Dissertation > Industrial Technology > Building Science > Housing construction equipment > Air-conditioning, heating, ventilation,and its equipment > Air-conditioning

Study on Optimization of Allocation for Central Air-conditioning System

Author FengXiaoMei
Tutor JianQiFeiï¼›ZuoZheng
School South China University of Technology
Course Power Machinery and Engineering
Keywords Central air conditioning system Configuration Variable flow Simulation
Type Master's thesis
Year 2010
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Central air conditioning systems account for a large proportion of energy consumption in the building energy consumption, accounting for about 65% of the total energy consumption of the building. For central air conditioning, affect its energy consumption in addition to the performance of the device, the system form two aspects of system configuration and operating mode. In this paper, energy-saving system for the study of the target, optimize the allocation of central air conditioning system design level. In this paper, an office building in Shenzhen, for example, the configuration from the Run mode and program analysis of the central air-conditioning energy-saving potential, specific in-depth study of the following four questions. First, with regard to the choice of the chiller, With the help based on dest software to calculate the dynamic load of the air-conditioned office building cooling season, according to the characteristics of the chiller configuration status and building air-conditioning load, three representative technically more reasonable chiller configuration. Different operating modes and configuration program, multiple chillers annual power consumption and COP two indicators, and proposed an energy-saving way of chillers; Second, the variable flow of chilled water, discussed a pump chilled water system energy efficiency, by comparing the fixed pump flow and variable flow operation the annual power consumption of the chilled water system to evaluate the pump chilled water system with variable flow running energy-saving potential. Third, the study on the variable flow of cooling water caused the chiller to cool the inverter pump speed and pump system annual energy savings to changes in order to optimize the objective function of the variable flow control on the pump and the unit energy consumption affected. Obtained under different control modes operation conditions throughout the year as well as different loading rate of the cooling water system energy consumption, based on the optimal control method. Fourth With Smulink software on a central air conditioning system dynamic simulation, to simulate different load demand conditions the energy consumption of the central air conditioning system, the simulation results were compared with existing literature. Finally, further research work were briefly discussed. Through the above study three conclusions: First, the average load operation mode chiller configuration options are more energy-saving operating mode is started by one, and the use of chillers ranging from capacity allocation scheme compared to other energy-saving capacity configuration program, ranging from The capacity configuration program for the most energy-saving programs, capacity configuration program than 1 save 2.74% of the annual power consumption of the annual consolidated COP of 6.22. Second, chilled water system uses a pump variable flow operation system saving effect is remarkable. Annual saving rate of 28.08% than the constant flow operating system. Third, the cooling water system with variable flow run is feasible, and significant energy saving effect. Set the temperature control minimum differential pressure control is relatively energy-efficient variable flow control with constant flow control comparison, the annual energy-saving rate of 6.07%.

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