1. Overview of the constant temperature and humidity laboratory program
Constant temperature and humidity laboratory is to make a certain laboratory through certain special equipment and technical methods to make the indoor temperature and humidity meet the requirements of a certain humidity control and test standard atmosphere. Constant temperature and humidity laboratory is the infrastructure for product quality inspection and control of production enterprises and commodity quality inspection in the field of circulation. Constant temperature and humidity laboratory is widely used in cotton spinning, wool spinning, chemical fiber, paper, packaging, tobacco production enterprises and quality inspection, fiber inspection and other departments, in accordance with the relevant ISO and GB standards, textiles, textile raw materials, paper, paper products and cartons, etc. The inspection of the qualitative physical items of the commodity must be carried out under standard atmospheric conditions. The standard atmosphere for inspection of textiles and textile raw materials is in accordance with ISO139 and GB6529 standards, with a temperature of 20±2 ℃ and a relative humidity of 65%±2%; the standard atmosphere for inspection of paper, paper products and cartons is in accordance with ISO187 and GB10739 standards, with a temperature of 23 ±1℃, relative humidity 50%±2%. In addition to the constant temperature and humidity laboratory with regular temperature and humidity, there are other special requirements such as low temperature 5-18℃, high temperature 30-80℃, relative humidity less than 40%RH, low humidity, and relative humidity higher than 80%RH. Constant temperature and humidity laboratory.
Constant temperature and humidity laboratory we can provide: conventional constant temperature and humidity laboratory
Testing temperature and humidity standards for textile industry:
2, the design points of the scheme
The overall planning of the laboratory should take into account the following requirements: the scope is extremely wide, and various professionals such as construction, water and electricity, air-conditioning, laboratory users, etc. must participate in the planning.
Design purpose: to create a workplace for laboratory equipment that can not only ensure its stable and reliable operation, extend its service life, but also meet user requirements and staff physical and mental health.
Overall design: fully consider the relationship between various majors, carry out strict coordination, do a good job, do not leak, do not touch.
Specific design: Adopt advanced technology at home and abroad, select environmentally friendly equipment and materials that are both advanced, cost-effective and reasonable, and incorporate humanized design concepts.
The main points of the overall design and planning of the constant temperature and humidity laboratory
3. Operating characteristics of constant temperature and humidity laboratory
The constant temperature and humidity laboratory adopts a direct evaporative independent constant temperature and humidity air conditioning system, which has the advantages of simple system, easy adjustment, convenient operation and management, and energy saving. In the engineering design, the system should be selected reasonably according to the temperature and humidity accuracy requirements of the laboratory, and the load calculation of the room should be as detailed as possible and the matching constant temperature and humidity unit should be selected.
In order to meet the requirements of indoor constant temperature and humidity accuracy, the constant temperature and humidity air-conditioning room has a large number of air changes. According to experience, the constant temperature room of ± 2 ℃, the number of air changes is about 10-15 times/h; the constant temperature room of ± 1 ℃, change The air frequency is about 15-20 times/h; the air change frequency is about >20 times/h in the constant temperature room of ±0.5℃; the air change frequency is about >30 times/h in the constant temperature room of ±0.2℃;
Airflow organization design is also one of the main factors that affect the accuracy of the constant temperature room. When designing the airflow organization in a high-precision constant temperature and humidity room, the following principles should be considered: reasonable airflow organization process, give full play to the cooling or heating effect of the airflow; establish a stable Uniform temperature field to ensure that when the airflow reaches the working area, the difference between its average temperature and the temperature of the working area does not exceed the allowable temperature fluctuation value; when the airflow reaches the working area, its flow velocity is about 0.25m/s. ±2℃ and ±1℃ high-precision constant temperature and humidity laboratory, using full orifice plate and partial orifice plate for air supply, and even return air from the lower part, the effect is better.
In the construction of a constant temperature and humidity laboratory, its heat preservation and airtightness is also very critical; a laboratory with good heat preservation and airtightness has the advantages of saving energy, improving temperature and humidity accuracy, and reducing operating costs.
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