Shenzhen Central Business Plaza, central air-conditioning energy saving program 

 I. Project Introduction 

 Shenzhen Central Business Plaza, central air conditioning system consists of rt1-rt3 and rt4 system components, rt1-rt3 system consists of three eccentric host, composed of 4 chilled water pumps 55kw, 4 chilled water pumps and cooling water pump 4 with three runs with a way to prepare , which is frequency operation. Rt4 system consists of a host in the dry form 2 sets 30kw cooling water pump, 2 sets of 2 sets of chilled water pumps and cooling water pump in a run with a prepared, which is frequency operation. Due to seasonal, climate, and the user changes the amount of air is also constantly changing, the frequency of the chilled water pump running and cooling water pump can not root the amount of air conditioning chilled water and cooling water, causing a great waste of energy, so be on the chilled water pump and cooling water pumps for energy saving. 



 Second, the air conditioning system structure and working principle 

 As shown, central air conditioning system consists of the following components: 

 1. Freezing unit: This is the central air-conditioning "cooling source", leading to each room unit for circulating water from the frozen "internal heat exchange", cool as a "frozen water." 

 2. Cooling towers: freezer unit used to provide a "cooling water." 

 3. "External heat exchange" system: the circulatory system consists of two components: 

 A. Cold East water system: pump and chilled water pipes from the frozen composition. Outflow from the chiller chilled water chilled by the chilled water pump pressure into the pipes, the heat in each room, so that the room temperature drop. Outflow from the refrigeration unit, the chilled water into the room referred to as "water"; through all the rooms and returned to the chilled water chiller tube called a "backwater" 

 B. Cooling water system: the cooling pump, cooling water pipes and cooling towers. Refrigeration units for heat exchange, so that the cooling water temperature at the same time, will release a lot of heat. The heat absorbed by cooling water, the cooling water temperature. Increase of the cooling pump pressure into the cooling temperature of the cooling tower, cooling tower make the exchange with the atmosphere, and then drop the temperature of the cooling water, sent back to the refrigeration unit. This constant cycle, taking the heat from the cooling unit release. 

 It can be seen, central air conditioning system work is an ongoing process of heat exchange in the energy conversion process.. Here, the chilled water and cooling water circulation system is the main energy carriers. Therefore, chilled water and cooling water circulation system of control is central air-conditioning system an important part. 

 Central air conditioning, Shenzhen Central Business Plaza, the external heat exchange by the two circulating water system to complete. Circulating water system and into the backwater (a) water temperature difference, reflecting the need for heat exchange in the heat. Thus, according to the backwater and into (out) to control the water temperature difference between the circulating water flow rate, thus controlling the rate of heat exchange is more reasonable to control side