CN102297511A - Heat pump heat water made of nano phase change heat storage material - Google Patents
Heat pump heat water made of nano phase change heat storage material Download PDFInfo
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- CN102297511A CN102297511A CN2011102111698A CN201110211169A CN102297511A CN 102297511 A CN102297511 A CN 102297511A CN 2011102111698 A CN2011102111698 A CN 2011102111698A CN 201110211169 A CN201110211169 A CN 201110211169A CN 102297511 A CN102297511 A CN 102297511A
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Abstract
The invention discloses a heat pump water heater made of a nano phase change heat storage material. The heat pump water heater comprises a condenser filled with the nano phase change energy storage material, a compressor, a throttle element and an evaporator. The heat pump water heater is characterized in that the evaporator absorbs heat from air for evaporating a heat transfer work medium; after the work medium is compressed by the compressor, the temperature and the pressure are improved; and when high-temperature steam is condensed into liquid through the nano energy storage type condenser, the released heat is transmitted to the nano phase change energy storage material and is stored. When a user uses hot water, the nano phase change material releases heat energy for heating water in a hot water pipe. According to the heat pump water heater, the heat transfer performance of the phase change energy storage material is improved and the energy storage density is high, so that the speed of energy storage and release of the phase change material is increased, further the storage efficiency of energy is improved and the phase change energy storage water heater is more energy-saving and is wider in application range.
Description
Technical field
The invention belongs to field of water heaters, be specifically related to the Teat pump boiler of nano phase change heat storage material.
Background technology
The energy is the basis of human survival, is the matter of utmost importance of economic development.But along with the continuous development of society, the demand of the energy constantly increases, and fossil energy reduces the energy-conservation life of more and more going deep into people because of its storage capacity.And needed hot water major part all obtains by special water heater (as electric heater, gas heater etc.) in the domestic households daily life at present.These devices all are the tow taste heats that exchanges equivalent amount with high-grade energy for, do not meet modern energy-conservation principle.This is that 40 ~ 50 ℃ domestic hot-water seems very meaningful with regard to making the research and development New-type water heater for bathing users such as family, hotel provide temperature.
The phase-changing energy storage material heat accumulation water heater, utilize contrary Carnot's principle, compressor sucks the low-temp low-pressure gas refrigerant from evaporimeter, by doing manual work cold-producing medium is compressed into high temperature and high pressure gas, high temperature and high pressure gas enters condenser and the nanometer energy storage material carries out heat exchange, is condensed into liquid, the heat that discharges in condenser, the nano phase change energy storage material absorbs the heat of its release and temperature constantly rises, and undergoes phase transition after being elevated to uniform temperature.The high pressure low temperature liquid that is condensed is after expansion valve throttling step-down, effect by fan in evaporimeter, thus the heat that absorbs in the ambient air evaporates into low-pressure gas, is absorbed in the compressor again and compresses, conversion so repeatedly, thus phase-changing energy storage material is melted fully.
But because traditional phase-changing energy storage material heat transfer coefficient is low, thereby phase-changing energy storage material melts and setting time is long, has reduced the operating efficiency of phase-change accumulation energy water heater, and energy-saving effect is not obvious.This application and popularization to the phase-change accumulation energy water heater has all brought obstruction.
Summary of the invention
It is not high to the objective of the invention is to overcome traditional phase-change accumulation energy water heater phase-changing energy storage material heat transfer coefficient, and service efficiency is low, and shortcomings such as energy-saving effect difference provide a kind of Teat pump boiler of nano phase change heat storage material.This device adopts fin-tube type heat exchanger on the one hand, added monolithic devices aluminium fin to improve heat transfer coefficient by employing mode of the flat fin of expansion set outside heat-transfer pipe, in common phase-changing energy storage material, add mass fraction on the other hand and be the lamella nano-graphite of 2% high thermal conductivity coefficient, further improve the heat transfer coefficient of energy storage material, the cycle rate of accelerating its thawing and solidifying is to realize purpose of energy saving.
Technical problem to be solved by this invention is to provide the nanometer energy storage material that a kind of volume is little, in light weight, easy to use, flexible for installation, heat transfer coefficient is high, Energy Efficiency Ratio is high phase-change heat accumulation water heater.
This device mainly is the heat transfer property that improves phase-changing energy storage material, the speed of phase-change material energy storage and release is accelerated, thereby improved the energy efficiency of storage, makes this device more energy-conservation and the scope of application is more extensive.
For overcoming the above problems, technical scheme of the present invention is:
The Teat pump boiler of nano phase change heat storage material comprises cold water inlet 1, hot water outlet pipe 4, phase-change accumulation energy case 5, compressor 11, thermodynamic cycle pipe 12, controller 13, evaporimeter 14, throttling arrangement 16, fan and Filter dryer 17; Described phase-change accumulation energy case 5 comprises inner bag 8 and shell, is provided with heat exchange coil 10 in the inner bag, and 80% space is filled with the nano phase change energy storage material between described heat exchange coil 10 and the inner bag; Described heat exchange coil 10 is made up of condensing heat-exchange coil pipe 21 and hot water heat exchange coil 22, condensing heat-exchange coil pipe 21 and hot water heat exchange coil 22 are alternately arranged, the two ends of condensing heat-exchange coil pipe 21 are condensing agent inlet 18 and condensing agent outlet 19, condensing agent inlet 19 is connected with compressor, evaporimeter 14, throttling arrangement 16 and Filter dryer 17 successively by thermodynamic cycle pipe 12, and Filter dryer 17 is connected to condensing agent and exports 19; The two ends of hot water heat exchange coil 22 connect cold water inlet 1 and hot water outlet pipe 4 respectively; Described controller 13 links to each other with the motor power circuit of the motor power circuit of compressor 11, fan 15 respectively by lead and the temperature sensor 20 that is located in the nano phase change energy storage material links to each other, described nano phase change energy storage material is to be to add the lamella nano-graphite in non-conductive organic heat storage medium of 45～90 ℃ in phase transition temperature, and the percentage by weight of lamella nano-graphite is 2% in the nano phase change energy storage material.
The preparation method of described nano phase change energy storage material is: at 70 ℃～80 ℃ drying 8～10h, heating using microwave 15～20s is expanded to expanded graphite again, and this expanded graphite is joined in the ethylene glycol, mixes with expansible graphite; Ball milling 8～10h then with the suspension filtered behind the ball milling, drying, obtains the lamella nano-graphite, joins liquid, phase transition temperature be under constantly stirring in non-conductive organic heat storage medium of 45～90 ℃, and add surfactant.
Described phase transition temperature is that non-conductive organic heat storage medium of 45～90 ℃ is tetradecylic acid, paraffin or polyethylene glycol.
Mode by the flat fin of expansion set outside heat exchange coil 10 is equipped with flat fin 23, forms the finned tube of monolithic devices, to improve heat transfer coefficient.
Described throttling arrangement 16 is expansion valve or capillary.
Described temperature sensor 20 is a platinum resistance temperature sensor.
Described phase-change accumulation energy case 5 is aluminum, stainless steel or steel box section.
Described condensing heat-exchange coil pipe 21 is to be made of some groups of coil pipe parallel connections, and preferably by three groups of coil pipe parallel connections, each group coil pipe is to be in series by several U-shaped pipes, and the flow direction in the coil pipe is from top to bottom, and it is mobile to turn back from the bottom to top again,
On the pipeline of hot water heat exchange coil 22 connection cold water inlets 1 check valve 2 is installed; On connection hot water outlet pipe's 4 the pipeline stop valve 3 is installed;
Compressor sucks the low-temp low-pressure gas refrigerant from evaporimeter, by doing manual work cold-producing medium is compressed into high temperature and high pressure gas, this high temperature and high pressure gas is condensed into liquid in condenser, the heat that discharges, the nano phase change energy storage material absorbs the heat of its release and temperature constantly rises, and melts fully at last.When needing hot-water supply, cold water enters the phase-change accumulation energy case, carries out heat transmission with the nano phase change material that melts, and phase-change material lowers the temperature, solidify and discharge a large amount of heat (mainly being latent heat) and make water temperature reach requirement fast.
Compare with technology with existing equipment, beneficial effect of the present invention has:
1, added monolithic devices aluminium fin by employing mode of the flat fin of expansion set outside heat-transfer pipe in the heat storage box of the present invention, increased heat exchange area, heat transfer efficiency improves.Can more fast water temperature be elevated to and require temperature;
2, the present invention adopts the nano phase change energy storage material, has solved that traditional phase-change material thermal conductivity factor is low, the problem of heat transfer property difference, the speed of having accelerated the phase-changing energy storage material fusing effectively and having solidified; When the interpolation mass fraction is 2% lamella nano-graphite, hot rerum natura the best of phase-changing energy storage material, its liquid thermal conductivity speed improves 78%, and solid conductive heat speed improves 52%.
3, adopt phase-changing energy storage material as 2 thermals source among the present invention, solved and directly might cause the danger of leaking electricity with electrical heating water, safety coefficient is higher;
4, the present invention is because phase-change accumulation energy case volume ratio tradition water tank is little, and pressure-bearing is little, can be designed to different shapes such as square, circle, can better match with building;
5, be welded welding quality height, thereby compact conformation, seal height among the present invention between heat exchanger tube and the casing by soldering;
6, the invention provides a kind of good looking appearance, volume is little, load-bearing is little, simple in structure and cheap nanometer energy storage material phase-change heat accumulation water heater allows people are more in life to enjoy the advantage that high-tech brings.
Description of drawings
Fig. 1 is the structural representation of nanometer energy storage material phase-change heat accumulation water heater of the present invention;
Fig. 2, the 3rd, the condensing heat-exchange coil pipe in the phase-change accumulation energy case and the structural representation of hot water heat exchange coil;
Fig. 4 is the fluid-flow mode schematic diagram;
Fig. 5 is the finned tube schematic diagram
Among the figure: 1-cold water inlet, 2-check valve, 3-stop valve, 4-hot water outlet pipe, 5-phase-change accumulation energy case, 6-shell, 7-insulation material, 8-inner bag, 9-nano phase change heat accumulating, 10-heat exchange coil, 11-compressor, 12-thermodynamic cycle pipe, the 13-controller, 14-evaporimeter, 15-fan, 16-throttling arrangement, the 17-Filter dryer, 18-condensing agent inlet, the outlet of 19-condensing agent, 20-temperature sensor, 21-condensing heat-exchange coil pipe, 22-hot water heat exchange coil, the flat fin of 23-.
The specific embodiment
For understanding the present invention better, the present invention will be further described below in conjunction with drawings and embodiments, but the embodiment of part is not limit so.
As shown in Figure 1, the Teat pump boiler of nano phase change heat storage material comprises cold water inlet 1, hot water outlet pipe 4, phase-change accumulation energy case 5, compressor 11, thermodynamic cycle pipe 12, controller 13, evaporimeter 14, throttling arrangement 16, fan and Filter dryer 17; Described phase-change accumulation energy case 5 comprises inner bag 8 and shell, is provided with heat exchange coil 10 in the inner bag, and 80% space is filled with the nano phase change energy storage material between described heat exchange coil 10 and the inner bag; Described heat exchange coil 10 is made up of condensing heat-exchange coil pipe 21 and hot water heat exchange coil 22, condensing heat-exchange coil pipe 21 and hot water heat exchange coil 22 are alternately arranged, the two ends of condensing heat-exchange coil pipe 21 are condensing agent inlet 18 and condensing agent outlet 19, condensing agent inlet 19 is connected with compressor, evaporimeter 14, throttling arrangement 16 and Filter dryer 17 successively by thermodynamic cycle pipe 12, and Filter dryer 17 is connected to condensing agent and exports 19; The two ends of hot water heat exchange coil 22 connect cold water inlet 1 and hot water outlet pipe 4 respectively; Described controller 13 links to each other with the motor power circuit of the motor power circuit of compressor 11, fan 15 respectively by lead and the temperature sensor 20 that is located in the nano phase change energy storage material links to each other, described nano phase change energy storage material is to be to add the lamella nano-graphite in non-conductive organic heat storage medium of 45～90 ℃ in phase transition temperature, and the percentage by weight of lamella nano-graphite is 2% in the nano phase change energy storage material.When temperature sensor 20 places got temperature and reach certain setting value (a little more than phase transition temperature), slave controller 13 places spread out of the signal of telecommunication and they are quit work for the motor power circuit of compressor 11, the motor power circuit of fan 16.
The preparation method of described nano phase change energy storage material is: expansible graphite is placed 70 ℃ the dry 8h of thermostatic drying chamber, heating using microwave 15s again, under micro-wave oven produces moment high temperature, be expanded to expanded graphite, and this expanded graphite joined in the small beaker that fills 100ml ethylene glycol mix; And at room temperature this ethylene glycol/EG is placed the planetary ball mill instrument, ball milling 8h preparation becoming lamella nano-graphite; Then the suspension filtered behind the ball milling is dried, that the pure lamella nano-graphite that obtains joins under constantly stirring is liquid, phase transition temperature is in 45～90 ℃ the non-conductive heat storage medium, and adding Brij35 or Qu Latong X100, continue to stir 1h it is uniformly dispersed, thereby prepare the stabilized nano phase-changing energy storage material.
With this heat storage medium of paraffin is example, find when the interpolation mass fraction is 2% lamella nano-graphite through experiment, and hot rerum natura the best of phase-changing energy storage material, its liquid thermal conductivity speed improves 78%, and solid conductive heat speed improves 52%.
Mode by the flat fin of expansion set outside heat exchange coil 10 is equipped with flat fin 24, forms the finned tube of monolithic devices, to improve heat transfer coefficient.Described throttling arrangement 17 is expansion valve or capillary.Described temperature sensor 21 is a platinum resistance temperature sensor.On the pipeline of hot water heat exchange coil 23 connection cold water inlets 2 check valve 1 is installed; On connection hot water outlet pipe's 4 the pipeline stop valve 3 is installed;
During preheating, connect power supply, evaporimeter 14 is draw heat evaporation heat transfer working medium from the air source, the compressed machine 11 compression back temperature and pressures of working substance steam rise, time heating nano phase change energy storage material 9 and condensation become liquid to high-temperature vapour by condensing heat-exchange coil pipe 22, nano phase change energy storage material 9 undergoes phase transition, heat is stored, the working medium that is condensed into liquid flows out condensator outlet, by the moisture in the Filter dryer 18 filtration drying liquid, the throttling arrangement 17 decompression throttlings of flowing through become low pressure liquid, become low-pressure gas and finish once circulation absorbing heat in the air sources by evaporimeter 14.When the value of the temperature sensor 20 at the temperature point place that is positioned at phase-change accumulation energy case 5 is higher than the phase transition temperature of the value of design temperature a(design temperature a a little more than the nano phase change heat accumulating 9 that is adopted) time, this moment, the motor at 13 pairs of compressors 11 of controller sent signal, make it out of service, preheating work is finished.
When needing to use hot water, cold water flows into hot water heat exchange coil 22 and enters that nano phase change heat accumulating 9 carries out heat exchange in the phase-change accumulation energy case 5 by cold water inlet 1,9 coolings of liquid nanometer phase-change heat-storage material, be solidified as solid, thereby heating cold water, make it can be used for daily life, heated hot water flows into the hot water outlet pipe 4 from hot water heat exchange coil 22, supplies with daily water consumption.If hot water demand's amount is bigger, can when adding hot water, open compressor, heat.
Shown in Fig. 2,3, condensing heat-exchange coil pipe and hot water heat exchange coil adopt the form of intersection stringing, and in the form arrangement and energy storage case of tube bank with equilateral triangle.Described condensing heat-exchange coil pipe 21 is to be made of 3 groups of coil pipe parallel connections, and each group coil pipe is to be in series by several U-shaped pipes, and the flow direction in the coil pipe is from top to bottom, and it is mobile to turn back from the bottom to top again,
Shown in Fig. 3,4, in order to guarantee enough heat transfer temperature differences between fluid and the nanometer energy storage phase-change material, with water route and cold-producing medium each minute 3 tunnel, turning back up and down 2 times in every road, converges outflow heat exchanger then in liquid trap in this device.
As shown in Figure 5, the heat exchanger tube in this device all adopts copper tube, and adds fin by the mode of expansion set outside pipe, to strengthen heat transfer.
Added mass fraction in the nano phase change energy storage material of the present invention and be 2% lamella nano-graphite, mixed last whole heat transfer efficiency and improved 20%.
Claims (8)
1. the Teat pump boiler of nano phase change heat storage material comprises cold water inlet (1), hot water outlet pipe (4), phase-change accumulation energy case (5), compressor (11), thermodynamic cycle pipe (12), controller (13), evaporimeter (14), throttling arrangement (16), fan and Filter dryer (17); Described phase-change accumulation energy case (5) comprises inner bag (8) and shell, is provided with heat exchange coil (10) in the inner bag, it is characterized in that, 80% space is filled with the nano phase change energy storage material between described heat exchange coil (10) and the inner bag; Described heat exchange coil (10) is made up of condensing heat-exchange coil pipe (21) and hot water heat exchange coil (22), condensing heat-exchange coil pipe (21) and hot water heat exchange coil (22) are alternately arranged, the two ends of condensing heat-exchange coil pipe (21) are condensing agent inlet (18) and condensing agent outlet (19), condensing agent inlet (19) is connected with compressor, evaporimeter (14), throttling arrangement (16) and Filter dryer (17) successively by thermodynamic cycle pipe (12), and Filter dryer (17) is connected to condensing agent outlet (19); The two ends of hot water heat exchange coil (22) connect cold water inlet (1) and hot water outlet pipe (4) respectively; Described controller (13) links to each other with the motor power circuit of the motor power circuit of compressor (11), fan (15) respectively by lead and the temperature sensor (20) that is located in the nano phase change energy storage material links to each other, described nano phase change energy storage material is to be to add the lamella nano-graphite in non-conductive organic heat storage medium of 45～90 ℃ in phase transition temperature, and the percentage by weight of lamella nano-graphite is 2% in the nano phase change energy storage material.
2. Teat pump boiler according to claim 1, it is characterized in that, the preparation method of described nano phase change energy storage material is: with expansible graphite at 70 ℃～80 ℃ drying 8～10h, heating using microwave 15～20s again, be expanded to expanded graphite, this expanded graphite is joined in the ethylene glycol, mix; Ball milling 8～10h then with the suspension filtered behind the ball milling, drying, obtains the lamella nano-graphite, joins liquid, phase transition temperature be under constantly stirring in non-conductive organic heat storage medium of 45～90 ℃, and add surfactant.
3. Teat pump boiler according to claim 1 and 2 is characterized in that, described phase transition temperature is that non-conductive organic heat storage medium of 45～90 ℃ is tetradecylic acid, paraffin or polyethylene glycol.
4. Teat pump boiler according to claim 2 is characterized in that, described surfactant is the surfactant of polyoxyethylene laurel ether class or Qu Latong class.
5. Teat pump boiler according to claim 3 is characterized in that, the mode by the flat fin of expansion set outside described heat exchange coil (10) is equipped with flat fin (23), forms the finned tube of monolithic devices.
6. Teat pump boiler according to claim 5 is characterized in that, described throttling arrangement (16) is expansion valve or capillary.
7. Teat pump boiler according to claim 6 is characterized in that, described temperature sensor (20) is a platinum resistance temperature sensor.
8. Teat pump boiler according to claim 7 is characterized in that, described phase-change accumulation energy case (5) is aluminum, stainless steel or steel box section.
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| CN2011102111698A CN102297511A (en) | 2011-07-27 | 2011-07-27 | Heat pump heat water made of nano phase change heat storage material |
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| CN2011102111698A CN102297511A (en) | 2011-07-27 | 2011-07-27 | Heat pump heat water made of nano phase change heat storage material |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105466014A (en) * | 2015-12-25 | 2016-04-06 | 浙江力德节能科技有限公司 | Heat pump hot water unit |
| CN105805819A (en) * | 2016-05-10 | 2016-07-27 | 厦门大学嘉庚学院 | Novel solar floor heating system based on phase change material |
| CN107741070A (en) * | 2017-10-18 | 2018-02-27 | 上海交通大学 | A kind of air source hot pump water heater high density heat accumulation all-in-one |
| CN108954823A (en) * | 2018-06-07 | 2018-12-07 | 合肥美的暖通设备有限公司 | Phase-change heat-storage Teat pump boiler and its control method and device, storage medium |
| CN110345542A (en) * | 2019-07-03 | 2019-10-18 | 西安交通大学 | A kind of composite material and heat reservoir based on microwave heating and its working method |
| WO2021000585A1 (en) * | 2019-07-03 | 2021-01-07 | 西安交通大学 | Composite phase change material for microwave heating energy storage and preparation and energy storage method therefor |
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| CN1563812A (en) * | 2004-03-12 | 2005-01-12 | 华南理工大学 | Critical heat accumulating heat pump water heater |
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| CN1563812A (en) * | 2004-03-12 | 2005-01-12 | 华南理工大学 | Critical heat accumulating heat pump water heater |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105466014A (en) * | 2015-12-25 | 2016-04-06 | 浙江力德节能科技有限公司 | Heat pump hot water unit |
| CN105466014B (en) * | 2015-12-25 | 2018-04-17 | 浙江力德节能科技有限公司 | Heat-pump hot-water unit |
| CN105805819A (en) * | 2016-05-10 | 2016-07-27 | 厦门大学嘉庚学院 | Novel solar floor heating system based on phase change material |
| CN107741070A (en) * | 2017-10-18 | 2018-02-27 | 上海交通大学 | A kind of air source hot pump water heater high density heat accumulation all-in-one |
| CN108954823A (en) * | 2018-06-07 | 2018-12-07 | 合肥美的暖通设备有限公司 | Phase-change heat-storage Teat pump boiler and its control method and device, storage medium |
| CN108954823B (en) * | 2018-06-07 | 2020-11-27 | 合肥美的暖通设备有限公司 | Phase-change heat storage type heat pump water heater, control method and device thereof and storage medium |
| CN110345542A (en) * | 2019-07-03 | 2019-10-18 | 西安交通大学 | A kind of composite material and heat reservoir based on microwave heating and its working method |
| WO2021000585A1 (en) * | 2019-07-03 | 2021-01-07 | 西安交通大学 | Composite phase change material for microwave heating energy storage and preparation and energy storage method therefor |
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Application publication date: 20111228 |