The design of constant temperature and humidity laboratories also has certain grade classification standards. Now many companies pursue high precision when designing laboratories. How to achieve high-precision constant temperature and humidity laboratory design requires certain data standards and indicators. To achieve a high-precision constant temperature and humidity laboratory, four aspects must be paid attention to. The temperature fluctuation range in a large space is controlled to ±0.5℃; the relative humidity fluctuation range is controlled to ±2%, meeting the requirements of high-precision constant temperature and humidity environment. Main application areas: inspection and verification laboratories such as metrology, optics, optoelectronics, paper, textile fibers, biosafety, and precision machining.
To achieve high precision, four aspects must be paid attention to:
1. The decoration must strictly achieve the effect of heat preservation and moisture insulation;
2. High-precision constant temperature and humidity air conditioning is the key;
    high-precision constant temperature and humidity air conditioning must be able to adjust the cooling capacity according to the temperature difference. Now there are two ways to adjust the cooling capacity of real high-precision constant temperature and humidity air conditioning: chilled water type and variable frequency type. Use cold water of about 7℃ of ordinary central air conditioner, install a valve as simple as a faucet for control, when cooling is not needed, close the valve, when cooling is required, open the valve, and the valve opening is like a faucet, which can be large or small, truly realize 0% to 100% adjustment of water flow, easily realize cooling capacity adjustment, control temperature and humidity very stably, and the failure rate is almost 0.
    The working principle is to change the power supply frequency to change the power of the compressor, thereby changing the cooling capacity, and the effect is very good. However, in order to achieve the frequency conversion effect, it is necessary to add precision accessories such as inverters and electronic expansion valves, which are expensive and must be closely coordinated between the accessories. Otherwise, a small link failure may cause the compressor to be damaged. This is also the case in practice, and the frequency of compressor damage is very high (the compressor is replaced about every 2 to 3 years).
3. Air supply method:
The air supply method has gone through several stages:
lower air supply and upper return air, which is mostly used in machine rooms with low precision requirements and sensible heat concentrated in the lower part;
upper hood air supply and lower side return air, which is mostly used in small-area machine rooms with low temperature and humidity requirements;
upper duct diffuser air supply and lower side return air, which has also been used in laboratories, but the actual maximum humidity accuracy can reach ±3%;
upper diffuser + microporous air supply, lower raised floor return air: uniform air supply and return air, which is the only effective air supply method for high-precision constant temperature and humidity laboratories.
4. Wind not only guarantees the laboratory staff's demand for fresh air, but also contributes to and is indispensable to ensuring the stability of temperature and humidity, because the temperature and humidity outside the laboratory vary greatly with the seasons. In order to ensure that the laboratory is not affected by the outside world, the only effective way is to add fresh air to the laboratory and 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.
    The above are the four major precautions for the design and decoration of high-precision constant temperature and humidity laboratories. For laboratories, it is very important not to be affected by the outside world.