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1、普传变频器在中央空调水泵中节能方案（Energy saving scheme of universal frequency converter in central air conditioning water pump）First, the central air conditioning operation control method analysisThe design of central air conditioning system is based on the outdoor meteorological parameters and indoor air condition
2、ing design parameters to calculate the cold load. According to the characteristics of the partition structure, according to the product sample to choose the appropriate equipment, combined into a system. But most of the air conditioning system is working under the condition of dissatisfaction load.
3、The system energy efficiency ratio will be greatly reduced when the control mode of the dissatisfied workload is unreasonable. Now the air conditioning system in operation regulation, water system is mainly valves (manual, automatic regulating valve), the host uses unloading mode, which is at the ex
4、pense of energy consumption to meet the requirements of terminal load resistance, resulting in high cost of running.If the use of variable frequency control, energy transfer and transportation control for variable water volume (VWV) and variable air volume (VAV), and the transfer and transport coupl
5、ed with optimal temperature replacement, its power is only 3060% and other control system, energy saving is a double effect, because of the demand of energy consumption of refrigeration and falling. The host using the energy saving control frequency, keep the physical amount of refrigerant movement
6、under design conditions (such as the temperature, pressure changes, etc.) than other energy load regulation is obvious, such as G (YORK) type YT centrifugal chillers, frequency conversion unit under partial load energy efficiency can be reduced to 0.2kw/ tons of cold, visible and variable frequency
7、control in the air conditioning system has very broad application prospects.In the past, due to the price reasons, it is difficult to popularize the frequency conversion technology in the central air conditioning system. In the frequency conversion technology, computer automatic control technology i
8、s very mature today, with the combination of technology and the technology of HVAC, it is not a high technology, in the small power air conditioning in the economy can bear, but should not be a problem in the central air-conditioning system: (1) the central air-conditioning running time, such proble
9、m is more prominent; (2) the frequency control cost proportion in the whole system is not high; (3) inverter capacity is more big, the lower price per kilowatt power.Central air conditioning system using frequency converter is feasible, its investment recovery is generally in 612 months, with variab
10、le frequency controller life span of 10 years, its net income is more than 10 times the amount of investment.Two, central air-conditioning speed regulation energy saving principleRefrigerator compressor by compressing the refrigerant into the heat exchange with the cooling water of the evaporator li
11、quid evacuation, the chilled water cooling, chilled water pump will be sent to the chilled water cooling coil fan outlet, a fan blowing cold air cooling purpose is achieved. After evaporation of the refrigerant after releasing heat in the condenser, heat exchange with the cooling water, the cooling
12、water pump will bring the heat to the cooling water cooling tower by tower fan on the spray cooling, heat exchange with the atmosphere, the heat is emitted into the atmosphere.The old operating system for star delta starting full pressure operation, the air conditioning unit in full load condition,
13、the system is not in the starting motor when the smooth start, starting when the impact on the grid, a long time will cause the decrease of insulation frequent starting of motor, the motor temperature rise too high, in the process of operation is not effective according to the demand of office build
14、ing and ward, to effectively regulate the temperature, only the maximum amount of feed frequency, it will inevitably cause a waste of energy.After changing frequently, it can automatically adjust the flow rate of refrigeration pump and cooling pump according to the demand of room cooling and heating
15、, so as to achieve the goal of energy saving and consumption reduction.(1) due to the cooling water circulation pump operating frequency for full load, the refrigeration cycle in the early and late period of low ambient temperature, temperature of cooling water return is low, will cause the lithium
16、bromide crystal, which leads to the decrease of the air conditioning unit efficiency, and even protection. With the constant frequency difference control, the backwater temperature can be effectively controlled, which will greatly improve the efficiency of the air conditioning unit and achieve the goal of energy saving(2) because the chilled water circulating pump is running at full power frequency, it can not adjust the flow automatically according
