Evaporator works
The evaporator is a very important component in the refrigeration of the high-low temperature alternating damp heat test box. The low-temperature condensation "liquid" passes through the evaporator and exchanges heat with the outside air, and the "gas" heat absorption reaches the cooling. effect. When the high-low temperature alternating damp heat test box is cooled, most of the refrigerant that flows into the evaporator of the test box through the expansion valve is liquid, but the moisture content also has a part of the gas. The refrigerant absorbs heat in the evaporator and the liquid continuously evaporates into gas, so the refrigerant vaporizes more and more as it flows through the coil. As long as the liquid cooling does not evaporate, the temperature of the refrigerant in the evaporator will not increase. However, when the last drop of liquid turns into steam, the reabsorbed heat raises the temperature of the gas, so if the temperature starts to rise at the outlet end of the coil, it means that there is no liquid in the evaporator. Accurate control of the flow of refrigerant through the evaporator is important.
For the dry evaporator, excessive amount of paper coolant should be avoided, otherwise part of the liquid will flow through the evaporator and just pass through the coil outlet, and it will be sucked by the compressor and damage the compressor. In addition, the lack of refrigerant should also be avoided, otherwise the refrigerant will completely evaporate when leaving the outlet end of the coil, and the efficiency of the evaporator will not be high. To ensure the efficiency of the evaporator, it should be ensured that sufficient refrigerant evaporates the entire evaporator and there is no liquid refrigerant at the outlet of the coil.
Character: High and Low Temperature Alternating Humidity Tester Controller:
1. High and Low Temperature Alternating Humidity Chamber Controller adopts all-imported LCD digital display button display, English interface (Korea TEMI300) or LCD touch display, Chinese and English switching interface (Korea TEMI880), or imported Japanese "OYO" digital display Touch the temperature and humidity controller. Temperature and humidity control can be directly displayed, eliminating the original temperature and humidity control defects. 2. Controller programmable, memory capacity 120 groups, each program maximum 999 segments.
3. After the data and test conditions are input, the controller has a lock function to avoid human touch and change the temperature. 4. The controller has the function of PID auto-calculation, which can immediately correct temperature and humidity changes, so that the temperature and humidity control is more accurate and stable.
5. Optional printer. Can print record setting parameters and scan out the temperature and humidity curve. 4~200mA standard signal. 6. Electrical control The main parts use imported "Schneider" and "Merlin Gerin" components to better control temperature and humidity. 7. With RS-232 communication interface, can be designed on the computer program, monitor the test process and perform automatic switch and other functions.
High and Low Temperature Alternating Humidity Test Chamber Operation Control System:
(a) Refrigeration system:
1. High and low temperature alternating humidity test chamber refrigerator adopts closed French Taikang (or semi-enclosed German Copeland) compressor. 2. The refrigeration system uses a unit or binary cold circuit system design. Air-cooled single compressor/air-cooled cascade compression refrigeration system (2) Air circulation system:
1. Adopt multi-blade centrifugal blower for strong air circulation to avoid any dead angle and make the temperature and humidity distribution in the test area even.
2. The air circulation and return air return design, wind pressure, wind speed are in line with the test standards, and can make instant temperature and humidity stability of the door open time fast.
3. The air deflector can be adjusted up, down, left and right to ensure uniform distribution of temperature and humidity.
(III) Humidification and dehumidification system:
1. Humidification: Externally isolated stainless steel superficial surface evaporative humidifier, through the formation of wet steam humidification, through the probe humidity.
2. Dehumidification: Dehumidifying method using evaporator coil dew point temperature laminar contact.
3. Water Supply: Hidden water tank water supply, small water pump automatically pumped to the humidification barrel, can recycle water, save water and reduce consumption. (d) Heating system:
1. Fin heat pipe type nickel-chromium alloy stainless steel electric heater. Refrigeration, circulation, humidification, dehumidification, and heating systems are completely independent to improve efficiency, reduce test costs, increase life, and reduce failure rates.
Dongguan Qingsheng Testing Equipment Co., Ltd., in line with the service tenet of “customer first, quality firstâ€, makes full use of the technology of environmental testing engineering and reliability engineering for many years to provide customers with high-quality, accurate, durable, beautiful detection equipment, ensuring 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 Testing Equipment Co., Ltd., which is a company specializing in the design, development, installation and construction of ISO high-precision constant temperature and humidity laboratory. It also runs laboratory equipment and laboratory furniture products. After several years of unremitting efforts, our company has possessed the comprehensive strengths of investment program demonstration, engineering drawing design, equipment selection and supply, project implementation management, and continuation of services, and developed a new generation of ISO constant temperature and humidity laboratory computer automatic The control system also has its own science and technology center to provide customers with a highly professional full-process service.