High-precision constant temperature and humidity laboratories emphasize high precision. What aspects should be paid special attention to when building high-precision constant temperature and humidity laboratories?
1. High-precision temperature control
Air conditioning technology, heat transfer technology and air conditioning cooling technology are used to heat or cool the indoor temperature.
2. High-precision humidity control
Indoor humidity is humidified or dehumidified through air conditioning technology, rotary dehumidification technology and air hydration technology.
3. High-precision constant temperature and humidity control
3.1 Use building materials with good moisturizing effect to construct a stable space (reservoir) for the constant temperature and humidity system.
3.2 Use the enthalpy difference relationship between temperature and humidity and the temperature and humidity compensation method to calculate the temperature and humidity ratio.
3.3 Indoor air flow, airflow relationship, supply amount, positive pressure, negative pressure and other methods are used to adjust the indoor temperature and humidity for moderate and accurate adjustment.
3.4 Use high-precision sensors, high-precision temperature and humidity compensation systems and operating software for precision adjustment.
4. High-precision airflow organization design
The design of airflow organization is also one of the main factors affecting the accuracy of constant temperature and humidity laboratories. In the design of high-precision constant temperature and humidity chambers, air flow distribution should follow reasonable air flow distribution, give full play to the cooling or heating effect of the air supply air flow, and establish a stable and uniform temperature field to ensure that the difference between the average temperature and the temperature of the work area when the air flow reaches the work area does not exceed the allowable temperature fluctuation value. When the air flow reaches the work area, the flow rate is about 0.25m/s±1℃ and ±2℃. The high-precision constant temperature and humidity laboratory uses full-hole plates and local orifice plates for air supply, and the lower part is uniform return air, which has a better effect. In the construction of constant temperature and humidity laboratories, its thermal insulation and sealing are also very important. It has good thermal insulation and sealing, and has the advantages of energy saving, improving temperature and humidity accuracy, and reducing operating costs.
In short, the construction of high-precision constant temperature and humidity laboratories and ordinary constant temperature and humidity laboratories need to pay attention to the same aspects, but in all aspects, precision should be emphasized. More rigorous work, better materials and equipment, and high-precision test tools are required during the construction process. The essence is the key.