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The commonly used central air-conditioning system is AHU (air conditioner) and the cooling water pipe system (the FCU system). These two generally decides the amount of wind (CAV) to supply the air conditioning area, in order to deal with in the room the partial loads change, decides the amount of wind system in AHU to change warm by the air conditioner blows of processes, controls in the general FCU system by cold water valve ON/OFF adjusts the blast temperature. 2 changes the amount of wind system (VAV) Changes the amount of wind system (VarlableAirVolume, is called VAV) is the air conditioner (AHU or FCU) may move changes the amount of wind. The commonly used central air-conditioning system is AHU (air conditioner) and the cooling water pipe system FCU system. These two generally decides the amount of wind (CAV) to supply the air conditioning area, in order to deal with in the room the partial loads change, decides the amount of wind system in AHU to change warm by the air conditioner blows of processes, controls in the general FCU system by cold water valve ON/OFF adjusts the blast temperature. However these two has wasted the massive energys on the blast system. Because in long-term low load time the air feeder also carries out the entire amount of wind revolution to consume the electricity, this not only is not easy to maintain in the stable room humidity the condition, also wastes the massive blasts revolution energy. Changes the amount of wind system is aims at the blast system to consume the electricity shortcoming the energy conservation countermeasure. Changes the amount of wind system to be possible to pide into two kinds: One kind is in the AHU wind tube system air conditioning adaptable amount of wind system (AHU-the VAV system); One kind is in the FCU system room wind adaptable amount of wind system (the FCU-VAV system). The AHU-VAV system will be blows of in the entire wind tube system the temperature to be fixed, but adjusts the air feeder to deliver the amount of wind the way to deal with in the room the air conditioning load change. The FCU-VAV system is fixed cold water supplyment , but FCU installs in the room does not have the section to change the power controller to change delivers the amount of wind, that is changes FCU the heat change rate to adjust in the room the load variation. These two ways penetration amount of wind adjustment reduces the air feeder the power consumption, simultaneously also may increase the heat source machine the operating efficiency to save the heat source to consume the electricity, therefore may simultaneously obtains the energy conservation effect in the blast and the heat source two aspects. 3 changes the current capacity system (VWV) So-called changes the current capacity system (VariableWaterVolume, is called VWV), is enhances the heat source machine by the certain water temperature supply air conditioner the efficiency, but changes by the special water pump delivers the water volume, while convenient achieves saves the effect which the water pump uses electricity. Changes the water volume system to depend on the water pump to the water pump system energy conservation efficiency the control mode and the VWV use proportion but different, whether there is the general VWV control mode section speed change (SP) and the bidirectional valve control mode. Above three kind of air-conditioning system is the present building air conditioning most often the system which designs. The central air conditioning control also is the pipeline, the fitting, the valve body or the valve centralism hypothesis control fluid provides the air conditioning. Therefore effectively combines the central air conditioning control namely to be able the active control to consume energy, the design conforms with the energy conservation the air-conditioning system. In recent years, the our country majority of areas, in particular southeast the coastal area summer the air conditioning energy consumption suddenly was rising, the air conditioning uses electricity the tendency which increases sharply to cause the electrical network power supply to be intense. Statistics have indicated, our country every year the burning hot season air conditioning consumed the electricity to occupy 1/3 in recent years which the entire society uses electricity, the massive electrical energies swallow by the industry and the civil construction air conditioning, in particular large-scale construction central air-conditioning system, like each kind of commercial construction (office, market, hospital, hotel and so on) central air conditioning because its space big,
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