CWith the development of society and economy, all walks of life in the society have more and more demands for constant temperature and humidity laboratories. In the laboratory construction consulting information received by CEIDI Xidi, the proportion of constant temperature and humidity requirements is very high, so they are separated. Take it out to do related science popularization to help companies better carry out their work. According to the development process, as the requirements for air temperature and humidity in the industrial production environment become higher and higher, precision industrial manufacturing products such as refrigeration accessories and electrical control components are gradually designed and manufactured in accordance with European industrial standards, and can only be produced in a constant temperature and humidity environment. Reliability, high efficiency, clear control and other characteristics. Since then, the application field of constant temperature and humidity environment control has become more and more extensive. In addition to the precision manufacturing industry, it is gradually used in cotton spinning, wool spinning, chemical fiber, paper, packaging, tobacco production enterprises, quality inspection, fiber inspection and other industries. It is also widely used in animal and plant laboratories, biological microbiology laboratories and other environments.

Constant temperature and humidity, as the name implies, is to continuously control a certain temperature and humidity at a set value. Constant temperature and humidity laboratory is a laboratory that uses certain special equipment and technical methods to make its indoor temperature and humidity meet the requirements of a certain humidity control and test standard atmosphere. It is the product quality inspection and commodity quality inspection of the manufacturer. Infrastructure. When CEIDI designs and builds a constant temperature and humidity laboratory, it will determine the design plan based on environmental parameters, products, experimental objects, and experimental equipment requirements. The overall design of the constant temperature and humidity room will comprehensively consider basic buildings, hydropower, constant temperature and humidity air conditioning units, constant temperature and humidity laboratory equipment, cost and budget control, safety requirements, and future sustainable development requirements. Let's talk about the relevant knowledge of the constant temperature and humidity laboratory in detail below.

General settings for constant temperature and humidity laboratory

1. Constant temperature and humidity laboratories are divided into three categories: high temperature laboratories, normal temperature laboratories, and low temperature laboratories.

① The high temperature laboratory is 30~80℃ (low humidity is required to be controlled at <50%; high humidity is required to be controlled at >80%).

② Room temperature laboratory 18~28℃ (ordinary constant temperature and humidity laboratory, precision constant temperature and humidity laboratory, high precision constant temperature and humidity laboratory, ultra-high precision constant temperature and humidity laboratory).

③ Low temperature laboratory 10~15℃ (relative humidity is controlled at 30~50%).

Design requirements of constant temperature and humidity laboratories in different industries

① Precision manufacturing industry: commonly used conventional constant temperature and humidity laboratories, the temperature is set at 18-30℃, and the humidity is set at 45%-70%.

② Pharmaceutical research industry: commonly used low-temperature, constant-temperature and constant-humidity laboratories, the temperature is set at 12-18℃, and the humidity is set at 45%-70%.

③ Biological culture industry: commonly used ultra-low temperature constant temperature and humidity laboratory, the temperature is set at 5-12 ℃.

④ Electronic product aging test: commonly used high temperature and high humidity aging room, the temperature is set at 30-80℃, and the humidity is set at 40%-95%.

Technical points of decoration design for constant temperature and humidity laboratory

1. If it is a 2℃ constant temperature room, the air change frequency is about 10~15 times/h.2. If it is a 1 ℃ constant temperature room, the air exchange frequency is about 15-20 times/h.

3. If it is a constant temperature room of 0.5℃, the air exchange frequency is about 20 times/h.

4. If it is a constant temperature room of 0.2°C, the number of air changes is about 30 times/h.

CEIDI Xidi constant temperature and humidity laboratory decoration materials are recommended to choose building materials with good heat insulation and moisture insulation performance. It is best to choose color steel composite panels for the four facades of the laboratory (in order to meet the fire protection requirements, rock wool color steel plates are generally used. However, rock wool insulation The performance is poor, it is best to add a layer of phenolic aluminum foil insulation board outside the rock wool color steel plate to increase the insulation performance of the external wall, which can effectively save energy and reduce consumption). In order to ensure the airtightness, the top surface should be sealed with a color steel plate. The surface is then sealed with phenolic aluminum foil board for heat preservation, and the ground is treated with phenolic heat preservation board for heat preservation and moisture isolation; for see-through windows, double-layer hollow glass windows are required. To achieve the effect of constant temperature and humidity, laboratory air conditioning design is the most important part. It is the heart of temperature and humidity control, requiring high precision and low failure rate. Therefore, the air conditioner must be required to adjust the cooling capacity. There are currently two ways on the market: frequency conversion and chilled water adjustment.

Frequency conversion adjustment:

In fact, the power of the compressor is changed by changing the nature of the power supply, allowing the compressor to work under low load or overload, and at the same time adjust the throttling flow of the refrigeration system, so a lot of cumbersome links must be added, and each link must be perfectly matched , Otherwise it will malfunction. The reality is indeed the case, and the failure rate is very high.

Chilled water type unit:

Using cold water around 7℃ as the cold source, the electric valve is opened or closed to control the water flow, thus easily controlling the cooling capacity. The electric valve structure is as simple as a household faucet, so the failure rate is almost zero, and the control effect is the most stable . By reasonably calculating the heat and humidity load and air dew point of the room to match the air volume, cooling volume, heating volume, and humidification volume, the stepless regulation of each component is controlled by PLC, and the sensor with high sensitivity and good linearity can be selected to achieve temperature ± 0.5℃, humidity ±2%. This method requires calculation and matching based on the actual area and load of each laboratory, so there is no standard molding unit, all of which are customized processing types. Generally, it is realized by the combination ratio of the combined air-conditioning box, so the disadvantage is that it covers a large area, the stability of the entire system is poor, the system maintenance is complicated, and it is difficult to repair after a problem occurs. The ventilation method is from the initial bottom air, to the upper natural air supply, to the upper diffuser air supply, to the most advanced air duct + micro-perforated ceiling air supply, and the lower floor return air method, the whole laboratory air supply is soft , Uniform, temperature and humidity control is very stable. In order to protect the laboratory from external interference, fresh air must be provided to the laboratory to keep the laboratory air pressure positive, so that outside air cannot enter the laboratory and ensure that the laboratory's temperature and humidity are stable for many years.

Finally, CEIDI, which specializes in creating a good experimental environment, also warmly reminds everyone: The design of a constant temperature and humidity laboratory needs to strictly abide by the relevant regulations of the environmental protection department, and it is not arbitrarily to discharge more than the specified waste gas, waste gas culture, etc., during construction We must adhere to the requirements of careful design and safe construction, and at the same time consider the sustainable development of the laboratory in the future.