By what methods does the constant temperature and humidity machine achieve the control effect
Time:2021/12/20 11:10:52
Due to the requirements of technological development, constant temperature and humidity machines are widely used in laboratories, medical workshops, precision processing workshops and other places. So how does the constant temperature and humidity machine achieve the control effect? Face this problem. Next, let the editor of the constant temperature and humidity machine explain this, I hope it can be helpful to everyone, the specific content is as follows:
1. High temperature and humidity control efficiency
In the design of the constant temperature and humidity machine system, the unit is divided into two types according to temperature and humidity control, air-cooled and water-cooled, equipped with multi-stage electric heaters, electrode humidification tanks and microcomputer controllers. Under cooling and dehumidification conditions, the evaporator coil ensures that the air temperature is below the dehumidification dew point and keeps the room temperature at the set level by reheating the heater. Since the cooling capacity of this type of unit is usually only the second or third gear, the dew point temperature of the air outlet of the unit is not easy to stabilize, and the ability to control the relative humidity in the room is low. Usually suitable for laboratory use, the relative humidity control accuracy is ±5%. Simply put, it is a process of cooling, heating, and dehumidification.
2. High precision of environmental monitoring system
In environments where constant temperature and humidity machines are installed, especially in high-precision environments such as laboratories and hospitals, the requirements for temperature and humidity are very strict. At the same time, in such an environment, the distribution of heat and water sources is very difficult, resulting in uneven distribution of temperature and humidity in the environment. Therefore, the automatic control system of the constant temperature and humidity machine is very sensitive to changes in environmental temperature and humidity, and it is imperative to be able to quickly identify temperature and humidity changes in the environment and respond quickly and effectively. Provide the temperature and humidity in the environment. Modern constant temperature and humidity machines usually require a temperature accuracy of ±2°C and a humidity accuracy of ±5%. The high-precision constant temperature and humidity machine can achieve a temperature accuracy of ±0.5°C and a humidity accuracy of ±2%.
3. Development of automatic control backup program
Constant temperature and humidity machines are widely used in various high-precision environments that require temperature, humidity, cleanliness, air distribution and other characteristics. It is necessary to ensure safe and reliable operation of constant temperature and humidity machines for 24 hours and 365 days. Therefore, when designing a constant temperature and humidity machine system, emergency procedures are inseparable under various emergencies. This requires reliable components and excellent turbine room A/C control. Usually, this is an N+1 backup. If a constant temperature and humidity machine has a problem, other constant temperature and humidity machines can immediately take over the entire system.
4. Purification requirements and residual pressure outside the machine
The constant temperature and humidity machine does not have high requirements for the purification of the constant temperature and humidity machine and the residual pressure outside the machine. It mainly overcomes the return duct, valve, diffuser, primary filter, etc., to meet the requirements of ordinary units.
5. High sensible heat coefficient and large air volume
Sensible heat ratio is the ratio of sensible cooling capacity to total cooling capacity. The total cooling capacity of the constant temperature and humidity machine is the sum of the apparent cooling capacity and the latent cooling capacity. The latent cooling capacity is the cooling capacity used for dehumidification, and the sensible cooling capacity is the cooling capacity used in the environment. The operating environment of the constant temperature and humidity machine is mainly physical heat, so the physical heat of constant temperature and humidity is relatively high, generally above 0.9. If the ambient temperature changes too quickly in a short period of time, it will cause the system server to malfunction. Therefore, it is designed to use a large air volume to keep the outlet temperature too low, increase the air exchange volume, and facilitate the stability of the constant temperature and humidity machine and the system.
The above five points are all about the way the constant temperature and humidity machine achieves the control effect, thank you for your understanding and support!