CN113568445B - Device and method for controlling condensation point of scanning head of three-dimensional scanning type wind-measuring laser radar - Google Patents
Device and method for controlling condensation point of scanning head of three-dimensional scanning type wind-measuring laser radar Download PDFInfo
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D22/00—Control of humidity
- G05D22/02—Control of humidity characterised by the use of electric means
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/48—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S17/00
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02A90/10—Information and communication technologies [ICT] supporting adaptation to climate change, e.g. for weather forecasting or climate simulation
Abstract
The invention provides a three-dimensional scanning type wind-measuring laser radar scanning head dew point control device, which comprises a controller main board, a thermistor, a humidity sensor and a pressure sensor, wherein the controller main board is connected with the thermistor; the controller main board is used for collecting signals measured with the outside and processing algorithms; the humidity sensor is used for collecting humidity signals, and is electrically connected with the controller main board and used for transmitting the signals; the pressure sensor is used for collecting pressure signals, and is electrically connected with the controller main board and used for transmitting signals; the thermistor is arranged into a multi-path resistor structure and is used for measuring the temperatures of a plurality of temperature points, and is electrically connected with the controller main board and used for signal transmission. Meanwhile, the method for using the device is also provided, cold air and hot air are provided by an environmental temperature control mode of adding the TEC temperature controller to the fan, and the temperature of the air in the scanning head is controlled by an air circulation mode, so that the whole environmental temperature in the scanning head can be effectively maintained, and the temperature of a single part is not the temperature of the whole part.
Description
Technical Field
The invention belongs to the technical field of three-dimensional scanning type wind lidar, and particularly relates to a device and a method for controlling condensation point of a scanning head of the three-dimensional scanning type wind lidar.
Background
The three-dimensional scanning wind-measuring laser radar detects an aerosol backward scattering signal in the atmosphere according to a coherent Doppler wind-measuring principle, so that speed dividing information is obtained, an object which has influence on a light path cannot exist in a transmitting path of detection light and a receiving path of reflected light, if the whole light path is shielded, the signal-to-noise ratio of detection is reduced, and the speed dividing data processing of the radar is distorted or abnormal. As the three-dimensional scanning wind-measuring laser radar is increasingly widely applied in the fields of urban meteorological detection, wind power resource evaluation, local wind trimming early warning and the like, in order to reduce equipment maintenance and achieve the unattended purpose, the non-shielding of a detection light path becomes a first hard requirement for guaranteeing the operation of the radar.
In the whole optical path, the space where dew condensation is most likely to occur is the inside of the scanning head. Because the radar is operated outdoors, due to uncertainty of outdoor conditions, sudden drop of air temperature or sudden increase of water vapor in the air often occurs, and even if the environmental conditions are good, part of water vapor enters the inside of the scanning head. In the operation process of the radar, a large amount of heat is generated in the radar, and after the temperature of the external environment is low and a scanning head enters a large amount of water vapor, the condensation phenomenon is generated.
In addition, the inside humidity of scanning head is too big, can lead to the inside ponding of scanning head and window mirror inside dewfall to can't be with the complete emission of probe beam, also can reduce the performance of surveying.
At present, a plurality of radars with scanning heads are provided with drying agents or humidity control sheets which are placed inside, and each time the scanning heads are covered with a dried drying agent and a dried humidity control sheet, the cover is immediately closed, and excessive water vapor is prevented from entering. And under the low temperature condition, the working performance of the scanner is also affected, and a heating plate is also required to be provided for heating the inner wall of the scanner, so that the performance of the scanner is ensured.
The existing conventional specific method is as follows: before the scanning head is covered, the drying agent and the humidity control sheet are placed in the drying box, the drying box is immediately taken out after half an hour of drying, the control sheet is stuck in the scanning head, and the drying agent is fixed at a position where the drying agent does not shade the light beam by using 704 solid glue. Immediately capping the scan head and ensuring that the scan head is in the fixed position for about 2 hours without rotation. Or a heating plate is installed on the inner wall for heating control under the low temperature condition before the assembly of the scanning head.
When the method for installing and placing the drying agent and the control sheet is adopted, the problem of dew condensation inside the scanning head can be solved, but the method has the following defects:
1. the time for installing the scanning head is too long and tedious
Before the scanning head is capped, most of the drying agent and the control piece are required to be fixed, and the period cannot be interrupted, otherwise, the dehumidification effect of the drying agent cannot be ensured. And meanwhile, the solid glue for fixing the drying agent is longer in curing time, so that the assembly time is prolonged.
2. Limited life and need to be replaced periodically
Because the mechanical structure of the scanning head can not guarantee the air tightness of a hundred percent, water vapor permeates into the scanning head, and after the water vapor absorbed by the drying agent reaches a certain degree, the water vapor can not be continuously absorbed, and the condensation still can be caused for a long time, so that the drying agent is necessary to be replaced periodically.
3. Heating plate lamination
Because there is reasons such as processing defect in the scanning head inner wall, the heating plate can exist the laminating inhomogeneous condition, if inhomogeneous too big, can lead to the heating plate to damage, can not work.
Disclosure of Invention
The technical scheme is as follows: in order to prevent condensation inside the radar scanning head, a condensation point control device is arranged inside the scanning head of the three-dimensional scanning laser radar, and the condensation phenomenon is prevented from occurring inside the scanning head by changing the temperature and humidity of the internal environment. And the scanner can cause performance degradation when running under low temperature condition, and can not guarantee rotation precision, the invention provides a three-dimensional scanning wind-measuring laser radar scanning head dew point control device, in particular to a three-dimensional scanning wind-measuring laser radar scanning head dew point control device
The intelligent controller comprises a controller main board, a thermistor, a humidity sensor and a pressure sensor; the controller main board is used for collecting signals measured with the outside and processing algorithms; the humidity sensor is used for collecting humidity signals, and is electrically connected with the controller main board and used for transmitting the signals; the pressure sensor is used for collecting pressure signals, and is electrically connected with the controller main board and used for transmitting signals; the thermistor is arranged into a multi-path resistor structure and is used for measuring the temperatures of a plurality of temperature points, and is electrically connected with the controller main board and used for signal transmission.
As improvement, the device also comprises a dehumidifier, a fan and a TEC temperature controller; the dehumidifier is connected with the controller main board and is used for receiving signals and carrying out internal water vapor handling treatment; the TEC temperature controller is arranged on the surface of the fan and is used for being matched with the fan to provide refrigeration or heating treatment; the fan is connected with the controller main board and used for carrying out wind supply processing after receiving signals.
As an improvement, when the controller main board performs algorithm processing, the dew point humidity in the environment temperature in the scanning head is obtained by collecting a plurality of groups of temperature values in the scanning head, and then a working signal is sent.
As a modification, when the algorithm is processed, the following formula (1) is adopted:
in the formula (1), the value of Td is obtained by comparing the temperature of the window mirror with the temperature of the inner wall of the scanning head, taking two small temperature values as calculated values, wherein the value of T represents the ambient temperature, and a and b are correction numerical parameters.
As an improvement, when Td satisfies (0, t), the dew point humidity is obtained according to formula (1), and then compared with the current humidity, a difference is calculated, and if the humidity difference is smaller than the maximum refrigeration threshold, a signal for starting the fan and the TEC temperature controller in a refrigeration state is sent;
if the fan and the temperature control TEC are started for a long time, the humidity difference value is still smaller than the refrigerating highest threshold value, and when the temperature difference value approaches the refrigerating lowest threshold value, a dehumidifier is started to dehumidify the internal humidity, and the internal humidity processing signal is directly reduced.
As an improvement, when Td is smaller than 0, the condensation point is not calculated by the formula (1), and if the Td temperature is detected to be smaller than the heating minimum threshold value, the fan and the TEC temperature controller are started to be in a heating state for signal processing; and if the Td temperature is detected to be smaller than the heating highest threshold value, sending out signal processing for stopping the fan and the TEC temperature controller in a heating state.
As an improvement, when Td satisfies the requirement of being greater than T, the condensation point calculation is not performed by the formula (1), and at this time, signals of the off state of the fan, the TEC thermostat and the dehumidifier are sent out.
In addition, the method for controlling the dew point of the three-dimensional scanning type wind-measuring laser radar scanning head is provided, and comprises the following specific steps of
(1) Preparation work
Powering up the whole control device, and carrying out signal acquisition work by the humidity sensor and the pressure sensor to read signals including but not limited to multipath temperature values, humidity values and pressure values;
(2) Data processing and sending out working signals
Comparing the temperature of the window mirror with the temperature of the inner wall of the scanning head, taking two small temperature values as Td calculation values to obtain the humidity of the condensation point, comparing the humidity with the current humidity value according to the mode that Td meets three intervals of less than 0, more than T and (0, T), and sending out corresponding working signals;
(3) End of work
After receiving the corresponding signals, the fan, the TEC temperature controller and the dehumidifier work until the end signal is received to complete the working cycle.
In the step (2), when Td meets (0, T), the humidity of the condensation point is obtained according to the formula (1), and then compared with the current humidity, a difference value is calculated, and if the humidity difference value is smaller than the maximum refrigerating threshold value, a signal for starting a fan and a TEC temperature controller to be in a refrigerating state is sent;
if the fan and the temperature control TEC are started for a long time, the humidity difference value is still smaller than the refrigerating highest threshold value, and when the temperature difference value approaches the refrigerating lowest threshold value, a dehumidifier is started to dehumidify the internal humidity, and the internal humidity processing signal is directly reduced.
As an improvement, in the step (2),
when the Td is smaller than 0, the condensation point is not calculated through the formula (1), and if the Td temperature is detected to be smaller than the heating minimum threshold value, a signal process of starting the fan and the TEC temperature controller to be in a heating state is sent out; if the Td temperature is detected to be smaller than the heating highest threshold value, sending out a signal for stopping the fan and the TEC temperature controller to be in a heating state;
when Td is greater than T, the dew point calculation is not performed through the formula (1), and signals of the closing states of the fan, the TEC temperature controller and the dehumidifier are sent out.
The beneficial effects are that: compared with the conventional device and method, the device and method provided by the invention have the following specific advantages:
(1) The dew point control device is simple and quick to install, can be directly fixed by screws, and does not need long-time adhesion and complex procedures like a drying agent.
(2) After the dew point humidity algorithm is added, the dew point humidity is compared with the current internal humidity through calculation according to control logic at different temperatures, so that the dew point control is realized, the problem of excessive control of a dehumidifier can be effectively avoided, the service life of the dehumidifier is prolonged, the environmental temperature control mode of a fan and a TEC temperature controller is increased, cold air and hot air are provided, the temperature control is carried out on the air in the scanning head in an air circulation mode, and the internal integral environmental temperature can be effectively maintained instead of the temperature of a single part.
Drawings
Fig. 1 is a schematic structural diagram of a laser radar scanning head according to the present invention, wherein the left side is a left view, and the right side is a right view.
Fig. 2 is a schematic diagram of a scanning head dew point control device according to the present invention.
Fig. 3 is a flowchart of a method of the condensation point control apparatus in embodiment 1 of the present invention.
Wherein in fig. 3: hum_com represents the current humidity value of the dew point, and hum_value represents the measured humidity value.
Detailed Description
The following describes the embodiments of the present invention in further detail with reference to examples. The following examples are illustrative of the invention and are not intended to limit the scope of the invention.
The three-dimensional scanning wind-measuring laser radar comprises a scanning head, two transmission mechanisms, a window mirror and a turntable, wherein the two transmission mechanisms are an X-axis motion mechanism and a Z-axis motion mechanism, and the two transmission mechanisms comprise a scanning motor and a rear cover plate which are independent, namely a Z-axis scanning motor, an X-axis scanning motor, a Z-axis rear cover plate and an X-axis rear cover plate. The rear cover plates of the two shafts are fixed by fixing pieces, such as screws, and sealing rubber strips are arranged on the periphery of the rear cover plates for preventing the scanning head from being water. The detection light is reflected through the mirror surface inside the scanning head, so that the wind speed detection of radar at different angles is realized, and the condensation point control device is arranged inside the turntable, so that the space of the turntable is large enough, and the detection light path is not blocked.
The three-dimensional scanning type wind-measuring laser radar scanning head dew point control device comprises a controller main board, a thermistor, a humidity sensor and a pressure sensor; the controller main board is used for collecting signals measured with the outside and processing algorithms; the humidity sensor is used for collecting humidity signals, and is electrically connected with the controller main board and used for transmitting the signals; the pressure sensor is used for collecting pressure signals, and is electrically connected with the controller main board and used for transmitting signals; the thermistor is arranged into a multi-path resistor structure and is used for measuring the temperatures of a plurality of temperature points, and is electrically connected with the controller main board and used for signal transmission.
The device also comprises a dehumidifier, a fan and a TEC temperature controller; the dehumidifier is connected with the controller main board and is used for receiving signals and carrying out internal water vapor handling treatment; the TEC temperature controller is arranged on the surface of the fan and is used for being matched with the fan to provide refrigeration or heating treatment; the fan is connected with the controller main board and used for carrying out wind supply processing after receiving signals.
When the controller main board performs algorithm processing, the dew point humidity in the environment temperature in the scanning head is obtained by collecting a plurality of groups of temperature values in the scanning head, and then a working signal is sent.
During algorithm processing, the following formula (1) is adopted:
in the formula (1), the value of Td is obtained by comparing the temperature of the window mirror with the temperature of the inner wall of the scanning head, taking two small temperature values as calculated values, wherein the value of T represents the ambient temperature, and a and b are correction numerical parameters.
When Td meets (0, T), obtaining the humidity of the condensation point according to the formula (1), comparing the humidity with the current humidity, calculating a difference value, and if the humidity difference value is smaller than a refrigerating highest threshold value, sending out a signal for starting a fan and a TEC temperature controller to be in a refrigerating state;
if the fan and the temperature control TEC are started for a long time, the humidity difference value is still smaller than the refrigerating highest threshold value, and when the temperature difference value approaches the refrigerating lowest threshold value, a dehumidifier is started to dehumidify the internal humidity, and the internal humidity processing signal is directly reduced.
When the Td is smaller than 0, the condensation point is not calculated through the formula (1), and if the Td temperature is detected to be smaller than the heating minimum threshold value, a signal process of starting the fan and the TEC temperature controller to be in a heating state is sent out; and if the Td temperature is detected to be smaller than the heating highest threshold value, sending out signal processing for stopping the fan and the TEC temperature controller in a heating state.
When Td is greater than T, the dew point calculation is not performed through the formula (1), and signals of the closing states of the fan, the TEC temperature controller and the dehumidifier are sent out.
The method of the condensation point control device of the three-dimensional scanning type wind-measuring laser radar scanning head comprises the following specific steps of
(1) Preparation work
Powering up the whole control device, and carrying out signal acquisition work by the humidity sensor and the pressure sensor to read signals including but not limited to multipath temperature values, humidity values and pressure values;
(2) Data processing and sending out working signals
Comparing the temperature of the window mirror with the temperature of the inner wall of the scanning head, taking two small temperature values as Td calculation values to obtain the humidity of the condensation point, comparing the humidity with the current humidity value according to the mode that Td meets three intervals of less than 0, more than T and (0, T), and sending out corresponding working signals;
(3) End of work
After receiving the corresponding signals, the fan, the TEC temperature controller and the dehumidifier work until the end signal is received to complete the working cycle.
The method is characterized in that: in the step (2), when Td meets (0, T), the humidity of the condensation point is obtained according to the formula (1), and then compared with the current humidity, a difference value is calculated, and if the humidity difference value is smaller than the refrigerating highest threshold value, a signal for starting a fan and a TEC temperature controller to be in a refrigerating state is sent out;
if the fan and the temperature control TEC are started for a long time, the humidity difference value is still smaller than the refrigerating highest threshold value, and when the temperature difference value approaches the refrigerating lowest threshold value, a dehumidifier is started to dehumidify the internal humidity, and the internal humidity processing signal is directly reduced.
In the step (2), the step of (C),
when the Td is smaller than 0, the condensation point is not calculated through the formula (1), and if the Td temperature is detected to be smaller than the heating minimum threshold value, a signal process of starting the fan and the TEC temperature controller to be in a heating state is sent out; if the Td temperature is detected to be smaller than the heating highest threshold value, sending out a signal for stopping the fan and the TEC temperature controller to be in a heating state;
when Td is greater than T, the dew point calculation is not performed through the formula (1), and signals of the closing states of the fan, the TEC temperature controller and the dehumidifier are sent out.
Example 1
As a specific embodiment of the present invention, humidity sensors and pressure sensors are selected as BMP388 and HDC1080, and optionally mounted on a controller board for measuring humidity and pressure.
The controller main board is used for controlling peripheral equipment, collecting signals and carrying out algorithm processing, and obtaining an optimal control mode after the algorithm processing according to information of an external sensor. Wherein the control of the peripheral equipment comprises the control of a dehumidifier, a fan and a TEC temperature controller.
The dehumidifier is used for the inside steam transport work, and TEC temperature controller selectively laminates on the fin of fan to provide cold wind and hot-blast for refrigeration and heating.
The thermistor is selected as a three-way thermistor in the embodiment and is used for measuring the temperature of each temperature point, and the temperature points are respectively arranged around the window mirror, the inner wall of the scanning head and the non-light path space in the scanning head. The collection of temperature provides effective support for control of the junction point.
As another specific embodiment of the present invention, in the formula 1, the value of a is set to 17.27, the value of b is set to 237.7, the maximum refrigerating threshold is set to 8-10%, the minimum refrigerating threshold is set to 3-5%, the maximum heating threshold is set to-5 ℃ and the minimum heating threshold is set to-10 ℃, and at this time, the control signals sent for three different temperature intervals are as follows:
1、Td＜0
in this section, dew point calculation is not performed by the formula of dew point. In the current state, when the Td temperature is detected to be less than minus 10 ℃, the fan and the temperature control TEC are started to be in a heating state. The stability of the scanning head can be reduced under the low-temperature condition, so that the internal temperature is increased by heating the hot air, the working stability of the scanning head is improved, and when the temperature reaches-5 ℃, the heating is stopped, and the fan and the temperature control TEC are turned off.
2、0＜Td＜T
In the interval, after the dew point humidity is calculated through a dew point formula, the difference value between the current humidity and the dew point humidity is calculated, if the humidity difference value is smaller than 10%, the fan and the temperature control TEC are immediately started to be in a refrigerating state, the environment temperature is immediately reduced, the difference value between Td and T is reduced, and the dew point value is improved.
If the fan and the temperature control TEC are started for a long time, the humidity difference is still smaller than 10%, and when the humidity difference approaches 5%, the dehumidifier is started to dehumidify the internal humidity, and the internal humidity is directly reduced.
Because the dehumidifier has a certain service life and can not work for a long time, the control mode effectively reduces the use time of the dehumidifier and ensures the service life of the dehumidifier.
3、Td>T
In the interval, the scanning head can not form a dew phenomenon, and the fan, the temperature control TEC and the dehumidifier are all in a closed state.
The device reduces the difficulty of assembling the scanning head and shortens the installation time. Through the inside air circulation, the refrigeration and the heating of internal environment temperature are effectively realized, so that the temperature inside the whole scanning head is relatively balanced, and the running performance of the scanning head is ensured.
Through the monitoring of various sensors, the principle of condensation and the humidity threshold of condensation are combined, different control requirements are met, and the fact that condensation is not caused inside the scanning head is ensured.
The above examples illustrate only a few embodiments of the invention, which are described in detail and are not to be construed as limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention. Accordingly, the scope of protection of the present invention is to be determined by the appended claims.
Claims (4)
1. The utility model provides a three-dimensional scanning formula wind lidar scanning head dew point controlling means which characterized in that: the intelligent controller comprises a controller main board, a thermistor, a humidity sensor and a pressure sensor; the controller main board is used for collecting signals measured with the outside and processing algorithms; the humidity sensor is used for collecting humidity signals, and is electrically connected with the controller main board and used for transmitting the signals; the pressure sensor is used for collecting pressure signals, and is electrically connected with the controller main board and used for transmitting signals; the thermistor is arranged in a multi-path resistor structure and is used for measuring the temperatures of a plurality of temperature points, and is electrically connected with the controller main board and used for transmitting signals;
when the controller main board performs algorithm processing, a plurality of groups of temperature values in the scanning head are collected, the dew point humidity in the environment temperature in the scanning head is obtained through calculation, and then a working signal is sent out;
during algorithm processing, the following formula (1) is adopted:
wherein in formula (1), T d The value of (a) is that the temperature of the window mirror is compared with the temperature of the inner wall of the scanning head, two small temperature values are taken as calculated values, the value of T represents the ambient temperature, and a and b are correction numerical parameters;
the device also comprises a dehumidifier, a fan and a TEC temperature controller;
when T is d Satisfy (0, T)) When the humidity of the condensation point is obtained according to the formula (1), the humidity is compared with the current humidity, a difference value is calculated, and if the humidity difference value is smaller than the refrigerating highest threshold value, a signal for starting the fan and the TEC temperature controller to be in a refrigerating state is sent out;
if the fan and the temperature control TEC are started for a long time, the humidity difference value is still smaller than the refrigerating highest threshold value and is close to the refrigerating lowest threshold value, a dehumidifier is started to dehumidify the internal humidity, and the internal humidity processing signal is directly reduced;
when T is d If the temperature is less than the heating minimum threshold, sending out signal processing for starting a fan and a TEC temperature controller to be in a heating state; if the Td temperature is detected to be smaller than the heating highest threshold value, sending out a signal for stopping the fan and the TEC temperature controller to be in a heating state;
when T is d When the temperature is more than T, the dew point calculation is not carried out through the formula (1), and signals of the closing states of the fan, the TEC temperature controller and the dehumidifier are sent out at the moment.
2. The three-dimensional scanning type wind-finding laser radar scanning head dew point control device according to claim 1, wherein: the dehumidifier is connected with the controller main board and is used for receiving signals and carrying out internal water vapor handling treatment; the TEC temperature controller is arranged on the surface of the fan and is used for being matched with the fan to provide refrigeration or heating treatment; the fan is connected with the controller main board and used for carrying out wind supply processing after receiving signals.
3. A method of the three-dimensional scanning wind lidar scanning head dew point control device according to claim 1 or 2, characterized in that: the method comprises the following specific steps of
(1) Preparation work
Powering up the whole control device, and carrying out signal acquisition work by the humidity sensor and the pressure sensor to read signals including but not limited to multipath temperature values, humidity values and pressure values;
(2) Data processing and sending out working signals
Comparing the temperature of the window mirror with the temperature of the inner wall of the scanning head, taking two small temperature values as Td calculation values to obtain the humidity of the condensation point, comparing the humidity with the current humidity value according to the mode that Td meets three intervals of less than 0, more than T and (0, T), and sending out corresponding working signals;
when T is d When (0, T) is met, the humidity of the condensation point is obtained according to the formula (1), then the humidity is compared with the current humidity, a difference value is calculated, and if the humidity difference value is smaller than the refrigerating highest threshold value, a signal for starting a fan and a TEC temperature controller to be in a refrigerating state is sent out;
if the fan and the temperature control TEC are started for a long time, the humidity difference value is still smaller than the refrigerating highest threshold value and is close to the refrigerating lowest threshold value, a dehumidifier is started to dehumidify the internal humidity, and the internal humidity processing signal is directly reduced;
(3) End of work
After receiving the corresponding signals, the fan, the TEC temperature controller and the dehumidifier work until the end signal is received to complete the working cycle.
4. The method of the three-dimensional scanning wind-finding laser radar scanning head dew point control device according to claim 3, wherein the method comprises the following steps: in the step (2), the step of (C),
when T is d If the temperature is less than the heating minimum threshold, sending out signal processing for starting a fan and a TEC temperature controller to be in a heating state; if the Td temperature is detected to be smaller than the heating highest threshold value, sending out a signal for stopping the fan and the TEC temperature controller to be in a heating state;
when T is d When the temperature is more than T, the dew point calculation is not carried out through the formula (1), and signals of the closing states of the fan, the TEC temperature controller and the dehumidifier are sent out at the moment.
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| 许武毅.Low-E节能玻璃应用技术问答.北京：中国建材工业出版社,2016,第81-85页. * |
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