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With the continuous development of China\\ s national economy and people\\ s living standards rising, central air conditioning into the hotels, restaurants, industrial and mining enterprises, office buildings and other fields. The conventional central air conditioning system for selection and design in accordance with the maximum cooling and heating load. Throughout the year the hottest and coldest weather only a few days, and thus most of the time of the central air-conditioning is running below the unit rated load, part load condition, resulting in an enormous waste of the electricity, along with the development of science and technologyair conditioning vents, the drive has been widely used in all walks of life, its cheap, mature technology, especially for fan and pump energy-saving in the industrial field widely, the average saving in more than 30%.
A central air-conditioning energy saving best way to
The main equipment of central air-conditioning fan and water pump, so energy the best way is to use the drive. Most of the middle air-conditioning also uses the old control: by changing the compressor unit, pumps, fans, start and stop the number of units, in order to achieve the purpose of regulating the temperature.
The way to adjust the shortcomings of the concentrated expression of the following:
Equipment for a long time to fully open or fully closed, and take turns running, staggering waste of energy.
Motor direct power frequency start, the impact of current, seriously affecting the service life of equipment.
Poor temperature control effects. Environmental or cooling and heating load changes, can only increase or decrease the number of hot and cold water pump, or use the wind deflector to adjust the indoor temperature, temperature fluctuations, poor comfort.
Central air-conditioning inverter is used the following advantages:
Inverter soft-start motor, greatly reduce the impact of current and reduce the wear of motor bearings, extending bearing life.
Adjust the water pump and fan flow, pressure can be directly through to change the operating frequency of the inverter, baffles, valves can be reduced or canceled.
System power consumption is greatly decreased, and noise reduction.
The use of temperature closed-loop control system by detecting the ambient temperature and automatically adjust the air flow, with the weather automatically adjust the heat load changes, temperature changes, the adjustment.
System through the fieldbus with the central control room, networking, centralized remote monitoring.
Second, the water supply system variable frequency energy saving
Lithium bromide units or electric refrigeration unit (Freon) central air conditioning system, the energy consumption of the host\\ s own unit control, machine power consumption outside the group can not control this part of the cost is very high, but is often ignored . Especially lithium bromide unit, use of row cooling in the nominal state, outside the machine pumps, cooling tower motor power consumption, accounting for the overall energy consumption 30% of the cost (2 yuan per kg of oil per kilowatt basis). From the environmental point of view the user immediate interest point of view, central air conditioning system should be designed to the most energy-efficient systems. The inverter is used to control a machine outside the pump motor, cooling tower motor is the most simple and most effective energy saving measures. General saving 20% to 50% in annual savings of 12% to 20% of the total operating costs of the units and systems, is very alarming.
A cooling water pump variable frequency control
The power of the central air-conditioning cooling water pump is designed according to the compressor at full load of air-conditioning refrigeration units, refrigeration units do not need to open all the compressor when the ambient temperature and a variety of external factors, the amount of cooling the air conditioning condensing system correspondingly reduced, then you can adjust the speed of the cooling water pump through the frequency converter to reduce the speed and flow of the cooling water circulation, so that the cooling load of the cooling water to take full advantage of the condensing system, so as to achieve energy-saving purposes. The following data derived from our frequency energy-saving central air conditioning, cooling water pump, cold and warm water pumps in low-flow run-time, you can dramatically save power, especially for direct burning of cooling water flow characteristics of the curve, variable frequency control greater significance, from the lofty BZ-type direct burning central air conditioning system Haili Pu inverter control pump test data, for example:
When 75% of the cooling capacity of units required for the cooling water flow of 34%, the pump power consumption by about 20%;
When 50% of the cooling capacity of units required for the cooling water flow of 22%, the pump power consumption by about 15%.
2, the cold temperature and pump frequency control
The power of the central air-conditioning refrigerant pump is based on the work of the air conditioning at full capacity, when the air-conditioned hotel, hotels, and they need to cold or heat did not reach full capacity, then through the inverter is to adjust the refrigerant pump speed, reducing the circulation rate of the refrigerant water, cold and heat are fully utilized, so as to achieve energy-saving purposes. Refrigeration, heating sharing a water pump, the pump flow in winter only 50%, natural greatly save power; even if it is summer and winter wheel cylinder operation can also be appropriate to reduce the flow at low load season, such as the 90% flow, the power consumption of about 75%.
3, the cooling tower fan variable frequency control
Fan power is generally small, energy-saving as the pump obvious. But the fans take to the inverter control can greatly contribute to the cooling water thermostat, which is crucial for the unit cooling thermostat; and make the unit solution circulation stability, maximize fuel savings. The low-speed operation of the cooling tower fan can significantly reduce drift water, save water, slow down the deterioration of water quality, reduce the impact of mist around.
4, the use of the other benefits of the inverter
Inverter start, stop, crescendo, decrescendo type, can eliminate the impact of the motor to start on the grid. And avoid the failure of the motor due to overload.
Motor often in the low load operation can greatly extend the life of motors and pumps, fans, and at the same time does not start, stop impact, coupled with the reduction in the flow, the pipeline pressure and suffered from the impact force decreases, so the pipeline terminal equipment, valves, also play a protective role. Equipment, on the other hand, noise, vibration are reduced to protect the environment.
5, central air conditioning unit, the inverter control
/ Entrance temperature to change the pump speed, adjust the flow according to the cooling water out;
Change the cooling tower fan speed, adjust the water temperature according to the cooling water inlet temperature;
Change the pump speed, adjust the flow according to the cold-warm water temperature difference of import / export;
Change the pump speed, adjust the flow according to the temperature of the cooling water effluent;
According to the refrigerant return water temperature of the water to change the pump speed to regulate the tax flow;
Three, the end of the central air-conditioning equipment – VAV unit inverter control
VAV unit is also central air conditioning system, an important composition part, its performance (air flow, cooling capacity, noise, power consumption) of the pros and cons of variable air volume unit performance, more importantly, also depends on the control mode, control the performance, quality.
With the growing popularity of central air conditioning, variable air volume units adjust the controller has gone through three stages of development:
Phase I: damper adjustment. Can play a role in regulating the amount of wind electric energy consumption, noise.
Phase II: SCR variable voltage control. Can play to regulate air flow, cooling capacity, energy-saving role in the improving effect of noise variable air volume units, the drawback is the large volume, low reliability and stability, high failure rate.
Phase III: inverter control. The maximum to meet the VAV unit amount of wind, cold, noise regulation requirements, the more obvious energy saving effect, small size, high reliability and stability.
At present, the inverter controller with its unique advantages, being the central air-conditioning industry insiders favor.
