In-service air conditioner performance detection device and method

Abstract

The application discloses a kind of in-service air conditioner performance detection device and method.The device is composed of wind receiving chamber, exhaust chamber, return air chamber, differential pressure gauge, two mixers, heating wire and humidifier, return air temperature and humidity probe and return air motor.The device uses electric heating wire heat balance air conditioner refrigeration capacity, through heating and humidification method, air conditioner blows out the air to the detection required temperature and humidity state, and is connected to the return air opening of air conditioner, circulates and operates to reach stable state and has continuous condensate, uses electric energy meter to collect the electric energy of heating wire 1h, and synchronously collects the condensate amount generated by air conditioner 1h, according to the data collected, the performance of in-service air conditioner can be calculated, without disassembling air conditioner, avoid damage to in-service air conditioner.

Description

TECHNICAL FIELD

[0001] The embodiment of the present application relates to the technical field of air conditioner performance detection, in particular to an in-service air conditioner performance detection device and method. BACKGROUND

[0002] Old air conditioners often have a problem of a significant performance decline due to dirt, blockage and aging, at this time, the performance of the air conditioner needs to be detected to determine whether the performance indicators of the air conditioner meet the standard of replacing the air conditioner.

[0003] However, the traditional old air conditioner detection method is to disassemble the old air conditioner and send it to the laboratory for detection, which is time-consuming and laborious and needs to be repeatedly disassembled and assembled, which is easy to cause secondary damage to the air conditioner.

[0004] Therefore, it is urgent to provide an in-service air conditioner performance detection device and method which can accurately evaluate the performance level of the in-service air conditioner without disassembling the old air conditioner, and provide strong support for whether the air conditioner should be replaced. SUMMARY

[0005] The present application provides an in-service air conditioner performance detection device and method to detect the air conditioner by a scientific method without damaging the product.

[0006] In a first aspect, the embodiment of the present application provides an in-service air conditioner performance detection device, comprising:

[0007] a wind receiving chamber, a differential pressure gauge, and an air inlet port arranged on one side of the wind receiving chamber;

[0008] an air outlet chamber, a plurality of heating wires arranged in the air outlet chamber, and a humidifier;

[0009] a return air chamber, a return air temperature and humidity probe arranged in the return air chamber, a return air port arranged on one side of the return air chamber, and a return air fan arranged at the return air port; the return air temperature and humidity probe is used to detect the dry bulb temperature and the wet bulb temperature of the return air; a first PID controller, a second PID controller, and a third PID controller;

[0010] the first PID controller is connected with the differential pressure gauge, and is used to control the outlet air static pressure by adjusting the air volume of the return air fan;

[0011] the air inlet port is used to connect the air outlet of the air conditioner, and the return air port is used to connect the return air inlet of the air conditioner;

[0012] the second PID controller is connected with the return air dry bulb temperature probe, and is used to adjust the heating capacity of the plurality of heating wires to control the return air dry bulb temperature;

[0013] the third PID controller is connected with the return air wet bulb temperature probe, and is used to adjust the humidification capacity of the humidifier to control the return air wet bulb temperature.

[0014] Optionally, the wind receiving chamber is provided with a plurality of air pressure measuring points and a static pressure pipe, and the wind receiving chamber is connected to the differential pressure gauge through the static pressure pipe.

[0015] Optionally, the device further comprises a mixer arranged in the wind receiving chamber and used for mixing air conditioning outlet air temperature.

[0016] Optionally, the device further comprises a mixer arranged in the return air chamber and used for mixing required return air temperature and humidity.

[0017] In a second aspect, the embodiments of the present application further provide a method for detecting performance of an in-service air conditioner, which is implemented by using the in-service air conditioner performance detection device according to any of the above embodiments, and comprises the following steps.

[0018] The in-service air conditioner performance detection device is connected to an outlet port and a return air port of the air conditioner to be detected, and insulation measures are taken;

[0019] The outlet static pressure, the return air dry-bulb temperature and the return air wet-bulb temperature are set under a preset working condition, and the device is powered on and operated;

[0020] The air conditioner to be detected is operated, and when the air conditioner to be detected reaches a stable state and continuous condensate water is generated, the power consumption of a plurality of heating wires in 1 hour is measured E , the condensate water amount of the air conditioner in 1 hour G , and the outdoor unit return air outlet dry-bulb temperature T are measured.

[0021] The refrigerating capacity of the air conditioner under the Tcondensation temperature is calculated according to the power consumption of the plurality of heating wires in 1 hour E , the condensate water amount of the air conditioner in 1 hour G , and the outdoor unit return air outlet dry-bulb temperature T.

[0022] Optionally, the preset working condition is that the outlet static pressure is set to 0 Pa, the return air dry-bulb temperature is set to 27℃, and the return air wet-bulb temperature is set to 19℃.

[0023] Optionally, the refrigerating capacity of the air conditioner under the Tcondensation temperature is:

[0024]

[0025] wherein, E is the power consumption of the plurality of heating wires in 1 hour; G is the condensate water amount of the air conditioner in 1 hour; k is the latent heat of vaporization of water, k=(2501-2.38t1)×10 3 J / kg , t1 is the temperature of the condensate water, and t is 1 hour.

[0026] Optionally, the refrigerating capacity under a 35℃ condensation temperature is calculated according to the refrigerating capacity of the air conditioner under the Tcondensation temperature, and the calculation formula is:

[0027]

[0028] K is 0.03-0.05.

[0029] The application provides a kind of in-service air conditioner performance detection device, with electric heating wire heat balance air conditioner refrigeration capacity, by heating and humidification method, air conditioner blows out air is regulated to the temperature and humidity state required for detection, and is connected to the return air port of air conditioner, circulates and operates to reach stable state and has continuous condensate, with electric energy meter acquisition heating wire 1h Electric energy, and simultaneously acquisition 1h The condensate amount generated by air conditioner, according to the data collected, the performance of in-service air conditioner can be calculated, without disassembling air conditioner, avoid damage to in-service air conditioner. BRIEF DESCRIPTION OF DRAWINGS

[0030] Figure 1 The structure schematic view of the in-service air conditioner performance detection device provided by the embodiment of the application is shown in the figure.

[0031] Figure 2 The structure schematic view of the in-service air conditioner performance detection device provided by the embodiment of the application is shown in the figure. Figure 1 The structure schematic view of the in-service air conditioner performance detection device provided by the embodiment of the application is shown in the figure.

[0032] Figure 3 The structure schematic view of the in-service air conditioner performance detection device provided by the embodiment of the application is shown in the figure. Figure 1 The structure schematic view of the in-service air conditioner performance detection device provided by the embodiment of the application is shown in the figure. DETAILED DESCRIPTION

[0033] The application will be further described in detail below in conjunction with the drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the application, and not to limit the application. In addition, it should be noted that, in order to facilitate the description, only the parts related to the application are shown in the drawings, not all structures. EMBODIMENT

[0034] Figure 1 The structure schematic view of the in-service air conditioner performance detection device provided by the embodiment of the application is shown in the figure. Specifically, the device comprises: wind receiving chamber, differential pressure gauge, air inlet port arranged on one side of wind receiving chamber, mixer arranged in wind receiving chamber; air exhaust chamber, multiple groups of heating wires and humidifier arranged in air exhaust chamber; return air chamber, return air temperature and humidity probe arranged in return air chamber, return air port arranged on one side of return air chamber, mixer arranged in return air chamber, and return air motor arranged at return air port; first PID controller, second PID controller and third PID controller.

[0035] Further referring to Figure 2 , a plurality of air pressure measuring points and static pressure tubes are arranged around the wind receiving chamber, and the static pressure tubes are connected to the differential pressure gauge.

[0036] The air inlet port is used for connecting an air outlet of an air conditioner, the air return port is used for connecting an air return outlet of the air conditioner, and the air return temperature and humidity probe is used for detecting the temperature and humidity of the air return.

[0037] The first PID controller is connected with the differential pressure gauge, and is used for controlling the static pressure of the air outlet by adjusting the air volume of the air return motor.

[0038] The second PID controller is connected with the dry-bulb temperature probe of the air return, and is used for adjusting the heating amount of the multiple groups of heating wires to control the dry-bulb temperature of the air return.

[0039] The third PID controller is connected with the wet-bulb temperature probe of the air return, and is used for adjusting the humidifying amount of the humidifier to control the wet-bulb temperature of the air return.

[0040] Since the temperature of the air blown out by the air conditioner is not uniform, the embodiment is provided with two mixers to mix the air, so that the air state at each position in the air duct is uniform and consistent.

[0041] Further, on the basis of the above embodiment, the application further provides a method for detecting the performance of an in-service air conditioner, the core of which is to balance the refrigerating capacity of the air conditioner by the heating amount of the electric heating wires, to adjust the air blown out by the air conditioner to the required temperature and humidity state for detection, to connect to the air return outlet of the air conditioner, to run in a cycle to reach a stable state and to continuously generate condensed water, to collect the electric energy of the heating wires for 1 hour by using an electric energy meter, to synchronously collect the condensed water amount generated by the air conditioner for 1 hour, and then to calculate the performance of the in-service air conditioner according to the collected data.

[0042] Specifically, the method comprises the following steps:

[0043] Step 1, connecting the in-service air conditioner performance detection device to the air inlet and outlet of the air conditioner and taking good insulation measures;

[0044] Step 2, controlling the first PID controller to make the static pressure of the air outlet 0Pa, controlling the second PID controller to make the dry-bulb temperature 27℃ (standard working condition), controlling the third PID controller to make the wet-bulb temperature 19℃ and powering on to run;

[0045] Step 3, running the measured air conditioner, when the measured air conditioner runs to reach a stable state and continuously generates condensed water, measuring the power consumption of the multiple groups of heating wires for 1 hour E , the condensed water amount of the air conditioner for 1 hour G and the dry-bulb temperature T of the air return outlet of the outdoor unit;

[0046] Step 4, calculating the refrigerating capacity of the air conditioner under the T-condensing temperature according to the power consumption of the multiple groups of heating wires for 1 hour E , the condensed water amount of the air conditioner for 1 hour G and the dry-bulb temperature T of the air return outlet of the outdoor unit, and the calculation formula is:

[0047] (1)

[0048] wherein: Q 1 is the cooling capacity of the air conditioner at Tcondensing, in kilowatts (kW);

[0049] E is the power consumption of the multiple groups of heating wires, in kilowatt-hours (kWh);

[0050] t is time, which is 1 hour, in hours (h);

[0051] k is the latent heat of vaporization of water, in joules per kilogram (J / kg), which is determined by the temperature and pressure of the air conditioner evaporator (refrigeration side) and can be obtained from the commonly used empirical formula k = (2501 - 2.38t1) x 10 3 , where t1 is the temperature of the condensed water.

[0052] G is the amount of condensed water for the air conditioner in 1 hour, in kilograms (kg).

[0053] The following is the process of deriving the cooling capacity of the air conditioner at Tcondensing:

[0054] Q 1 = q v · M r · v1 (2)

[0055] wherein q v is the unit volume refrigeration capacity, in kilojoules per cubic meter (kJ / m³);

[0056] M r is the mass flow rate of the refrigerant, in kilograms per second (kg / s);

[0057] v1 is the specific volume of the gaseous refrigerant at the inlet of the compressor, in cubic meters per kilogram (m 3 / kg);

[0058] v1 = V / M = 1 / ρ (3)

[0059] V is the volume of the refrigerant vapor, in cubic meters (m 3 );

[0060] M is the mass of the refrigerant vapor, in kilograms (kg);

[0061] ρ is the density, which is determined by the temperature, in (m 3 / kg);

[0062] M r = η · V c · N / v1 (4)

[0063] η is the volumetric efficiency of the compressor;

[0064] V c For the theoretical displacement of the compressor, the fixed parameters of the compressor, unit (m 3 / s) ;

[0065] N is the rotational speed of the compressor, unit (r / s) ;

[0066] (5)

[0067] In the formula:

[0068] C C is the constant of the compressor type, C≈0.01~0.02 when the compressor type is centrifugal, and C≈0.03~0.05 when the compressor type is piston.

[0069] P 冷凝 And P 蒸发 It can be obtained according to the refrigerant property table.

[0070] Cp is the adiabatic coefficient, which is a characteristic parameter of the refrigerant, and can be checked.

[0071] (6)

[0072] In the formula:

[0073] h 入 is the specific enthalpy of the refrigerant at the inlet of the evaporator, unit kilojoule per kilogram (kJ / kg) ;

[0074] h 出 is the specific enthalpy of the refrigerant at the outlet of the evaporator, unit kilojoule per kilogram (kJ / kg) ;

[0075] V is the specific volume of the compressor suction port, unit cubic meters per kilogram (kg / m 3 ) ;

[0076] h 入 and h 出 , and can be obtained through the refrigerant thermodynamic property table or software (such as REFPROP).

[0077] From the above formulas (1)~(6), the formula of the refrigerating capacity of the air conditioner at Tcondensing temperature can be obtained:

[0078] (7)

[0079] r= P 冷凝 / P 蒸发 ;

[0080] The refrigerating capacity of the air conditioner at the condensing temperature T can be obtained by formula (1) Q 1. The refrigerating capacity of the air conditioner at the condensing temperature 35℃ is calculated according to formula (7) Q 2:

[0081] (8)

[0082] Wherein, η1 and η2 are the volumetric efficiency of the compressor at the condensing temperature T and 35℃ respectively, see formula (5).

[0083] Q 1 and Q 2 are the refrigerating capacity of the air conditioner at the condensing temperature T and the refrigerating capacity of the air conditioner calculated at the condensing temperature 35℃ respectively, in kilowatt (kW).

[0084] q v1 、 q v2 are the unit volumetric refrigerating capacity (kJ / m³) at the condensing temperature T and 35℃ respectively, see formula (6).

[0085] Simplified empirical formula:

[0086] (9)

[0087] K is usually 0.03-0.05, and the intermediate value 0.04 is generally taken.

[0088] T is the given temperature condition of the condenser side (radiator) of the air conditioner, and is generally 27℃-45℃.

[0089] Note that the above is only the preferred embodiment of the present application and the technical principle applied. Those skilled in the art will understand that the present application is not limited to the specific embodiments described herein, and those skilled in the art can make various obvious changes, re-adjustments and substitutions without departing from the scope of the present application. Therefore, although the present application has been described in more detail through the above embodiments, the present application is not limited to the above embodiments, and can include more other equivalent embodiments without departing from the concept of the present application, and the scope of the present application is determined by the scope of the appended claims.

Claims

1. An in-service air conditioner performance detection device, characterized by, include: The air receiving chamber, the differential pressure gauge, and the air inlet port located on one side of the air receiving chamber; Exhaust chamber, multiple heating elements and humidifier installed inside the exhaust chamber; The return air chamber, a return air temperature and humidity probe installed in the return air chamber, a return air port installed on one side of the return air chamber, and a return air motor installed at the return air port; the return air temperature and humidity probe is used to detect the dry-bulb temperature and wet-bulb temperature of the return air. First PID controller, second PID controller and third PID controller; The first PID controller is connected to the differential pressure gauge and is used to control the outlet static pressure by adjusting the air volume of the return air motor; The air inlet port is used to connect to the air conditioner outlet, and the air return port is used to connect to the air conditioner return outlet. The second PID controller is connected to the return air dry bulb temperature probe and is used to adjust the heat output of multiple heating wires to control the return air dry bulb temperature. The third PID controller is connected to the return air wet bulb temperature probe and is used to adjust the humidification amount of the humidifier to control the return air wet bulb temperature. The testing method of the in-service air conditioner performance testing device includes: Connect the in-service air conditioner performance testing device to the air outlet and return air outlet of the air conditioner under test and take insulation measures. Set the outlet static pressure, return air dry bulb temperature, and return air wet bulb temperature to preset operating conditions and power on; the preset operating conditions are: set the outlet static pressure to 0 Pa, the return air dry bulb temperature to 27 °C, and the return air wet bulb temperature to 19 °C. Running the air conditioner to be tested, when the air conditioner to be tested runs to a steady state and has continuous condensate water produced, measuring the power consumption of multiple groups of heating wires 1h E , the condensate water amount of the air conditioner 1h G and the condensing temperature T; According to the power consumption of the plurality of groups of heating wires 1h E And the condensate water amount of the air conditioner 1h G Calculate the refrigerating capacity of the air conditioner at the condensing temperature T; The formula for calculating the cooling capacity of an air conditioner at a condensing temperature T is: ； wherein, E the power consumption of the plurality of heating wires 1h; G the condensate amount of the air conditioner 1h; k is the latent heat of vaporization of water, k = (2501 - 2.38t1) x 10 3 J / kg, t1 is the temperature of the condensate, and t is 1 hour.

2. The apparatus of claim 1, wherein, The air receiving chamber is equipped with several air pressure measuring points and static pressure pipes around its perimeter, and the air receiving chamber is connected to the differential pressure gauge through the static pressure pipes.

3. The apparatus of claim 1, wherein, Also includes: A mixer installed in the air receiving chamber is used to mix the air outlet temperature of the air conditioner.

4. The apparatus according to claim 1, characterized in that, Also includes: A mixer installed in the return air chamber is used to mix the required return air temperature and humidity.

5. A method for testing the performance of an in-service air conditioner, implemented using the in-service air conditioner performance testing device as described in any one of claims 1-4, characterized in that, include: Connect the in-service air conditioner performance testing device to the air outlet and return air outlet of the air conditioner under test and take insulation measures. Set the outlet static pressure, return air dry bulb temperature, and return air wet bulb temperature to preset operating conditions and power on; the preset operating conditions are: set the outlet static pressure to 0 Pa, the return air dry bulb temperature to 27 °C, and the return air wet bulb temperature to 19 °C. Run the air conditioner under test. Once the air conditioner reaches a stable operating state and continuous condensation is produced, measure the power consumption of multiple heating elements over 1 hour. E 1 hour condensate volume of air conditioner G And the condensation temperature T; Based on the power consumption of the multiple sets of heating wires in 1 hour E Condensate volume of air conditioner in 1 hour G Calculate the cooling capacity of the air conditioner at the condensing temperature T; The formula for calculating the cooling capacity of an air conditioner at a condensing temperature T is: ； in, E The power consumption of multiple heating wires in 1 hour; G The condensate volume of the air conditioner in 1 hour is given by t; k is the latent heat of vaporization of water, k = (2501 - 2.38t1) × 10 3 J / kg, t1 is the temperature of the condensate, and t is 1 hour.

6. The method according to claim 5, characterized in that, The cooling capacity of an air conditioner at a condensing temperature of 35℃ is calculated based on the cooling capacity at the condensing temperature T. The formula is as follows: ； The value of K ranges from 0.03 to 0.05.

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