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,  空调节能技术英文文献和中文翻译(3):http://www.youerw.com/fanyi/lunwen_31576.html