The so-called constant temperature and humidity laboratory is to use intelligent control mode, the implementation of refrigeration, dehumidification, heating, humidification, and other functions, so as to achieve precise control of indoor temperature and humidity environment. Mainly applied to textile test system, paper test, measurement calibration, coating inspection, packaging, precision processing and three coordinates testing, scientific research institutions, etc. Anhui and purification is introduced below constant temperature and humidity laboratory construction requirements and composition.
A, constant temperature and humidity laboratory
Strict 1, lab decoration: the thermal insulation of wet performance, four Suggestions laboratory facade adopts caigang composite panels, in order to meet the requirements of fire prevention, general is made of rock wool color steel plate. But the rock wool insulation performance is poor, it is best to seal it again on the outside of rock wool color steel plate layer phenolic aluminum foil insulation board, exterior wall thermal insulation performance, increase the effective energy conservation and consumption reduction), in order to ensure closure, should use choi steel sealing, top face on the top surface of phenolic resin to seal the aluminum foil plate heat preservation, the ground is wet separation treatment with phenolic insulation board insulation; For the perspective window, require the use of double layer hollow glass window.
2, laboratory air conditioning: laboratory air conditioning is the heart of the temperature and humidity control, high accuracy, low failure rate. So must demand can adjust air conditioning refrigerating capacity, at present there are two ways: one is frequency conversion adjustment, the other is a chilled water regulating mode.
Inverter control: actually is by changing the nature of the power and change the power of the compressor make the compressor to implement low work load or overload, and adjust the flow section of refrigeration system, so you have to add a lot of tedious link, and each link must be perfect match, otherwise fail. Reality is true, the failure rate is very high.
Type chilled water unit: made of about 7 ℃ cold water as the cold source, through the electric valve to open or GuanXiaoLai control water flow, so as to easily control the refrigerating capacity, and electric like home faucet valve structure simple, so the failure rate is almost zero, the control effect is the most stable. To reasonably calculate the thermal and moisture load in room and air dew point to match good airflow, cold, heat, and moisture content, through the PLC control stepless regulation of the parts, in choose high sensitivity linear sensor, can be plus or minus 0.5 ℃ temperature, humidity, plus or minus 2%. This way need by each laboratory actual area and load matching calculation, so there is no standard forming unit, for customized processing. With combined air conditioning box combination ratio, so the disadvantage is that covers an area of large, the system stability is poor, complex system maintenance, repair difficulty after problems.
3, the ventilation way
Ventilation way through several historical order, from the bottom out of the wind, to the natural air supply, on the inverter supply, until now the most advanced on the supply air duct + microporous smallpox, under floor air return way, the entire lab, downy, even air temperature and humidity control is very stable.
4, fresh air system
Fresh air system of the first function is to provide staff with fresh air, to err on the side of qualitative laboratory temperature and humidity have also played a part, is also the indispensable equipment: in order to make the lab without outside interference, must provide fresh air to the laboratory, in order to keep the laboratory air pressure is positive, that won't outside air into the laboratory, to ensure that the laboratory will secure for temperature and humidity.
Second, the constant temperature and humidity laboratory construction requirements
Constant temperature and humidity laboratory, including constant temperature and humidity between experimental area, the buffer room, air conditioning. Each area should be in the same laboratory construction plane.
1, the constant temperature and humidity chamber technical requirements
A) in accordance with ISO, GB standards.
B) the constant temperature and humidity laboratory: temperature value plus or minus 0.1 ℃ ~ + / - 1 ℃, relative humidity for the value plus or minus (1 ~ 2) %, wind speed 0.25 m/s.
2, laboratory for housing construction requirements
A) without magnetic field around the building, vibration, heat, odor and pollution, etc.
B) building height should be 2.8 m above (under beam overhead clearance).
C) the number of requirements to minimize the doors and Windows doors and Windows and insulation measures
Meet the basic requirements of the function of the laboratory:
A) the way generally adopted as a hole plate, on air supply and return air.
B) indoor headroom height is 2.5 ~ 2.85 m.
C) there is no window, reduce the number of the door.
D) the new lab room temperature without fluctuation, heating pipeline facilities. Rebuilding laboratory room temperature fluctuation, heating pipelines facilities insulation moistureproof processing should be done according to the specification.
C) in the laboratory of fire can not use spray system, such as the need to install gas fire extinguishing system is a suggested alternative.
Air conditioning equipment room construction requirements:
A) should be built in the position of the outer wall.
B) independent power supply system and grounding system.
C) has a fluctuation, the water in the peculiar smell.
The requirements of the insulation wall:
= 0.021 ~ 0.12 Kcal / ㎡, h. ℃ (= 0.0244 ~ 0.1395 w / ㎡ k.) range, bibulous rate is not greater than 10%, the thermal insulation performance, good water resistance, flame retardant, flame retardant and good dimension stability of green environmental protection material.
