CN111443107A - Temperature and humidity measuring device and measuring method - Google Patents
Temperature and humidity measuring device and measuring method Download PDFInfo
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- CN111443107A CN111443107A CN202010401798.6A CN202010401798A CN111443107A CN 111443107 A CN111443107 A CN 111443107A CN 202010401798 A CN202010401798 A CN 202010401798A CN 111443107 A CN111443107 A CN 111443107A
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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
- G01N25/66—Investigating or analyzing materials by the use of thermal means by investigating moisture content by investigating dew-point
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D21/00—Measuring or testing not otherwise provided for
- G01D21/02—Measuring two or more variables by means not covered by a single other subclass
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K7/00—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements
- G01K7/16—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using resistive elements
- G01K7/18—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using resistive elements the element being a linear resistance, e.g. platinum resistance thermometer
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Abstract
The invention discloses a temperature and humidity measuring device, which is used for measuring the temperature and humidity of an air dry bulb and comprises a heat-insulating and moisture-insulating shell, a temperature-sensing sensor and a temperature-sensing sensor, wherein the heat-insulating and moisture-sensing shell is used for allowing measured air to pass through; the temperature sensor is fixed in the heat-insulation and moisture-insulation shell, and is close to one end of the heat-insulation and moisture-insulation shell where the air to be measured enters, and the surface of the temperature sensor is a smooth surface; the heater is fixed in the heat-insulating and moisture-insulating shell behind the temperature sensor; the mixer is fixed in a heat-insulating and moisture-insulating shell behind the heater and is used for improving the uniformity of the temperature of the air dry balls; the dew point temperature sensor is fixed in a heat-insulating and moisture-insulating shell behind the mixer and is used for obtaining the dew point temperature; the sampling fan is fixed at the other port of the heat-preservation and moisture-insulation shell behind the dew point temperature sensor. The invention also discloses a temperature and humidity measuring device. The invention can avoid sensor failure/inaccurate temperature and humidity measurement caused by low-temperature and high-humidity environment frost and fog.
Description
Technical Field
The invention relates to temperature and humidity measurement, in particular to a temperature and humidity measurement device for a low-temperature high-humidity environment. The invention also relates to a temperature and humidity measurement method for the low-temperature high-humidity environment.
Background
In the field of air conditioner manufacturing for home, commercial and automobile, some manufacturers are concerned more and more about the performance of the air conditioner heat pump during operation, and even research the performance under extreme weather conditions. The low-temperature high-humidity environment is the most frosting condition of the air heat pump, and the research on the frosting performance of the air heat pump is regarded by many manufacturers.
When the temperature of the air dry bulb is higher than 0 ℃, the saturated relative humidity can reach 100 percent RH; when the temperature of the air dry bulb is less than or equal to 0 ℃, the saturated relative humidity is less than 100 percent RH. When the frost point temperature of the air is equal to the dry bulb temperature, the water vapor begins to freeze (also called air ice saturation), and the relative humidity of the air reaches the extreme value at the dry bulb temperature. When the air enters the ice saturation state, the humidity sensor which is conventionally purchased in the market can not measure the air. At this time, the diffused frost in the air is accumulated on the protective cover of the probe of the sensor, resulting in the failure of the sensor. In this case, even if a humidity probe with a built-in heating device is used, frost cannot be prevented from accumulating on the protective cover; a humidity sensor with a hot air defrosting device is required. The heating of the humidity sensor with the hot air dew and frost removal function on the market is automatically controlled, and during heating, the humidity sensor fails to measure until the frost is removed completely. When the sensor fails, the conventional practice is to keep the sensor reading before heating is initiated, and the control system will also maintain the output of the humidifier. The control algorithm has certain effect on the environment that the working condition is far away from the air saturated by the ice surface and frost fog is occasionally generated in the air. However, for conditions close to ice saturation, frost and fog are frequently generated in the air, and the heating device in the sensor is frequently operated, which results in significant fluctuations in the humidity of the environmental chamber. For this reason, the problem of measuring humidity needs to be solved first.
When the operating mode is close to ice saturation (operating mode and saturation point's relative humidity deviation is at 0 ~ 5% RH), because the reason of air temperature and humidity field homogeneity, in humidification section low reaches, a large amount of water smoke or frost fog can appear in the air usually, and these frost fog not only influence humidity and measure, still can cause the indoor a large amount of frost fog that appears of environment, lead to the long-time overshoot of relative humidity, still can accumulate on the coil pipe in a large number even, lead to the air-cooler to stop work very fast. Therefore, in order to improve the control quality and prolong the working time of the air cooler, the accuracy and the failure of the humidity measurement should be ensured firstly.
Disclosure of Invention
In this summary, a series of simplified form concepts are introduced that are simplifications of the prior art in this field, which will be described in further detail in the detailed description. This summary of the invention is not intended to identify key features or essential features of the claimed subject matter, nor is it intended to be used as an aid in determining the scope of the claimed subject matter.
The invention aims to solve the technical problem of providing a temperature and humidity measuring device which can avoid sensor failure caused by low-temperature and high-humidity environment frost and fog.
The invention aims to solve another technical problem of providing a temperature and humidity measurement method which can avoid inaccurate temperature and humidity measurement caused by low-temperature and high-humidity environment frost fog.
The low-temperature high-humidity environment means that the temperature of the air dry bulb is less than or equal to 0 ℃, and the relative humidity deviation of the air relative humidity and the ice surface saturation state corresponding to the temperature of the air dry bulb is less than or equal to 5% RH.
In order to solve the above technical problems, the present invention provides a temperature and humidity measuring device for measuring temperature and humidity of an air dry bulb, comprising:
the heat-insulating and moisture-insulating shell is used for the tested air to pass through; the pipeline between the heater and the dew point temperature sensor is insulated, so that the reduction of relative humidity and the deterioration of temperature uniformity are avoided;
the temperature sensor is fixed in the heat-insulation and moisture-insulation shell, is close to one end of the heat-insulation and moisture-insulation shell where the air to be detected enters, and has a smooth surface;
alternatively, the measured air flow velocity through the temperature sensor is a, a is more than or equal to 3m/s, and frost fog cannot be accumulated on the platinum resistor surface with smoothness (the smoothness refers to that the surface roughness is equal to or less than 3.2 mu m) because of certain flow velocity of the measured air.
Alternatively, a platinum resistor is used as the temperature sensor.
The heater is fixed in the heat-preservation and moisture-insulation shell behind the temperature sensor;
alternatively, the amount of heat applied by the heater is controlled to reduce the relative humidity of the dried spheres by 5% RH to 15% RH, preferably by 10% RH.
The mixer is fixed in the heat-preservation and moisture-insulation shell behind the heater and is used for improving the uniformity of the temperature of the air dry bulb;
optionally, the mixer makes the temperature uniformity of the air dry balls better than 0.1 ℃, i.e. the temperature difference between the air dry balls is less than 0.1 ℃.
The dew point temperature sensor is fixed in a heat-insulating and moisture-insulating shell behind the mixer and used for obtaining the temperature and calculating the relative humidity to obtain the dew point temperature;
optionally, the measurement accuracy of the temperature sensor in the dew point temperature sensor is better than ± 0.1 ℃, that is, the measurement error is less than ± 0.1 ℃, and the measurement accuracy of the relative humidity sensor is better than ± 2% RH, that is, the measurement error is less than ± 2% RH.
And the sampling fan is fixed at the other port of the heat-preservation and moisture-insulation shell behind the dew point temperature sensor.
The invention provides a temperature and humidity measurement method for measuring the temperature and humidity of an air dry bulb, which comprises the following steps:
s1, measuring the temperature of the measured air at a preset flow rate to obtain a first measured temperature, namely the final temperature obtained by measurement;
optionally, the preset flow rate is a, and a is more than or equal to 3 m/s.
S2, heating the air to be detected, and reducing the relative humidity of the air to be detected;
optionally, the relative humidity of the air to be measured is reduced by 5% RH to 15% RH, preferably by 10% RH;
s3, improving the temperature uniformity of the detected air dry bulb;
optionally, the temperature uniformity of the measured air dry spheres is improved to be better than 0.1 ℃, namely the temperature difference between the air dry spheres is less than 0.1 ℃.
S4, measuring the temperature and the relative humidity of the measured air dry bulb, and calculating to obtain the dew point temperature;
optionally, the measurement accuracy of the temperature is better than +/-0.1 ℃, and the measurement accuracy of the relative humidity is better than +/-2% RH.
And S5, calculating the initial relative humidity of the measured air according to the dew point temperature and the first measured temperature, and taking the initial relative humidity as the humidity obtained by the measuring device.
According to the temperature and humidity measuring device disclosed by the invention, measured air firstly passes through the temperature sensor, then passes through 1 heater, then passes through 1 mixer, then passes through 1 dew point temperature sensor and then passes through 1 fan. The air firstly passes through a smooth platinum resistor, frost mist cannot be accumulated on the surface of the smooth platinum resistor due to the fact that the air flow has a certain flow rate (more than or equal to 3m/s), then the air passes through a heater, the relative humidity of the air is reduced, the heating quantity is controlled to reduce the relative humidity by about 10% RH, then the air passes through a mixer, the uniformity of the air dry bulb temperature is better than 0.1 ℃, then the dew point temperature is obtained through calculation by measuring the dry bulb temperature and the relative humidity, and then the relative humidity of an inlet and an outlet is calculated through the calculated dew point temperature and an inlet temperature sensor. By adopting the temperature and humidity measuring device, under the low-temperature and high-humidity environment, when the precision of the dry-bulb temperature sensor is better than +/-0.1 ℃ and the precision of the relative humidity sensor is better than +/-2% RH, the calculated relative humidity precision is better than +/-3% RH (namely the measurement error is less than +/-3% RH). The invention not only avoids the influence of frost and fog on the sensor, but also has higher temperature and humidity measurement accuracy.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention, are incorporated in and constitute a part of this specification. The drawings are not necessarily to scale, however, and may not be intended to accurately reflect the precise structural or performance characteristics of any given embodiment, and should not be construed as limiting or restricting the scope of values or properties encompassed by exemplary embodiments in accordance with the invention. The invention will be described in further detail with reference to the following detailed description and accompanying drawings:
fig. 1 is a schematic structural diagram of the temperature and humidity measuring device of the present invention.
Fig. 2 is a schematic flow chart of the temperature and humidity measurement method of the present invention.
Description of the reference numerals
Heat-insulating and moisture-insulating shell 1
Dew point temperature sensor 5
A sampling fan 6.
Detailed Description
The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and technical effects of the present invention will be fully apparent to those skilled in the art from the disclosure in the specification. The invention is capable of other embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the general spirit of the invention. It is to be noted that the features in the following embodiments and examples may be combined with each other without conflict. The following exemplary embodiments of the present invention may be embodied in many different forms and should not be construed as limited to the specific embodiments set forth herein. It is to be understood that these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the technical solutions of these exemplary embodiments to those skilled in the art. It will be understood that when an element is referred to as being "connected" or "coupled" to another element, it can be directly connected or coupled to the other element or intervening elements may be present. In contrast, when an element is referred to as being "directly connected" or "directly coupled" to another element, there are no intervening elements present. Like reference numerals refer to like elements throughout the drawings.
A first embodiment, as shown in fig. 1, in which an arrow indicates a flowing direction of air to be measured, provides a temperature and humidity measuring apparatus for measuring temperature and humidity of an air dry bulb, including:
the heat-insulating and moisture-insulating shell 1 is used for allowing air to be measured to pass through; the shape of the shell is not limited, and the shell can be manufactured according to actual conditions, but should be made of heat-insulating and moisture-insulating materials. The pipeline between the heater and the dew point temperature sensor is insulated, so that the reduction of relative humidity and the deterioration of temperature uniformity are avoided; the thermal insulation material generally refers to a material with a thermal conductivity less than or equal to 0.05W/mK,
the temperature sensor 2 is fixed in the heat-insulation and moisture-insulation shell 1, is close to one end of the heat-insulation and moisture-insulation shell 1 where the air to be detected enters, and has a smooth surface;
a heater 3 fixed in the heat-insulating and moisture-insulating casing 1 behind the temperature sensor 2;
a mixer 4 fixed in the heat-insulating and moisture-insulating casing 1 behind the heater 3 for improving the uniformity of the temperature of the air dry bulb;
the dew point temperature sensor 5 is fixed in the heat-insulating and moisture-insulating shell 1 behind the mixer 4 and is used for obtaining the temperature and calculating the relative humidity to obtain the dew point temperature;
and the sampling fan 6 is fixed at the other port of the heat-preservation and moisture-insulation shell 1 behind the dew point temperature sensor 5.
In a second embodiment, the present invention provides a temperature and humidity measuring device for measuring temperature and humidity of an air dry bulb, including:
the heat-insulating and moisture-insulating shell 1 is used for allowing air to be measured to pass through; the shape of the shell is not limited, the shell can be manufactured according to actual conditions, the flow velocity of the measured air passing through the temperature sensor is a, and a is more than or equal to 3 m/s;
the temperature sensor 2 adopts a platinum resistor as a temperature sensor, is fixed in the heat-insulation and moisture-insulation shell 1, is close to one end of the heat-insulation and moisture-insulation shell 1 where the air to be detected enters, and has a smooth surface;
and a heater 3 fixed in the heat-insulating and moisture-proof case 1 behind the temperature sensor 2, wherein the heating amount of the heater 3 is controlled to reduce the relative humidity of the dry bulb by 5% RH-15% RH, preferably by 10% RH.
And the mixer 4 is fixed in the heat-insulating and moisture-insulating shell 1 behind the heater 3, and is used for improving the uniformity of the temperature of the air dry balls to be better than 0.1 ℃, namely the temperature difference between the air dry balls is less than 0.1 ℃.
The dew point temperature sensor 5 is fixed in the heat-insulating and moisture-insulating shell 1 behind the mixer 4, the measurement accuracy of a temperature sensor in the dew point temperature sensor is better than +/-0.1 ℃, the measurement accuracy of a relative humidity sensor is better than +/-2% RH, and the dew point temperature sensor 5 is used for obtaining the temperature and calculating the relative humidity to obtain the dew point temperature.
And the sampling fan 6 is fixed at the other port of the heat-preservation and moisture-insulation shell behind the dew point temperature sensor 5.
In a third embodiment, as shown in fig. 2, the present invention provides a temperature and humidity measurement method for measuring temperature and humidity of an air dry bulb, including the following steps:
s1, measuring the temperature of the measured air at a preset flow rate to obtain a first measured temperature, namely the measured temperature;
s2, heating the air to be detected, and reducing the relative humidity of the air to be detected;
s3, improving the temperature uniformity of the detected air dry bulb;
s4, measuring the temperature and the relative humidity of the measured air dry bulb, and calculating to obtain the dew point temperature;
and S5, calculating the initial relative humidity of the measured air according to the dew point temperature and the first measured temperature, and taking the initial relative humidity as the humidity obtained by the measuring device.
In a fourth embodiment, the present invention provides a temperature and humidity measurement method for measuring temperature and humidity of an air dry bulb, including the following steps:
s1, measuring the temperature of the air to be measured at a flow velocity of more than or equal to 3m/S to obtain a first measured temperature, namely the measured temperature;
s2, heating the air to be detected to reduce the relative humidity of the air to be detected by 10% RH;
s3, the uniformity of the temperature of the air dry balls to be detected is improved to be better than 0.1 ℃, namely the temperature difference between the air dry balls is less than 0.1 ℃.
S4, measuring the temperature and the relative humidity of the measured air dry bulb, and calculating to obtain the dew point temperature;
wherein, the measurement accuracy of the temperature is better than +/-0.1 ℃, and the measurement accuracy of the relative humidity is better than +/-2% RH.
And S5, calculating the initial relative humidity of the measured air according to the dew point temperature and the first measured temperature, and taking the initial relative humidity as the humidity obtained by the measuring device.
Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
The present invention has been described in detail with reference to the specific embodiments and examples, but these are not intended to limit the present invention. Many variations and modifications may be made by one of ordinary skill in the art without departing from the principles of the present invention, which should also be considered as within the scope of the present invention.
Claims (11)
1. The utility model provides a temperature and humidity measurement device, its is used for air dry bulb temperature and humidity measurement, its characterized in that includes:
the heat-insulating and moisture-insulating shell is used for the tested air to pass through;
the temperature sensor is fixed in the heat-insulation and moisture-insulation shell, is close to one end of the heat-insulation and moisture-insulation shell where the air to be detected enters, and has a smooth surface;
the heater is fixed in the heat-preservation and moisture-insulation shell behind the temperature sensor;
the mixer is fixed in the heat-preservation and moisture-insulation shell behind the heater and is used for improving the uniformity of the temperature of the air dry bulb;
the dew point temperature sensor is fixed in a heat-insulating and moisture-insulating shell behind the mixer and used for obtaining the temperature and calculating the relative humidity to obtain the dew point temperature;
and the sampling fan is fixed at the other port of the heat-preservation and moisture-insulation shell behind the dew point temperature sensor.
2. The temperature and humidity measuring device according to claim 1, wherein: the measured air flow velocity passing through the temperature sensor is a, and a is more than or equal to 3 m/s.
3. The temperature and humidity measuring device according to claim 1, wherein: the temperature sensor is a platinum resistor.
4. The temperature and humidity measuring device according to claim 1, wherein: the heater is heated to reduce the relative humidity of the air by 5-15% RH.
5. The temperature and humidity measuring device according to claim 1, wherein: the mixer made the air dry bulb temperature uniformity better than 0.1 ℃.
6. The temperature and humidity measuring device according to claim 1, wherein: the measuring accuracy of a temperature sensor in the dew point temperature sensor is better than +/-0.1 ℃, and the measuring accuracy of a relative humidity sensor is better than +/-2% RH.
7. A temperature and humidity measurement method is used for measuring the temperature and humidity of an air dry bulb and is characterized by comprising the following steps:
s1, measuring the temperature of the measured air at a preset flow rate to obtain a first measured temperature;
s2, heating the air to be detected, and reducing the relative humidity of the air to be detected;
s3, improving the temperature uniformity of the detected air dry bulb;
s4, measuring the temperature and the relative humidity of the measured air dry bulb, and calculating to obtain the dew point temperature;
and S5, calculating the initial relative humidity of the measured air according to the dew point temperature and the first measured temperature.
8. The temperature and humidity measuring method according to claim 7, characterized in that: the preset flow rate is a, and a is more than or equal to 3 m/s.
9. The temperature and humidity measuring method according to claim 7, characterized in that: in step S2, the relative humidity of the air to be measured is lowered by 5% RH to 15% RH.
10. The temperature and humidity measuring method according to claim 7, characterized in that: in step S3, the uniformity of the temperature of the air dry bulb to be tested is improved to be better than 0.1 ℃.
11. The temperature and humidity measuring method according to claim 7, characterized in that: in step S4, the temperature measurement accuracy is better than + -0.1 deg.C, and the relative humidity measurement accuracy is better than + -2% RH.
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| CN202010401798.6A CN111443107A (en) | 2020-05-13 | 2020-05-13 | Temperature and humidity measuring device and measuring method |
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| CN202010401798.6A CN111443107A (en) | 2020-05-13 | 2020-05-13 | Temperature and humidity measuring device and measuring method |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112781649A (en) * | 2020-12-25 | 2021-05-11 | 海尔数字科技(无锡)有限公司 | Temperature and humidity measuring device based on NB wireless transmission |
| CN113587976A (en) * | 2021-06-09 | 2021-11-02 | 合肥通用机械研究院有限公司 | Wide temperature range air temperature and humidity sampling and measuring device |
| CN113607295A (en) * | 2021-06-09 | 2021-11-05 | 合肥通用机械研究院有限公司 | Low-temperature air temperature and humidity measurement and calculation method |
-
2020
- 2020-05-13 CN CN202010401798.6A patent/CN111443107A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112781649A (en) * | 2020-12-25 | 2021-05-11 | 海尔数字科技(无锡)有限公司 | Temperature and humidity measuring device based on NB wireless transmission |
| CN113587976A (en) * | 2021-06-09 | 2021-11-02 | 合肥通用机械研究院有限公司 | Wide temperature range air temperature and humidity sampling and measuring device |
| CN113607295A (en) * | 2021-06-09 | 2021-11-05 | 合肥通用机械研究院有限公司 | Low-temperature air temperature and humidity measurement and calculation method |
| CN113587976B (en) * | 2021-06-09 | 2024-04-09 | 合肥通用机械研究院有限公司 | Wide temperature range air temperature humidity sampling measurement device |
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