Planning Guidelines and Ideas for Environmental Monitoring Laboratories
I. Planning Guidelines for Environmental Monitoring Laboratories
Environmental monitoring laboratories will use a large number of toxic and harmful reagents, which will have a negative impact on laboratory personnel, instruments and even the surrounding environment. And when the laboratory is put into operation, it will consume a lot of resources and energy, so the operating cost of the laboratory should be considered. The construction of environmental monitoring laboratories should follow the criteria of "three protection, two saving and one assurance". The protection of personnel, instruments and equipment and the surrounding environment should be achieved. The two savings are to save energy in the process of construction and operation. One guarantee is to ensure that the test results are accurate and reliable.
Planning of Environmental Monitoring Laboratory
II. Planning Concept of Environmental Monitoring Laboratory
In order to ensure the realization of the above criteria, safety, comfort, energy saving and reliability are generally considered.
According to international standards, chemical laboratories require the use of fresh air system to ensure that the chemical gases generated during the test are not recycled. Laboratories with the possibility of chemical pollution need to provide more than four times of fresh air ventilation to ensure the continuous updating of laboratory air flow, prevent the addition of toxic gas concentration, and ensure the safety of test personnel. Laboratories or rooms with the possibility of chemical contamination should always be kept under negative pressure (except clean rooms) to ensure the safety of the surrounding critical areas.
In general, the air conditioning mode of laboratory should be fan coil unit plus fresh air air conditioner. The fresh air which has been adjusted by temperature can be sent directly to the room to keep the room temperature suitable. Each laboratory should have a fan coil unit, which can maintain the comfort of the room when the fresh air volume is insufficient to maintain the temperature, or when the air supply and exhaust system does not start.
(3) Energy saving
In order to prevent unnecessary energy consumption, some duty rooms and computer rooms in the laboratory should be supplied by small separate air conditioning mainframe, which is not integrated with the large system. According to the condition of the ventilation equipment in the laboratory and the operation of the room, the whole ventilation system can provide the lowest safe and stable air supply/exhaust volume and reduce the unnecessary air supply/exhaust volume. The air supply and exhaust system in the laboratory should be operated in different zones. The air supply and exhaust system in each laboratory zone can be opened and closed according to the actual application requirements, so as to prevent the whole floor from being used in a small number of laboratories. However, it is necessary to open the possibility of the whole floor air supply and exhaust system, and then reach the energy-saving requirements.
Variable air flow control (VAV) is the best method for air flow control in environmental monitoring laboratory. Therefore, pressure-independent air flow control valves should be selected for ventilation and exhaust system equipment of laboratory building, and then fast and stable characteristics can be ensured to achieve high reliability of flow control. In the process of operation of ventilation system, the change of pressure condition of air duct will also ensure safe and stable air flow by selecting pressure-independent air supply and exhaust valves, and the protection of equipment is less. All laboratories need room controllers, which can be combined with EMS of the building through high-level interface. Besides on-site monitoring, it can also have the expansion of remote monitoring in the future. Frequency conversion planning makes it unnecessary for supply and exhaust fan to be in high load condition for a long time, with low noise and long service life.
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