CN102399535A - Heat-conduction fluid - Google Patents

Abstract

The invention relates to heat-conduction fluid, which comprises the following components: 1.2-3.2 wt% of calcium chloride, 2.5-4.5wt% of absolute ethyl alcohol, 0.5-1.5wt% of sodium perborate, 1.2-2.7 wt% of sodium nitrate, 0.8-1.5wt% of potassium hydroxide, 1.2-2.7 of potassium phosphate, 0.2-0.8 wt% of benzotriazole and the rest of distilled water. The superconductive fluid disclosed by the invention has the characteristics of antifreezing property, antirust property, antifoam property, non-toxicity, environment-friendliness, stable property and good heat transmission effect. After a heat transmitter uses the heat-conduction fluid disclosed by the invention, the service life of the heat transmitter can be remarkably prolonged, and the heat transmission property of the heat transmitter can be remarkably improved.

Description

Heat-conducting fluid

Technical field

The present invention relates to a kind of heat-conducting fluid.

Background technology

The most frequently used heat-transfer medium is a water, and the heat transfer temperature scope is 5-90 ℃, at this beyond TR, because water is tending towards freezing or boiling and can not make heat transferring agent and use.The advantage of making heat transferring agent with water is that heat-transfer effect is good, with low cost, and its shortcoming is a corrosion equipment, and very easily fouling; Other heat-transfer medium commonly used also has inorganic salts; Like sodium chloride aqueous solution, calcium chloride water, this type heat-transfer medium is serious to various metals and Corrosion of Stainless Steel; At present gradually by the organic alcohols heat-transfer medium, such as the absolute ethyl alcohol aqueous solution, aqueous solution of propylene glycol replacement; Though yet single alcohol solution is lighter to the steel alloy corrosion, to carbon steel and other metal still seriously corroded.A kind of heat exchange system, if heat-transfer medium does not preferably have corrosion, so, because of the action of rust of medium, this heat exchange system leakage phenomenon will occur through the time in about 15 years, its consequence is the work-ing life that has shortened entire equipment greatly.

In addition; Make water as thermal source; Be full of whole cavity space; After must making the intravital water in chamber reach certain temperature, scatterer could compare effective heat supply to indoor, and this kind heat-supplying mode energy consumption is big, increased heat cost; And heat transfer efficiency is low, electrothermal calefactive rate is slow, waste water is many, thermo-efficiency is low, cost is high, work-ing life is short, and the problem that when utilizing thermal oil as heat-conducting liquid, exists is: cost is high, rate of heating is slow, area of dissipation is little, current consumption is high, energy utilization rate is low, cause the significant wastage of resource.

Use heat-conducting medium of the prior art, generally all form, be difficult to take into account the effect of antifreeze, antirust and antiscale by organic medium; And in the prior art because the deicing fluid production formula of different brands difference to some extent, freezing point also has nothing in common with each other, and should not use with.Use the deicing fluid of different brands with, mutual chemical reaction, easy blocking scatterer pipeline influences the use properties of interchanger, even causes scatterer to be scrapped.

For improving the shortcoming of traditional heat-dissipating device, vacuum superconductive radiator has appearred on the market, lumen of radiator is evacuated; Make its inner chamber form negative pressure, suck a small amount of superconducting fluid, under action of negative pressure; When heat medium temperature is low, 40 ℃～50 ℃ superconducting fluid with regard to gasifiable, on move and be full of the lumen of radiator space, through the heat release of scatterer outside surface; Room air is carried out heat exchange, reach the indoor heating purpose.This kind scatterer has heat transfer soon, the characteristics that thermo-efficiency is higher.But the characteristic of existing superconducting fluid is organic, has just determined that the height of the every post of this kind vacuum radiator can not be greater than 500 mm; Like height during greater than 500 mm; Superconducting fluid is just inoperative, and the superconducting fluid after the vaporization can't rise and form loop, not heat release of the raised area; Heat absorption on the contrary, every post thermal load is 70～80 watts under Δ t=64.5 ℃ situation.Little at room area, under the highly high situation, this type of superconducting radiator can't satisfy the heating requirement because of every post thermal load is little, and necessary installation is two-layer, causes waste.And, see just burning of naked light because this type of scatterer inside is organic superconductor liquid, and poisonous, to metallic corrosion, freeze at-20 ℃, be unfavorable for using at extremely frigid zones.

Summary of the invention

The object of the invention is exactly, conduct heat slow, a thermo-efficiency low shortcoming big to present employed heat-transfer medium energy consumption; Developed a kind of heat-conducting fluid; That heat-transfer medium of the present invention has is antifreeze, antirust, anti-foam, nontoxic, environmental friendliness, stable performance, characteristics that heat-transfer effect is good; Scatterer uses heat-transfer medium of the present invention, can significantly improve work-ing life and heat transfer property.

In order to solve the realization above-mentioned purpose, the invention provides following technical scheme:

A kind of heat-conducting fluid; It has following composition: calcium chloride: 1.2-3.2 wt%, absolute ethyl alcohol: 2.5-4.5 wt%, Sodium peroxoborate: 0.5-1.5 wt%, SODIUMNITRATE: 1.2-2.7 wt%, Pottasium Hydroxide: 0.8-1.5 wt%, potassiumphosphate: 1.2-2.7 wt%, benzotriazole: the zero(ppm) water of 0.2-0.8 wt% and surplus.

Preferably, use calcium chloride, potassiumphosphate to substitute SRM 935a commonly used in the prior art, contain the chromium of high price in the SRM 935a, human body or environment are all had very serious potential risk as inorganic antifreezing agent; And the anti-freezing property of calcium chloride and potassiumphosphate is excellent equally, and to human body and environmentally friendly.Wherein, the content of preferred calcium chloride is: 1.5-2.5wt%.Preferably, the content of potassiumphosphate is: 1.5-2.2 wt%.

Absolute ethyl alcohol has very excellent anti-freezing property.Content range at the application's absolute ethyl alcohol is 1.5-2.8wt%.When its content is higher than 2.8 wt%, slow to the lifting of medium anti-freezing property; And content will cause the anti-freezing property of medium not enough when being lower than 1.5 wt%.

Sodium peroxoborate, as freeze proof auxiliary, it also plays the effect of scale inhibition in the application, and the Sodium peroxoborate that adds 0.5-1.5 wt% can be eliminated the risk of calcium chloride fouling.

SODIUMNITRATE and benzotriazole are composite as corrosion inhibitor or inhibiter, and it can guarantee that spreader surface forms uniform passivation layer and organic film in the framework of the present definition, stop the further generation of corrosion reaction.Preferably, the content of SODIUMNITRATE is 1.6-2.5wt% in the present invention.Preferably, the content of benzotriazole is in the present invention: 0.2-0.5wt%.

The adding of Pottasium Hydroxide can be managed medium and is in alkaline state, the tendency of further having avoided corrosion to take place.Its suitable content is 0.8-1.5 wt% in the present invention.

Another aspect of the present invention also discloses a kind of preparation method of heat-conducting fluid, during the medium preparation; Earlier absolute ethyl alcohol is mixed with zero(ppm) water; Be heated to 30-85 ℃ at mixed solution then, add benzotriazole, after stirring; Add calcium chloride, Sodium peroxoborate, SODIUMNITRATE, potassiumphosphate and Pottasium Hydroxide again, be incubated 10-20 minute and get final product.

Compare with heat-conducting fluid of the prior art, the application's heat-conducting fluid has the following advantages:

1., freezing point is low, resistance to frost is excellent, freezing point-38 is ℃ below the degree, low temperature flowability is good.

2., specific heat is high, heat conductivity is good, vaporization losses is few.

3., the metallic conduit in the scatterer had excellent corrosion protection and scale removal effect.

4., Heat stability is good, can guarantee all have favorable cooling effect under the high and low temperature situation.

5., excellent chemical stability, guarantee long-acting antifreeze, the anti-performance of boiling, can in awide temperature range, use.

Embodiment

To combine embodiment that technical scheme of the present invention is described in detail below; The contriver it is pointed out that following examples are in order further to illustrate summary of the invention, and can not be interpreted as the restriction to the invention technical scheme.

Embodiment 1

According to the shown component of table 1 (zero(ppm) water is surplus), prepare the 1-6 heat-transfer medium according to preparation method disclosed by the invention.

The composition of table 1 heat-transfer medium (unit does, wt%, surplus is a zero(ppm) water)

Numbering	Calcium chloride	Absolute ethyl alcohol	Sodium peroxoborate	SODIUMNITRATE	Potassiumphosphate	Pottasium Hydroxide	Benzotriazole
								1	1.2	2.5	0.5	1.2	1.2	0.8	0.2
2	1.6	2.8	0.7	1.5	1.5	0.9	0.3
								3	2.0	3.2	0.9	1.8	1.8	1.0	0.5
4	2.4	3.5	1.1	2.1	2.1	1.2	0.6
								5	2.8	3.9	1.3	2.4	2.4	1.3	0.7
6	3.2	4.5	1.5	2.7	2.7	1.5	0.8

Test thermal conductivity, the water specific heat capacity of above-mentioned 1-6 heat-transfer medium under differing temps, the result is presented in the table 2 respectively.

Water specific heat capacity number (unit: W/mK) under table 2 differing temps

Use in addition in scatterer aluminum alloy sheet commonly used, the heat-transfer medium that stainless steel substrates is immersed in the application, do not observe tangible corrosion vestige in 800 hours, show that radiator material commonly used has good corrosion resisting property in heat-transfer medium of the present invention.

Claims (5)

1. heat-conducting fluid; It has following composition: calcium chloride: 1.2-3.2 wt%, absolute ethyl alcohol: 2.5-4.5 wt%, Sodium peroxoborate: 0.5-1.5 wt%, SODIUMNITRATE: 1.2-2.7 wt%, Pottasium Hydroxide: 0.8-1.5 wt%, potassiumphosphate: 1.2-2.7 wt%, benzotriazole: the zero(ppm) water of 0.2-0.8 wt% and surplus.

2. the described heat-conducting fluid of claim 1 is characterized in that the content of described calcium chloride is: 1.5-2.5wt%.

3. the described heat-conducting fluid of claim 1 is characterized in that the content of described potassiumphosphate is: 1.5-2.2 wt%.

4. the described heat-conducting fluid of claim 1, the content that it is characterized in that described SODIUMNITRATE is 1.6-2.5wt%.

5. the described heat-conducting fluid of claim 1 is characterized in that the content of described benzotriazole is: 0.2-0.5wt%.