CN109975351A - A kind of solution-air heat transfer coefficient dynamic measurement method - Google Patents
A kind of solution-air heat transfer coefficient dynamic measurement method Download PDFInfo
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- CN109975351A CN109975351A CN201910305787.5A CN201910305787A CN109975351A CN 109975351 A CN109975351 A CN 109975351A CN 201910305787 A CN201910305787 A CN 201910305787A CN 109975351 A CN109975351 A CN 109975351A
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- transfer coefficient
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N25/00—Investigating or analyzing materials by the use of thermal means
- G01N25/20—Investigating or analyzing materials by the use of thermal means by investigating the development of heat, i.e. calorimetry, e.g. by measuring specific heat, by measuring thermal conductivity
Abstract
It the invention discloses a kind of solution-air heat transfer coefficient dynamic measurement method and device, is replaced directly measuring temperature with the measurement of pressure and volume, avoids temperature and measure response time long, high to sensor dynamic performance requirements problem.The temperature and air internal energy of air under the conditions of measurement is not sprayed water；The heat transfer coefficient of casing wall is calculated using air internal energy；The temperature of air calculates the heat output of water mist according to the heat transfer coefficient of casing wall under the conditions of measurement water spray；The heat transfer coefficient of air-water mist is obtained, measurement accuracy is substantially increased.
Description
Technical field
The present invention relates to heat transfer coefficient field of measuring technique, more particularly to a kind of solution-air heat transfer coefficient dynamic
Measurement method.
Background technique
The renewable energy such as wind energy and solar energy have the characteristics that intermittent and unstability, and access power grid application faces huge
Big challenge.By taking wind energy as an example, until 2016, Chinese installation total amount reaches 1.69 hundred million kilowatts, but average annual hours of operation
No more than 1000 hours, abandonment rate lost 10,000,000,000 up to 20% or more.
Energy storage technology can Dynamic Absorption and stabilization release energy, effectively make up the intermittence and fluctuation of renewable energy
Disadvantage improves the controllability of power plant, power grid output power, improves the stability of Operation of Electric Systems.It therefore, is that solution can be again
One of the key technology of raw energy source use.
Common energy storage technology is divided into three classes: mechanical energy storage, Power Flow and chemical energy storage.Compressed-air energy storage belongs to machine
One kind of tool energy storage has energy storage scale greatly (100MWh, battery < 10MWh) compared with battery energy storage, environmental-friendly (not have
Have heavy metal pollution), long service life (40-50, battery < 20 year).
Compressed air energy storage technology bottleneck first is that low efficiency (<60%, battery>90%).Currently, most of compressed airs
Energy-storage system is all based on adiabatic compression, and since the gas compression time is short, Measurement of Gas Thermal Conductivity is small, compression heat cannot in time to
Surroundings, temperature rise rapidly, and work done during compression increases, and are converted to heat, about half of electrical power conversion at heat simultaneously
It scatters and disappears.
There are two technology paths in terms of improving compressed-air energy storage efficiency: 1, by heat of compression storage, recycling；2, reduce
Isotherm compression is realized in the generation of the heat of compression.Since compression process moment completes (Millisecond), the transient temperature of air is difficult to survey
Amount, the response time for being primarily due to temperature sensor is long, and heat-transfer character is to improve energy storage efficiency and design energy-storage system
Key, therefore, it is necessary to be measured using new method.
Summary of the invention
In view of this, the present invention provides a kind of solution-air heat transfer coefficient dynamic measurement method, with the measurement of pressure and volume
Instead of directly measuring temperature, avoids temperature and measure response time long, high to sensor dynamic performance requirements problem.
To achieve the goals above, the invention provides the following technical scheme:
A kind of solution-air heat transfer coefficient dynamic measurement method, which is characterized in that specific steps include:
1) temperature and air internal energy of air under the conditions of measurement is not sprayed water；
2) heat transfer coefficient of casing wall is calculated using air internal energy；
3) temperature of air calculates the heat output of water mist according to the heat transfer coefficient of casing wall under the conditions of measurement water spray；
4) heat transfer coefficient of air-water mist is obtained.
Preferably, in a kind of above-mentioned solution-air heat transfer coefficient dynamic measurement method, it is based on The Ideal-Gas Equation,
By the measurement of gas temperature be converted to pressure and volume, initial temperature, pressure and volume are measured, in compression process, air
Quality remain unchanged, real-time pressure and volume are measured, according to formula
The temperature of air is calculated, the work done during compression of piston is converted into the interior of gas can Δ Uair, to the heat output Q of casing wallwallWith
To the heat output Q of water mistwater, according to the initial temperature T of airair0With real time temperature Tair, the specific heat C of airv, calculate air
Interior energy
ΔUair=Cvmair(Tair-Tair0)。
Preferably, in a kind of above-mentioned solution-air heat transfer coefficient dynamic measurement method, air is measured under the conditions of not spraying water
Temperature, the area S on the inside of casing wallwall, calculate the heat transfer coefficient h of casing wallwall,
Preferably, in a kind of above-mentioned solution-air heat transfer coefficient dynamic measurement method, air is measured under the conditions of water spray
Temperature Tair, according to the heat transfer coefficient of casing wall, heat output of the air to casing wall is calculated,
Qwall=hwallSwall(Tair-Twall)；
According to the heat output Q of casing wallwallInterior with gas can Δ Uair, calculate the heat output Q of water mistwater
Qwater=-p Δ V- Δ Uair-Qwall；
Heat is absorbed, the temperature of water mist rises, according to formula
Qwater=Cwatermwater(Twater-Twater0)
With the specific heat C of waterwaterCalculate the temperature T of water mistwater, the heat transfer coefficient of air-water mist is obtained,
The surface area S of water mistwaterWith water mist quality mwaterBy measuring.
A kind of solution-air heat transfer coefficient dynamic measurement device, comprising: driving cylinder, working cylinder, water fog generator and observing and controlling
System；Wherein the water fog generator is connect with the working cylinder；The working cylinder and the driving cylinder pass through piston
Bar connection；The TT&C system controls the water fog generator and working cylinder movement respectively.
Preferably, in a kind of above-mentioned solution-air heat transfer coefficient dynamic measurement device, the working cylinder bottom passes through spray
Mouth is attached with the water fog generator；And it is provided with shut-off valve.
Preferably, in a kind of above-mentioned solution-air heat transfer coefficient dynamic measurement device, the driving cylinder passes through piston point
For the first driving chamber and the second driving chamber；Reversal valve is provided on the side wall of first driving chamber and second driving chamber.
It preferably, further include gas source in a kind of above-mentioned solution-air heat transfer coefficient dynamic measurement device；The gas source is logical
The reversal valve is crossed to be connected to first driving chamber；The TT&C system controls the reversal valve, the shut-off valve respectively.
Preferably, it in a kind of above-mentioned solution-air heat transfer coefficient dynamic measurement device, is provided on the working cylinder
Pressure sensor.
Preferably, in a kind of above-mentioned solution-air heat transfer coefficient dynamic measurement device, position is provided on the driving cylinder
Displacement sensor.
Preferably, in a kind of above-mentioned solution-air heat transfer coefficient dynamic measurement device, specific workflow is:
(1) breathing process: reversal valve work is opened in right position, shut-off valve, and gas source is inflated to the first driving chamber, the second driving
Chamber exhaust, driving cylinder push the work forward the piston upwards of cylinder；Compression chamber sucks air, and upper until piston motion stops
Point.
(2) compression process: reversal valve switches to left position, and shut-off valve is closed, and gas source is inflated to the second driving chamber, the first driving
Chamber exhaust, driving cylinder pushes the work forward, and piston moves downward for cylinder；Air in compression chamber compresses under the extruding of piston；Water
Fog generator generates high pressure water, generates water mist through nozzle, sprays into compression chamber；TT&C system acquire in real time compression chamber pressure and
Piston displacement signal.
(3) exhaust process: the piston of working cylinder is run to before lower dead center, and shut-off valve is opened, water and sky in compression chamber
Gas discharge.
It can be seen via above technical scheme that compared with prior art, the present disclosure provides a kind of heat transfers of solution-air to be
Number dynamic measurement method and device, are replaced directly measuring temperature with the measurement of pressure and volume, when avoiding temperature measurement response
Between long, high to sensor dynamic performance requirements problem.The temperature and air internal energy of air under the conditions of measurement is not sprayed water；Utilize sky
The heat transfer coefficient of casing wall can be calculated in gas；The temperature of air calculates water mist according to the heat transfer coefficient of casing wall under the conditions of measurement water spray
Heat output；The heat transfer coefficient of air-water mist is obtained, measurement accuracy is substantially increased.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
The embodiment of invention for those of ordinary skill in the art without creative efforts, can also basis
The attached drawing of offer obtains other attached drawings.
Fig. 1 attached drawing is structural schematic diagram of the invention；
Fig. 2 attached drawing is compression process energy flow diagram when the present invention does not spray water；
Compression process energy flow diagram when Fig. 3 attached drawing is present invention water spray.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
The embodiment of the invention discloses a kind of solution-air heat transfer coefficient dynamic measurement method and device, with pressure and volume
Measurement replaces directly measuring temperature, avoids temperature and measures response time long, high to sensor dynamic performance requirements problem.It surveys
The temperature and air internal energy of air under the conditions of amount is not sprayed water；The heat transfer coefficient of casing wall is calculated using air internal energy；Measure spray bar
The temperature of air under part calculates the heat output of water mist according to the heat transfer coefficient of casing wall；The heat transfer coefficient of air-water mist is obtained, significantly
Improve measurement accuracy.
Embodiment 1:
A kind of solution-air heat transfer coefficient dynamic measurement method, specific steps include:
5) temperature and air internal energy of air under the conditions of measurement is not sprayed water；
6) heat transfer coefficient of casing wall is calculated using air internal energy；
7) temperature of air calculates the heat output of water mist according to the heat transfer coefficient of casing wall under the conditions of measurement water spray；
8) heat transfer coefficient of air-water mist is obtained.
In order to further optimize the above technical scheme, it is based on The Ideal-Gas Equation, by being converted to pair for gas temperature
The measurement of pressure and volume, measurement initial temperature, pressure and volume, in compression process, the quality of air is remained unchanged, and measurement is real
When pressure and volume, according to formula
The temperature of air is calculated, the work done during compression of piston is converted into the interior of gas can Δ Uair, to the heat output Q of casing wallwallWith
To the heat output Q of water mistwater, according to the initial temperature T of airair0With real time temperature Tair, the specific heat C of airv, calculate air
Interior energy
ΔUair=Cvmair(Tair-Tair0)。
In order to further optimize the above technical scheme, the temperature of air, the face on the inside of casing wall are measured under the conditions of not spraying water
Product Swall, calculate the heat transfer coefficient h of casing wallwall,
In order to further optimize the above technical scheme, the temperature T of air is measured under the conditions of water sprayair, according to the biography of casing wall
Hot coefficient calculates heat output of the air to casing wall,
Qwall=hwallSwall(Tair-Twall)；
According to the heat output Q of casing wallwallInterior with gas can Δ Uair, calculate the heat output Q of water mistwater
Qwater=-p Δ V- Δ Uair-Qwall；
Heat is absorbed, the temperature of water mist rises, according to formula
Qwater=Cwatermwater(Twater-Twater0)
With the specific heat C of waterwaterCalculate the temperature T of water mistwater, the heat transfer coefficient of air-water mist is obtained,
The surface area S of water mistwaterWith water mist quality mwaterBy measuring.
Embodiment 2:
A kind of solution-air heat transfer coefficient dynamic measurement device, comprising: driving cylinder 14, working cylinder 15, water fog generator 20
With TT&C system 18；Wherein water fog generator 20 is connect with working cylinder 15；Working cylinder 15 and driving cylinder 14 pass through piston
Bar connection；TT&C system 18 controls water fog generator 20 respectively and working cylinder 15 acts.
In order to further optimize the above technical scheme, 15 bottom of working cylinder is connected by nozzle with water fog generator 20
It connects；And it is provided with shut-off valve 10.
In order to further optimize the above technical scheme, driving cylinder 14 is divided into the first driving chamber 9 and second by piston and drives
Dynamic chamber 8；Reversal valve 13 is provided on the side wall of first driving chamber 9 and the second driving chamber 8.
It in order to further optimize the above technical scheme, further include gas source 19；Gas source 19 passes through reversal valve 13 and the first driving
Chamber 9 is connected to；TT&C system 18 controls reversal valve 13, shut-off valve 10 respectively.
In order to further optimize the above technical scheme, working cylinder 15 on be provided with pressure sensor 11.
In order to further optimize the above technical scheme, it drives on cylinder 14 and is provided with displacement sensor 12.
In order to further optimize the above technical scheme, working cylinder 15 is connect by shut-off valve 10 with gas-liquid separator 17.
In order to further optimize the above technical scheme, as shown in Figure 1, specific workflow is:
(1) breathing process: the work of reversal valve 13 is opened in right position, shut-off valve 10, and gas source 19 is inflated to the first driving chamber 9,
The exhaust of second driving chamber 8, driving cylinder 14 push the work forward the piston upwards of cylinder 15；Compression chamber 16 sucks atmosphere 5, until
The top dead centre of piston motion.
(2) compression process: reversal valve 13 switches to left position, and shut-off valve 10 is closed, and gas source 19 is inflated to the second driving chamber 8,
The exhaust of first driving chamber 9, driving cylinder 14 pushes the work forward, and piston moves downward for cylinder 15；Air in compression chamber 16 is in piston
Extruding under compress；Water fog generator 20 generates high pressure water, generates water mist through nozzle, sprays into compression chamber 16；TT&C system 18
The pressure and piston displacement signal of acquisition compression chamber 16 in real time.
(3) exhaust process: the piston of working cylinder 15 is run to before lower dead center, and shut-off valve 10 is opened, in compression chamber 16
Water and air discharge, is separated using gas-liquid separator 17.
As shown in Fig. 2,
Each embodiment in this specification is described in a progressive manner, the highlights of each of the examples are with other
The difference of embodiment, the same or similar parts in each embodiment may refer to each other.For device disclosed in embodiment
For, since it is corresponded to the methods disclosed in the examples, so being described relatively simple, related place is said referring to method part
It is bright.
The foregoing description of the disclosed embodiments enables those skilled in the art to implement or use the present invention.
Various modifications to these embodiments will be readily apparent to those skilled in the art, as defined herein
General Principle can be realized in other embodiments without departing from the spirit or scope of the present invention.Therefore, of the invention
It is not intended to be limited to the embodiments shown herein, and is to fit to and the principles and novel features disclosed herein phase one
The widest scope of cause.
Claims (10)
1. a kind of solution-air heat transfer coefficient dynamic measurement method, which is characterized in that specific steps include:
1) temperature and air internal energy of air under the conditions of measurement is not sprayed water；
2) heat transfer coefficient of casing wall is calculated using air internal energy；
3) temperature of air calculates the heat output of water mist according to the heat transfer coefficient of casing wall under the conditions of measurement water spray；
4) heat transfer coefficient of air-water mist is obtained.
2. a kind of solution-air heat transfer coefficient dynamic measurement method according to claim 1, which is characterized in that based on ideal gas
The measurement of gas temperature be converted to pressure and volume is measured initial temperature, pressure and volume, compression by body state equation
In the process, the quality of air remains unchanged, and real-time pressure and volume is measured, according to formula
The temperature of air is calculated, the work done during compression of piston is converted into the interior of gas can Δ Uair, to the heat output Q of casing wallwallAnd Xiang Shui
The heat output Q of mistwater, according to the initial temperature T of airair0With real time temperature Tair, the specific heat C of airv, calculate the interior of air
Energy
ΔUair=Cvmair(Tair-Tair0)。
3. a kind of solution-air heat transfer coefficient dynamic measurement method according to claim 1, which is characterized in that in not spray bar
The temperature of air, the area S on the inside of casing wall are measured under partwall, calculate the heat transfer coefficient h of casing wallwall,
4. a kind of solution-air heat transfer coefficient dynamic measurement method according to claim 1, which is characterized in that in water spray condition
The temperature T of lower measurement airair, according to the heat transfer coefficient of casing wall, heat output of the air to casing wall is calculated,
Qwall=hwallSwall(Tair-Twall)；
According to the heat output Q of casing wallwallInterior with gas can Δ Uair, calculate the heat output Q of water mistwater
Qwater=-p Δ V- Δ Uair-Qwall；
Heat is absorbed, the temperature of water mist rises, according to formula
Qwater=Cwatermwater(Twater-Twater0)
With the specific heat C of waterwaterCalculate the temperature T of water mistwater, the heat transfer coefficient of air-water mist is obtained,
The surface area S of water mistwaterWith water mist quality mwaterBy measuring.
5. a kind of a kind of measuring device of solution-air heat transfer coefficient dynamic measurement method according to claim 1-4,
It is characterised by comprising: driving cylinder, working cylinder, water fog generator and TT&C system；The wherein water fog generator and institute
State working cylinder connection；The working cylinder is connect with the driving cylinder by piston rod；The TT&C system controls respectively
The water fog generator and working cylinder movement.
6. a kind of solution-air heat transfer coefficient dynamic measurement device according to claim 5, which is characterized in that the work gas
Cylinder bottom portion is attached by nozzle and the water fog generator；And it is provided with shut-off valve.
7. a kind of solution-air heat transfer coefficient dynamic measurement device according to claim 5, which is characterized in that the driving gas
Cylinder is divided into the first driving chamber and the second driving chamber by piston；It is set on the side wall of first driving chamber and second driving chamber
It is equipped with reversal valve.
8. a kind of solution-air heat transfer coefficient dynamic measurement device according to claim 7, which is characterized in that further include gas source；
The gas source is connected to by the reversal valve with first driving chamber；The TT&C system controls the reversal valve, institute respectively
State shut-off valve.
9. a kind of solution-air heat transfer coefficient dynamic measurement device according to claim 6, which is characterized in that the work gas
Pressure sensor is provided on cylinder.
10. a kind of solution-air heat transfer coefficient dynamic measurement device according to claim 7, which is characterized in that the driving gas
Displacement sensor is provided on cylinder.
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| US8482152B1 (en) * | 2009-06-29 | 2013-07-09 | Lightsail Energy, Inc. | Compressed air energy storage system utilizing two-phase flow to facilitate heat exchange |
| CN104374800A (en) * | 2014-11-18 | 2015-02-25 | 中国科学院广州能源研究所 | In-situ heat conductivity coefficient testing device and method for gas hydrate |
| CN204591385U (en) * | 2015-05-06 | 2015-08-26 | 中国科学院工程热物理研究所 | A kind of isothermal compression air energy storage systems |
| CN109340079A (en) * | 2018-09-17 | 2019-02-15 | 华北电力大学 | A kind of isotherm compression air energy storage systems and efficient electric power generation method |
-
2019
- 2019-04-16 CN CN201910305787.5A patent/CN109975351A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8482152B1 (en) * | 2009-06-29 | 2013-07-09 | Lightsail Energy, Inc. | Compressed air energy storage system utilizing two-phase flow to facilitate heat exchange |
| CN104374800A (en) * | 2014-11-18 | 2015-02-25 | 中国科学院广州能源研究所 | In-situ heat conductivity coefficient testing device and method for gas hydrate |
| CN204591385U (en) * | 2015-05-06 | 2015-08-26 | 中国科学院工程热物理研究所 | A kind of isothermal compression air energy storage systems |
| CN109340079A (en) * | 2018-09-17 | 2019-02-15 | 华北电力大学 | A kind of isotherm compression air energy storage systems and efficient electric power generation method |
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Application publication date: 20190705 |