DYLR-WS constant temperature and humidity unit system training device
Release time：2024-06-18 10:00viewed：times
1. Overview
The constant temperature and humidity unit system experimental device adopts a direct current *r treatment system and is equipped with real components such as compressors, *r-cooled condensers, evaporators, humidifiers, electric heaters and *r ducts. It can measure process parameters such as pressure, temperature, and humidity. Through the experiment of this device, students can become familiar with the *r treatment process of the direct current system and get basic tr*ning in thermal measurement and calculation. This device is suitable for experimental teaching of courses such as " Principles and Applications of Refrigeration and Air Conditioning", "Refrigeration and Air Conditioning Technology", and " Building Electrical Control Technology".
2. Device Features
1. Complete safety protection: It is equipped with voltage leakage protection, current leakage protection, overcurrent protection, overload protection, and grounding protection, which can effectively protect people and equipment.
2. Good intuitiveness: The device intuitively displays the structure of the constant temperature and humidity unit *r conditioning system. The *r duct uses a plexiglass panel, and the components of the *r circulation system can be clearly seen.
3. The constant temperature and humidity *r conditioner adopts a large *r volume and low enthalpy difference *r supply method to m*nt*n a small temperature and humidity uniformity. Ordinary household *r conditioners strive for comfort in *r supply. The *r supply volume of a general constant temperature and humidity *r conditioner is 2 to 3 times that of an ordinary household *r conditioner.
4. Due to the rapid change in humidity, the unit needs to be dehumidified frequently, and the constant temperature and humidity *r conditioner adopts a refrigeration and dehumidification method, so the *r conditioning refrigeration system is required to be started frequently, which places very high demands on the refrigeration system; and the household *r conditioner compressor cannot be started frequently, and a three-minute compressor shutdown protection is set.
5. The refrigeration flow chart of the constant temperature room and humidity unit is sprayed on the panel of the experimental table
. 6. Two throttling methods are adopted: 1. Manual throttling, 2. Capillary throttling
7. Electronic expansion valve throttling method can be
selected 8. Voltage, current, frequency, power, power factor, pressure, flow, etc. can be monitored, which can be displayed in real time on the PC and can be printed.
9. The m*n electrical of the *r conditioner can be connected manually, which is very hands-on, and the connection line uses a dedicated D4 connection line.
III. Technical performance
1. Input power: single-phase three-wire AC220V±10% 50Hz
2. Working environment: temperature -10℃～+40℃ Relative humidity <85% (25℃) Altitude <4000m
3. Refrigerant: R22
4. Device capacity: <1.5kVA
5. Weight: 100kg
6. Dimensions: 150cm×60cm×130cm
IV. Basic configuration and functions of the experimental device
1. Control console
It adopts industrial aluminum profile structure and matte color spray p*nting structure with novel shape. The *r circulation system is arranged on the top layer, which can intuitively display the structure of the *r handling unit; the power control and measuring instrument function board are set on the front. There are four universal wheels with brakes at the bottom for easy movement and fixation.
2. AC power supply
Single-phase three-wire 220V AC power supply, through the leakage protector, the m*n power supply is controlled by the start and stop switch
3. Measuring instruments
(1) 2 4-20MA temperature and humidity sensors . In order to read the readings intuitively, the temperature and humidity signals of each group are taken out. The temperature measurement range is: -40℃～+120℃. The
humidity measurement range is: 0%～100%
(2) 2 vacuum pressure gauges (accuracy level 2.5)
with ranges of -0.1MPa～1.5MPa, -0.1MPa～3.5MPa and 0～0.4MPa, respectively, to measure the pressure of the low-pressure side, high-pressure side and steam generator of the refrigeration system in real time
4. Control instruments
(1) 1 pressure controller
Real-time monitoring of the low-pressure side pressure, high-pressure side pressure and steam generator pressure of the refrigeration system. When the high pressure is higher than the set value or the low pressure is lower than the set value, the controller sends a control signal to cut off the power supply of the compressor
5. Air handling unit
The *r handling unit includes a coarse filter, a steam nozzle, a surface cooler, a heater and a fan.
6. Air-cooled refrigeration unit: consists of 2-horsepower fully enclosed compressors, *r-cooled condensers, drying filters, capillaries, surface coolers and liquid filling valves.
7. Humidification system: consists of a steam system consisting of a steam generator and a steam nozzle
. 8. The control system is automatically controlled by an intelligent constant temperature and humidity control system.
9. Heating system: consists of PPT.
10. Single-chip microcomputer , PLC programmable design and control virtual simulation software:
This software is developed based on unity3d, with built-in experimental steps, experimental instructions, circuit diagrams, component lists, connection lines, power on, circuit diagrams, scene reset, return and other buttons. After the connection and code are correct, the start/stop, forward motion and reverse motion buttons can be used to operate the 3D machine tool model movement. When the line is connected, the 3D machine tool model can be zoomed in/out and translated.
1. Relay control: Read the experiment guide and enter the experiment. By reading the circuit diagram, select relays, thermal relays, switches and other components in the component list and drag and drop them into the electrical cabinet. The limiter is placed on the 3D machine model. You can choose to cover the cover. Some component names can be renamed. Then click the connect line button to connect the terminals. After the machine circuit is successfully connected, choose to turn on the power and operate. If the component or line connection is wrong, an error box will pop up. The scene can be reset at any time.
2. plcControl: The experiment is the same as relay control, with the addition of PLC control function. After the connection is completed, enter the program writing interface through the PLC coding button, write two programs, forward and reverse, with a total of 12 ladder diagram symbols. After the writing is completed, select Submit to verify the program. After successful verification, turn on the power to operate. Error boxes will pop up for components, line connections, and code errors, and the scene can be reset at any time.
3. Single-chip microcomputer control: The experiment is the same as relay control, with the addition of single-chip microcomputer control function. After the connection is completed, enter the programming interface through the C coding button, enter the correct C language code, and submit after successful verification, turn on the power to operate. Error boxes will pop up for components, line connections, and code errors, and the scene can be reset at any time.
V. Experimental projects
1. Working principle of constant temperature and humidity unit tr*ning system
2. Air conditioning operating condition experiment of constant temperature and humidity unit
3. Electrical self-control
4. Working principle of refrigeration system
5. Working principle of dehumidification system
6. Working principle of heating system
7. Application relationship of refrigeration, heating, and dehumidification
8. Application of temperature and humidity sensors
9. Fault tr*ning of constant temperature and humidity unit
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