CN106568804A - Dual air dry bulb temperature-based air humidity detection method - Google Patents
Dual air dry bulb temperature-based air humidity detection method Download PDFInfo
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- CN106568804A CN106568804A CN201610977309.5A CN201610977309A CN106568804A CN 106568804 A CN106568804 A CN 106568804A CN 201610977309 A CN201610977309 A CN 201610977309A CN 106568804 A CN106568804 A CN 106568804A
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- air
- vaporizer
- air humidity
- detection method
- current environment
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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
- G01N25/56—Investigating or analyzing materials by the use of thermal means by investigating moisture content
- G01N25/62—Investigating or analyzing materials by the use of thermal means by investigating moisture content by psychrometric means, e.g. wet-and-dry bulb thermometers
Abstract
The invention discloses an air humidity detection method, and the method is performed based on the evaporator of refrigeration or dehumidification equipment that is running in the current environment. The method specifically comprises the following steps of a, respectively detecting the temperature of air dry bulbs before and after passing the evaporator in the current environment; b, acquiring the operation state parameters of the refrigeration or dehumidification equipment; c, according to a relation model between the air humidity of the current environment and the parameters obtained in the step a and in the step b, calculating the air humidity of the current environment. According to the technical scheme of the air humidity detection method, only the temperature of air dry bulbs needs to be measured, while no humidity sensitive resistor or humidity sensing element is required. Compared with the prior art, the method is low in cost and good in reliability. On the premise that the high precision is ensured, the method has a wide application prospect in the fields of air conditioners, dehumidifiers and the like.
Description
Technical field
The present invention relates to a kind of measuring method of air humidity, the especially moisture measurement of the higher surrounding air of humidity.
Background technology
Air humidity be characterize air dry and wet degree or moisture content in air number physical quantity, it gives birth to people
Live and produce closely bound up, especially human comfort is had a great impact." indoor humidity will whole year for World Health Organization's regulation
It is maintained between 40%～70% ", people lives in the environment of relative humidity 45%～65% and most feel comfortable.
Mainly there is following several method to air humidity measurement：
First, hair hygrometer：Changed and flexible feature measurement sky with ambient air humidity using materials such as hair, fibers
Air humidity degree.This traditional method is simple, low cost, but poor reliability, and maintenance management is complicated, and precision is poor.
2nd, psychrometer：The method can reach higher precision, but be difficult to meet that mobility is big and miniaturization etc.
Require, be typically used as the adjustment standard of other types humidity sensor.
3rd, dew-point drimeter：Air humidity is measured indirectly by obtaining dew point temperature, and the measuring method is costly, together
When need precise control to obtain accurate close dew temperature.
4th, electronic type drimeter, including resistance-type, condenser type and photo-electric, this kind of humidity sensor and electronic equipment
Compatibility is good, therefore extensively applies in automation field, but relatively costly.
5th, microwave type drimeter：The degree measurement air humidity of microwave radiation is absorbed by air, the method adds to instrument
Work requires strict and relatively costly.
At present, it is general by the humidity sensor measurement air humidity with humistor in air-conditioning, then by control
Device is converted into the representation for needing, so as to realize the detection to air humidity and control.And the key of such humidity sensor
Part humistor is ageing-resistant and contamination resistance is poor, while being limited to the processing technique of humidity sensor, causes air wet
The generation of situations such as degree measurement is inaccurate or cannot measure.And installing humidity sensor can also improve the cost of air-conditioning, this is also
The reason for hindering this air humidity metering system to widely use on air-conditioning.
The content of the invention
The invention provides a kind of air humidity detection method, with compared to conventional moisture detection method lower cost solution
Air humidity of having determined measures problem that is inaccurate or cannot measuring.
A kind of air humidity detection method, the vaporizer reality based on the refrigeration or dehumidification equipment run under the present circumstances
Apply, specifically include：
A, the air dry-bulb temperature forward and backward through vaporizer detected respectively under current environment；
B, the running state parameter for obtaining refrigeration or dehumidification equipment,
C, the relational model for obtaining parameter according to air humidity under current environment and step a and step b are calculated works as
Air humidity under front environment.
The present invention ultimate principle be：For the vaporizer of physical dimension is determined, when the air mass flow one for flowing through
Regularly, each group of import and export air dry-bulb temperature of vaporizer correspond to unique sensible heat transfer amount, steam so as to correspondence is unique
Send out device wall surface temperature.And the unique wall surface temperature of correspondence and air mass flow, when evaporator air humidity determines, vaporizer
Moisture removal be also to determine have unique evaporator inlet-outlet air humidity poor.Therefore, if evaporator air outlet is wet
Degree is known, it is possible to the anti-air humidity for releasing evaporator, that is, current environment humidity.
And the vaporizer of summer air-conditioning device or dehumidifier is normally operated under wet cooling condition, evaporator outlet is (through vaporizer
Afterwards) relative air humidity is 95% or so, therefore can obtain current according to the two of evaporator inlet-outlet air dry-bulb temperatures
Ambient humidity.
The running state parameter of the refrigeration or dehumidification equipment includes：
The pressure fan rotating speed of refrigeration plant (such as air-conditioner) or dehumidification equipment (such as dehumidifier) at vaporizer；And
The working conditions of compressor (such as the rotating speed or frequency of compressor) of refrigeration plant or dehumidification equipment.
The relational model is the mathematical model based on physical relation between each parameter, or is trained based on data with existing and obtained
Mathematical model.
Optionally, described is neural network model based on mathematical model obtained by data with existing training, and it is with step a and step
Rapid b obtains parameter to be input into, and air humidity is output with current environment.
Preferably, the structure of the neural network model is double hidden layers, and each hidden layer nodes is 6.Can
To obtain more accurate result under suitable amount of calculation.
Optionally, the mathematical model based on physical relation between each parameter is：
maIt is the mass flow of the air through vaporizer, is obtained by pressure fan rotating speed；
d1、d2It is through the forward and backward air humidity of vaporizer, wherein d1For value to be calculated, d2Take approximation；
α is the heat transfer coefficient through between the air and evaporator surface of vaporizer；
αdIt is the mass tranfer coefficient through between the air and evaporator surface of vaporizer；
A is the total heat exchange area of vaporizer；
dsFor the corresponding saturated air water capacity of evaporator surface temperature；
CpFor the specific heat capacity of humid air；
TsFor evaporator surface temperature；
T1、T2It is through the forward and backward air themperature of vaporizer.
Preferably, the air dry-bulb temperature forward and backward through vaporizer under the current environment is respectively by being arranged on
The temperature sensing device at evaporator air side entrance and exit is measured.
Air humidity detection method of the present invention need to only measure the dry-bulb temperature of air, be not relying on humistor etc. and feel wet unit
Part, compared with prior art required cost is relatively low, good reliability, while higher precision is also ensure that, in air-conditioning, dehumidifier etc.
Aspect has wide prospect of the application.
Specific embodiment
To make the object, technical solutions and advantages of the present invention clearer, below in conjunction with the specific embodiment of the invention pair
Technical solution of the present invention is clearly and completely described.Obviously, described embodiment is only a part of embodiment of the invention,
Rather than the embodiment of whole.Based on the embodiment in the present invention, those of ordinary skill in the art are not making creative labor
The every other embodiment obtained under the premise of dynamic, belongs to the scope of protection of the invention.
Embodiment 1
A kind of air humidity detection method, comprises the following steps：
Current environment dry-bulb temperature, the air dry-bulb temperature after vaporizer process, evaporation are obtained by temperature sensing device
Device is vaporizer or the vaporizer in dehumidifier in air-conditioner；
Freezed (dehumidifying) equipment running status, including but not limited to the breeze fan rotating speed of air-conditioner or dehumidifier,
Compressor rotary speed or frequency of air-conditioner or dehumidifier etc.；
Current environment air humidity is calculated by known functional relationship.
In the present embodiment, functional relationship is obtained by setting up physical model.Physical model is as follows：
Assume that air is in during vaporizer is flowed through and remove wet condition, outlet air relative humidity is 95%, vaporizer
Surface carries out caloic and exchanges with air.By the air quality conservation before and after vaporizer, preservation of energy is obtained：
Formula (1) is to the moisture row mass-conservation equation in air.By solving above-mentioned equation group, can obtain working as front ring
Border humidity.In the present embodiment, through vaporizer air mass flow maCan be obtained by rotation speed of fan.
Formula (2) is to sensible heat transfer amount row energy conservation equation between the air and evaporator surface through vaporizer.dsFor
The corresponding saturated air water capacity of evaporator surface temperature, can be by evaporator surface temperature TsIt is calculated.
Heat transfer coefficient α through between the air and evaporator surface of vaporizer, mass tranfer coefficient αdObtained by formula (3), (4), (5)
Arrive
K is correction factor, and original formula (can be found in Turaga M, Lin S, Fazio PP.Correlation for
heat transfer and pressure drop factors for direct expansion air cooling and
dehumidifying coils.ASHRAE Transactions 1988；94(2):616 ± 29) it is only applicable to particular geometric knot
The heat exchanger of structure and less reynolds number range, in actual applications, generally require to be modified.Correcting mode to former formula
Including but not limited to corrected with the running status of refrigeration (dehumidifying) equipment.In the present embodiment, using compressor rotary speed and
Rotation speed of fan is modified to former formula.
Under conditions of most of air-conditionings and dehumidifier use, Le 2/31 is approximately equal to, therefore formula (5) can be reduced to
Wherein Cp is the specific heat capacity of humid air, takes 1.01kJ/kg K
In formula (1)～(6), the meaning of each physical quantity is
The heat transfer coefficient of α-through between the air and evaporator surface of vaporizer, kW/m2K
αd- the mass tranfer coefficient through between the air and evaporator surface of vaporizer, kg/m2s
The total heat exchange area of A-vaporizer, m2
Ap- evaporator tubes external surface area, m2
ma- through vaporizer air mass flow, kg/s
The specific heat capacity of Cp-humid air, kJ/kg K.
G-unit area MAF, kg/m2s
Y-evaporator fin thickness, m
Sp- evaporator fin spacing, m
Pra- Prandtl number
Rea- Reynolds number
Le-lewis number
T1,T2- through the temperature of the forward and backward air of vaporizer, DEG C
Ts- evaporator surface temperature, DEG C
d1、d2- through the water capacity of the forward and backward air of vaporizer, kg/kg dry air
d1As current embodiment require that the vaporizer of the air humidity for calculating, summer air-conditioning device or dehumidifier is normally operated in
Under wet cooling condition, evaporator outlet (after vaporizer) relative air humidity is in 95% or so, d2Can be according to through vaporizer
Air humidity afterwards is that 95% this hypothesis is obtained with reference to the air themperature calculating after vaporizer；
dsThe corresponding saturated air water capacity of-evaporator surface temperature, kg/kg dry air
n1、n2- evaporator blowing rotation speed of fan, refrigeration (dehumidifying) device compressor rotating speed, r/min
K-correction factor.
For example：For the vaporizer of a determination, by 6 groups comprising current environment dry-bulb temperature, after vaporizer process
Air dry-bulb temperature and the data of rotation speed of fan substitute into and solve above-mentioned equation and obtain corresponding ambient humidity, with actual measurement
As shown in table 1, for convenience of compareing, the air humidity conversion in table is relative humidity to Comparative result.
Table 1
Embodiment 2
One kind is used for air humidity detection method, comprises the following steps：
Current environment dry-bulb temperature, the air dry-bulb temperature after vaporizer process, evaporation are obtained by temperature sensing device
Device is vaporizer or the vaporizer in dehumidifier in air-conditioner；
Freezed (dehumidifying) equipment running status, refrigeration (dehumidifying) equipment running status include but is not limited to air-conditioner or
Compressor rotary speed or frequency of the pressure fan rotating speed of dehumidifier, air-conditioner or dehumidifier etc..
For the air-conditioner or dehumidifier that determine, measure some groups of data, every group of data include current environment dry-bulb temperature,
Air dry-bulb temperature, refrigeration (dehumidifying) equipment running status and current environment humidity after vaporizer process.This enforcement
In example, refrigeration (dehumidifying) equipment running status select the compressor turn of pressure fan rotating speed and refrigeration (dehumidifying) equipment at vaporizer
Speed；
Set up input and turn for current environment dry-bulb temperature, the air dry-bulb temperature after vaporizer process and pressure fan
Speed, is output as the neutral net of current environment humidity.Include current environment dry-bulb temperature, Jing Guozheng with some groups of data for measuring
Send out the air dry-bulb temperature after device is processed, pressure fan rotating speed, compressor rotary speed and current environment humidity and train above-mentioned nerve
Network；
Will the neutral net that completes of training with functional form output, the function characterize air humidity and environment dry-bulb temperature,
The relation between air dry-bulb temperature, refrigeration (dehumidifying) equipment running status after vaporizer process.
For example：For the air-conditioner of a determination, 80 groups of data are obtained by measurement, every group of data are dry including current environment
Ball temperature, the air dry-bulb temperature after vaporizer process, pressure fan rotating speed, compressor rotary speed and current environment humidity, build
Vertical input layer is current environment dry-bulb temperature, the air dry-bulb temperature after vaporizer process, compressor rotary speed and pressure fan
Rotating speed, output layer is the BP neural network of current environment humidity, and neural network structure is double hidden layers and each hiding node layer
Number is all 6.
The neutral net is trained with 80 groups of above-mentioned data, trains the corresponding function of neutral net for completing to be
Air humidity is characterized with environment dry-bulb temperature, the air dry-bulb temperature after vaporizer process, refrigeration (dehumidifying) equipment operation
The function of the relation between state.
Under the conditions of the present embodiment, 6 groups of data are input into, every group of data are including current environment dry-bulb temperature, through vaporizer
Air dry-bulb temperature, pressure fan rotating speed after process, using the function prediction current environment humidity, this 6 groups of data are not belonging to use
In 80 groups of data of training.The ambient humidity Comparative result corresponding with experiment measurement that predicts the outcome is as shown in table 2：
Table 2
As can be seen from Table 2, the inventive method has very high accuracy of detection to current environment humidity.
Claims (7)
1. a kind of air humidity detection method, it is characterised in that based on operation refrigeration under the present circumstances or dehumidification equipment
Vaporizer is implemented, and specifically includes：
A, the air dry-bulb temperature forward and backward through vaporizer detected respectively under current environment；
B, the running state parameter for obtaining refrigeration or dehumidification equipment,
C, the relational model for obtaining parameter according to air humidity under current environment and step a and step b are calculated and work as front ring
Air humidity under border.
2. air humidity detection method as claimed in claim 1, it is characterised in that the operation shape of the refrigeration or dehumidification equipment
State parameter includes：
The pressure fan rotating speed of refrigeration plant or dehumidification equipment at vaporizer；And
The working conditions of compressor of refrigeration plant or dehumidification equipment.
3. air humidity detection method as claimed in claim 1, it is characterised in that the relational model be based on each parameter it
Between physical relation mathematical model, or based on data with existing training obtained by mathematical model.
4. air humidity detection method as claimed in claim 3, it is characterised in that described based on obtained by data with existing training
Mathematical model is neural network model, and it obtains parameter as input with step a and step b, with air humidity under current environment
For output.
5. air humidity detection method as claimed in claim 4, it is characterised in that the structure of the neural network model is double
Hidden layer, and each hidden layer nodes is 6.More accurate result can be obtained under suitable amount of calculation.
6. air humidity detection method as claimed in claim 3, it is characterised in that described based on physical relation between each parameter
Mathematical model be：
maIt is the mass flow of the air through vaporizer, is obtained by pressure fan rotating speed；
d1、d2It is through the forward and backward air humidity of vaporizer, wherein d1For value to be calculated, d2Take approximation；
α is the heat transfer coefficient through between the air and evaporator surface of vaporizer；
αdIt is the mass tranfer coefficient through between the air and evaporator surface of vaporizer；
A is the total heat exchange area of vaporizer；
dsFor the corresponding saturated air water capacity of evaporator surface temperature；
CpFor the specific heat capacity of humid air；
TsFor evaporator surface temperature；
T1、T2It is through the forward and backward air themperature of vaporizer.
7. air humidity detection method as claimed in claim 1, it is characterised in that under the current environment through vaporizer
Respectively by being arranged on, the temperature sensing device at evaporator air side entrance and exit is measured forward and backward air dry-bulb temperature.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108490117A (en) * | 2018-02-09 | 2018-09-04 | 青岛海尔智能技术研发有限公司 | Oven moisture measurement, control method and oven |
| CN113551401A (en) * | 2021-07-19 | 2021-10-26 | 珠海格力电器股份有限公司 | Temperature and humidity detection device and method and evaporative refrigeration equipment |
| CN114087711A (en) * | 2021-11-12 | 2022-02-25 | 珠海格力电器股份有限公司 | Method and device for predicting environment humidity and semiconductor dehumidifier |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108490117A (en) * | 2018-02-09 | 2018-09-04 | 青岛海尔智能技术研发有限公司 | Oven moisture measurement, control method and oven |
| CN113551401A (en) * | 2021-07-19 | 2021-10-26 | 珠海格力电器股份有限公司 | Temperature and humidity detection device and method and evaporative refrigeration equipment |
| CN113551401B (en) * | 2021-07-19 | 2022-06-14 | 珠海格力电器股份有限公司 | Temperature and humidity detection device and method and evaporative refrigeration equipment |
| CN114087711A (en) * | 2021-11-12 | 2022-02-25 | 珠海格力电器股份有限公司 | Method and device for predicting environment humidity and semiconductor dehumidifier |
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