Advanced control enthalpy difference chamber capable of customizing load input

Abstract

The invention relates to the technical field of air conditioner testing, in particular to an advanced control enthalpy difference chamber capable of customizing load input, which comprises an enthalpy difference test chamber consisting of an indoor side chamber and an outdoor side chamber. The dry-bulb temperature and humidity control of the indoor side chamber and the outdoor side chamber adopts a cascade control technology, and an air physical property calculation model is combined, so that the temperature and humidity control speed and precision of the enthalpy difference test chamber can be effectively improved, the temperature and humidity control stability of the enthalpy difference test chamber can be improved, and the control quality of the enthalpy difference test chamber is improved; switching modes of a first thermocouple temperature measuring point, a first platinum resistor temperature measuring point, a first wet bulb temperature measuring point, a first dew point temperature measuring point, a second thermocouple temperature measuring point, a second platinum resistor temperature measuring point, a second wet bulb temperature measuring point and a second dew point temperature measuring point are adjusted; the function of quickly switching the temperature measurement and control parameters of the indoor side chamber / the outdoor side chamber in a user-defined manner can be realized, so that the dry-bulb temperature of the indoor side chamber / the outdoor side chamber can be quickly regulated and controlled.

Description

Technical Field

[0001] The invention relates to the technical field of air conditioner testing, and in particular to an advanced controlled enthalpy difference chamber capable of user-defined load input. Background Art

[0002] Currently, the performance test standards and methods for room air conditioners are based on placing the unit under test in a constant temperature and humidity test chamber at a fixed operating point for performance testing. However, such test methods and environments are significantly different from the actual operating scenarios of room air conditioners. In addition, during the test, the room air conditioner is in locked frequency operation. Therefore, this test method cannot assess the variable frequency adjustment capability of the air conditioner and cannot well characterize and measure the actual performance of the air conditioner. In order to solve the problems existing in the current test methods, relevant institutions and scholars at home and abroad have proposed to test the performance of the unit under test by dynamically adjusting the temperature and humidity in the test chamber. However, there are differences in the calculation methods of dynamic indoor temperature and humidity. There is an urgent need for an enthalpy difference chamber with customizable load input to support the research of relevant test methods and standards. At the same time, these test methods often require rapid changes in indoor temperature and humidity, while traditional enthalpy difference chambers often use single-stage PID control, which cannot well meet the dynamic testing requirements.

[0003] To this end, this application provides an advanced controlled enthalpy difference chamber with customizable load input. Summary of the Invention

[0004] Based on this, it is necessary to provide an advanced controlled enthalpy difference chamber with customizable load input to address the above technical issues, aiming to provide laboratory solutions for dynamic test methods and standard research at home and abroad, and to solve the problems of poor speed and accuracy of temperature and humidity control in traditional enthalpy difference chambers.

[0005] The present invention provides an advanced controlled enthalpy difference chamber with customizable load input, comprising: an enthalpy difference test chamber, wherein the enthalpy difference test chamber is composed of an indoor chamber for providing a working environment for the indoor unit of the machine under test and an outdoor chamber for providing a working environment for the outdoor unit of the machine under test; the indoor chamber is provided with a first temperature control loop and a first humidity control loop, both of which adopt a first working condition machine system with cascade control, and the outer loop of the first working condition machine system adopts a custom load model control system, and the custom load model control system predicts and controls the dry-bulb temperature and humidity of the indoor chamber according to an air property calculation model; the outdoor chamber is provided with a second temperature control loop and a second humidity control loop, both of which adopt a second working condition machine system with cascade control, and the inner and outer loops of the second working condition machine system both adopt a direct control structure for directly controlling the dry-bulb temperature and humidity of the outdoor chamber.

[0006] Optionally, the indoor side chamber is also provided with an enthalpy difference air volume control device, which includes a sensible cooling capacity measuring structure of the measured unit and a latent cooling capacity measuring structure of the measured unit. The sensible cooling capacity measuring structure of the measured unit is used to actually measure the sensible cooling capacity of the indoor unit at the current moment, and the latent cooling capacity measuring structure of the measured unit is used to actually measure the latent cooling capacity of the indoor unit at the current moment.

[0007] Optionally, the indoor side chamber is also provided with a first cooling supply structure and a first heat supply structure. The output control quantity of the first cooling supply structure is the fixed cooling capacity input of the fixed-frequency refrigerator. When controlling the dry-bulb temperature of the indoor side chamber, the inner loop and outer loop of the first working condition machine system respectively adopt the first temperature inner loop PID controller and the first temperature outer loop PID controller. The input control quantity of the first temperature inner loop PID controller is the outlet temperature measurement value of the first working condition machine system, and the output control quantity of the first temperature inner loop PID controller is the power value of the first heat supply structure. The first temperature outer loop PID controller is adjusted according to the deviation between the air inlet temperature measurement value of the indoor unit and the indoor dry-bulb temperature setting value at the next moment calculated by the air property calculation model. The output control quantity of the first temperature outer loop PID controller is the temperature setting value of the first temperature inner loop PID controller.

[0008] Optionally, the air property calculation model includes an indoor side room temperature prediction model, and the calculation formula of the indoor side room temperature prediction model is: Where, Indicates the indoor dry-bulb temperature setting value at the next moment. Indicates the current indoor dry-bulb temperature setting value. Indicates the indoor temperature setting time interval, represents the indoor side chamber heat capacity, Indicates the sensible heat virtual load at the current moment. Indicates the sensible cooling capacity actually calculated by the indoor unit at the current moment; 、 and All are custom inputs. is the actual measured value; the indoor dry-bulb temperature set value at the next moment calculated by the indoor side room temperature prediction model is sent to the first temperature outer loop PID controller to realize the prediction control of the indoor side room dry-bulb temperature.

[0009] Optionally, the indoor side chamber is also provided with a first ambient air sampling device, which includes a first thermocouple temperature measuring point, a first platinum resistor temperature measuring point, a first wet-bulb temperature measuring point, a first dew point temperature measuring point and a first relative humidity measuring point. By adjusting the switching mode of the first thermocouple temperature measuring point, the first platinum resistor temperature measuring point, the first wet-bulb temperature measuring point and the first dew point temperature measuring point, the air inlet temperature measurement value of the indoor unit under different working conditions is collected, and the first relative humidity measurement point is used to collect the air inlet humidity measurement value of the indoor unit.

[0010] Optionally, the indoor side chamber is also provided with a first humidity supply structure. When controlling the humidity of the indoor side chamber, the inner loop and outer loop of the first working condition machine system respectively adopt a first humidity inner loop PID controller and a first humidity outer loop PID controller. The input control quantity of the first humidity inner loop PID controller is the outlet humidity measurement value of the first working condition machine system. The output control quantity of the first humidity inner loop PID controller is the humidification power or humidification amount of the first humidity supply structure. The first humidity outer loop PID controller is adjusted according to the deviation between the air inlet humidity measurement value of the indoor unit and the indoor relative humidity at the next moment calculated by the air property calculation model. The output control quantity of the first humidity outer loop PID controller is the humidity set value of the first humidity inner loop PID controller.

[0011] Optionally, the air property calculation model further includes an indoor side room relative humidity prediction model, and the calculation formula of the indoor side room relative humidity prediction model is: Where, Indicates the indoor relative humidity at the next moment, Indicates the current indoor relative humidity. Indicates the latent heat virtual load at the current moment, Indicates the actual latent cooling capacity of the indoor unit at the current moment. Indicates the indoor side chamber wet capacity, represents the latent heat of vaporization of water vapor; and All are custom inputs. is the actual measured value; the indoor specific humidity at the next moment calculated by the indoor side room specific humidity prediction model is sent to the first humidity outer loop PID controller to realize the predictive control of the indoor side room humidity.

[0012] Optionally, the direct control structure includes a second temperature inner loop PID controller and a second temperature outer loop PID controller. The outdoor chamber is also provided with a second cooling supply structure and a second heat supply structure. The output control quantity of the second cooling supply structure is the fixed cooling capacity input of the fixed frequency refrigerator. When controlling the dry-bulb temperature of the outdoor chamber, the inner loop and outer loop of the second working condition machine system respectively adopt the second temperature inner loop PID controller and the second temperature outer loop PID controller. The input control quantity of the second temperature inner loop PID controller is the outlet temperature measurement value of the second working condition machine system, and the output control quantity of the second temperature inner loop PID controller is the power value of the second heat supply structure. The second temperature outer loop PID controller is adjusted according to the deviation between the inlet temperature measurement value of the outdoor unit and the set temperature value. The output control quantity of the second temperature outer loop PID controller is the temperature set value of the second temperature inner loop PID controller.

[0013] Optionally, the direct control structure also includes a second humidity inner loop PID controller and a second humidity outer loop PID controller, and the outdoor side chamber is also provided with a second humidity supply structure. When controlling the humidity of the outdoor side chamber, the inner loop and outer loop of the second working condition machine system respectively adopt the second humidity inner loop PID controller and the second humidity outer loop PID controller. The input control quantity of the second humidity inner loop PID controller is the outlet humidity measurement value of the second working condition machine system, and the output control quantity of the second humidity inner loop PID controller is the humidification power or humidification amount of the second humidity supply structure. The second humidity outer loop PID controller is adjusted according to the deviation between the humidity measurement value of the air inlet of the outdoor unit and the set humidity value. The output control quantity of the second humidity outer loop PID controller is the humidity set value of the second humidity inner loop PID controller.

[0014] Optionally, the outdoor side chamber is also provided with a second ambient air sampling device, which includes a second thermocouple temperature measuring point, a second platinum resistor temperature measuring point, a second wet-bulb temperature measuring point, a second dew point temperature measuring point and a second relative humidity measuring point. By adjusting the switching mode of the second thermocouple temperature measuring point, the second platinum resistor temperature measuring point, the second wet-bulb temperature measuring point and the second dew point temperature measuring point, the air inlet temperature measurement value of the outdoor unit under different working conditions is collected, and the second relative humidity measurement point is used to collect the air inlet humidity measurement value of the outdoor unit.

[0015] The advantages and beneficial effects of the present invention are: the advanced controlled enthalpy difference chamber with customizable load input provided by the present invention, the dry-bulb temperature and humidity control of the indoor chamber and the outdoor chamber both adopt cascade control technology, combined with the air physical property calculation model, which can not only effectively improve the control speed and accuracy of the temperature and humidity of the enthalpy difference test room, but also improve the control stability of the temperature and humidity of the enthalpy difference test room, thereby improving the control quality of the enthalpy difference test room; at the same time, by adjusting the switching mode of the first thermocouple temperature measuring point, the first platinum resistance temperature measuring point, the first wet-bulb temperature measuring point, the first dew point temperature measuring point, the second thermocouple temperature measuring point, the second platinum resistance temperature measuring point, the second wet-bulb temperature measuring point and the second dew point temperature measuring point, the fast switching function of the customized indoor chamber / outdoor chamber temperature measurement and control parameters can be realized, so as to quickly adjust the dry-bulb temperature of the indoor chamber / outdoor chamber, which is suitable for the test requirements of different working conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of the indoor side chamber of the present invention.

[0017] Figure 2 It is a structural schematic diagram of the outdoor side chamber of the present invention.

[0018] Among them, the first working condition machine system 1, the first evaporator 2, the first fan 3, the first power regulator 4, the first electric heater 5, the first thermocouple matrix 6, the first steam spray rod 7, the first relative humidity meter 8, the first humidification system 9, the first cooling machine system 10, the first humidity inner loop PID controller 11, the first humidity outer loop PID controller 12, the first temperature inner loop PID controller 13, the first temperature outer loop PID controller 14, the custom load model control system 15, the measured machine sensible cooling capacity measurement structure 16, the measured machine latent cooling capacity measurement structure 17, the first thermocouple temperature measurement point 18, the first platinum resistance temperature measurement point 19, the first wet bulb temperature measurement point 20, the first relative humidity measurement point 21 , first dew point temperature measuring point 22, indoor unit 23, second operating machine system 24, second evaporator 25, second fan 26, second power regulator 27, second electric heater 28, second thermocouple matrix 29, second steam spray rod 30, second relative humidity meter 31, second humidification system 32, second chiller system 33, second humidity outer-loop PID controller 34, second humidity inner-loop PID controller 35, second temperature outer-loop PID controller 36, second temperature inner-loop PID controller 37, second dew point temperature measuring point 38, second relative humidity measuring point 39, second wet-bulb temperature measuring point 40, second platinum resistance temperature measuring point 41, second thermocouple temperature measuring point 42, outdoor unit 43. DETAILED DESCRIPTION

[0019] The embodiments of the present application will be described in detail below. Examples of the embodiments are shown in the accompanying drawings, where the same or similar reference numerals throughout represent the same or similar elements or elements with the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and are not to be construed as limitations on the present application. In addition, the following embodiments and features in the embodiments may be combined with each other unless there is a conflict. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present application.

[0020] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0021] The present application provides an advanced controlled enthalpy difference chamber with customizable load input, including: an enthalpy difference test chamber consisting of an indoor side chamber providing a working environment for the indoor unit 23 of the machine under test and an outdoor side chamber providing a working environment for the outdoor unit 43 of the machine under test.

[0022] In some optional implementations of the present application, the indoor side chamber is provided with a first temperature control loop and a first humidity control loop, both of which adopt a first operating condition machine system 1 with cascade control, and the outer loop of the first operating condition machine system 1 adopts a custom load model control system 15, and the custom load model control system 15 predicts and controls the dry-bulb temperature and humidity of the indoor side chamber according to the air physical property calculation model.

[0023] In some optional implementations of this application, please refer to the attached Figure 1 The indoor side room is also provided with an enthalpy difference air volume control device, which includes a measured unit sensible cooling capacity calculation structure 16 and a measured unit latent cooling capacity calculation structure 17. The measured unit sensible cooling capacity calculation structure 16 is used to actually calculate the sensible cooling capacity of the indoor unit 23 at the current moment, specifically for actually calculating The latent cooling capacity calculation structure 17 of the measured machine is used to actually calculate the latent cooling capacity of the indoor unit 23 at the current moment, specifically for actually calculating .

[0024] In some optional implementations of the present application, the indoor side chamber is also provided with a first cooling supply structure and a first heat supply structure. The output control quantity of the first cooling supply structure is the fixed cooling capacity input of the fixed-frequency refrigerator. When controlling the dry-bulb temperature of the indoor side chamber, the inner loop and outer loop of the first operating condition machine system 1 respectively adopt the first temperature inner loop PID controller 13 and the first temperature outer loop PID controller 14. The input control quantity of the first temperature inner loop PID controller 13 is the outlet temperature measurement value of the first operating condition machine system 1. The output control quantity of the first temperature inner loop PID controller 13 is the power value of the first heat supply structure. The first temperature outer loop PID controller 14 is adjusted according to the deviation between the air inlet temperature measurement value of the indoor unit 23 and the indoor dry-bulb temperature setting value at the next moment calculated by the air property calculation model. The output control quantity of the first temperature outer loop PID controller 14 is the temperature setting value of the first temperature inner loop PID controller 13.

[0025] In some optional implementations of this application, please refer to the attached Figure 1 The first cooling capacity supply structure includes a first refrigeration system 10 and a first evaporator 2 connected to the first refrigeration system 10. The indoor side chamber is supplied with cooling capacity through the first evaporator 2. Moreover, the first evaporator 2 is usually a fixed-frequency refrigeration machine with fixed cooling capacity. Therefore, it is only necessary to control the heat supply of the first heat supply structure to achieve the purpose of controlling the dry-bulb temperature of the indoor side chamber.

[0026] In some optional implementations of this application, please refer to the attached Figure 1 The first heat supply structure includes a first fan 3, a first power regulator 4 and a first electric heater 5 arranged in sequence from bottom to top. The first power regulator 4 and the first electric heater 5 are electrically connected. The indoor side chamber is supplied with heat through the first electric heater 5, and the amount of heat supplied by the first electric heater 5 is regulated by the first power regulator 4. Therefore, by accurately controlling the power compensation of the first power regulator 4 to the first electric heater 5, high-precision temperature control of the indoor side chamber can be achieved.

[0027] In some optional implementations of the present application, the air property calculation model includes an indoor side room temperature prediction model, and the calculation formula of the indoor side room temperature prediction model is: Where, Indicates the indoor dry-bulb temperature set value at the next moment, in °C; Indicates the current indoor dry-bulb temperature setting value in °C; Indicates the indoor temperature setting time interval, in seconds; Indicates the heat capacity of the indoor side chamber, in J / K; Indicates the current sensible heat virtual load, in W; represents the sensible cooling capacity actually calculated by the indoor unit 23 at the current moment, in W; 、 and All are custom inputs. the indoor side room temperature prediction model calculated by the next moment indoor dry-bulb temperature set value is sent to the first temperature outer loop PID controller 14 to achieve the indoor side room dry-bulb temperature prediction control.

[0028] It should be noted that and All are virtual building load input parameters.

[0029] In some optional implementations of the present application, the custom load model control system 15 is equipped with an air property calculation model, wherein the air property calculation model includes an indoor room temperature prediction model for predicting and controlling the indoor room dry bulb temperature, wherein: 、 and All are custom inputs, which can be customized according to the actual working condition test requirements. The actual measured value at the sensible cooling capacity measurement structure 16 of the machine under test is used to calculate the indoor dry-bulb temperature setting value at the next moment through the indoor side room temperature prediction model and send it to the first temperature outer loop PID controller 14. The outer loop of the first working condition machine system 1 is controlled to achieve the control of the indoor side room dry-bulb temperature.

[0030] In some optional implementations of the present application, the indoor side chamber is also provided with a first ambient air sampling device, which includes a first thermocouple temperature measuring point 18, a first platinum resistor temperature measuring point 19, a first wet-bulb temperature measuring point 20, a first dew point temperature measuring point 22 and a first relative humidity measuring point 21. By adjusting the switching mode of the first thermocouple temperature measuring point 18, the first platinum resistor temperature measuring point 19, the first wet-bulb temperature measuring point 20 and the first dew point temperature measuring point 22, the air inlet temperature measurement value of the indoor unit 23 under different working conditions is collected, and the first relative humidity measuring point 21 is used to collect the air inlet humidity measurement value of the indoor unit 23.

[0031] In some optional implementations of the present application, in order to apply the testing requirements of different working conditions, the switching modes of the first thermocouple temperature measurement point 18, the first platinum resistance temperature measurement point 19, the first wet-bulb temperature measurement point 20 and the first dew point temperature measurement point 22 can be adjusted to obtain the air inlet temperature measurement value of the indoor unit 23 under different working conditions, thereby realizing the rapid switching function of customized indoor side room temperature measurement and control parameters.

[0032] In some optional implementations of the present application, the dry-bulb temperature control of the indoor side chamber of the present application adopts cascade control technology, and the specific control method includes: collecting the outlet temperature measurement value of the first working condition machine system 1 as the input control quantity (i.e., feedback quantity) of the first temperature inner loop PID controller 13. The outlet temperature measurement value of the first working condition machine system 1 is not affected by the temperature transmission and diffusion lag process of the indoor side chamber space, which facilitates the first temperature inner loop PID controller 13 to respond quickly and adjust the temperature. The output control quantity of the first temperature inner loop PID controller 13 is the power value of the first electric heater 5, which can be achieved by controlling the first power regulator 4. At the same time, the outer loop of the first operating condition machine system 1 utilizes a first temperature outer-loop PID controller 14. This controller adjusts the system based on the deviation between the measured air inlet temperature of the indoor unit 23 and the next-moment indoor dry-bulb temperature setpoint calculated by the air property calculation model. It should be noted that the measured air inlet temperature of the indoor unit 23 is obtained by adjusting the switching pattern of the first thermocouple temperature measurement point 18, the first platinum resistance temperature measurement point 19, the first wet-bulb temperature measurement point 20, and the first dew point temperature measurement point 22. The output control variable of the first temperature outer-loop PID controller 14 is the temperature setpoint of the first temperature inner-loop PID controller 13. The next-moment indoor dry-bulb temperature setpoint calculated by the air property calculation model can be adjusted based on the dynamic temperature response and steady-state performance of the indoor side chamber under different operating conditions, as well as the hysteresis time parameter.

[0033] In some optional implementations of this application, please refer to the attached Figure 1 In order to collect the outlet temperature measurement value of the first working condition machine system 1, the indoor side chamber is further provided with a first thermocouple matrix 6, and the first thermocouple matrix 6 is arranged above the first electric heater 5.

[0034] In some optional implementations of the present application, the indoor side chamber is also provided with a first humidity supply structure. When controlling the humidity of the indoor side chamber, the inner loop and outer loop of the first working condition machine system 1 respectively adopt the first humidity inner loop PID controller 11 and the first humidity outer loop PID controller 12. The input control quantity of the first humidity inner loop PID controller 11 is the outlet humidity measurement value of the first working condition machine system 1, and the output control quantity of the first humidity inner loop PID controller 11 is the humidification power or humidification amount of the first humidity supply structure. The first humidity outer loop PID controller 12 is adjusted according to the deviation between the air inlet humidity measurement value of the indoor unit 23 and the indoor relative humidity at the next moment calculated by the air physical property calculation model. The output control quantity of the first humidity outer loop PID controller 12 is the humidity set value of the first humidity inner loop PID controller 11.

[0035] In some optional implementations of this application, please refer to the attached Figure 1The first humidity supply structure includes a first humidification system 9 and a first steam spray rod 7 connected to the first humidification system 9. The indoor side chamber is supplied with humidification steam through the first humidification system 9. Therefore, by accurately controlling the humidification power or humidification amount of the first humidification system 9, high-precision humidity control of the indoor side chamber can be achieved.

[0036] In some optional implementations of the present application, the air property calculation model further includes an indoor side room relative humidity prediction model, and the calculation formula of the indoor side room relative humidity prediction model is: Where, Indicates the indoor relative humidity at the next moment, in g / kg; Indicates the current indoor relative humidity in g / kg; Indicates the current latent heat virtual load, in W; Indicates the actual calculated latent cooling capacity of the indoor unit 23 at the current moment, in W; Indicates the indoor side chamber wet capacity, in kg; represents the latent heat of vaporization of water vapor, in J / kg; and All are custom inputs. is the actual measured value; the indoor relative humidity at the next moment calculated by the indoor side room relative humidity prediction model is sent to the first humidity outer loop PID controller 12 to achieve predictive control of the indoor side room humidity.

[0037] In some optional implementations of the present application, the air property calculation model further includes an indoor side room specific humidity prediction model for predicting and controlling the indoor side room humidity, wherein: and All are custom inputs, which can be customized according to the actual working condition test requirements. The actual measured value of the latent cooling capacity measurement structure 17 of the machine under test is used to calculate the indoor relative humidity at the next moment through the indoor side room relative humidity prediction model and send it to the first humidity outer loop PID controller 12. The outer loop of the first working condition machine system 1 is controlled to achieve the control of the indoor side room humidity.

[0038] In some optional implementations of the present application, the humidity control of the indoor side chamber of the present application utilizes a cascade control technique. The specific control method includes: collecting the outlet humidity measurement value of the first operating condition machine system 1 as the input control variable (i.e., feedback variable) of the first humidity inner-loop PID controller 11. The outlet humidity measurement value of the first operating condition machine system 1 is not affected by the hysteresis process of humidity transmission and diffusion in the indoor side chamber space, facilitating rapid response and humidity adjustment by the first humidity inner-loop PID controller 11. The output control variable of the first humidity inner-loop PID controller 11 is the humidification power or humidification capacity of the first humidification system 9. Simultaneously, the outer loop of the first operating condition machine system 1 utilizes a first humidity outer-loop PID controller 12. The first humidity outer-loop PID controller 12 adjusts the humidity based on the deviation between the inlet humidity measurement value of the indoor unit 23 and the next-moment indoor specific humidity calculated by the air property calculation model. It should be noted that the inlet humidity measurement value of the indoor unit 23 here is specifically obtained after collection at the first relative humidity measurement point 21. The output control variable of the first humidity outer-loop PID controller 12 is the temperature setpoint of the first humidity inner-loop PID controller 11. The indoor specific humidity at the next moment calculated by the air physical property calculation model can be adjusted according to the dynamic response and steady-state performance of the humidity in the indoor side chamber under different working conditions, as well as the hysteresis time parameter.

[0039] In some optional implementations of this application, please refer to the attached Figure 1 In order to collect the outlet humidity measurement value of the first working condition machine system 1, the indoor side chamber is also provided with a first relative humidity meter 8, and the first relative humidity meter 8 is arranged above the first steam spray rod 7.

[0040] In some optional implementations of the present application, the direct control structure includes a second temperature inner loop PID controller 37 and a second temperature outer loop PID controller 36, and the outdoor chamber is also provided with a second cooling supply structure and a second heat supply structure. The output control quantity of the second cooling supply structure is the fixed cooling capacity input of the fixed frequency refrigerator. When controlling the dry-bulb temperature of the outdoor chamber, the inner loop and outer loop of the second operating condition machine system 24 respectively adopt the second temperature inner loop PID controller 37 and the second temperature outer loop PID controller 36. The input control quantity of the second temperature inner loop PID controller 37 is the outlet temperature measurement value of the second operating condition machine system 24, and the output control quantity of the second temperature inner loop PID controller 37 is the power value of the second heat supply structure. The second temperature outer loop PID controller 36 is adjusted according to the deviation between the air inlet temperature measurement value of the outdoor unit 43 and the set temperature value. The output control quantity of the second temperature outer loop PID controller 36 is the temperature set value of the second temperature inner loop PID controller 37.

[0041] In some optional implementations of this application, please refer to the attached Figure 2The second cooling capacity supply structure includes a second refrigeration system 33 and a second evaporator 25 connected to the second refrigeration system 33. The outdoor room is supplied with cooling capacity through the second evaporator 25. Moreover, the second evaporator 25 is usually a fixed-frequency refrigeration machine with fixed cooling capacity. Therefore, it is only necessary to control the heat supply of the second heat supply structure to achieve the purpose of controlling the dry-bulb temperature of the outdoor room.

[0042] In some optional implementations of this application, please refer to the attached Figure 2 The second heat supply structure includes a second fan 26, a second power regulator 27 and a second electric heater 28 arranged from bottom to top. The second power regulator 27 and the second electric heater 28 are electrically connected. The outdoor chamber is supplied with heat through the second electric heater 28, and the amount of heat supplied by the second electric heater 28 is regulated by the second power regulator 27. Therefore, by accurately controlling the power compensation of the second electric heater 28 by the second power regulator 27, high-precision temperature control of the outdoor chamber can be achieved.

[0043] In some optional implementations of the present application, the outdoor side chamber is also provided with a second ambient air sampling device, which includes a second thermocouple temperature measuring point 42, a second platinum resistor temperature measuring point 41, a second wet-bulb temperature measuring point 40, a second dew point temperature measuring point 38 and a second relative humidity measuring point 39. By adjusting the switching mode of the second thermocouple temperature measuring point 42, the second platinum resistor temperature measuring point 41, the second wet-bulb temperature measuring point 40 and the second dew point temperature measuring point 38, the air inlet temperature measurement value of the outdoor unit 43 under different working conditions is collected, and the second relative humidity measuring point 39 is used to collect the air inlet humidity measurement value of the outdoor unit 43.

[0044] In some optional implementations of the present application, in order to apply the testing requirements of different working conditions, the switching modes of the second thermocouple temperature measuring point 42, the second platinum resistance temperature measuring point 41, the second wet-bulb temperature measuring point 40 and the second dew point temperature measuring point 38 can be adjusted to obtain the air inlet temperature measurement value of the outdoor unit 43 under different working conditions, thereby realizing the rapid switching function of customized outdoor side room temperature measurement and control parameters.

[0045] In some optional implementations of the present application, the dry-bulb temperature control of the outdoor chamber of the present application adopts cascade control technology, and the specific control method includes: collecting the outlet temperature measurement value of the second operating machine system 24 as the input control quantity (i.e., feedback quantity) of the second temperature inner loop PID controller 37. The outlet temperature measurement value of the second operating machine system 24 is not affected by the temperature transmission and diffusion lag process of the outdoor chamber space, which facilitates the second temperature inner loop PID controller 37 to respond quickly and adjust the temperature. The output control quantity of the second temperature inner loop PID controller 37 is the power value of the second electric heater 28, which can be achieved by controlling the second power regulator 27. At the same time, the outer loop of the second operating machine system 24 adopts the second temperature outer loop PID controller 36. The second temperature outer loop PID controller 36 adjusts the power value of the second electric heater 28 according to the deviation between the measured value of the air inlet temperature of the outdoor unit 43 and the set temperature value. It should be noted that the measured value of the air inlet temperature of the outdoor unit 43 here is obtained by adjusting the switching mode of the second thermocouple temperature measuring point 42, the second platinum resistance temperature measuring point 41, the second wet-bulb temperature measuring point 40 and the second dew point temperature measuring point 38; the output control quantity of the second temperature outer loop PID controller 36 is the temperature set value of the second temperature inner loop PID controller 37.

[0046] In some optional implementations of this application, please refer to the attached Figure 2 In order to collect the outlet temperature measurement value of the second working condition machine system 24 , the outdoor chamber is further provided with a second thermocouple matrix 29 , and the second thermocouple matrix 29 is arranged above the second electric heater 28 .

[0047] In some optional implementations of the present application, the direct control structure also includes a second humidity inner loop PID controller 35 and a second humidity outer loop PID controller 34, and the outdoor side chamber is also provided with a second humidity supply structure. When controlling the humidity of the outdoor side chamber, the inner loop and outer loop of the second working condition machine system 24 respectively adopt the second humidity inner loop PID controller 35 and the second humidity outer loop PID controller 34. The input control quantity of the second humidity inner loop PID controller 35 is the outlet humidity measurement value of the second working condition machine system 24, and the output control quantity of the second humidity inner loop PID controller 35 is the humidification power or humidification amount of the second humidity supply structure. The second humidity outer loop PID controller 34 is adjusted according to the deviation between the air inlet humidity measurement value of the outdoor unit 43 and the set humidity value. The output control quantity of the second humidity outer loop PID controller 34 is the humidity set value of the second humidity inner loop PID controller 35.

[0048] In some optional implementations of this application, please refer to the attached Figure 2The second humidity supply structure includes a second humidification system 32 and a second steam spray rod 30 connected to the second humidification system 32. The outdoor chamber is supplied with humidification steam through the second humidification system 32. Therefore, by accurately controlling the humidification power or humidification amount of the second humidification system 32, high-precision humidity control of the outdoor chamber can be achieved.

[0049] In some optional implementations of the present application, the humidity control of the outdoor side chamber of the present application adopts cascade control technology, and the specific control method includes: collecting the outlet humidity measurement value of the second working condition machine system 24 as the input control quantity (i.e., feedback quantity) of the second humidity inner loop PID controller 35. The outlet humidity measurement value of the second working condition machine system 24 is not affected by the humidity transmission and diffusion lag process of the outdoor side chamber space, which facilitates the second humidity inner loop PID controller 35 to respond quickly and adjust the humidity. The output control quantity of the second humidity inner loop PID controller 35 is the humidification power or humidification amount of the second humidification system 32. At the same time, the outer loop of the second working condition machine system 24 adopts the second humidity outer loop PID controller 34. The second humidity outer loop PID controller 34 adjusts the humidification power or humidification amount of the second humidification system 32 according to the deviation between the humidity measurement value of the air inlet of the outdoor unit 43 and the set humidity value. It should be noted that the humidity measurement value of the air inlet of the outdoor unit 43 here is specifically obtained after collection at the second relative humidity measuring point 39; the output control quantity of the second humidity outer loop PID controller 34 is the temperature setting value of the second humidity inner loop PID controller 35.

[0050] In some optional implementations of this application, please refer to the attached Figure 2 In order to collect the outlet humidity measurement value of the second working condition machine system 24, the outdoor side chamber is further provided with a second relative humidity meter 31, and the second relative humidity meter 31 is arranged above the second steam spray rod 30.

[0051] To sum up, the dry-bulb temperature and humidity control of the indoor and outdoor chambers of this application adopt a dual control loop design respectively. By combining the predictive controller with the machine room temperature prediction model, the control speed and accuracy of the temperature and humidity of the enthalpy difference test room can be effectively improved, and the control stability of the temperature and humidity of the enthalpy difference test room can be improved, thereby improving the control quality of the enthalpy difference test room.

[0052] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit it. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in the field should understand that the specific implementation methods of the present invention can still be modified or replaced by equivalents. Any modification or equivalent replacement that does not depart from the spirit and scope of the present invention should be covered by the scope of protection of the claims of the present invention.

Claims

1. Advanced controlled enthalpy difference chamber with customizable load input, characterized by: include: An enthalpy difference test chamber, the enthalpy difference test chamber consisting of an indoor chamber providing a working environment for the indoor unit of the device under test and an outdoor chamber providing a working environment for the outdoor unit of the device under test; The indoor side chamber is provided with a first temperature control loop and a first humidity control loop, both of which adopt a first working condition machine system of cascade control, and the outer loop of the first working condition machine system adopts a custom load model control system, and the custom load model control system predicts and controls the dry-bulb temperature and humidity of the indoor side chamber according to an air property calculation model; The outdoor chamber is provided with a second temperature control loop and a second humidity control loop. Both the second temperature control loop and the second humidity control loop adopt a second working condition machine system with cascade control. Both the inner loop and the outer loop of the second working condition machine system adopt a direct control structure to directly control the dry-bulb temperature and humidity of the outdoor chamber.

2. The advanced controlled enthalpy difference chamber with customizable load input according to claim 1, characterized in that: The indoor side chamber is also provided with an enthalpy difference air volume control device, which includes a sensible cooling capacity measuring structure of the measured unit and a latent cooling capacity measuring structure of the measured unit. The sensible cooling capacity measuring structure of the measured unit is used to actually measure the sensible cooling capacity of the indoor unit at the current moment, and the latent cooling capacity measuring structure of the measured unit is used to actually measure the latent cooling capacity of the indoor unit at the current moment.

3. The advanced controlled enthalpy difference chamber with customizable load input according to claim 2, characterized in that: The indoor side room is also provided with a first cooling capacity supply structure and a first heat supply structure. The output control quantity of the first cooling capacity supply structure is the fixed cooling capacity input of the fixed frequency refrigerator. When controlling the dry-bulb temperature of the indoor side room, the inner loop and outer loop of the first working condition machine system respectively adopt the first temperature inner loop PID controller and the first temperature outer loop PID controller. The input control quantity of the first temperature inner loop PID controller is the outlet temperature measurement value of the first working condition machine system, and the output control quantity of the first temperature inner loop PID controller is the power value of the first heat supply structure. The first temperature outer loop PID controller is adjusted according to the deviation between the air inlet temperature measurement value of the indoor unit and the indoor dry-bulb temperature setting value at the next moment calculated by the air property calculation model. The output control quantity of the first temperature outer loop PID controller is the temperature setting value of the first temperature inner loop PID controller.

4. The advanced controlled enthalpy difference chamber with customizable load input according to claim 3, characterized in that: The air property calculation model includes an indoor side room temperature prediction model, and the calculation formula of the indoor side room temperature prediction model is: Where, Indicates the indoor dry-bulb temperature setting value at the next moment. Indicates the current indoor dry-bulb temperature setting value. Indicates the indoor temperature setting time interval, represents the indoor side chamber heat capacity, Indicates the sensible heat virtual load at the current moment. Indicates the sensible cooling capacity actually calculated by the indoor unit at the current moment; in, 、 and All are custom inputs. is the actual measured value; The indoor dry-bulb temperature setting value at the next moment calculated by the indoor side room temperature prediction model is sent to the first temperature outer loop PID controller to realize the prediction control of the indoor side room dry-bulb temperature.

5. The advanced controlled enthalpy difference chamber with customizable load input according to claim 3, characterized in that: The indoor side chamber is also provided with a first ambient air sampling device, which includes a first thermocouple temperature measuring point, a first platinum resistance temperature measuring point, a first wet-bulb temperature measuring point, a first dew point temperature measuring point and a first relative humidity measuring point. By adjusting the switching mode of the first thermocouple temperature measuring point, the first platinum resistance temperature measuring point, the first wet-bulb temperature measuring point and the first dew point temperature measuring point, the air inlet temperature measurement value of the indoor unit under different working conditions is collected, and the first relative humidity measurement point is used to collect the air inlet humidity measurement value of the indoor unit.

6. The advanced controlled enthalpy difference chamber with customizable load input according to claim 5, characterized in that: The indoor side chamber is also provided with a first humidity supply structure. When controlling the humidity of the indoor side chamber, the inner loop and outer loop of the first working condition machine system respectively adopt the first humidity inner loop PID controller and the first humidity outer loop PID controller. The input control quantity of the first humidity inner loop PID controller is the outlet humidity measurement value of the first working condition machine system. The output control quantity of the first humidity inner loop PID controller is the humidification power or humidification amount of the first humidity supply structure. The first humidity outer loop PID controller is adjusted according to the deviation between the air inlet humidity measurement value of the indoor unit and the indoor relative humidity at the next moment calculated by the air property calculation model. The output control quantity of the first humidity outer loop PID controller is the humidity set value of the first humidity inner loop PID controller.

7. The advanced controlled enthalpy difference chamber with customizable load input according to claim 6, characterized in that: The air property calculation model also includes an indoor side room relative humidity prediction model, and the calculation formula of the indoor side room relative humidity prediction model is: Where, Indicates the indoor relative humidity at the next moment, Indicates the current indoor relative humidity. Indicates the latent heat virtual load at the current moment, Indicates the actual latent cooling capacity of the indoor unit at the current moment. Indicates the indoor side chamber wet capacity, represents the latent heat of vaporization of water vapor; in, and All are custom inputs. is the actual measured value; The indoor specific humidity at the next moment calculated by the indoor side room specific humidity prediction model is sent to the first humidity outer loop PID controller to realize the prediction control of the indoor side room humidity.

8. The advanced controlled enthalpy difference chamber with customizable load input according to claim 1, characterized in that: The direct control structure includes a second temperature inner loop PID controller and a second temperature outer loop PID controller. The outdoor room is also provided with a second cooling supply structure and a second heat supply structure. The output control quantity of the second cooling supply structure is the fixed cooling capacity input of the fixed frequency refrigerator. When controlling the dry bulb temperature of the outdoor room, the inner loop and outer loop of the second working condition machine system respectively adopt the second temperature inner loop PID controller and the second temperature outer loop PID controller. The input control quantity of the second temperature inner loop PID controller is the outlet temperature measurement value of the second working condition machine system, and the output control quantity of the second temperature inner loop PID controller is the power value of the second heat supply structure. The second temperature outer loop PID controller is adjusted according to the deviation between the inlet temperature measurement value of the outdoor unit and the set temperature value. The output control quantity of the second temperature outer loop PID controller is the temperature set value of the second temperature inner loop PID controller.

9. The advanced controlled enthalpy difference chamber with customizable load input according to claim 8, characterized in that: The direct control structure also includes a second humidity inner loop PID controller and a second humidity outer loop PID controller. The outdoor chamber is also provided with a second humidity supply structure. When controlling the humidity of the outdoor chamber, the inner loop and outer loop of the second working condition machine system respectively adopt the second humidity inner loop PID controller and the second humidity outer loop PID controller. The input control quantity of the second humidity inner loop PID controller is the outlet humidity measurement value of the second working condition machine system, and the output control quantity of the second humidity inner loop PID controller is the humidification power or humidification amount of the second humidity supply structure. The second humidity outer loop PID controller is adjusted according to the deviation between the humidity measurement value of the air inlet of the outdoor unit and the set humidity value. The output control quantity of the second humidity outer loop PID controller is the humidity set value of the second humidity inner loop PID controller.

10. The advanced controlled enthalpy difference chamber with user-defined load input according to claim 9, characterized in that: The outdoor side chamber is also provided with a second ambient air sampling device, which includes a second thermocouple temperature measuring point, a second platinum resistance temperature measuring point, a second wet-bulb temperature measuring point, a second dew point temperature measuring point and a second relative humidity measuring point. By adjusting the switching mode of the second thermocouple temperature measuring point, the second platinum resistance temperature measuring point, the second wet-bulb temperature measuring point and the second dew point temperature measuring point, the air inlet temperature measurement value of the outdoor unit under different working conditions is collected, and the second relative humidity measurement point is used to collect the air inlet humidity measurement value of the outdoor unit.

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