Constant temperature and humidity room is a kind of simulated environmental experimental equipment, which can also be called constant temperature and humidity laboratory. Because it is related to the research and development, production and quality of products, the accuracy requirements must be strict. Therefore, many companies now pursue high precision to prove the technical level of their own manufacturers when designing laboratories, such as achieving a temperature fluctuation range of ±0.5℃ in a large space; a relative humidity fluctuation range of ±2%, to meet the requirements of high-precision constant temperature and humidity environment. The main application areas of high-precision constant temperature and humidity room: measurement, optics, optoelectronics, paper, textile fiber, biosafety, precision machining and other testing laboratories. So how to build a high-precision constant temperature and humidity room? What aspects should be started?
First, the decoration must strictly ensure the insulation and moisture insulation effect, and attach great importance to the design, material selection and construction of the constant temperature and humidity room, and each link cannot be ignored.
Second, the high-precision constant temperature and humidity host is the key;
the host of the high-precision constant temperature and humidity room must be selected to adjust the cooling capacity according to the temperature difference, high-precision constant temperature and humidity air conditioner, chilled water type and variable frequency type two adjustment methods. Use cold water of about 7℃ from ordinary central air conditioners, install a valve as simple as a faucet for control, and close the valve when refrigeration is not needed. The cooling capacity can be easily adjusted, and the temperature and humidity can be stably controlled. High-quality simulated environmental test equipment is relatively expensive. Customers should consider whether they are prepared for long-term use before choosing, and pay more attention to quality, not just the price.
3. Fresh air system
Fresh air not only guarantees the demand for fresh air for the staff in the constant temperature and humidity room, but also contributes to and is indispensable for ensuring the stability of temperature and humidity, because the temperature and humidity outside the constant temperature and humidity room vary greatly with the seasons. In order to ensure that the interior of the laboratory is not affected by the outside world, the only effective way is to add fresh air to the constant temperature and humidity room to ensure that the laboratory air pressure is positive, so that the unqualified air that changes at any time from the outside world cannot be mixed into the laboratory, ensuring the long-term stability of the laboratory.
4. Air supply method: The equipment generally has the following air supply methods during operation:
1. Upper air supply and upper return air, mostly used in machine rooms with low precision requirements and sensible heat concentrated in the lower part;
2. Upper hood air supply and lower side return air, mostly used in small-area machine rooms with low temperature and humidity requirements; upper duct diffuser air supply and lower side return air, also used in laboratories, but the actual maximum humidity accuracy can reach ±3%.
3. Upper diffuser + microporous air supply, lower raised floor return air: uniform supply and return air, is the only effective air supply method for high-precision constant temperature and humidity laboratories.
    The above are the four main points for building a high-precision constant temperature and humidity room. Therefore, when building a constant temperature and humidity room, it is very important not to be affected by the outside world. The external environment is also a factor to be considered. It should be constructed according to local conditions and actual conditions.