The role of the evaporator
How the evaporator works
The evaporator is a very important component in the cooling of the high and low temperature alternating heat and humidity test chamber. The low temperature condensing "liquid" body passes through the evaporator to exchange heat with the outside air, and the "gas" heats up to reach the refrigeration. effect. When the high-low temperature alternating heat and humidity test chamber is cooled, most of the refrigerant flowing into the test chamber evaporator after passing through the expansion valve is liquid, but also contains a part of gas in the water content. The refrigerant absorbs heat in the evaporator, and the liquid evaporates continuously into a gas, so that as the refrigerant flows through the coil, more and more gas evaporates. As long as the liquid cooling does not evaporate, the temperature of the refrigerant in the evaporator does not rise. However, when the last drop of liquid becomes steam, the re-absorbed heat increases the temperature of the gas, so if the temperature begins to rise at the outlet end of the coil, it indicates that there is no liquid in the evaporator. It is important to accurately control the flow of refrigerant through the evaporator.
For dry evaporators, excessive paper refrigerant should be avoided, otherwise a part of the liquid will flow through the entire evaporator and just through the coil outlet, which will be sucked in by the compressor and damage the compressor. In addition, the refrigerant should be avoided, otherwise the refrigerant will completely evaporate when leaving the outlet end of the coil, and the efficiency of the evaporator is not high. To ensure the efficiency of the evaporator, it should be ensured that sufficient refrigerant will evaporate the entire evaporator and that there is no liquid refrigerant at the outlet of the coil.
Symbol: high and low temperature alternating heat and humidity test chamber controller:
1. High and low temperature alternating heat and humidity test box controller adopts full imported LCD digital display button display, English interface (South Korea TEMI300) or LCD touch display, Chinese and English switching interface (South Korea TEMI880), or imported Japanese "OYO" digital display Touch the button temperature and humidity controller. The temperature and humidity control can be directly displayed, and the defects of the original temperature and humidity are discarded. 2. The controller is programmable, the memory capacity is 120 groups, and each program has a maximum of 999 segments.
3. After the data and test conditions are entered, the controller has a locking function to avoid changing the temperature value due to human touch. 4. The controller has the function of PID automatic calculation, which can correct the temperature and humidity change conditions immediately, making the temperature and humidity control more precise and stable.
5. Optional printer. It can print the record setting parameters and scan out the temperature and humidity curve. 4~200mA standard signal. 6. The main parts of the electrical control adopt imported “Schneider†and “Meilan Rilan†components to better control the temperature and humidity. 7. With RS-232 communication interface, you can design programs on the computer, monitor the test process and perform functions such as automatic power on/off.
High and low temperature alternating heat and humidity test chamber operation control system:
(1) Refrigeration system:
1. High and low temperature alternating heat and humidity test chamber refrigerator adopts fully enclosed French Taikang (or semi-closed German Copeland) compressor. 2. The refrigeration system is designed with a unit or binary low temperature loop system. Air-cooled single-machine compression/air-cooled cascade compression refrigeration (2) Air circulation system:
1. Adopt multi-wing centrifugal blower to deliver strong air circulation, avoid any dead angle, and make the temperature and humidity distribution in the test area even.
2. The wind path is designed to return to the wind and return to the wind. The wind pressure and wind speed are in compliance with the test standards, and the temperature and humidity can be stabilized at the instant of opening the door.
3. The wind deflector can be adjusted up, down, left and right to ensure uniform temperature and humidity distribution.
(3) Humidification and dehumidification system:
1. Humidification: An externally isolated all-stainless steel shallow surface evaporating humidifier is formed by heating to form a wet steam humidification and detecting the humidity through a probe.
2. Dehumidification: The dew point of the dew point temperature of the evaporator coil is used to contact the dehumidification method.
3. Water supply: Concealed water tank water supply, small water pump automatically pump water to the humidification barrel, which can recover the remaining water. Save water and reduce consumption. (4) Heating system:
1. Fin heat-dissipating tubular nickel-chromium alloy stainless steel electric heater. Refrigeration, circulation, humidification, dehumidification, and heating systems are completely independent to increase efficiency, reduce test costs, increase life, and reduce failure rates.
Dongguan Qingsheng Testing Equipment Co., Ltd. adheres to the service tenet of "customer first, quality first", making full use of the technology of environmental testing engineering and reliability engineering for many years, providing customers with high quality, accurate, durable and beautiful testing equipment to ensure Product performance is stable and the life of the equipment exceeds customer expectations. To help customers improve quality, reduce costs and increase market competitiveness.
Our company is Dongguan Qingsheng Test Equipment Co., Ltd. It is a company specializing in the design, development, installation and construction of ISO high-precision constant temperature and humidity laboratory. It also operates laboratory equipment and laboratory furniture products. After years of unremitting efforts, our company has acquired the comprehensive strength of investment plan demonstration, engineering drawing design, equipment selection, project implementation management and continuation service, and developed a computer automatic of the new generation ISO constant temperature and humidity laboratory. The control system also has its own technology center to provide customers with highly professional full-process services.
How the evaporator works
The evaporator is a very important component in the cooling of the high and low temperature alternating heat and humidity test chamber. The low temperature condensing "liquid" body passes through the evaporator to exchange heat with the outside air, and the "gas" heats up to reach the refrigeration. effect. When the high-low temperature alternating heat and humidity test chamber is cooled, most of the refrigerant flowing into the test chamber evaporator after passing through the expansion valve is liquid, but also contains a part of gas in the water content. The refrigerant absorbs heat in the evaporator, and the liquid evaporates continuously into a gas, so that as the refrigerant flows through the coil, more and more gas evaporates. As long as the liquid cooling does not evaporate, the temperature of the refrigerant in the evaporator does not rise. However, when the last drop of liquid becomes steam, the re-absorbed heat increases the temperature of the gas, so if the temperature begins to rise at the outlet end of the coil, it indicates that there is no liquid in the evaporator. It is important to accurately control the flow of refrigerant through the evaporator.
For dry evaporators, excessive paper refrigerant should be avoided, otherwise a part of the liquid will flow through the entire evaporator and just through the coil outlet, which will be sucked in by the compressor and damage the compressor. In addition, the refrigerant should be avoided, otherwise the refrigerant will completely evaporate when leaving the outlet end of the coil, and the efficiency of the evaporator is not high. To ensure the efficiency of the evaporator, it should be ensured that sufficient refrigerant will evaporate the entire evaporator and that there is no liquid refrigerant at the outlet of the coil.
Symbol: high and low temperature alternating heat and humidity test chamber controller:
1. High and low temperature alternating heat and humidity test box controller adopts full imported LCD digital display button display, English interface (South Korea TEMI300) or LCD touch display, Chinese and English switching interface (South Korea TEMI880), or imported Japanese "OYO" digital display Touch the button temperature and humidity controller. The temperature and humidity control can be directly displayed, and the defects of the original temperature and humidity are discarded. 2. The controller is programmable, the memory capacity is 120 groups, and each program has a maximum of 999 segments.
3. After the data and test conditions are entered, the controller has a locking function to avoid changing the temperature value due to human touch. 4. The controller has the function of PID automatic calculation, which can correct the temperature and humidity change conditions immediately, making the temperature and humidity control more precise and stable.
5. Optional printer. It can print the record setting parameters and scan out the temperature and humidity curve. 4~200mA standard signal. 6. The main parts of the electrical control adopt imported “Schneider†and “Meilan Rilan†components to better control the temperature and humidity. 7. With RS-232 communication interface, you can design programs on the computer, monitor the test process and perform functions such as automatic power on/off.
High and low temperature alternating heat and humidity test chamber operation control system:
(1) Refrigeration system:
1. High and low temperature alternating heat and humidity test chamber refrigerator adopts fully enclosed French Taikang (or semi-closed German Copeland) compressor. 2. The refrigeration system is designed with a unit or binary low temperature loop system. Air-cooled single-machine compression/air-cooled cascade compression refrigeration (2) Air circulation system:
1. Adopt multi-wing centrifugal blower to deliver strong air circulation, avoid any dead angle, and make the temperature and humidity distribution in the test area even.
2. The wind path is designed to return to the wind and return to the wind. The wind pressure and wind speed are in compliance with the test standards, and the temperature and humidity can be stabilized at the instant of opening the door.
3. The wind deflector can be adjusted up, down, left and right to ensure uniform temperature and humidity distribution.
(3) Humidification and dehumidification system:
1. Humidification: An externally isolated all-stainless steel shallow surface evaporating humidifier is formed by heating to form a wet steam humidification and detecting the humidity through a probe.
2. Dehumidification: The dew point of the dew point temperature of the evaporator coil is used to contact the dehumidification method.
3. Water supply: Concealed water tank water supply, small water pump automatically pump water to the humidification barrel, which can recover the remaining water. Save water and reduce consumption. (4) Heating system:
1. Fin heat-dissipating tubular nickel-chromium alloy stainless steel electric heater. Refrigeration, circulation, humidification, dehumidification, and heating systems are completely independent to increase efficiency, reduce test costs, increase life, and reduce failure rates.
Dongguan Qingsheng Testing Equipment Co., Ltd. adheres to the service tenet of "customer first, quality first", making full use of the technology of environmental testing engineering and reliability engineering for many years, providing customers with high quality, accurate, durable and beautiful testing equipment to ensure Product performance is stable and the life of the equipment exceeds customer expectations. To help customers improve quality, reduce costs and increase market competitiveness.
Our company is Dongguan Qingsheng Test Equipment Co., Ltd. It is a company specializing in the design, development, installation and construction of ISO high-precision constant temperature and humidity laboratory. It also operates laboratory equipment and laboratory furniture products. After years of unremitting efforts, our company has acquired the comprehensive strength of investment plan demonstration, engineering drawing design, equipment selection, project implementation management and continuation service, and developed a computer automatic of the new generation ISO constant temperature and humidity laboratory. The control system also has its own technology center to provide customers with highly professional full-process services.
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