KR20080044603A - Heat exchange system - Google Patents

Abstract

A heat exchange system is provided to expand phase transition temperature of water, to meet demand of heat exchanger performance by adding improving agents to the water and using it as heating medium. A heat exchange system(100) comprises a heat absorbing unit(1). The heat absorbing unit is coupled to a heat sink unit(2) through a path(10), and heating medium(3) is charged in the path. The heating medium charged in the path includes water as basic material, and improving agents of physical properties that are mixed with the water. A ratio of the improving agents is in the ranges of 15 to 50 volume%.

Description

Heat exchange system {HEAT EXCHANGE SYSTEM}

1 is a heat exchange system diagram,

2 is a radiator application of the present invention,

3 is a side perspective view of FIG.

4 is a layout view of the heater,

5 is a front view of a weakness preliminarily installed in a fin radiator,

6 is a side perspective view of a weakness preliminarily installed in a fin radiator and

7 is a side perspective view of a weakness and a safety device pre-installed on a fin radiator.

* Explanation of symbols for the main parts of the drawings

1: endothermic section 2: heat sink section

3: fruit object 4: burner

5: fin radiator 6: pre-crack weld

7: temperature switch 10: path

11: buffer cabinet 40: heating device

41: housing 51: pin

52: pipeline 100: heat exchange system

110: pressure release valve 510: enclosure

511: sorting side 512: collecting side

521: long side 522: short side

V: volume

The present invention relates to a heat exchange system, and more particularly, to a heat exchange system that satisfies the strength of heat transfer by combining water with a base material and combined with a heat exchange circulation path having internal pressure, and clearly solves environmental protection problems. .

The heat exchanger is generally an industrial thermostat or a circulating oil fin radiator for indoor heating, in which the medium that transfers heat is mineral oil. Although mineral oil has low specific heat and absorbs heat easily, its viscosity is not easy to flow due to its own viscosity and oil properties are often coked when subjected to high temperature heat of electric heater. When formed, it can affect the exothermic power, and the oil is likely to deteriorate and lose its effective heat transfer. Therefore, after about three years of use, the oil must be newly replaced, and even industrial use should be replaced every half year. As a result, waste oil after replacement causes major pollution problems and is no longer commonly sold in Japan.

In addition, when the electric heater is overheated, the excess internal pressure accumulates, which affects the strength of the structure, causing the pipe joint to rupture. As a result of leakage of electricity, mineral oil is ignited and easily causes a fire. It may cause loss of property.

The amount of waste oil generated as described above is currently producing more than 30 million units worldwide every year, and if the required volume of thermally conductive oil is 5 liters, multiplying this generates more than 100 million liters of waste oil. It is clear that such pollution can never be neglected, and furthermore, the recovery mechanism is the root cause of harm to the environment because it is difficult to establish due to its low economic value.

The present invention improves heat transfer conditions and phase transition temperatures due to its physical properties by using water as a base material and a mixture of modifiers. The main object of the present invention is to increase the phase transition temperature of water and to satisfy heat transfer strength while meeting the requirements of heat exchange performance.

Another object of the present invention is to obtain a heat transfer effect through the heat transfer particles by filling the high heat conductive heat transfer particles in the water.

Another object of the present invention is to increase the boiling point temperature of the sap by allowing the path space of the closed-loop heat exchange system to receive a constant pressure value to generate a relatively high internal pressure.

Another object of the present invention is to ensure that the fruit medium is filled in the path space of the closed-circuit heat exchange system, the volume ratio of the fruit medium to about 70 to 85%, leaving the expansion absorption space.

Another object of the present invention is to lower the condensation temperature by adding an antifreeze so that water can resist the low temperature.

Regarding the detailed description of the present invention, referring first to FIG. 1, the heat exchange system 100 of the present invention is provided with a heat absorbing unit 1, and passes through a path 10 to a heat sink 2. It is connected by angling (열매), the fruit medium (3) is connected in series with the heat absorbing portion (1) and the heat sink (2) while being filled in the system path (10). If implemented in the cooling system of the electronic device, it is possible to emit the heat temperature by using a wind motor from the outside of the heat sink 2, the heat absorbing portion (1) can be combined with the electronic component that generates the excess heat.

If the heat exchange system 100 is applied to a heater that improves the air temperature for indoor heating, the heater 4 is used to generate heat to the fruit object 3, which is operated by heat transfer. Since the thermoelectric is actuated by the device 4, the outer circumference is wrapped in a thermally conductive housing 41.

Correlation heating medium 3 distribution path of the heat exchange system 100 has a storage space capable of withstanding the internal pressure, it is possible to increase the boiling point temperature of the water by using the pressure against the internal pressure, the water generally can reach 100 ℃ If heat is absorbed until it becomes a phase transition, vaporization occurs. The vaporization forms an expansion pressure, which may damage the structure of the exchange system. The main conditions under which water changes from liquid to gas are pressure and pressure. It is related to the boiling point. According to the Clapeyron equation ΔP / ΔT = λ / T (V ₂ -V ₁ ), λ is latent heat, T is the boiling point, V ₂ is the volume fraction of the gas, and V ₁ is the volume ratio of the liquid. This shows that when the pressure is high, the boiling point is also high, that is, the boiling point temperature of the water in the pressure vessel is directly proportional to the magnitude of the pressure value. Thus, the boiling point temperature of water can be raised.

If the present invention is carried out in terms of a pressure vessel, the boiling point of the water can be raised to 125 ° C. The condition assumes that the internal pressure of the exchange system allows a pressure value of 0.15 Mpa. According to the experiment of the present invention, when the aqueous solution has a boiling point of 100 ° C. at atmospheric pressure (atmospheric pressure) and a closed container having a pressure of 0.1 Mpa, the boiling point is increased to 120 ° C., and the boiling point is set to 0.15 Mpa. Can reach up to 125 ° C. In addition, if the boiling point rises to 125 ° C, it is subject to the restrictions of the international safety standards of UL 130 ° C or less and the European IEC standard of 110 ° C or less. If the pressure is lowered so that the temperature is 110 ° C or less, in accordance with the European standard, The safety standard temperature can be applied to the radiator standard of the radiator system for indoor heating. By using the safety temperature to properly transfer the heat energy of the heater can be warmed the room temperature.

The fruit material 3 is charged in the internal path space of the heat exchange system 100, but the filling volume ratio is preferably about 70 to 85%, leaving about 15 to 30% of the free space in the path space. The free space immediately absorbs the volume of expansion after the fruit object 3 is ideally phased. If the environmental temperature falls below the freezing point and the fruit object 3 freezes, the volume expands or if the temperature of the fruit object 3 exceeds the boiling point due to an abnormal operation of the electric heater, the gas pressure expands and the volume expands. When is expanded, the free space is secured in advance.

When water is supplied to the heater surface to be affinity exchanged with thermal energy, if the heat energy is concentrated relatively high in a small unit area, the temperature of water that is affinity with the area rapidly vaporizes when the flow velocity of water is relatively low. Spherical bubbles can be formed, and the cross section of the bubbles can also be transferred to the heater surface to form pores. Therefore, the present invention proposes the following auxiliary solution.

Since the specific heat of water is larger than that of mineral oil and the overall temperature rise is slow, the bubble hole phenomenon formed by overheating the heater surface is solved in the following manner.

1. By adding heat transfer particles to the water to quickly bring the temperature of the heater surface to a high temperature, it accelerates the rate of bubble escape and removes bubbles.

2. The pores of the heater surface can be driven out by using the uneven drop structure of the pore section and the temperature difference between the two points so that the bubbles generated cannot be settled stably.

3. Place a net-like structure on the surface of the heater so that the structure of the bubble can be broken down and disassembled using the wire of the net.

4. Connect the ultrasonic vibrator to the heater so that the connection between the bubble and the heater surface is moved away from each other by using the vibration energy, and the bubble is released by adding the cohesive force of the liquid and liquid.

5. By using the porosity control method, if the porosity generated in the area per mm ² is maintained at 0.04 W or less on the average surface of the electric heater, the generation of pores can be effectively prevented.

In general, the purpose of heat insulation heat exchange systems is to release heat energy of a heater to a destination quickly, and the faster the speed is, the better. The mineral oil used in the past has a problem of viscosity, and since the flow is gentle and there is a possibility that a horizontal flow layer may occur in the pipe due to its gentleness, the heat of the core is difficult to be compatible with the surface of the pipe wall or the heat sink structure. The function of the exchange function may be lost.

The present invention can increase the circulation rate by using the low viscosity of the water, when the speed is increased, it is easy to form turbulence in the path, when using the turbulence, the heat carried by the fruit medium in the center of the pipe is easily mixed with the surroundings The affinity with the pipe wall makes it easy to turbulent flow around the center point and the surrounding liquid inside the pipe wall, and exchange heat energy toward the outside by being friendly to the pipe wall.

In order to improve its physical properties, the fruit medium of the present invention may be filled with an improving agent of about 15 to 50% in water at a percentage (vol%), and the improving agent may be an antiseptic or insulation agent or an ethylene glycol antifreeze agent. By using a glycol antifreeze, the condensation temperature can be reduced to about -15 ~ -40 ℃. Therefore, if the winter application in the indoor environment can prevent the situation where the fruit is frozen and can not work.

The present invention can further charge the heat transfer particles having a low specific heat inside the fruit individual (3). The heat transfer particles are metal fine particles or oxide fine particles, the fine particles are nano-structured to be easily moved by water, making it easy to absorb heat in the heat absorbing portion by using the low specific heat characteristics of the heat transfer particles and water It is transported quickly through the heat sink so that heat is quickly released.

The nanoparticles are added to the water-soluble dispersant so that the nanoparticles can be evenly distributed in the delivery medium in the water-based liquid state.

The fruit individual 3 can further prevent foreign substances and maintain stable physical properties by using pure water as a base material.

The distribution path of the correlated fruit medium 3 of the heat exchange system 100 has a pressure-pressure performance, and is operated in a vacuum state before charging the fruit medium 3 or charged in a heated state to form a negative pressure. After that, after the fruit is filled in a vacuum filling method or a negative pressure to prevent the remaining air inside, further prevents the corrosion of the heat exchanger.

If the vacuum charging method is performed as described above, one buffer cabinet 11 should be coupled to a position adjacent to the heat absorbing unit 1, and the buffer cabinet 11 absorbs excess pressure and thus instability of current. When high pressure occurs inside the system in the abnormal state of the heater (4) generated due to, it serves as a buffer of pressure to protect safety. The buffer cabinet 11 may further install a pressure release valve (110).

2, when applied to the fin radiator 5 according to the embodiment of the present invention, the radiator 5 has a plurality of fins 51 arranged in parallel, and the upper and lower ends thereof are the sorting side 511 and the collecting side ( 512) in series. The heater 4 is provided inside the flow dividing side 511, and the fin is conducted between the dividing side 511 and the collecting side 512 to form a pipeline 52. The pipeline 52 has a long hole-shaped cross section, and forms a long side 521 and a short side 522, and a ratio of both is preferably greater than or equal to 6: 1.

Referring to FIG. 3, in the fin radiator 5, the sorting side 511 and the collecting side 512 are coupled up and down to a plurality of fins 51 to form a single circulation circuit, and inside the sorting side 511. Heater 4 is provided to the heat transfer to the heating element, when the heater 4 generates heat to the heat medium (3) therein to raise the temperature, the heat medium (3) is installed in the fin 51 It floats to the top through the line 52, the power of the flotation process is caused by the dynamic behavior of the heat deformation of the material generated by the heating action of the heater, and through the flotation to operate one cold heat circulation flow To achieve the line.

Since water has a low viscosity, it can flow quickly inside the pipeline 52, and the rapidly flowing flow velocity creates turbulence in the fruit medium in the path. The turbulent state tends to be in contact with the inner wall of the pipeline 52, and heat and heat may be exchanged between the inner wall of the pipeline.

In addition, the long side 521 and the short side 522 of the pipeline 52 (refer to FIG. 2) are formed to have a 6: 1 narrowing distance so that the opposite side of the long side inner wall is close using the short side. The turbulence values are then formed according to the Reynolds number and determined by the density ρx flow rate V x median distance D / viscosity μ, obtained by the formula. If the value of the short side is relatively small and the relative D value is relatively small, turbulence may be formed inside the pipe because it is easy to break through the critical Reynolds number. According to the experimental results of the present invention, after applying the viscosity coefficient of water and multiplying each other, it is preferable that the ratio of the long side side of the pipeline cross section is long side side 6: short side side 1 (D value).

According to the present invention, the distance D of the inner surface relative surface of the long side 521 is close by using the short side 522, and then the D value is reduced by calculating the correlation Reynolds number.

The fundamental principle of the Reynolds number is the density of the fluid ρx flow rate V x median distance D / viscosity μ, where the value of the critical Reynolds number is relatively low when the D in the Reynolds equation decreases, creating turbulence in the flow inside the pipe. You can see it's easy. The equation can of course also be calculated for a pipe of circular cross section, the presence of which is already determined by the constant area and pressure. The meaning of D is the distance across the inside of the pipe wall, and in the above equation it can also be seen that if the density ρ is increased by the thermal effect, the critical Reynolds number will slowly reach, but the change is not large and unclear. Viscosity μ is determined based on the nature of the fluid.

In the above method, as a method of preventing and controlling the formation of pores on the surface of the heater at a power ratio, it is possible to adjust to the size of the heater surface area according to the needs of different power ratios, the amount of heat conduction in mm ² area divided by the power value Correspondingly possible to any heaters of different silver sizes, it is also possible to sufficiently heat the fruit individual within a unit time.

Referring to FIG. 4, under the condition that the heat exchange system 100 of the present invention is applied to the radiator 5, the radiator 5 is provided with a heater 4 inside the fractionation side 511. The heater 4 is in the form of a rod, and has an outer dimension equal to itself and a constant length. When the internal space located in each pin 51 is regarded as one unit volume V, a plurality of volume spaces V may be distinguished according to the number of pins 51.

When the fruit water is frozen at a low temperature, the internal pressure is generated by the expansion of the volume, and the expansion of the volume causes a difference in the proportional water size depending on the size of the volume space. . For example, after being expanded in proportion to each other in a space of 100 cc and 90 cc, the volume finally undergoes a phase transition of a different volume depending on the difference in the original volume and the difference in the proportional series difference. In order to homogenize the expansion volume after freezing within the unit volume per fin, the volume space belonging to the fin 51 is uniformly distributed, essentially extending the longitudinal length of the rod heater 4 to the left and right on average, so that at least its ends In order to reach the bottom of the last fin 51, the size of the volume space in each pin can be uniformized, and during the expansion process of freezing and phase transition, the expansion ratio inside the volume space of each pin is relatively even The pressure inside the single fin can be prevented from being ruptured due to excessive pressure, and the uniformity of lifespan can be controlled for each fin. Since volume of thermal energy in communication with the contact may be obtained even the thermal energy.

Referring to FIG. 5, the sorting side 511 and the collecting side 512 are connected to upper and lower ends of the fin 51 installed in the radiator 5, and the generation of the collecting side 512 is illustrated in FIG. 6. Cup-shaped enclosures 510 are inflated at upper and lower ends of the respective pins 51, and the enclosures 510 are open to the outside and faced to each other. ) Parallel to each other. Preliminary safety in the situation where the pressure release valve is ineffective when the precrack welding point (weakness) 6 is installed during the welding process and all the protective devices are ineffective at the precrack welding point 6. Can serve to protect the If the pressure release valve ceases to be effective, the pressure inside it will continue to increase along with the heater, at which time the pre-installed precrack weld 6 will rupture, releasing the pressure, thereby ensuring the safety of the overall system structure. Will protect. In general, when the internal pressure increases to 0.4-0.5 Mpa, the pre-cracks welding point 6 ruptures and excessive pressure is released from the site. Since the pre-crack welding point 6 is formed by thermal operation, welding can be performed at the same time during maintenance, so that other parts are not required, thereby protecting safety with the lowest finished product.

Referring to FIG. 7, in general, the welding spot can withstand a pressure of 10 MPa, and the mechanical conditions under which the precrack welding spot 6 can be implemented should be at least greater than or equal to the temperature pressure at which the fluid is in a normal operating state. Or other safety devices, such as a pressure release valve 11 or a temperature switch 7 that shuts itself off by sensing excessively high temperatures. The temperature switch 7 sets its safety temperature in accordance with physical properties such as temperature and pressure of the heat medium used.

When the pressure reaches up to 0.15 mpa, the temperature is about 120 ° C., therefore, if the operating temperature of the switch 7 is set to 120 ° C. or higher, the operation of the radiator 5 can be maintained at 120 ° C., and the safety of pressure Can be secured. The additional condition is that the degree of internal pressure of the welding spot should be at least 0.15 mpa or more.

As a result of the experiment of the present invention, the boiling point temperature of the medium was 105 ° C when the pressure was 0.12mpa, and the boiling point temperature of the medium was 120 ° C when the pressure was 0.15mpa. Corresponding values of the two groups can be obtained by the equation y = ax + b when the temperature-pressure relation figure is a straight line, and if the internal pressure of the welding point 6 is set to 0.3 mpa, the boiling point temperature is up to 195 ° C. Tolerable (depending on the physical properties of the media, the diagram may be curved). Therefore, in accordance with the required operating temperature, the internal pressure of the welding point 6 may be set slightly higher than the boiling threshold temperature of the medium under the condition that the boiling point temperature is not exceeded (the selection of pressure and temperature is related to the corresponding value as described above. , And is also a designated fruit entity).

Safety design of the present invention by installing a mechanical pressure release valve 110 to operate the pressure release valve at the same time the power is cut off, or by installing a temperature switch valve (7) to set the power cut operation temperature according to the need of internal pressure In addition, the pre-crack welding point 6 is to rupture in advance in preparation for the pressure situation, such that the risk is eliminated, these are all subject to the safety practice of the present invention.

The safe installation may perform auxiliary operation in sequence between each other. For example, the pressure release valve 110 or the temperature switch 7 serves as a preliminary safety protection, and when the pre-crack welding point 6 is installed as the last protection line, the temperature exceeds the work demand and the internal pressure is relatively high. When higher, the temperature cutoff switch 7 shuts off the power while protecting in advance, or when the pressure exceeds the set value, the pressure release valve 110 immediately releases the pressure or cuts off the power. If one or two kinds of bearings as described above are lost, the pre-cracker welding point 6 becomes the last bearing means and effectively protects the safety of the environment.

The above embodiment is for the system of the present invention, and the preferred embodiment has been described by taking a cyclic radiator of a pin type as an example, and it is first noted that all of these are considered to be included in the rights of the present invention when applied to a technique having similar or identical effects. .

According to the practice of the present invention, the following advantages can be obtained.

1. It has no pollution and non-combustible safety features.

2. There is no recovery problem in disposal.

3. There is no environmental pollution problem if the system leaks.

4. Since it is not flammable, it does not cause any contaminant or burn-out of household goods such as carpet after leakage.

Claims (26)

In a heat exchange system comprising a heat absorbing portion, the heat absorbing portion is directionally coupled to the heat sink portion through a path, the fruit is filled in the path, The heat exchanger is filled in the path is a heat exchange system, characterized in that the water as a base material, the physical property improving agent is mixed in the water. The method of claim 1, Heat exchange system, characterized in that the proportion of the improver is 15 ~ 50 vol%. The method of claim 1, And the improver is an ethylene glycol antifreeze agent. The method of claim 1, And the modifier is an insulation. The method of claim 1, And the improving agent is a preservative. The method of claim 1, The improving agent is a heat exchange system, characterized in that the high thermal conductivity heat transfer particles. The method of claim 6, The heat transfer particle is a heat exchange system, characterized in that the fine metal particles. The method of claim 6, And the heat transfer particle is an oxide. The method of claim 7, wherein The metal particulate is a heat exchange system, characterized in that the nanoparticles. The method of claim 1, And said water is pure water. In a heat exchange system comprising a heat absorbing portion, the heat absorbing portion is directionally coupled to the heat sink portion through a path, the fruit is filled in the path, The circulation path is provided with a heat exchange system circulation path against the internal pressure, the heat exchanger filled in the heat exchange system circulation path is a water based material, characterized in that the physical properties improving agent is mixed in the water. The method of claim 11, Heat exchange system, characterized in that the space volume ratio in the heat exchange circulation path is filled with fruit medium is 70 ~ 85%. The method of claim 11, The heat exchange system circulation path is a fin pipeline, wherein the cross section of the fin pipeline has a long hole shape. The method of claim 13, The cross section of the long hole is provided with a long side and a short side, the ratio of both is greater than or equal to 6: 1 heat exchange system. The method of claim 11, Heat exchange system, characterized in that 15 ~ 50 vol% improver is distributed in the fruit individual. The method of claim 15, The improving agent is a heat exchange system, characterized in that the ethylene glycol. The method of claim 15, And the improving agent is a preservative. The method of claim 15, And the modifier is an insulation. The method of claim 11, Heat exchange system, characterized in that the heat transfer particles are filled and distributed in the fruit medium. The method of claim 19, The heat transfer particle is a heat exchange system, characterized in that the fine metal particles. The method of claim 19, And the heat transfer particle is an oxide. The method of claim 20, The metal particulate is a heat exchange system, characterized in that the nanoparticles. The method of claim 21, And the oxide is nanoparticles. The method of claim 11, And said water is pure water. The method of claim 11, The heat exchange system is a fin radiator system, characterized in that equally distributed heaters are uniformly distributed at the bottom of all fins. The method of claim 11, The heat exchange system is a fin type heating heater, wherein each of the fins is provided with a pre-crack welding point (weakness) is preliminarily installed in the coupling portion of the mating surface enclosure.

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