The constant temperature and humidity laboratory adopts the direct evaporation independent constant temperature and humidity air conditioning system, which has the advantages of simple system, convenient adjustment, convenient operation and management, energy saving and so on. In engineering design, the system should be reasonably selected according to the requirements of laboratory temperature and humidity accuracy, room load calculation should be carried out as detailed as possible, and matching constant temperature and humidity units should be selected.
为了满足室内恒温恒湿精度的要求，恒温恒湿空调房的换风频率较大。根据经验，±2℃恒温恒湿温室的换风频率约为10 ~ 15次/h。±1℃恒定温室，通风约15 ~ 20次/h;在±0.5℃恒温温室中，换气次数约为>20次/h;在±0.2℃的恒定温室中，空气变化约为>30次/h。
In order to meet the requirement of indoor constant temperature and humidity accuracy, constant temperature and humidity air-conditioning room has a higher frequency of air exchange. According to experience, the frequency of air exchange in (+2 C) constant temperature and humidity greenhouse is about 10-15 times/h. The ventilation rate is 15-20 times/h in (+1 C) constant greenhouse, 20 times/h in (+0.5 C) constant temperature greenhouse, and more than 30 times/h in (+0.2 C) constant greenhouse.
Air supply design is also one of the main factors affecting the accuracy of thermostat greenhouse. In the design of high precision indoor air supply with constant temperature and humidity, the following principles should be considered: reasonable air supply process, giving full play to the cooling or heating effect of air supply; establishing stable and uniform temperature field to ensure the average temperature and working area temperature when air reaches the working area The difference of degrees does not exceed the allowable fluctuation of temperature. When the airflow reaches the working area, the velocity is about 0.25m/s. The whole orifice plate and part orifice plate are used in the high precision constant temperature and humidity laboratory. The lower air supply and return air are uniform and the effect is good.
In the construction of constant temperature and humidity laboratory, its insulation sealing is also very important. The laboratory has the advantages of heat preservation, good sealing, energy saving, improving temperature and humidity accuracy and reducing operation cost.
Main factors for selecting constant temperature and humidity precision air conditioning
A. Control Accuracy: The purpose of establishing a laboratory is to establish an inspection and testing environment that meets the technical standards. Therefore, whether the control accuracy of the equipment can meet our requirements is the primary factor in choosing precision air conditioning. It is suggested that the most advanced precision air conditioning and complete analog control technology should be adopted in the high precision constant temperature and humidity laboratory to ensure high accuracy and more stable temperature and humidity.
B. Reliability: Constant temperature and humidity laboratory is the infrastructure of product quality inspection and control in production enterprises and commodity quality inspection in circulation field. During the test, the normal use of the laboratory should be ensured. Therefore, product maturity is a key factor in the selection of precision air conditioning.
C. Energy saving, environmental protection, energy saving and environmental protection are the most important aspects of sustainable development of society as a whole. Selecting new technology of constant temperature and humidity precision air conditioning can save more than 50% energy compared with traditional constant high-power heating and humidification refrigeration dehumidification compensation control method. Compared with traditional packaging units, the requirement of installing power load at the same time can be reduced. More than 50% lower, greatly reducing the cost of equipment operation.
D. Easy to operate: Most operators in constant temperature and humidity laboratories are not familiar with HVAC and equipment, so it is necessary to ensure that the operation interface of air conditioning units is friendly and easy to understand, and no special training is required. At the same time, the unit equipment needs simple daily maintenance and management, and no professional personnel; the unit equipment is small in size, so as to occupy the laboratory area as small as possible.