Temperature acquisition device for detecting thermal performance of fan coil

Abstract

The utility model discloses a temperature acquisition device for detecting the thermal performance of a fan coil, which comprises an air sampler, a temperature sensor, a temperature acquisition box and a fan, the air sampler is communicated with the temperature acquisition box through an air pipe, the bottom of the temperature acquisition box is provided with a water storage box, and the water storage box is communicated with the air pipe. The water storage box is communicated with the water storage tank through a communicating vessel, the temperature sensors are installed in the temperature acquisition box and comprise a dry-bulb temperature sensor and a wet-bulb temperature sensor, a gauze sleeve is arranged on the surface of the wet-bulb temperature sensor, the lower end of the gauze sleeve extends into the water storage box, and the upper end of the gauze sleeve is connected with the water storage tank. The temperature collecting box is further communicated with the fan, and a replaceable steel wire mesh is arranged at an air outlet of the fan. According to the utility model, the stability and the accuracy of data acquired by the temperature sensor in the process of testing the thermal performance of the fan coil can be ensured.

Description

Technical Field

[0001] This utility model relates to the field of building energy conservation testing technology, specifically to a temperature acquisition device for testing the thermal performance of fan coil units. Background Technology

[0002] With the widespread use of central air conditioning and residential air conditioning products in public and civil buildings, air conditioning energy consumption accounts for a high proportion of total building energy consumption. In today's advocacy of low-carbon living, reducing energy consumption is imperative. As the terminal device of air conditioning products, fan coil units require rigorous testing of their various performance indicators.

[0003] The air enthalpy difference method is a commonly used method for testing the thermal performance of fan coil units. This test method requires a sealed test space. The air in the room is maintained under the target test conditions by the combined action of the test unit and the air handling unit. The relative humidity is calculated by measuring the dry-bulb and wet-bulb temperatures of the supply and return air of the fan coil unit using a dry-bulb and wet-bulb temperature sampling device. This gives the air state at the sampling section and allows the calculation of the enthalpy difference between the supply and return air. At the same time, the airflow of the fan coil unit is measured. Multiplying the airflow by the enthalpy difference gives the cooling or heating capacity of the fan coil unit on the air side.

[0004] However, in existing technologies, wet-bulb and dry-bulb temperature measurements are mainly achieved by supplying water to the wet-bulb gauze used for wet-bulb temperature acquisition using a fixed water collection box. Because the water volume is fixed and rapidly evaporating reduces the water level, personnel need to frequently enter and exit the environmental chamber to check the water level throughout the testing process. This affects the already stable temperature and humidity inside the environmental chamber, resulting in significant deviations in the data collected by the wet-bulb and dry-bulb temperature sensors. It also greatly increases the labor and electricity costs throughout the testing cycle. Furthermore, existing technologies cannot guarantee a constant airflow velocity of 5 m / s across the surface of the wet-bulb and dry-bulb temperature sensors, which can easily lead to significant deviations in the data collected by the wet-bulb temperature sensors. This results in errors in the calculation of the air-side enthalpy difference during the overall fan coil unit thermal performance test, affecting the cooling and heating parameters obtained in the fan coil unit thermal performance test. Utility Model Content

[0005] The purpose of this invention is to provide a temperature acquisition device for detecting the thermal performance of fan coil units, which can ensure the stability and accuracy of the data collected by the temperature sensor during the testing of the thermal performance of fan coil units.

[0006] The technical solution of this utility model is as follows:

[0007] A temperature acquisition device for detecting the thermal performance of fan coil units includes an air sampler, a temperature sensor, a temperature acquisition box, and a fan. The air sampler is connected to the temperature acquisition box via a duct. A water storage box is installed at the bottom of the temperature acquisition box, and the water storage box is connected to a water storage tank via a connector. The temperature sensor is installed inside the temperature acquisition box. The temperature sensor includes a dry-bulb temperature sensor and a wet-bulb temperature sensor. A gauze sleeve is provided on the surface of the wet-bulb temperature sensor, and the lower end of the gauze sleeve extends into the water storage box. The temperature acquisition box is also connected to the fan. The air outlet of the fan is provided with a replaceable wire mesh, and the air velocity at the fan outlet is adjusted by using wire mesh of different densities.

[0008] This invention employs a water storage tank as an automatic water replenishment device for the wet-bulb temperature sensor, providing continuous water to the gauze cover and ensuring the sensor surface remains consistently moist. Adding water to the tank guarantees a constant water supply, effectively maintaining a relatively sealed environment within the temperature acquisition chamber and minimizing the impact of external environmental factors on the internal space. Frequent personnel entry and exit from the testing space to check and replenish the water tank eliminates the need for frequent checks, ensuring a stable testing environment and accurate test data. The test wind speed is regulated via an adjustable wire mesh. The mesh creates resistance at the fan outlet, ensuring the wind speed passing through the wet-bulb temperature sensor is the required 5 m / s. Any deviation can be corrected by adjusting the wire mesh density.

[0009] This utility model also has the following preferred designs:

[0010] The air sampler of this utility model is composed of several thinner branch pipes and a thicker main pipe connected together. Several air inlets are opened on both the branch pipes and the main pipe. The connection between the main pipe and the branch pipes is sealed. If the main pipe and the branch pipes are made of metal, they can be sealed and fixed by welding. If they are made of plastic, they can be sealed and fixed by applying sealant. The ends of the branch pipes and the main pipe are sealed.

[0011] The temperature acquisition box of this utility model has a temperature sensor mounting hole on its top wall. A rubber plug is provided in the mounting hole, and the rubber plug has an insertion hole for the temperature sensor to be inserted. The temperature sensor is fixed by the elasticity of the rubber plug, which facilitates the adjustment of the insertion depth of the temperature sensor.

[0012] The temperature acquisition box of this utility model has a transparent box body, such as a transparent acrylic sheet, which is intended to facilitate observation of its internal conditions.

[0013] The water storage box, communicating vessel, and water tank of this utility model are also preferably designed to be transparent to facilitate observation of their internal water level.

[0014] The dry-bulb temperature sensor and the wet-bulb temperature sensor of this invention are both Class A high-precision stainless steel armored PT100 temperature sensors. The difference between the dry-bulb temperature sensor and the wet-bulb temperature sensor is that the surface of the wet-bulb temperature sensor is provided with a gauze sleeve, and the end of the gauze sleeve must always be immersed in water, thereby ensuring that the surface of the wet-bulb temperature sensor is always kept moist.

[0015] The temperature acquisition box of this utility model is mounted on a bracket, which is preferably made of metal, in order to stably support the temperature acquisition box.

[0016] The beneficial effects of this utility model are as follows:

[0017] 1. This invention solves the problem of poor accuracy and stability of data collected by dry-bulb and wet-bulb temperature sensors in the thermal performance testing of fan coil units, and its operation is also simpler. By equipping the temperature acquisition device with a water tank, water storage box, and communicating vessel, automatic water replenishment can be achieved, eliminating the need for frequent manual checks of the water level in the storage box within the test environment. This reduces the impact on the already stable indoor temperature and humidity, thereby ensuring the accuracy of the test data and shortening the test cycle and reducing test costs.

[0018] 2. This utility model uses a dedicated sampling fan, and an adjustable wire mesh is installed at the fan outlet to ensure that the wind speed passing over the surface of the temperature sensor is stable and remains at the target wind speed, so as to ensure the accuracy of the data collected by the temperature sensor.

[0019] 3. The temperature acquisition box of this utility model is made of transparent material to facilitate observation of the status of the temperature sensor inside the temperature acquisition box. Multiple temperature sensor mounting holes are provided on the top wall of the temperature acquisition box to facilitate comparison and calibration of sensor data and ensure the accuracy of test data. Attached Figure Description

[0020] Figure 1 This is a perspective view of a temperature acquisition device for detecting the thermal performance of fan coil units according to this utility model;

[0021] Figure 2 This is a front view of a temperature acquisition device for detecting the thermal performance of fan coil units according to this utility model;

[0022] Figure 3 This is a top view of a temperature acquisition device for detecting the thermal performance of fan coil units according to this utility model.

[0023] Explanation of reference numerals in the attached figures:

[0024] 1-Branch pipe, 2-Main pipe, 3-Air duct, 4-Water storage tank, 5-Water inlet, 6-Temperature acquisition box, 7-Water storage box, 8-Rubber stopper, 9-Dry bulb temperature sensor, 10-Wet bulb temperature sensor, 11-Wire mesh, 12-Fan, 13-Bracket, 14-Gauze cover, 15-Communicating device. Detailed Implementation

[0025] The technical solution of this utility model will be described in detail below with reference to the accompanying drawings and embodiments, so that those skilled in the art can better understand and implement the technical solution of this utility model.

[0026] like Figures 1 to 3 As shown, a temperature acquisition device for detecting the thermal performance of fan coil units includes an air sampler, a temperature sensor, a temperature acquisition box 6, and a fan 12. The air sampler is connected to the temperature acquisition box 6 via a duct 3. A water storage box 7 is provided at the bottom of the temperature acquisition box 6, and the water storage box 7 is connected to a water storage tank 4 via a connector 15. The temperature sensor is installed inside the temperature acquisition box 6. The temperature sensor includes a dry-bulb temperature sensor 9 and a wet-bulb temperature sensor 10. A gauze cover 14 is provided on the surface of the wet-bulb temperature sensor 10, and the lower end of the gauze cover 14 extends into the water storage box 7. The temperature acquisition box 6 is also connected to the fan 12. A replaceable wire mesh 11 is provided at the air outlet of the fan 12, and the air speed at the air outlet of the fan 12 is adjusted by using wire mesh 11 of different densities.

[0027] In one embodiment, the air sampler is composed of several thinner branch pipes 1 and a thicker main pipe 2 connected together. Both the branch pipes 1 and the main pipe 2 are provided with several air inlets. The connection between the main pipe 2 and the branch pipes 1 is sealed. If the main pipe 2 and the branch pipes 1 are made of metal, they can be sealed and fixed by welding. If they are made of plastic, they can be sealed and fixed by applying sealant. The ends of the branch pipes 1 and the main pipe 2 are sealed. The fan 12 provides air power and draws in as much air as possible from around the fan coil unit through the air inlets on the air sampler.

[0028] In one embodiment, a temperature sensor mounting hole is provided on the top wall of the temperature acquisition box 6. A rubber plug 8 is provided in the mounting hole, and the rubber plug 8 is provided with an insertion hole for the temperature sensor to be inserted. The temperature sensor is fixed by the elasticity of the rubber plug 8, which facilitates the adjustment of the insertion depth of the temperature sensor.

[0029] In one embodiment, the temperature acquisition box 6 is a transparent box, such as a transparent acrylic sheet, to facilitate observation of its internal conditions. A round hole is opened on the bottom wall of the temperature acquisition box 6, and a water storage box 7 covers the round hole from the bottom and makes a sealed connection.

[0030] In one embodiment, the water storage box 7, the communicating vessel 15 and the water tank 4 are also preferably configured as transparent structures to facilitate observation of their internal water level, wherein the water tank 4 is provided with a water inlet 5.

[0031] In one embodiment, the dry-bulb temperature sensor 9 and the wet-bulb temperature sensor 10 are both Class A high-precision stainless steel armored PT100 temperature sensors. The difference between the dry-bulb temperature sensor 9 and the wet-bulb temperature sensor 10 is that the surface of the wet-bulb temperature sensor 10 is provided with a gauze sleeve 14, and the end of the gauze sleeve 14 must always be immersed in water, thereby ensuring that the surface of the wet-bulb temperature sensor 10 is always kept moist.

[0032] In one embodiment, the temperature acquisition box 6 is mounted on a bracket 13, which is preferably made of metal, for the purpose of stably supporting the temperature acquisition box 6.

[0033] The testing method for this utility model is as follows:

[0034] First, place the air sampler at the air outlet of the fan coil unit to be tested; then check the water level in the water tank 4. When the water level is below the minimum water level, add water in time, and check whether the bottom of the gauze cover 14 covering the surface of the wet-bulb temperature sensor 10 is immersed in the water storage box 7; next, turn on the fan 12 to perform the test; finally, check the data collected by the dry-bulb temperature sensor 9 and the wet-bulb temperature sensor 10 in the control computer, and perform calculations according to relevant specifications.

[0035] The above embodiments are merely preferred embodiments of this utility model, but they cannot be construed as limiting the utility model. Any modifications and improvements made based on the concept of this utility model should fall within the protection scope of this utility model, and the specific protection scope is subject to the claims.

Claims

1. A temperature acquisition device for detecting the thermal performance of fan coil units, comprising an air sampler, a temperature sensor, a temperature acquisition box, and a fan, characterized in that, The air sampler is connected to the temperature acquisition box via a duct. A water storage box is located at the bottom of the temperature acquisition box, and the water storage box is connected to a water tank via a connector. The temperature sensor is installed inside the temperature acquisition box. The temperature sensor includes a dry-bulb temperature sensor and a wet-bulb temperature sensor. A gauze cover is provided on the surface of the wet-bulb temperature sensor, and the lower end of the gauze cover extends into the water storage box. The temperature acquisition box is also connected to the fan. The air outlet of the fan is provided with a replaceable wire mesh, and the air speed at the fan outlet is adjusted by using wire mesh of different densities.

2. The temperature acquisition device for detecting the thermal performance of fan coil units according to claim 1, characterized in that: The air sampler consists of several thinner branch pipes connected to a thicker main pipe, and both the branch pipes and the main pipe have several air inlets.

3. The temperature acquisition device for detecting the thermal performance of fan coil units according to claim 1, characterized in that: The temperature acquisition box has multiple mounting holes for temperature sensors on its top wall. Each mounting hole is fitted with a rubber plug, and the rubber plug has an insertion hole for the temperature sensor to be inserted.

4. The temperature acquisition device for detecting the thermal performance of fan coil units according to claim 1, characterized in that: The temperature acquisition box has a transparent body.

5. The temperature acquisition device for detecting the thermal performance of fan coil units according to claim 1, characterized in that: The water storage box, the water tank, and the communicating vessel are all transparent structures.

6. The temperature acquisition device for detecting the thermal performance of fan coil units according to claim 1, characterized in that: The dry-bulb temperature sensor and the wet-bulb temperature sensor are both Class A high-precision stainless steel armored PT100 temperature sensors.

7. The temperature acquisition device for detecting the thermal performance of fan coil units according to claim 1, characterized in that: The temperature acquisition box is mounted on a bracket.

Images