Main energy saving measures of clean air conditioning system:
1. The design should have the concept of energy conservation.
In order to reduce the energy consumption of clean room, the planning and design of clean room is very important.
(1) try to choose the site with small air pollution and less dust production to build the plant; when the plant is arranged, the clean room should be arranged in the place with less pollution, pay attention to the arrangement of orientation, strengthen the setting of green belt, etc.
(2) the layout of the clean room shall minimize the area of the clean room or the area of the clean room with strict cleanliness requirements; the processes and equipment that can not be set in the clean room shall be set in the non clean area; the air cleanliness level of all kinds of rooms shall be properly determined, and the cleanliness requirements shall not be raised at will; the flow of people, logistics and auxiliary rooms shall be well organized; the clean room shall be selected in cooperation with relevant disciplines Room form, space layout, etc.
(3) reasonably determine the structure and material selection of wall and ceiling, pay special attention to the determination of enclosure structure and the selection of building materials, the structure and material selection of doors and windows; pay attention to the characteristics of clean room in the selection of facade and the number of doors and windows, avoid large windows and multiple windows to reduce the loss of cooling capacity.
(4) control the fresh air volume and exhaust air volume of the system. In the operation of the purification air conditioning system, the amount of fresh air largely determines the energy consumption of the system. In the design, the comfort factor of people is generally considered and the upper limit of the reference value is taken, but the operators are not many in the production, and the energy consumption caused by this is often ignored. All exhaust air volume in the system is generally supplemented by fresh air. The exhaust air volume shall be adjusted according to the indoor working conditions. The exhaust air volume can be controlled within an appropriate range, which can not only meet the requirements of process conditions for exhaust air, but also reduce the fresh air volume consumed by the system, and reduce the cooling and heat consumption of the purification air conditioning system for fresh air treatment. Centralized treatment shall be adopted for fresh air as much as possible, which is also conducive to the application of groundwater precooling, dust removal and humidification.
(5) reduce the resistance of the system as much as possible in the pipeline design. In the pipeline design, the resistance of the system can be reduced, and the power consumption of the air supply can also be reduced. Try to avoid long-distance air supply, shorten the length of air duct and reduce the resistance of air duct components such as elbows and tees. On the premise of meeting the requirements of wind speed, the resistance of filter can be reduced by using low wind speed to supply air and selecting appropriate wind speed.
(6) adopt secondary return air treatment. In order to reduce the power consumption, the return air shall be used as much as possible through sub filtration under the condition of avoiding cross pollution. The secondary return air can not only meet the requirements of temperature, humidity and cleanliness, but also greatly save the energy consumption of the air conditioning unit. The operation cost of the air conditioning unit can be saved about 2 / 3. Compared with primary air return system, secondary air return system can not only save equipment investment, but also reduce operation cost.
(7) adjust temperature and humidity according to different seasons. On the premise of meeting the production process, from the perspective of energy saving, it is necessary to determine the appropriate cleanliness level, temperature, relative humidity and other parameters.
(8) reduce the number of air changes in the clean room. On the premise of ensuring the clean effect, reducing the number of air changes and air supply is one of the important means of energy saving. The number of air changes is closely related to the production process, the advanced level and layout of equipment, the size and shape of the clean room, and the density of personnel.
(9) reduce the lighting intensity properly. The premise of clean room lighting is to meet the physiological and psychological requirements of workers. For high illuminance operation points, local lighting can be used, rather than improving the low illuminance standard of the whole workshop.
(10) comprehensive utilization of clean air flow. The heat recovery of process and air conditioning system is an energy-saving measure that can benefit directly. For the clean room of the pharmaceutical factory without the influence of dust particles, the clean air flow is connected in series, and the clean room is connected in series according to the cleanliness. The initial air supply is sent to the low-level room separately and then returned to the air conditioning unit, which can save several filters. For rooms that mainly eliminate waste heat and have low purification requirements, the clean air flow can be cross used and the flow direction of down supply and up return can be adopted. Down supply can reduce the air supply speed, improve the air supply temperature and reduce the temperature difference, while the up return can increase the return air temperature.
(11) consider heat recovery. In the design, the heat recovery device shall be selected. For the system with large exhaust air volume, the energy of exhaust air can be recovered to the fresh air through the rotary heat exchanger or tubular heat exchanger and the principle of heat exchange, so that the fresh air can be pretreated. It is estimated that this can save more than 25% of the operation cost, which has considerable economic significance.

(12) realize automatic control of air conditioning system and frequency conversion regulation of motor. Generally, the environment of clean room purification system can be divided into two periods: operation time and maintenance time. The requirement of cleaning time for air conditioning system is relatively simple. The design of automatic control and fan frequency control can meet the different requirements of these two time periods. Although some investment is added in the initial investment, after the actual operation, the saved operation cost makes the initial investment quickly recovered and has obvious economic benefits. But there are corresponding strict requirements in construction and operation management.

2. Energy saving ways shall be considered for equipment selection.
The design and selection of clean room process equipment must realize energy saving while meeting the requirements of mechanization, automation, program control and intelligence. Adopt chiller, fan, water pump and heat exchange equipment; adopt electrical equipment (including lighting) and reasonable wiring; reasonably configure equipment to prevent the phenomenon of big horse pulling small car; adopt return air cold (heat) recovery device and exhaust cold (heat) recovery device; adopt condensation heat utilization device of chiller under appropriate conditions; recover cold (heat) of production equipment; reasonably configure public power equipment, such as Adopt free cooling system, CCHP, etc.; select low resistance filter equipment, and the pressure head of fan and water pump should not be too high; take frequency conversion measures for electric equipment; consider energy efficiency, controllability, reliability, cost and effect for the selection of air conditioning terminal equipment. At the same time, necessary technical measures should be taken to reduce the heat and air volume of production equipment. For example, water-cooled equipment should be used as far as possible, and the heat insulation measures for production equipment and pipes in clean rooms should be strengthened to reduce heat emission and energy consumption.
3. Energy saving ideas shall be inculcated during construction.
(1) in the actual construction process, the installation personnel often consider more about the ease of operation of the construction and lack of energy-saving views. Only by paying attention to the construction quality can we ensure that the measures of energy saving and consumption reduction in the design can be implemented.
(2) strengthen the tightness of the system and reduce the leakage point of the system. The residual pressure of the purification air-conditioning system is large, so the high tightness of the whole system is required. Any leakage point in the system will cause the loss of energy. The important link to control the air leakage of the air duct system is the construction site, which should be checked from the production, assembly, installation and inspection of the upper layer of the air duct and components. At the same time, strengthen the air tightness treatment of maintenance structure, control the leakage of doors, transfer windows, etc.
(3) strengthen heat insulation. The construction and material selection of clean room wall, ceiling (or roof), doors and windows, as well as air pipes, water pipes, equipment, etc. shall be strengthened with heat insulation, and the heat insulation of floor materials shall be ensured for the room floor with special temperature requirements. In the construction of heat insulation, the quality and quantity of heat insulation materials must be guaranteed, and the construction process and quality must meet the requirements of the specification.
4. Energy saving and consumption reduction shall be emphasized in operation management.
(1) improve the quality of operation management personnel. Whether the designed energy-saving air-conditioning system can really save energy is closely related to the level of operation management and standardized operation. We should strengthen the professional training of operation management personnel, improve their professional quality, and implement the energy-saving target responsibility system.
(2) system maintenance shall be frequent and problems shall be solved in time. After the filter in the ventilation system runs for a period of time, the air pressure on both sides will increase, which will undoubtedly lead to the increase of resistance, energy consumption and equipment damage in the system. Therefore, the filter in the system should be cleaned or replaced regularly. If the pipeline insulation material is wet or damaged, the insulation performance will be reduced, and the energy loss will be inevitable, so it must be maintained or replaced in time. Pay attention to whether the heat exchange between the chiller and the surrounding environment is smooth, and ensure that the surface of the heat exchange fins is clean and free from corrosion. The maintenance personnel shall timely treat the water quality in the heat exchange system or clean the system to prevent the heat transfer effect from decreasing due to the scaling of the heat exchange system equipment.
(3) operate in strict accordance with the requirements of automatic control system. Energy saving measures and reliable automatic control system are inseparable, and automatic control system puts forward higher requirements for operation managers. Users and operation managers of the purification system should formulate a series of systems and measures to ensure the effective operation of the automatic control system, and take it as an important content of the correct operation and use of the purification air conditioning system, so as to achieve the purpose of energy saving and consumption reduction.
5. Other energy saving measures for clean air conditioning system.
(1) the fan on duty shall be used for operation during non working hours, and the fresh fan, circulating fan and exhaust fan in the system shall be closed.
(2) in the transitional season, the whole air system adopts the regulation mode of variable fresh air ratio.
(3) try to use natural energy as precooling and preheating of air conditioning system, such as solar energy, groundwater, soil energy, etc.
(4) using the preferential policies of ice storage and heat storage, etc.
High energy consumption has become an unavoidable reality in the operation of clean air-conditioning system. How to reduce the energy consumption of clean air-conditioning system undoubtedly puts forward higher requirements for our engineering technicians and managers, with more responsibilities and tasks, and a broader prospect.
Main energy saving measures of clean air conditioning system.
1. The design should have the concept of energy conservation.
In order to reduce the energy consumption of clean room, the planning and design of clean room is very important.
(1) try to choose the site with small air pollution and less dust production to build the plant; when the plant is arranged, the clean room should be arranged in the place with less pollution, pay attention to the arrangement of orientation, strengthen the setting of green belt, etc.
(2) the layout of the clean room shall minimize the area of the clean room or the area of the clean room with strict cleanliness requirements; the processes and equipment that can not be set in the clean room shall be set in the non clean area; the air cleanliness level of all kinds of rooms shall be properly determined, and the cleanliness requirements shall not be raised at will; the flow of people, logistics and auxiliary rooms shall be well organized; the clean room shall be selected in cooperation with relevant disciplines Room form, space layout, etc.
(3) reasonably determine the structure and material selection of wall and ceiling, pay special attention to the determination of enclosure structure and the selection of building materials, the structure and material selection of doors and windows; pay attention to the characteristics of clean room in the selection of facade and the number of doors and windows, avoid large windows and multiple windows to reduce the loss of cooling capacity.
(4) control the fresh air volume and exhaust air volume of the system. In the operation of the purification air conditioning system, the amount of fresh air largely determines the energy consumption of the system. In the design, the comfort factor of people is generally considered and the upper limit of the reference value is taken, but the operators are not many in the production, and the energy consumption caused by this is often ignored. All exhaust air volume in the system is generally supplemented by fresh air. The exhaust air volume shall be adjusted according to the indoor working conditions. The exhaust air volume can be controlled within an appropriate range, which can not only meet the requirements of process conditions for exhaust air, but also reduce the fresh air volume consumed by the system, and reduce the cooling and heat consumption of the purification air conditioning system for fresh air treatment. Centralized treatment shall be adopted for fresh air as much as possible, which is also conducive to the application of groundwater precooling, dust removal and humidification.
(5) reduce the resistance of the system as much as possible in the pipeline design. In the pipeline design, the resistance of the system can be reduced, and the power consumption of the air supply can also be reduced. Try to avoid long-distance air supply, shorten the length of air duct and reduce the resistance of air duct components such as elbows and tees. On the premise of meeting the requirements of wind speed, the resistance of filter can be reduced by using low wind speed to supply air and selecting appropriate wind speed.
(6) adopt secondary return air treatment. In order to reduce the power consumption, the return air shall be used as much as possible through sub filtration under the condition of avoiding cross pollution. The secondary return air can not only meet the requirements of temperature, humidity and cleanliness, but also greatly save the energy consumption of the air conditioning unit. The operation cost of the air conditioning unit can be saved about 2 / 3. Compared with primary air return system, secondary air return system can not only save equipment investment, but also reduce operation cost.
(7) adjust temperature and humidity according to different seasons. On the premise of meeting the production process, from the perspective of energy saving, it is necessary to determine the appropriate cleanliness level, temperature, relative humidity and other parameters.
(8) reduce the number of air changes in the clean room. On the premise of ensuring the clean effect, reducing the number of air changes and air supply is one of the important means of energy saving. The number of air changes is closely related to the production process, the advanced level and layout of equipment, the size and shape of the clean room, and the density of personnel.
(9) reduce the lighting intensity properly. The premise of clean room lighting is to meet the physiological and psychological requirements of workers. For high illuminance operation points, local lighting can be used, rather than improving the low illuminance standard of the whole workshop.
(10) comprehensive utilization of clean air flow. The heat recovery of process and air conditioning system is an energy-saving measure that can benefit directly. For the clean room of the pharmaceutical factory without the influence of dust particles, the clean air flow is connected in series, and the clean room is connected in series according to the cleanliness. The initial air supply is sent to the low-level room separately and then returned to the air conditioning unit, which can save several filters. For rooms that mainly eliminate waste heat and have low purification requirements, the clean air flow can be cross used and the flow direction of down supply and up return can be adopted. Down supply can reduce the air supply speed, improve the air supply temperature and reduce the temperature difference, while the up return can increase the return air temperature.
(11) consider heat recovery. In the design, the heat recovery device shall be selected. For the system with large exhaust air volume, the energy of exhaust air can be recovered to the fresh air through the rotary heat exchanger or tubular heat exchanger and the principle of heat exchange, so that the fresh air can be pretreated. It is estimated that this can save more than 25% of the operation cost, which has considerable economic significance.
(12) realize automatic control of air conditioning system and frequency conversion regulation of motor. Generally, the environment of clean room purification system can be divided into two periods: operation time and maintenance time. The requirement of cleaning time for air conditioning system is relatively simple. The design of automatic control and fan frequency conversion regulation can meet the different requirements of these two time periods, although in the early stage