A non-destructive testing device for the performance of in-service air conditioners

Abstract

This utility model discloses a non-destructive testing device for the performance of an in-service air conditioner. The device includes: an insulated box for enclosing the air outlet and return air inlet of the air conditioner; an electric heating device positioned on the airflow from the air outlet to balance the cooling capacity of the air conditioner through heat generation; a power meter located outside the insulated box to detect the power consumption of the electric heating device; a return air temperature probe positioned at the center of the return air inlet to measure the return air temperature; a PID controller connected to the return air temperature probe and located outside the insulated box to control the output ratio of the electric heating wire based on the return air temperature; and an ambient temperature probe located outside the room where the indoor unit of the air conditioner is located to measure the outdoor atmospheric temperature. This utility model's testing device balances the cooling capacity of the air conditioner through heat generated by the electric heating device and measures heat leakage from the insulated box, allowing for the measurement of the air conditioner's cooling capacity without disassembling the air conditioner.

Description

Technical Field

[0001] This utility model relates to the field of in-service air conditioner performance testing technology, and in particular to a non-destructive testing device for in-service air conditioner performance. Background Technology

[0002] Currently, a large number of old air conditioners are still in use in my country. These old air conditioners have high energy consumption and often experience significant performance degradation due to dirt, blockages, and aging. In such cases, it is necessary to perform performance testing on the air conditioner to determine whether its various performance indicators meet the standards for replacement.

[0003] However, the traditional method of testing old air conditioners involves disassembling them and sending them to a laboratory for testing. This method is time-consuming, labor-intensive, and requires repeated disassembly and reassembly, which can easily cause secondary damage. Therefore, there is an urgent need for a device that can accurately assess the performance level of in-service air conditioners without disassembling them, providing strong support for the replacement of old air conditioners. Utility Model Content

[0004] This invention provides a non-destructive testing device for the performance of in-service air conditioners, avoiding secondary damage caused by disassembling the air conditioner for testing and improving the accuracy of test results.

[0005] This utility model provides a non-destructive testing device for the performance of in-service air conditioners, comprising:

[0006] An insulated box is a closed space constructed of insulated panels, used to enclose the air outlet and return air inlet of an air conditioner.

[0007] An electric heating device is installed on the airflow at the air outlet of the air conditioner to balance the cooling capacity of the air conditioner by generating heat.

[0008] A power meter, installed outside the insulation box, is used to detect the power consumption of the electric heating device;

[0009] The return air temperature probe is located at the center of the air conditioner's return air vent and is used to measure the temperature of the air conditioner's return air vent.

[0010] A PID controller, connected to the return air temperature probe and installed outside the insulation box, is used to collect the air conditioner return air temperature measured by the return air temperature probe and control the output ratio of the electric heating wire according to the air conditioner return air temperature.

[0011] An ambient temperature probe is installed outside the room where the indoor unit of the air conditioner is located to measure the outdoor atmospheric temperature.

[0012] Optionally, the electric heating device is an electric heating wire with adjustable power.

[0013] Optionally, the horizontal distance L1 between the air conditioner's air outlet and the electric heating device satisfies the following conditions:

[0014]

[0015] m1 and n1 are the length and width of the air conditioner vent, respectively.

[0016] Optionally, the horizontal distance L2 between the electric heating device and the side wall of the insulation box satisfies the following conditions:

[0017]

[0018] m2 and n2 are the length and width of the electric heating device, respectively.

[0019] Optionally, the horizontal distance L3 between the air conditioner return air vent and the side wall of the insulation box meets the following conditions:

[0020]

[0021] m1 and n1 are the length and width of the air conditioner vent, respectively.

[0022] This utility model provides a non-destructive testing device for the performance of an in-service air conditioner. The device uses an insulated box to enclose the air outlet and return air inlet of the air conditioner. The insulated box is equipped with an electric heating device and a return air temperature probe. The outside of the insulated box is equipped with a power meter, a PID controller and an ambient temperature probe. The heat generated by the electric heating device balances the cooling capacity of the air conditioner and measures the heat leakage of the insulated box. The cooling capacity of the air conditioner can be measured without disassembling the air conditioner. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments of this utility model will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the content of the embodiments of this utility model and these drawings without creative effort.

[0024] Figure 1 A structural diagram of an in-service air conditioner performance non-destructive testing device provided by this utility model;

[0025] Figure 2 This is a schematic diagram illustrating the connection method between a PID controller and a power meter provided by this utility model. Detailed Implementation

[0026] To make the technical problems solved by this utility model, the technical solutions adopted, and the technical effects achieved clearer, the technical solutions of the embodiments of this utility model will be further described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0027] Example

[0028] See Figure 1 and Figure 2 This utility model provides a non-destructive testing device for the performance of in-service air conditioners, comprising:

[0029] Insulated box 1 is an enclosed space constructed from insulation panels, used to enclose the air outlet and return air inlet of the air conditioner.

[0030] An electric heating device 2 is installed on the air outlet 3 above the airflow, and is used to balance the cooling capacity of the air conditioner by generating heat. In this embodiment, the electric heating device can be multiple sets of electric heating wires with adjustable power.

[0031] Power meter 4 is installed outside the insulation box to detect the power consumption of the electric heating device.

[0032] The return air temperature probe 5 is located at the center of the air conditioner's return air vent 6 and is used to measure the temperature of the air conditioner's return air vent.

[0033] The PID controller 7 is connected to the return air temperature probe and is located outside the insulation box. It is used to collect the air conditioner return air temperature measured by the return air temperature probe and control the output ratio of the electric heating wire according to the air conditioner return air temperature.

[0034] Ambient temperature probe 8 is installed outside the room where the indoor unit of the air conditioner is located to measure the outdoor ambient temperature.

[0035] This utility model utilizes equipment such as insulation boards, temperature probes, adjustable-power electric heating wires, and PID controllers to construct a system... Figure 1 The insulated chamber test system shown uses an air conditioner to heat the cold air blown out by an air conditioner through an electric heating wire before it flows back to the air conditioner's return air vent. This cycle continues until the temperature at the return air vent stabilizes at 27℃±0.5℃. The heat generated by the electric heating wire balances the cooling capacity of the air conditioner (the heat loss from the test chamber also needs to be considered). In this way, the cooling capacity of the air conditioner can be obtained by summing the electrical energy generated by the heating wire and the energy lost by the heat loss from the test chamber, thus achieving the goal of testing the air conditioner's performance without disassembling it.

[0036] Furthermore, in order to minimize wind resistance, the test system in this embodiment requires the following conditions to be met in the arrangement of each component:

[0037] The horizontal distance L1 between the air outlet of the air conditioner and the electric heating element satisfies the following condition:

[0038]

[0039] m1 and n1 are the length and width of the air conditioner vent, respectively.

[0040] The horizontal distance L2 between the electric heating device and the side wall of the insulation box located on the opposite side of the air conditioner satisfies the following conditions:

[0041]

[0042] m2 and n2 are the length and width of the electric heating device, respectively.

[0043] The horizontal distance L3 between the air conditioner's return air vent and the side wall of the insulation box located on the opposite side of the air conditioner satisfies the following conditions:

[0044]

[0045] m1 and n1 are the length and width of the air conditioner vent, respectively.

[0046] The above-mentioned distances were set using empirical formulas from fluid mechanics in air conditioning engineering to ensure uniform flow velocity and stable flow within the test chamber, and to prevent the generation of eddies, dead zones, and airflow short circuits.

[0047] Based on the above embodiments, the measurement process of this testing system includes the following steps:

[0048] Step 1, according to Figure 1 Set up the testing system.

[0049] Step 2: Set the return air temperature of the PID controller to 27℃.

[0050] Step 3: Run the air conditioner and wait for the return air temperature to stabilize within the range of 27℃±0.5℃ for 10 minutes.

[0051] Step 4: Turn on the power meter to collect the power consumption of multiple heating wires for 1 hour, and record it as E. At the same time, collect the indoor ambient temperature and the outdoor unit return air temperature, and record them as T1 and T respectively.

[0052] Step 5: Measure the surface area of ​​the test chamber and record it as S.

[0053] The cooling capacity Q1 of the air conditioner at temperature T is calculated using formula 1):

[0054]

[0055] In the formula:

[0056] Q1 represents the cooling capacity of the air conditioner, in kilowatts (kW).

[0057] E represents the power consumption of multiple heating wires, expressed in kilowatt-hours (kW·h).

[0058] t represents a time of 1 hour, expressed in hours (h).

[0059] Q 漏 The heat transferred through the insulation board is measured in kilowatts (kW).

[0060] The following is Q 漏 Measurement:

[0061] An insulated chamber was constructed using the same insulation board, and an adjustable electric heating wire was placed inside. The chamber temperature was set to 27°C, and the ambient temperature to 30°C. The temperature was maintained stable for 2 hours. The power consumption e of the electric heating in the last hour was recorded. The internal surface area s of the insulated chamber was measured, and the average heat leakage coefficient K of the test chamber was calculated according to the following formula:

[0062]

[0063] In the formula:

[0064] K is the heat transfer coefficient of the insulation board, in W / m². 2 ·k;

[0065] e represents the power consumption for 1 hour of electric heating, in Wh.

[0066] s is the internal surface area of ​​the insulated box, in meters. 2 ;

[0067] The heat loss during the cooling operation of the air conditioner is calculated as follows:

[0068]

[0069] In the formula:

[0070] S represents the surface area of ​​the test chamber, in meters. 2 ;

[0071] T1 is the indoor ambient temperature, in °C;

[0072] The following is an empirical formula for the cooling capacity of an air conditioner at a condensing temperature T:

[0073] Q2 = Q1·[1-K·(T-35)] (4)

[0074] In the formula:

[0075] Q1 and Q2 represent the cooling capacity of the air conditioner at condensing temperature T and the calculated cooling capacity of the air conditioner at condensing temperature 35℃, respectively, in kilowatts (kW).

[0076] K is usually between 0.03 and 0.05, with the average value of 0.04 being the middle value.

[0077] T represents the condensing temperature during the air conditioner performance test, in °C, with a range of 30℃-40℃.

[0078] By comparing the cooling capacity measured by the testing system with the cooling capacity calculated by empirical formulas, the performance of the air conditioner under test can be obtained.

[0079] Note that the above description is merely a preferred embodiment of the present invention and the technical principles employed. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and various obvious changes, readjustments, and substitutions can be made without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments, and may include many other equivalent embodiments without departing from the concept of the present invention. The scope of the present invention is determined by the scope of the appended claims.

Claims

1. An in-service air conditioner performance non-destructive testing device, characterized in that, include: An insulated box is a closed space constructed of insulated panels, used to enclose the air outlet and return air inlet of an air conditioner. An electric heating device is installed on the airflow at the air outlet of the air conditioner to balance the cooling capacity of the air conditioner by generating heat. A power meter, installed outside the insulation box, is used to detect the power consumption of the electric heating device; The return air temperature probe is located at the center of the air conditioner's return air vent and is used to measure the temperature of the air conditioner's return air vent. A PID controller, connected to the return air temperature probe and installed outside the insulation box, is used to collect the air conditioner return air temperature measured by the return air temperature probe and control the output ratio of the electric heating wire according to the air conditioner return air temperature. An ambient temperature probe is installed outside the room where the indoor unit of the air conditioner is located to measure the outdoor atmospheric temperature.

2. The non-destructive testing device for in-service air conditioner performance according to claim 1, characterized in that, The electric heating device is an electric heating wire with adjustable power.

3. The non-destructive testing device for in-service air conditioner performance according to claim 1, characterized in that, The horizontal distance L1 between the air outlet of the air conditioner and the electric heating element satisfies the following condition: m1 and n1 are the length and width of the air conditioner vent, respectively.

4. The non-destructive testing device for in-service air conditioner performance according to claim 1, characterized in that, The horizontal distance L2 between the electric heating device and the sidewall of the insulation box satisfies the following condition: m2 and n2 are the length and width of the electric heating device, respectively.

5. The non-destructive testing device for in-service air conditioner performance according to claim 1, characterized in that, The horizontal distance L3 between the air conditioner's return air vent and the side wall of the insulation box meets the following conditions: m1 and n1 are the length and width of the air conditioner vent, respectively.

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