CN112629901A - Enthalpy difference room air conditioner efficiency test device - Google Patents
Enthalpy difference room air conditioner efficiency test device Download PDFInfo
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- CN112629901A CN112629901A CN202011497588.8A CN202011497588A CN112629901A CN 112629901 A CN112629901 A CN 112629901A CN 202011497588 A CN202011497588 A CN 202011497588A CN 112629901 A CN112629901 A CN 112629901A
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- air conditioner
- bulb thermometer
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M99/00—Subject matter not provided for in other groups of this subclass
- G01M99/002—Thermal testing
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M99/00—Subject matter not provided for in other groups of this subclass
- G01M99/005—Testing of complete machines, e.g. washing-machines or mobile phones
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/02—Devices for withdrawing samples
- G01N1/22—Devices for withdrawing samples in the gaseous state
- G01N1/2247—Sampling from a flowing stream of gas
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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
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Abstract
The enthalpy difference room air conditioner energy efficiency test device comprises a lifting platform and an air sampling and measuring device arranged on the lifting platform, wherein the lifting platform is used for supporting and lifting an air conditioner to a proper height, and the air sampling and measuring device is used for collecting air at an air inlet of the air conditioner to measure; the air sampling and measuring device comprises an air channel arranged at the top of the lifting platform, an exhaust fan arranged at an air outlet of the air channel, an air sampling cylinder arranged at the air inlet of the air channel, and a dry-bulb thermometer and a wet-bulb thermometer which are arranged on the air channel, wherein probes of the dry-bulb thermometer and the wet-bulb thermometer are positioned inside the air channel. (1) The test device is convenient for installing the air conditioner and can adjust the height of the air conditioner at any time. (2) The air conditioner is suitable for various wall-mounted air conditioners. (3) And the temperature is respectively measured by using a dry-wet bulb thermometer and a wet-bulb thermometer next to the sampling position, the humidity value is checked out according to a dry-humidity comparison table, the air enthalpy value is calculated, and the accuracy of data is ensured more.
Description
Technical Field
The invention relates to the technical field of air conditioner detection devices, in particular to an enthalpy difference room air conditioner energy efficiency testing device.
Background
The GB/T7725 room air conditioner stipulates that when an enthalpy difference chamber is used for detecting the energy efficiency of the air conditioner, the air conditioner needs to be hung up and the enthalpy value of air at an air inlet of the air conditioner needs to be collected. The method of testing is typically to use bolts to secure the air conditioner to the truss and then to secure the air sampling tube above the air conditioner. The truss can not be lifted and lowered, the position of the bolt needs to be adjusted manually, the fixing performance is poor, the height can not be adjusted after the truss is finished, the air sampling cylinder needs to convey air to the temperature and humidity tester through a testing pipeline, and the length of the pipeline and the calculation mode are to be improved.
Disclosure of Invention
The invention provides an enthalpy difference room air conditioner energy efficiency test device which is simple in structure and convenient to use and overcomes the defects of the prior art.
The invention is realized by the following technical scheme:
the utility model provides an enthalpy difference room air conditioner efficiency test device which characterized in that: the air sampling and measuring device is used for collecting air at an air inlet of the air conditioner to measure; the air sampling and measuring device comprises an air channel arranged at the top of the lifting platform, an exhaust fan arranged at an air outlet of the air channel, an air sampling cylinder arranged at the air inlet of the air channel, and a dry-bulb thermometer and a wet-bulb thermometer which are arranged on the air channel, wherein probes of the dry-bulb thermometer and the wet-bulb thermometer are positioned inside the air channel.
The lifting platform comprises a base, a workbench and a hoisting bracket arranged between the base and the workbench; the bottom of the base is provided with support legs or walking wheels with brakes, one side of the workbench is fixedly provided with an air conditioner hanging plate, and the air duct is fixed on the workbench.
The lifting support adopts a diamond expansion bracket, a lifting driving device is also arranged between the base and the workbench and adopts a cylinder, a hydraulic cylinder or an electric cylinder, and a control switch of the cylinder, the hydraulic cylinder or the electric cylinder is arranged on one side of the base or the workbench.
A plurality of side-by-side air sampling cylinders are adopted, and each air sampling cylinder is provided with a plurality of air suction holes.
The air duct is box-shaped.
The beneficial effect of the invention is that,
(1) the test device is convenient for installing the air conditioner and can adjust the height of the air conditioner at any time.
(2) The air conditioner is suitable for various wall-mounted air conditioners.
(3) And a dry-wet bulb thermometer and a wet-bulb thermometer are used for respectively measuring the temperature close to the sampling position, the humidity value is found out according to a dry-humidity comparison table, the air enthalpy value is calculated, and the accuracy and the rigor of the data are ensured.
Drawings
Fig. 1-3 are schematic front, right, and top views of the present invention in that order.
In the figure: 1. the air sampling device comprises an air sampling cylinder, 2 parts of a dry bulb thermometer, 3 parts of a wet bulb thermometer, 4 parts of an air duct, 5 parts of a fan and an air outlet, 6 parts of a hoisting bracket, 7 parts of a hydraulic ejector rod, 8 parts of a control switch, 9 parts of an air conditioner hanging plate and 10 parts of an air conditioner. 11 base, 12 working table, 13 feet and 14 air suction holes.
Detailed Description
The attached drawing is an embodiment of the invention.
The enthalpy difference room air conditioner energy efficiency test device comprises a lifting platform and an air sampling and measuring device arranged on the lifting platform, wherein the lifting platform is used for supporting and lifting an air conditioner to a proper height, and the air sampling and measuring device is used for collecting air at an air inlet of the air conditioner to measure; the air sampling and measuring device comprises an air duct 4 arranged at the top of the lifting platform, an exhaust fan 5 arranged at an air outlet of the air duct, an air sampling cylinder 1 arranged at the air inlet of the air duct, and a dry bulb thermometer 2 and a wet bulb thermometer 3 arranged on the air duct, wherein probes of the dry bulb thermometer and the wet bulb thermometer are positioned inside the air duct 4.
The lifting platform comprises a base 11, a workbench 12 and a hoisting bracket 6 arranged between the base and the workbench; the bottom of the base is provided with support legs 13 or walking wheels with brakes, one side of the workbench is fixedly provided with an air conditioner hanging plate 9, and the air duct 4 is fixed on the workbench.
The lifting support 6 adopts a diamond-shaped expansion bracket, a lifting driving device is also arranged between the base and the workbench and adopts a cylinder, a hydraulic cylinder 7 or an electric cylinder, and a control switch 8 of the cylinder, the hydraulic cylinder or the electric cylinder is arranged on one side of the base or the workbench.
A plurality of air sampling cylinders 1 are arranged side by side, and each air sampling cylinder is provided with a plurality of air suction holes 14.
The air duct 4 is box-shaped.
The enthalpy difference room air conditioner energy efficiency test device consists of two parts: the device comprises a pneumatic control lifting table, and an integrated air sampling measurer. The air sampling measuring device comprises an air sampling cylinder 1, a dry bulb thermometer 2, a wet bulb thermometer 3, an air duct 4, a fan and an air outlet 5, and the integrated air sampling measuring device is formed. The starting control lifting platform comprises a lifting support 6, a hydraulic ejector rod 7, a hydraulic switch 8 and an air conditioner hanging plate 9. Wherein the deviation of the dry bulb thermometer 2 is +/-0.3 ℃, the deviation of the wet bulb thermometer 3 is +/-0.2 ℃, and the distance between the air sampling cylinder and the air inlet of the air conditioner is 0.15 m.
The working principle is as follows: the air conditioner is hung on an air conditioner hanging plate, a control switch of a lifting driving device (adopting an air cylinder, a hydraulic cylinder or an electric cylinder) is adjusted, the air conditioner is lifted to a proper height, after a laboratory working condition is started, an exhaust fan and an air sampling cylinder work together, air in an air inlet area of the air conditioner is sucked into an air channel, and a dry bulb thermometer and a wet bulb thermometer are used for collecting dry bulb temperature and wet bulb temperature together. The relative humidity was found from table 1 and converted to absolute humidity (i.e., the moisture content of air). And calculating the air inlet enthalpy value according to the formula 1.
An enthalpy value calculation formula of the air is as follows:
in the formula: t- -air temperature (dry bulb temperature adopted)
d- -moisture content of air kg/kg Dry air
1.01- - -average constant pressure specific heat kj/(kg. K) of dry air
1.84- -average constant pressure specific heat kj/(kg. K) of steam
2490- -latent heat of vaporization kj/kg of water at-0 deg.C
The above is a method for calculating the enthalpy of air.
Formula for calculating moisture content from relative humidity
d =622(op /( B - op))
Wherein: o is relative humidity, percent;
P is the water vapor saturation partial pressure, a water vapor meter can be checked, and the water vapor meter corresponds to the temperature one by one, pa;
b is atmospheric pressure, different altitudes and regions are different, and the atmospheric pressure is generally 101325 pa;
fitting formula of temperature and water vapor saturation partial pressure of wet air (the range of (0-50 deg.) commonly used by us)
The smaller the fitting range, the higher the accuracy.
According to the saturated water vapor table, the saturated partial pressure P of the water vapor is 0.6082KPa, namely 608.2 Pa. Therefore, the moisture content of the air, namely the absolute humidity is calculated according to the relative humidity, the water vapor saturation partial pressure and the atmospheric pressure.
The following table is a comparison table of dry bulb temperature, wet bulb temperature and relative humidity, and belongs to the prior art. Since the relative humidity (percentage) span is 5, the span is large, and a dry humidity comparison table with smaller span can be searched from the Internet. In actual operation, a dry bulb temperature value and a wet bulb temperature value are measured. And according to the position of the dry bulb temperature value in the leftmost column in the table, rightwards corresponding to a plurality of wet bulb temperature values in a horizontal row, finding out the measured wet bulb temperature value from the horizontal row, and checking the corresponding topmost relative humidity value of the wet bulb temperature value upwards. For example, the dry bulb temperature value is 20 ℃, the wet bulb temperature value is 13.5 ℃, the wet bulb temperature value is 13.09-13.79 ℃, and the relative humidity is 45-50%, wherein 48% is taken. When the dry bulb temperature value is fixed, the higher the wet bulb temperature value is, the larger the corresponding relative humidity value is.
Claims (5)
1. The utility model provides an enthalpy difference room air conditioner efficiency test device which characterized in that: the air sampling and measuring device is used for collecting air at an air inlet of the air conditioner to measure; the air sampling and measuring device comprises an air channel arranged at the top of the lifting platform, an exhaust fan arranged at an air outlet of the air channel, an air sampling cylinder arranged at the air inlet of the air channel, and a dry-bulb thermometer and a wet-bulb thermometer which are arranged on the air channel, wherein probes of the dry-bulb thermometer and the wet-bulb thermometer are positioned inside the air channel.
2. The enthalpy difference chamber air conditioner energy efficiency test apparatus according to claim 1, characterized in that: the lifting platform comprises a base, a workbench and a hoisting bracket arranged between the base and the workbench; the bottom of the base is provided with support legs or walking wheels with brakes, one side of the workbench is fixedly provided with an air conditioner hanging plate, and the air duct is fixed on the workbench.
3. The enthalpy difference chamber air conditioner energy efficiency test apparatus according to claim 1, characterized in that: the lifting support adopts a diamond expansion bracket, a lifting driving device is also arranged between the base and the workbench and adopts a cylinder, a hydraulic cylinder or an electric cylinder, and a control switch of the cylinder, the hydraulic cylinder or the electric cylinder is arranged on one side of the base or the workbench.
4. The enthalpy difference chamber air conditioner energy efficiency test apparatus according to claim 1, characterized in that: a plurality of side-by-side air sampling cylinders are adopted, and each air sampling cylinder is provided with a plurality of air suction holes.
5. The enthalpy difference chamber air conditioner energy efficiency test apparatus according to claim 1, characterized in that: the air duct is box-shaped.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011497588.8A CN112629901A (en) | 2020-12-17 | 2020-12-17 | Enthalpy difference room air conditioner efficiency test device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011497588.8A CN112629901A (en) | 2020-12-17 | 2020-12-17 | Enthalpy difference room air conditioner efficiency test device |
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| Publication Number | Publication Date |
|---|---|
| CN112629901A true CN112629901A (en) | 2021-04-09 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011497588.8A Pending CN112629901A (en) | 2020-12-17 | 2020-12-17 | Enthalpy difference room air conditioner efficiency test device |
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| Country | Link |
|---|---|
| CN (1) | CN112629901A (en) |
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2020
- 2020-12-17 CN CN202011497588.8A patent/CN112629901A/en active Pending
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