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Whenever you walk behind a building and find a unit that has large quantities of water running through a plastic mesh, you will know you have found a cooling tower!
In many office complexes and college campuses, cooling towers and air conditioning equipment are centralized, and chilled water is routed to all of the buildings through miles of underground pipes.
Based on dynamic load track central air-conditioning system entire closed loop energy conservation technology research.
1. introductions
The energy conservation may say is the building character automatic control system starting point and the home to return to. It is well known, in the intelligent construction, HVAC (heating, ventilates and air conditioning) the system consumes to have to occupy the building consumption total energy enormous partial proportions, approximately about 50% ~60%. Specially cold: East the unit, the cooling tower, the circulating water pump and the air conditioning unit, the new atmosphere unit, all are consumes energy the big household. Therefore really has essential develops one effective air-conditioning system energy conservation method, especially uses is in improves in the existing building air-conditioning system automation the aspect. DDC (Directdigitalcontr01) the direct of numerical control, is a structure simple operation easy control device, it may borrow by the connection switches over the equipment to make the systems control along with the load change, like the air conditioning cold water circulatory system, the air conditioning box frequency conversion automatic amount of wind adjustment and the cooling tower radiation ventilator frequency conversion holds controls and so on, may let an air-conditioning system more effective revolution, like this, not only brings the very big economic efficiency for the estate management, moreover also may cause the system to move under a better operating mode, thus lengthens the equipment the service life as well as achieved provides goal of the comfortable air conditioning environment and the energy conservation.
The general building commonly used air-conditioning system has CAV, VAV, VWV and so on, respectively has differently holds controls the way, all may use DDC to control.
1 decides the amount of wind system (ConstantAirVolume, is called CAV).
Decides certainly the amount of wind system the amount of wind which blows out for the air conditioner certainly, provides coldly (is warm) the gas which the air conditioning region needs. When air conditioning region load variation, then changes the blast temperature to deal with in the room to shoulder, and achieves the maintenance indoor temperature to the comfortable area request. 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.
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