CN109294523A - A kind of cold accumulation air-conditioner - Google Patents

A kind of cold accumulation air-conditioner Download PDF

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Publication number
CN109294523A
CN109294523A CN201811213280.9A CN201811213280A CN109294523A CN 109294523 A CN109294523 A CN 109294523A CN 201811213280 A CN201811213280 A CN 201811213280A CN 109294523 A CN109294523 A CN 109294523A
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China
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phase
change
conditioner
air
cold accumulation
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CN201811213280.9A
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Chinese (zh)
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陈威
周明新
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浙江大学山东工业技术研究院
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Publication of CN109294523A publication Critical patent/CN109294523A/en

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    • CCHEMISTRY; METALLURGY
    • C09DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09KMATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K5/00Heat-transfer, heat-exchange or heat-storage materials, e.g. refrigerants; Materials for the production of heat or cold by chemical reactions other than by combustion
    • C09K5/02Materials undergoing a change of physical state when used
    • C09K5/06Materials undergoing a change of physical state when used the change of state being from liquid to solid or vice versa
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24FAIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F5/00Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater
    • F24F5/0007Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater cooling apparatus specially adapted for use in air-conditioning
    • F24F5/0017Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater cooling apparatus specially adapted for use in air-conditioning using cold storage bodies, e.g. ice
    • F24F5/0021Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater cooling apparatus specially adapted for use in air-conditioning using cold storage bodies, e.g. ice using phase change material [PCM] for storage

Abstract

The present invention relates to air-conditioning technical fields, more particularly to a kind of cold accumulation air-conditioner, cold accumulation air-conditioner, including refrigeration unit, heat exchanger plates, phase-change material cold-storage device, user's air-conditioning, refrigerating water pump and water pump, the phase-change material cold-storage device carries air conditioner cold accumulation phase-change material comprising hydrated salt, hydroxyl carbon nano tube and thin porous layer graphene.It makes full use of heating conduction excellent possessed by graphene itself, self-lubrication and the high characteristic combined, and graphene is designed to cellular, to solve the problem of phase separation of phase-changing energy storage material, further improves the heat storage and cold accumulation performance of phase-change material.

Description

A kind of cold accumulation air-conditioner

Technical field

The present invention relates to air-conditioning technical fields, and in particular to a kind of cold accumulation air-conditioner.

Background technique

It is energy-saving to realize, it mitigates power supply shortage and electricity supply and demand is unbalance, China takes a series of regulation hands Section, such as carry out Peak-valley TOU power price system energetically.Cold accumulation air-conditioner can realize " peak load shifting " of electric power, effectively reduce power grid and hold Amount is one of the energy conservation measure that country widelys popularize.

At present, Cold Storage Material for Air Conditioning mainly has water, ice and 3 kinds of phase-change material.Water cold storage utilizes water between 4~7 DEG C Sensible heat carries out cold-storage, and conventional refrigeration unit can be used, and realizes the double duty of cold-storage and accumulation of heat.To the research master of water cold storage Concentrate on dynamic analog and analysis of running economical efficiency.There are many disadvantages for water cold storage: storage density of cold is low, and reservoir volume is huge Greatly;The water of different temperatures is easy mixing in cold-storage groove, influences the storage cooling capacity in cold-storage groove.Ice storage is that one kind makes full use of phase The cold-storage mode for becoming latent heat, has many advantages, such as that cheap, performance is stable, latent heat is big, at home using more in central air-conditioning. But ice storage phase transition temperature is low, keeps evaporating temperature of the refrigeration machine when ice making fills cold 8~10 DEG C lower than conventional non-cold accumulation system, this The adoptable refrigeration machine type of chilling air conditioning system is not only limited, and refrigeration machine COP is caused to decline, makes the operation of refrigeration machine Efficiency reduces by 30%~40%.

The shortcomings that air-conditioning system that phase-change material carries out phase change cold-storage can overcome above-mentioned water and ice-storage system has big Energy storage density, be 5~14 times of equal volume sensible heat stored substance, can directly adopt conventional refrigerant unit carry out cold-storage, mention The evaporating temperature and COP value of high refrigeration unit, so as to improve the capacity usage ratio of system.

Therefore it develops suitable phase transition temperature phase-change material and receives the extensive concern of people, become the heat of research in recent years Point.

Phase-change material can be divided into inorganic phase-changing material and organic phase change material by chemical composition.Organic phase change material includes pair Benzenediol, PEG, hexadecane etc., inorganic phase-changing material can be divided into alloy, metal and hydrated salt.Hydrated salt is most important one Kind Inorganic phase change energy storage material, it has, and thermal coefficient is high, latent heat of phase change is big, price is low, does not have many advantages, such as combustibility, but It is that it has the shortcomings that supercooling, mutually separates, leaks.

Common hydrated salt has MgCl in phase-change material2·6H2O, CaCl2·6H2O, NaSO4·10H2O, wherein six water Closing calcium chloride is a kind of highly important inorganic hydrous salt phase transition material.29 DEG C of its phase transition temperature, phase transformation enthalpy are 191J/g Left and right.But its problem of phase separation limits its application.

Six calcium chloride hydrates first pass around two-phase section in temperature-fall period, and subsequent peritectoid forms crystal.In crystallization process Little particle is formed in two-phase section to settle in liquid hydrated salt due to the effect of gravity, is precipitated, and it is small to form high density in bottom Particle, these little particles cannot fully absorb moisture, therefore be unable to complete the process of peritectoid, to occur mutually to separate, this phase Separation can cause the disappearance of phase-change material phase change energy storage function.

Summary of the invention

Technical solution provided by the present invention provides a kind of completely new cold accumulation air-conditioner, using completely new cold-storage phase-change material, Heating conduction excellent possessed by graphene itself, self-lubrication and the high characteristic combined are made full use of, graphene is designed At cellular, to solve the problem of phase separation of phase-changing energy storage material, the heat storage and cold accumulation of phase-change material is further improved Energy.

Based on this, the present invention provides a kind of cold accumulation air-conditioner, including refrigeration unit, heat exchanger plates, phase-change material cold-storage device, use Family air-conditioning, refrigerating water pump and water pump, the phase-change material cold-storage device carry air conditioner cold accumulation phase-change material comprising hydrated salt, Hydroxyl carbon nano tube and thin porous layer graphene.

Wherein, the mass ratio of three kinds of ingredients of the air conditioner cold accumulation phase-change material is hydrated salt: hydroxyl carbon nano tube: more Hole thin graphene=1:1~1.2:0.3~0.5.

Wherein, the specific preparation method of the hydroxyl carbon nano tube is to mix multi-walled carbon nanotube with sodium hydroxide, Add ethanol in proper amount, after the ball mill grinding regular hour, reactant is washed with deionized to neutrality, is subsequently placed into vacuum It is dried in drying box.

Wherein, the mass ratio that uses of the multi-walled carbon nanotube and sodium hydroxide is 1:10~20.

Wherein, the usage amount of the ethyl alcohol is that every 1g sodium hydroxide uses 2mL~3mL ethyl alcohol.

Wherein, the milling time is 15~20 hours.

Wherein, hydrated salt can be Magnesium dichloride hexahydrate, six hydrated sulfuric acid sodium, six calcium chloride hydrates.

Wherein, the phase-change material the preparation method comprises the following steps:

Six calcium chloride hydrates and a small amount of deionized water are added in the first step in the reaction vessel, heat under conditions of 75 DEG C 2-3 hours;

Second step is proportionally added into hydroxyl carbon nano tube and thin porous layer graphene in the reaction vessel of the first step, It stirs evenly, is placed in refrigerator and refrigerates 12 hours, take out and place 20 hours in air, obtain inorganic phase-changing material;

Third step coats inorganic phase-changing material using paraffin, and specially paraffin is added in n-hexane, completely molten Solution is then added the phase-change material that second step obtains, is stirred at room temperature 5 hours, mixing speed 400rpm, then filters, Filtration cakes torrefaction obtains the inorganic phase-changing material of paraffin cladding.

By adopting the above-described technical solution, the beneficial effects of the present invention are:

Technical solution provided by the present invention provides a kind of completely new cold accumulation air-conditioner, using completely new cold-storage phase-change material, Heating conduction excellent possessed by graphene itself, self-lubrication and the high characteristic combined are made full use of, graphene is designed At cellular, to solve the problem of phase separation of phase-changing energy storage material, the heat storage and cold accumulation of phase-change material is further improved Energy.

Detailed description of the invention

The DSC heating curve and temperature lowering curve of the phase-change material of Fig. 1 embodiment of the present invention preparation;

The overall structure figure of Fig. 2 cold storage air conditioning apparatus provided in an embodiment of the present invention.

In figure: 1- refrigeration unit, 2- refrigerating water pump, 3- phase-change material cold-storage device, 4- heat exchanger plates, 5- water pump, 6- user are empty It adjusts.

Specific embodiment

The present invention provides a kind of air conditioner cold accumulation phase-change material comprising hydrated salt, hydroxyl carbon nano tube and thin porous layer Graphene.We have found in the research of early stage, and carbon nanotube is used in phase-change material, passes through Van der Waals between carbon nanotube Power links together, the passage of heat of formation rule, and is further modified to carbon nanotube, and being formed, there is the carbon of many hydroxyls to receive Mitron has hydroxy functional group abundant in carbon nano tube surface, has very high water absorbability, facilitate by forming water It closes key and improves the stability and reliability of hydrated salt, and be beneficial to the absorption of liquid hydrated salt.

Although carbon nanotube improves a lot for the thermal conductivity of phase-change material, due to carbon nanotube Van der Waals force and Big specific surface area makes carbon nanotube be difficult to disperse when preparing nano-fluid.But it have been found that thin graphene has Good self-lubrication and the high characteristic combined, make entire phase transformation System forming high fluidity, on the one hand make point of carbon nanotube It is more preferable to dissipate property, can preferably construct thermal conducting path, on the other hand, the addition of the thin graphene with self-lubrication makes whole A phase transformation system continuously shifts and reduces the coefficient of friction of medium and inorganic particulate, this is for forming high fluidity, high volume point Several phase transformation systems is highly beneficial, reduces and is deposited to liquid hydrated salt bottom possibility in the little particle that two-phase section is formed, makes whole Body system density is evenly distributed, and little particle comes into full contact with water, completes the process of peritectoid.Furthermore graphene is designed to porous Shape closes the stability and reliability that surface tension effects improve hydrated salt using the capillarity of porous structure.

The mass ratio of three kinds of ingredients is hydrated salt: hydroxyl carbon nano tube: thin porous layer graphene=1:1~1.2: 0.3~0.5, preferably 1:1:0.4.

The hydroxyl carbon nano tube specific adds suitable the preparation method comprises the following steps: multi-walled carbon nanotube is mixed with sodium hydroxide Amount ethyl alcohol is washed with deionized reactant to neutrality, is subsequently placed into vacuum drying after the ball mill grinding regular hour It is dried in case.

The mass ratio that uses of the multi-walled carbon nanotube and sodium hydroxide is 1:10~20, further preferred 1:15.

The usage amount of the ethyl alcohol is that every 1g sodium hydroxide uses 2mL~3mL ethyl alcohol, further preferred 2mL.

The milling time is 15~20 hours, preferably 20 hours.

The thin porous layer graphene is prepared using chemical vapour deposition technique comprising:

The first step keeps heating rate by nickel foam stick as in CVD reactor, being warming up to 800 DEG C under the conditions of argon gas 10 DEG C/min, the throughput 280cm of argon gas3/ min,

Second step is subsequently passed hydrogen, hydrogen flowing quantity 150cm3/ min leads to the subsequent high temperature of reactor of continuing rising of 5min extremely 1000℃;

Third step, is subsequently passed methane gas, and the usage amount of methane is 30cm3/ min is maintained at carbon in 1000 DEG C of methane Atom is deposited in nickel foam, carries out the growth 20min of thin porous layer graphene, is closed methane gas, is down to room temperature;

The nickel foam for being deposited with thin porous layer graphene is taken out, is placed in hot hydrochloric acid solution and impregnates 10min by the 4th step, Chemical attack is carried out, nickel foam is removed, product taking-up, which is placed in hot acetone solution, impregnates 10min, obtains thin porous layer graphene.

Hydrated salt can be Magnesium dichloride hexahydrate, six hydrated sulfuric acid sodium, six calcium chloride hydrates, preferably six chloride hydrates Calcium.The hydrated salt uses 40% matter by the hydrated salt by associated salts by crystallization acquisition high-purity, such as six calcium chloride hydrates The calcium chloride solution of amount percentage carries out crystallization acquisition.

The phase-change material the preparation method comprises the following steps:

Six calcium chloride hydrates and a small amount of deionized water are added in the first step in the reaction vessel, heat under conditions of 75 DEG C 2-3 hours;

Second step is proportionally added into hydroxyl carbon nano tube and thin porous layer graphene in the reaction vessel of the first step, It stirs evenly, is placed in refrigerator and refrigerates 12 hours, take out and place 20 hours in air, obtain inorganic phase-changing material;

Third step coats inorganic phase-changing material using paraffin, and specially paraffin is added in n-hexane, completely molten Solution is then added the phase-change material that second step obtains, is stirred at room temperature 5 hours, mixing speed 400rpm, then filters, Filtration cakes torrefaction obtains the inorganic phase-changing material of paraffin cladding.

The present invention also provides a kind of cold accumulation air-conditioners, including refrigeration unit, heat exchanger plates, phase-change material cold-storage device, Yong Hukong It adjusts, refrigerating water pump and water pump, the application phase-change material is housed on phase-change material cold-storage device.

The refrigeration unit is connect by pipeline with refrigerating water pump, phase-change material cold-storage device, phase-change material cold-storage device with Refrigerating water pump connect by pipeline with heat exchanger plates, yet another face, user's air-conditioning and water pump by piping connection, and pass through pipeline and Heat exchanger plates connection.

Refrigerant is flowed through refrigeration unit cooling, is transported in phase-change material cold-storage device to phase transformation by refrigeration unit operation Material cooling, meanwhile, another side ducts of phase-change material cold-storage device send out refrigerant, by freezing in pump reflux host, The other side, refrigerant flow through heat exchanger plates, and with the water coke slurry heat for flowing through heat exchanger plates, water passes through user's air-conditioning.

Below using embodiment and attached drawing come the embodiment that the present invention will be described in detail, how skill is applied to the present invention whereby Art means solve technical problem, and the realization process for reaching technical effect can fully understand and implement.

The preparation of thin porous layer graphene

By nickel foam stick as in CVD reactor, being warming up to 800 DEG C under the conditions of argon gas, keep 10 DEG C of heating rate/ Min, the throughput 280cm of argon gas3/ min is subsequently passed hydrogen, hydrogen flowing quantity 150cm3It is subsequent of continuing rising high anti-to lead to 5min by/min Answer device temperature to 1000 DEG C;It is subsequently passed methane gas, the usage amount of methane is 30cm3/ min is maintained in 1000 DEG C of methane Carbon atom is deposited in nickel foam, carries out the growth 20min of thin porous layer graphene, is closed methane gas, is down to room temperature;It will sink Product has the nickel foam of thin porous layer graphene to take out, and is placed in hot hydrochloric acid solution and impregnates 10min, carries out chemical attack, removes de-soak Foam nickel, product taking-up, which is placed in hot acetone solution, impregnates 10min, obtains thin porous layer graphene.

The preparation of hydroxyl carbon nano tube

Multi-walled carbon nanotube and sodium hydroxide are mixed according to the ratio of mass ratio 1:15, add ethyl alcohol, every 1g sodium hydroxide Using 2mL ethyl alcohol, after ball mill grinding 20h, reactant is washed with deionized to neutrality, is subsequently placed into vacuum oven Middle drying.

Embodiment 1

Six calcium chloride hydrates and a small amount of deionized water are added in the reaction vessel, heats 3 hours, obtains under conditions of 75 DEG C Obtain hydrated salt, in mass ratio hydrated salt: hydroxyl carbon nano tube: thin porous layer graphene=1:1:0.4 is preparing hydrated salt Hydroxyl carbon nano tube and thin porous layer graphene are further added in container, stirs evenly, it is small to be placed on refrigeration 12 in refrigerator When, taking-up is placed 20 hours in air, and inorganic phase-changing material is obtained, and paraffin is added in n-hexane, is completely dissolved, and is then added Enter previously obtained inorganic phase-changing material, be stirred at room temperature 5 hours, mixing speed 400rpm, then filter, filter cake is dry It is dry, obtain the inorganic phase-changing material of paraffin cladding.

Comparative example 1

Six calcium chloride hydrates and a small amount of deionized water are added in the reaction vessel, heats 3 hours, obtains under conditions of 75 DEG C Obtain hydrated salt, in mass ratio hydrated salt: hydroxyl carbon nano tube: thin porous layer graphene=1:1:0.4 is preparing hydrated salt Hydroxyl carbon nano tube and thin porous layer graphene are further added in container, stirs evenly, it is small to be placed on refrigeration 12 in refrigerator When, taking-up is placed 20 hours in air, and inorganic phase-changing material is obtained, and paraffin is added in n-hexane, is completely dissolved, and is then added Enter previously obtained inorganic phase-changing material.

Comparative example 2

Compared with Example 1, thin porous layer graphene is not added.

The thermal performance analysis of phase-change material

Using the hot property of differential scanning calorimetry (differential scanning calorimeter DSCQ20) measurement phase-change material.Phase-change material It is loaded into aluminium DSC disk, and purifies sample room (50mL/min) with nitrogen, 10 DEG C/min of sweep speed used in the test, Temperature range control is from -50 DEG C to 80 DEG C.

The enthalpy of phase change of 1 different materials of table compares

Melting enthalpy (J/g) Crystallization enthalpy (J/g) Comparative example 2 109.1 95.6 Comparative example 1 120.6 105.3 Embodiment 1 125.9 109.8

As it can be seen from table 1 comparing the comparative example 2 without addition thin porous layer graphene, being added to thin porous layer graphite The melting enthalpy of the phase-change material of alkene increased, and illustrate the addition of thin porous layer graphene, and the crystallization enthalpy of phase change of three kinds of materials It is below fusion enthalpy, this may be the special crystallization process due to six calcium chloride hydrates, and there are two steps, i.e. four water of the first step for it Close the formation of calcium chloride and the peritectic reaction of second step mixture.

Figure it is seen that the inorganic phase-changing material II for being not added with the phase-change material I of graphene, not coated by paraffin Crystallization temperature with the inorganic phase-changing material III coated by paraffin is respectively 1.1 DEG C, 0.5 DEG C and 2.5 DEG C.And it is not added with graphite The melting temperature of the phase-change material of alkene, the inorganic phase-changing material not coated using paraffin and the inorganic phase-changing material for using paraffin cladding Degree is respectively 28.4 DEG C, 28.7 DEG C and 28.9 DEG C, can be seen that the addition of thin porous layer graphene to six by the result of Fig. 2 The phase transition temperature of calcium chloride hydrate influences little.

Embodiment 2

Compared with Example 1, hydrated salt: hydroxyl carbon nano tube: thin porous layer graphene=1:1:0.3.

Embodiment 3

Compared with Example 1, hydrated salt: hydroxyl carbon nano tube: thin porous layer graphene=1:1:0.5.

Comparative example 3

Compared with Example 1, hydrated salt: hydroxyl carbon nano tube: thin porous layer graphene=1:1:0.1.

Comparative example 4

Compared with Example 1, hydrated salt: hydroxyl carbon nano tube: thin porous layer graphene=1:1:0.6.

The enthalpy of phase change of 2 thin porous layer graphene accounting of table compares (J/g)

Embodiment 1 Embodiment 2 Embodiment 3 Comparative example 3 Comparative example 4 Melting enthalpy 125.9 129.1 133.6 119.7 122.6 Crystallization enthalpy 109.8 112.3 115.9 106.5 107.2

In composite phase-change material, enthalpy of phase change is mainly provided by six calcium chloride hydrates, and thin porous layer graphene is for multiple The enthalpy of phase change for closing phase-change material does not contribute, but the increase of thin porous layer graphene also can correspondingly increase in composite phase-change material Add the overall molecule energy of phase-change material, so that promoting the heat storage capacity of composite phase-change material itself enhances.When thin porous layer graphite When the adding too much of alkene, the enthalpy of phase change of composite phase-change material declines again, therefore, when the additive amount of thin porous layer graphene In certain range, the molecular potential increase of the higher phase-change material of mass fraction is more obvious.

Thermal cycling stability is the key influence factor that phase-change material uses.To comparative example 2, comparative example 1 and embodiment 1 Phase-change material carries out 100 DSC scan round, the results are shown in Table 3.

3 different materials thermal stability of table compares (J/g)

The reduction of enthalpy is due to caused by the loss of the crystallization water during temperature raising and lowering in cyclic process.It arranges above Out statistics indicate that, the low ratio of the enthalpy drop of the phase-change material containing graphene be lower than without containing graphene phase-change material, circulation Stability is higher, and phase change energy storage function is more preferable.

As shown in Figure 1, cold accumulation air-conditioner provided by the invention, including refrigeration unit 1, heat exchanger plates 4, phase-change material cold-storage device 3, user's air-conditioning 6, refrigerating water pump 2 and water pump 5.

Refrigeration unit 1 is run, and refrigerant is flowed through refrigeration unit 1 and is cooled down, is transported in phase-change material cold-storage device 3 to phase Become material cooling, meanwhile, another side ducts of phase-change material cold-storage device 3 send out refrigerant, by the reflux host of refrigerating water pump 2 In, the other side, refrigerant flows through heat exchanger plates 4, and with the water coke slurry heat for flowing through heat exchanger plates 4, water passes through user's air-conditioning 6.

All above-mentioned this intellectual properties of primarily implementation, there is no this new products of implementation of setting limitation other forms And/or new method.Those skilled in the art will utilize this important information, above content modification, to realize similar execution feelings Condition.But all modifications or transformation belong to the right of reservation based on new product of the present invention.

The above described is only a preferred embodiment of the present invention, being not that the invention has other forms of limitations, appoint What those skilled in the art changed or be modified as possibly also with the technology contents of the disclosure above equivalent variations etc. Imitate embodiment.But without departing from the technical solutions of the present invention, according to the technical essence of the invention to above embodiments institute Any simple modification, equivalent variations and the remodeling made, still fall within the protection scope of technical solution of the present invention.

Claims (8)

1. a kind of cold accumulation air-conditioner, it is characterised in that: including refrigeration unit, heat exchanger plates, phase-change material cold-storage device, user's air-conditioning, Refrigerating water pump and water pump, the phase-change material cold-storage device carry air conditioner cold accumulation phase-change material comprising hydrated salt, hydroxylating carbon Nanotube and thin porous layer graphene.
2. cold accumulation air-conditioner as described in claim 1, it is characterised in that: the matter of three kinds of ingredients of the air conditioner cold accumulation phase-change material Amount is than being hydrated salt: hydroxyl carbon nano tube: thin porous layer graphene=1:1~1.2:0.3~0.5.
3. cold accumulation air-conditioner as claimed in claim 1 or 2, it is characterised in that: the specific preparation side of the hydroxyl carbon nano tube Method be multi-walled carbon nanotube is mixed with sodium hydroxide, add ethanol in proper amount, after the ball mill grinding regular hour, spend from Sub- water washing reactant is subsequently placed into vacuum oven and dries to neutrality.
4. cold accumulation air-conditioner as described in claims 1 to 3, it is characterised in that: the multi-walled carbon nanotube and sodium hydroxide make It is 1:10~20 with mass ratio.
5. the cold accumulation air-conditioner as described in Claims 1-4, it is characterised in that: the usage amount of the ethyl alcohol is every 1g sodium hydroxide Use 2mL~3mL ethyl alcohol.
6. the cold accumulation air-conditioner as described in claim 1 to 5, it is characterised in that: the milling time is 15~20 hours.
7. the cold accumulation air-conditioner as described in claim 1 to 6, it is characterised in that: hydrated salt can be Magnesium dichloride hexahydrate, six hydrations Sodium sulphate, six calcium chloride hydrates.
8. cold accumulation air-conditioner described in claim 1 to 7, it is characterised in that: the preparation method of the phase-change material is,
Six calcium chloride hydrates and a small amount of deionized water are added in the first step in the reaction vessel, and it is small that 2-3 is heated under conditions of 75 DEG C When;
Second step is proportionally added into hydroxyl carbon nano tube and thin porous layer graphene in the reaction vessel of the first step, stirring Uniformly, it is placed in refrigerator and refrigerates 12 hours, take out and place 20 hours in air, obtain inorganic phase-changing material;
Third step coats inorganic phase-changing material using paraffin, and specially paraffin is added in n-hexane, is completely dissolved, The phase-change material that second step obtains then is added, is stirred at room temperature 5 hours, mixing speed 400rpm, then filters, filter cake It is dry, obtain the inorganic phase-changing material of paraffin cladding.
CN201811213280.9A 2018-10-18 2018-10-18 A kind of cold accumulation air-conditioner CN109294523A (en)

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