Device for testing heat exchange performance of small air conditioning unit in constructional engineering

Abstract

The utility model relates to a device for testing the heat exchange performance of a small-sized air conditioning unit in constructional engineering. The device comprises a temperature and humidity control device, a temperature and humidity acquisition device and an air pipe, the temperature and humidity control device comprises integrated refrigeration equipment and a humidification device which are arranged in the shell; one of the two ends of the shell is an air outlet, the other end of the shell is an air inlet, and the air outlet and the air inlet are respectively connected with a heat preservation soft connection air pipe. The temperature and humidity acquisition device is arranged in the heat preservation soft connection air pipe; one end of the air pipe is connected with the heat preservation soft connection air pipe, and the other end of the air pipe is used for being connected with an air inlet or an air outlet of tested equipment. According to the utility model, a stable test working condition can be provided for the tested air-conditioning equipment on a construction site, so that the problem that the test result has great deviation under the existing engineering condition is solved.

Description

Technical Field

[0001] The utility model relates to a testing device for the heat exchange performance of a small air conditioning unit in a construction project, belonging to the technical field of HVAC equipment testing. Background Art

[0002] In recent years, with the continuous development of energy-saving building systems such as green buildings, ultra-low energy buildings, and passive buildings, people have increasingly demanded higher energy-saving performance from buildings. The use of high-performance equipment is a key component of building energy conservation, and heating and ventilation equipment accounts for a significant portion of overall energy consumption. Because equipment performance and efficiency are tested in the laboratory under the experimental conditions specified in the product standards, this is inconsistent with the on-site acceptance conditions after equipment construction is completed. It is difficult to verify on-site whether the product's performance meets the requirements. Although laboratory verification and re-inspection of heating and ventilation equipment are performed separately during the construction process, on-site testing is still required to ensure that the overall performance of the heating equipment meets the design requirements after completion.

[0003] On-site testing of small air conditioning units generally uses the air enthalpy difference method. This involves using a temperature and humidity control device (i.e., an air handling unit) to control the required on-site ambient temperature and humidity. Using corrugated hoses, temperature and humidity sensors and pressure sensors can be connected to the small air conditioning unit. The signals from these sensors are collected by an intelligent control device. Using fuzzy control principles, the standard operating conditions of the product can be met, allowing for on-site testing of the object being tested, thereby determining its performance and energy efficiency parameters.

[0004] However, in actual construction projects, after installing a small air conditioning unit system, it is necessary to test and evaluate its performance and efficiency on-site. The current laboratory testing and evaluation methods are the duct method and the two-chamber method. However, during the project completion acceptance phase, the indoor and outdoor air conditions often do not meet the laboratory testing conditions. Hot wire anemometers and temperature and humidity modules are generally used to measure the air volume and temperature and humidity of small air conditioning equipment on-site. Due to the influence of the on-site environment, only the wind speed and the environment at that time are measured. The measured results cannot be compared with the nominal energy of the small air conditioning equipment, and the performance and energy efficiency of the small air conditioning equipment cannot be accurately evaluated. Due to the characteristics of the equipment itself and the changes in indoor and outdoor ambient temperature, it is difficult for small air conditioning equipment to maintain stability in a short period of time, resulting in low accuracy of the final measurement results.

[0005] Therefore, the existing engineering site testing methods have great limitations and are restricted by actual conditions, especially when the project is completed in a transitional season. In such engineering cases, the test results will have large deviations. Even in summer or winter, it is difficult to obtain standard test conditions. Summary of the Invention

[0006] In response to the above problems, the utility model provides a heat exchange performance testing device for small air conditioning units based on the air enthalpy difference method to solve the above technical problems. At the same time, the device is easy to carry, quick to install, and can set corresponding test conditions to meet the test performance and efficiency.

[0007] The utility model adopts the following technical solutions:

[0008] A test device for the heat exchange performance of small air-conditioning units in construction projects, comprising a temperature and humidity control device I, a temperature and humidity collection device II, and an air duct; the temperature and humidity control device I comprises an integrated refrigeration device and a humidifying device 6 arranged in a shell; one end of the shell is an air outlet and the other end is an air inlet, and the air outlet and the air inlet are respectively connected to an insulated flexible air duct 8; the temperature and humidity collection device II is arranged in the insulated flexible air duct 8; one end of the air duct is connected to the insulated flexible air duct 8, and the other end is used to connect to the air inlet or air outlet of the equipment under test.

[0009] Preferably, the integrated refrigeration device includes a variable frequency fan 7 and a compressor 1, a four-way valve 2, a condenser 3, an electronic expansion valve 4, and an evaporator 5 connected in sequence.

[0010] Furthermore, the humidifying device 6 is located between the evaporator 5 and the variable frequency fan 7 .

[0011] Preferably, the temperature and humidity collecting device includes a temperature sensor, a humidity sensor, a pressure sensor, and one of a wind speed sensor and a thermal flow meter fixed on the inner wall of the heat-insulating flexible air duct 8.

[0012] Preferably, it also includes a data control device III, which includes a unit control module 12 and a parameter acquisition device for the equipment under test; the unit control module 12 is used to control the outlet temperature, inlet temperature and outlet humidity of the test device for the heat exchange performance of the small air-conditioning unit in the construction project; the parameter acquisition device for the equipment under test includes a temperature, wind speed and pressure acquisition device 10 and an electric power acquisition module 11; the temperature, wind speed and pressure acquisition device 10 and the electric power acquisition module 11 are each electrically connected to the equipment under test through a wire.

[0013] Furthermore, the device under test is a central air conditioner installed in a construction project.

[0014] The beneficial effect of the present invention is that it provides a heat exchange performance test device for small air-conditioning units based on the air enthalpy difference method. Based on the air enthalpy difference principle, its temperature and humidity control device, temperature and humidity acquisition device, and data control device are integrated into one to form a portable and lightweight test device. The air duct can be used at the construction site to connect with the air inlet and outlet of the air conditioner to be tested, thereby providing a stable test environment parameter for the air conditioner to be tested, which can effectively improve the state where the on-site conditions of the small air conditioner device are different from the standard working conditions, facilitate on-site detection of equipment performance and efficiency, and effectively improve test accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 The utility model is a structural schematic diagram of a device for testing the heat exchange performance of a small air conditioning unit in a construction project.

[0016] Figure 2 It is a schematic diagram of the installation of the tested equipment and the testing device of the present invention.

[0017] In the figure, I. temperature and humidity control device, 1. compressor, 2. four-way valve, 3. condenser, 4. electronic expansion valve, 5. evaporator, 6. humidifier, 7. variable frequency fan, II. temperature and humidity acquisition device, 8. insulation flexible air duct, 9. sensor device (temperature / humidity / wind speed / pressure, etc.), III. data control device, 10. temperature, wind speed, pressure acquisition device, 11. electric power acquisition module, 12. unit control module. DETAILED DESCRIPTION

[0018] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0019] See also Figure 1-2 A test device for the heat exchange performance of a small air-conditioning unit in a construction project includes a temperature and humidity control device I, a temperature and humidity collection device II, and an air duct; the temperature and humidity control device I includes an integrated refrigeration device and a humidifying device 6 arranged in a shell; one end of the shell is an air outlet and the other end is an air inlet, and the air outlet and the air inlet are respectively connected to an insulated flexible air duct 8; the temperature and humidity collection device II is arranged in the insulated flexible air duct 8; one end of the air duct is connected to the insulated flexible air duct 8, and the other end is used to connect to the air inlet or air outlet of the device under test.

[0020] The equipment under test is a central air conditioner installed in a construction project.

[0021] In this embodiment, see Figure 1The integrated refrigeration device includes a variable frequency fan 7, and is connected in sequence to a compressor 1, a four-way valve 2, a condenser 3, an electronic expansion valve 4, and an evaporator 5. These components of the integrated refrigeration device are basic functional components of the refrigeration device, so their functions and principles will not be described in detail.

[0022] Furthermore, the humidifying device 6 is located between the evaporator 5 and the variable frequency fan 7 .

[0023] In this embodiment, see Figure 1 The temperature and humidity collection device includes a temperature sensor, a humidity sensor, a pressure sensor, and one of a wind speed sensor and a thermal flow meter fixed on the inner wall of the thermal insulation flexible air duct 8.

[0024] In this embodiment, see Figure 1 , also includes a data control device III, the data control device III includes a unit control module 12 and a parameter acquisition device for the equipment under test; the unit control module 12 is used to control the outlet air temperature, inlet air temperature and outlet air humidity of the test device for the heat exchange performance of a small air conditioning unit in the construction project; the parameter acquisition device for the equipment under test includes a temperature, wind speed and pressure acquisition device 10 and an electric power acquisition module 11; the temperature, wind speed and pressure acquisition device 10 and the electric power acquisition module 11 are each electrically connected to the equipment under test through a wire.

[0025] See also Figure 1 , main functional components:

[0026] Ⅰ. Temperature and humidity control device, including compressor, four-way valve, condenser, electronic expansion valve, evaporator, humidification module, variable frequency fan, etc., which are combined through pipelines.

[0027] Ⅱ. Temperature and humidity collection device, which is installed in the air duct of the insulation hose and connected to the machine under test. The air duct of the insulation hose is equipped with temperature sensor, humidity sensor, pressure sensor, wind speed sensor / heat flow meter, etc., collection device.

[0028] III. Data control device, including temperature, wind speed and pressure acquisition devices for the device under test, electric power acquisition module for the device under test, and unit control module for the unit of the test device itself.

[0029] Instructions for use: The space where the small air-conditioning unit under test (hereinafter referred to as the "tested device") is located uses a temperature and humidity control module for environmental control. The heat pump unit equipment is controlled by the unit control module 12. After heat and humidity treatment, it is made to reach the air state parameters of a typical air conditioner. It is connected to the tested device through the insulated flexible air duct 8 and passed into the air inlet / outlet of the tested device. Real-time data is collected through the sensors thereon to enable the tested device to operate under the required working conditions. The electrical parameters of the tested object are collected through the electric power acquisition module 11, thereby collecting the state parameters of all relevant performances, and data collection and analysis of the electric power acquisition module are realized based on the enthalpy difference principle. The data control device III controls the temperature and humidity control device I and the temperature and humidity acquisition device II in real time and collects data in real time, ultimately achieving on-site testing of the performance and efficiency of the tested device.

[0030] It should be noted that the method of using the principle of enthalpy difference method to test the performance of the equipment under test belongs to the existing technology, and the data analysis and fuzzy control involved therein belong to the existing technology. The contribution made by the present invention mainly lies in providing an integrated testing device that integrates parameter control, data monitoring, and temperature difference control functions to facilitate on-site testing; it can provide a stable testing condition for the air-conditioning equipment under test at the construction site, thereby solving the problem that the test results under existing engineering conditions will have large deviations, especially for environments in summer or winter that are very different from the actual test conditions, and obtaining actual test data with more reference value.

[0031] This test device has strong scalability and can increase the number of temperature and humidity sensors and heat flow meters according to actual needs; the test device adopts an air handling device to stably control the output ambient temperature; the temperature and humidity control module controls the ambient temperature based on the air enthalpy difference method through the heat pump principle and the air humidity control module, and the device automatically controls it; the monitoring and control host can be equipped with temperature and humidity sensors, pressure sensors, wind speed sensors, heat flow meters, etc.; the monitoring and control host can collect and display sensor monitoring data in real time, collect power parameters of the equipment, and calculate and display the collected parameters.

[0032] In summary, the present invention provides a test device for the heat exchange performance of small air conditioning units in construction projects. Based on the principle of air enthalpy difference, it integrates a temperature and humidity control device, a temperature and humidity acquisition device, and a data control device. Through the temperature and humidity control device, the required operating conditions are achieved, and the temperature and humidity and air volume are accurately measured and stabilized, reducing the impact on measurement accuracy. At the same time, a portable and lightweight test device is formed, which can effectively improve the state of testing small air conditioning units when the on-site conditions are different from the standard operating conditions, facilitate on-site testing of equipment performance and efficiency, and effectively improve test accuracy.

[0033] The above are preferred embodiments of the present invention. Ordinary technicians in this field can also make their own changes or improvements on this basis. Without departing from the overall concept of the present invention, these changes or improvements should fall within the scope of protection required by the present invention.

Claims

1. A device for testing the heat exchange performance of small air conditioning units in construction projects, characterized by: It includes a temperature and humidity control device (I), a temperature and humidity collection device (II), and an air duct; The temperature and humidity control device (I) includes an integrated refrigeration device and a humidifying device (6) arranged in a shell; one end of the shell is an air outlet and the other end is an air inlet, and the air outlet and the air inlet are each connected to a heat-insulating flexible air pipe (8); The temperature and humidity collecting device (II) is provided in the heat-insulating flexible air duct (8); One end of the air duct is connected to the heat-insulating flexible air duct (8), and the other end is used to be connected to the air inlet or outlet of the device under test.

2. The device for testing the heat exchange performance of a small air conditioning unit in a construction project according to claim 1, characterized in that: The integrated refrigeration device comprises a variable frequency fan (7) and a compressor (1), a four-way valve (2), a condenser (3), an electronic expansion valve (4), and an evaporator (5) connected in sequence.

3. The device for testing the heat exchange performance of a small air conditioning unit in a construction project according to claim 2, characterized in that: The humidifying device (6) is located between the evaporator (5) and the variable frequency fan (7).

4. The device for testing the heat exchange performance of a small air conditioning unit in a construction project according to claim 1, characterized in that: The temperature and humidity collection device comprises a temperature sensor, a humidity sensor, a pressure sensor, and one of a wind speed sensor and a heat flow meter fixed on the inner wall of the heat-insulating flexible air duct (8).

5. The device for testing the heat exchange performance of a small air conditioning unit in a construction project according to claim 1, characterized in that: It also includes a data control device (III), which includes a unit control module (12) and a device for collecting parameters of the equipment under test; The unit control module (12) is used to control the outlet air temperature, inlet air temperature and outlet air humidity of the test device for the heat exchange performance of the small air conditioning unit in the construction project; The device for collecting parameters of the device under test comprises a temperature, wind speed, and pressure collection device (10) and an electric power collection module (11); the temperature, wind speed, and pressure collection device (10) and the electric power collection module (11) are each electrically connected to the device under test via a wire.

6. The device for testing the heat exchange performance of a small air conditioning unit in a construction project according to claim 5, characterized in that: The equipment under test is a central air conditioner installed in a construction project.

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