for cooling various fuel elements by diversion from them heat through the heat pipe to the cooler of any type.

Known air cooling system (Heat pipe with powder capillary structure and structural elements on their basis for air systems electro Converter equipment and electronic equipment"catalogue of Belarusian Republican NGO powder metallurgy, Minsk.), containing the heat pipe in the form of a cylindrical copper tube with powder capillary and water as a coolant, fuel element in the form of radioelement noise through it an electric current is mounted on the heat conducting plate (theplaystation)that is installed on the heat pipe at one of its ends, and a cooler in the form of a series of plates, soldered perpendicular to the heat pipe at the second end. The disadvantage of this system is the low transmitted heat capacity and large thermal resistance of the cooling system.

Known cooling module selected for the prototype (SUBE TU, date of publication, 15.12.2008, Rosatom), which contains a heat pipe in the form of an aluminium profile with longitudinal to pellarini grooves and ammonia as a coolant, fuel element in the form of a transistor, ustanovlennogo heat pipe on one end, and cooler in the radiator mounted on the other end of the heat pipe and blows cold air through the fan, while the heat-generating element and the heat sink of the cooler are in thermal contact with the heat pipe, as shown on the dimensional drawing SUBI GC.

The disadvantage of the prototype is low transmitted heat capacity and large thermal resistance of the cooling system.

The technical task of the invention is to reduce thermal resistance of the cooling system and increase the maximum transmitted heat capacity.

To solve the technical problems of the design of the cooling system containing a heat pipe and mounted on its opposite ends, in thermal contact with it, the fuel element and the coolant, and fuel element and the coolant are offset to the middle of a heat pipe in accordance with the required thermal resistance of the transmitted and thermal capacity of the cooling system.

The figure 1 shows schematically the cooling system and the brine circuit in the heat pipe.

The figure 2 shows the dependence of thermal resistance of the cooling system R sistdepending on the simultaneous movement of the fuel element and the coolant relative to the respective ends of the heat pipe on the value of Lcm.

The figure 3 shows the dependence of the transmitted thermal capacity of the cooling system RTdepending on the simultaneous movement of the fuel element and the coolant relative to the respective ends of the heat pipe on the value of Lcm.

The cooling system includes a heat pipe 1 and in thermal contact with heat-generating element 2 and the cooler 3, and the heat-generating element 2 is displaced relative to one end of the heat pipe at a distance of LSMTPand the cooler 3 is displaced relative to the second end of the pipe length Lsmahltowards the middle of the heat pipe 1. Inside the heat pipe is located around the perimeter of the capillary channels 4 and in the center of the pipe steam channel 5.

The system works as follows. In the initial state, the fluid in the sealed heat pipe 1 is in a liquid state, completely fills the capillary channel 4 and partially steam channel 5. When heated, the heat-generating element 2, the coolant evaporates in the area of this element and removes the heat from the walls of the heat pipe 1, and through them from the heat-generating element 2, finding the gosia in thermal contact with the heat pipe 1. As a result of this heat-generating element 2 is cooled. After evaporation of the coolant in the form of steam enters the steam channel 5, it is moved to the area of installation of the cooler 3, as shown in figure 1, there is condensed on the cold walls of the heat pipe 1 and is held in the capillary channels 4, moving to the evaporator due to forces of surface tension and pressure difference of vapor in the evaporation zone and the condensation zone of the heat pipe.

thermal resistance of the cooling system contains three components

Rsist=RTV-TT+RTT+RTT-OHL, deg/W,

where RTV-TT- thermal resistance between the heat-generating element and a heat pipe;

RTT- thermal resistance of the heat pipe;

RTT-OHL- thermal resistance between the heat pipe and the cooler.

At the same time

where TTV- the temperature of the fuel element;

TThe OHL- the temperature of the cooler;

PT- thermal power allocated to the fuel element.

Based on the physics of the processes of heat transfer, the amount transferred to the unit of time heat is numerically equal to the heat capacity allocated to the fuel element RTproportion to the speed of circulation of the coolant in the heat pipe. Therefore, clean the Dimo this speed increase, changing the brine circuit to achieve the maximum value of the velocity of circulation, and hence the maximum value of the transferred heat power. The path of circulation of the coolant in the heat pipe, in addition, must pass through the zone of a fuel element (evaporation zone) and the zone of cooler (condensation zone), hinging through the steam channel and the capillary channels of the heat pipe between these elements, and in the intervals between these elements and the corresponding end of the tube. If the gap between the pipe end and the specified element is not present, then the circuit will pass through the corresponding element only partially, the area of thermal contact is reduced, the corresponding thermal resistance RTV-TTor RTT-OHLis growing. In addition, the flow rate of liquid or vapor at the wall of the pipe end equal to zero (stationary wall) and only gradually increases up to the maximum flow rate as the distance from the tube end. This leads to the reduction of the flow velocity in this area, and hence in the whole heat pipe, thus growing RTT, RTV-TT, RTT-OHLand decreases the maximum transmitted heat capacity, which is a consequence of the manifestation of the effect of edge.

To reduce such influence is necessary is to increase the distance designated reversal of flow of fluid from the pipe end. This will increase the average speed of flow of the heat pipe, which will lead to lower RTT, RTV-TT, RTT-OHL,and hence their sum Rsistand growth of the PTand in addition, the flow of coolant will pass through the entire heating surface of the heat pipe of the fuel element and the entire area of the heat from the heat pipe cooler that will lead to the reduction of RTV-TT, RTT-OHLand thermal resistance of the cooling system in General.

In addition, the speed of movement of the liquid coolant under the action of surface tension forces can be reduced by preventing the flow of fluid to the differential pressure of steam in the evaporation zone and the condensation zone. In the proposed system this difference is smaller, since the vapor pressure in the evaporation zone is partially cleared towards the end of the heat pipe and preventing the flow of fluid pressure decreases. In the condensation created the conditions for the passage of steam into the zone between the cooler and the end of the heat pipe, the pressure in the direction of the fluid accelerates its movement through the capillaries in the evaporation zone.

Thus, the displacement of the fuel element and coolant from the ends of the heat pipe to the middle solves both problems of the invention is the reduction of thermal resistance Rsistand the increase of the transferred heat is th power of R T.

Were produced and tested prototypes of the cooling system that contains the following elements:

- heat pipe in the form of an aluminum tube ⌀12.5 mm, length 360 mm capillary in the form of a number of longitudinal grooves along the perimeter of the tube and the coolant in the form of ammonia;

- fuel element - transistor type IRFP150 on teplonositeli in the form of copper plates;

- cooler in the radiator with blowing his fans.

The cooling system is tested with different values of LSMTPand Lsmahlfrom zero to values at which the change in thermal resistance Rsistand the increase of the transferred heat power PTwith further increase in LSMTPor Lsmahlno longer evident. Zero offsets are consistent with the system prototype, the rest of the cooling system. The maximum value of the achieved effect is obtained when installing the fuel element at a distance of LSMTP=40 mm and cooler at a distance of Lsmahl=40 mm, as can be seen from the graphs of figure 2 and figure 3. It is established that for a particular refrigeration system at a fixed temperature difference between the fuel element and the coolant is equal to 18.5°, thermal resistance of the cooling system Rsistcan be reduced to 1.22 times, 0,103 deg/W to 0,084 deg/watt transmitted heat capacity of P Tcan be increased from 180 watts to 220 watts, that is 1.22 times. Specific values of LSMTPand Lsmahlare selected based on the required values of Rsistand PTand design requirements to the elements of the cooling system, such as total length and configuration of the heat pipe and other

Cooling system containing a heat pipe and mounted on its opposite ends, in thermal contact with it, the fuel element and the coolant, characterized in that the fuel element and the coolant are offset to the middle of a heat pipe in accordance with the required thermal resistance of the transmitted and thermal capacity of the cooling system.



 

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