Comprehensive Performance Simulation Of Joint Operation Chillers

Proportion of central air-conditioning system energy consumption accounts for the building energy is about 60%, and the chiller energy consumption accounts for about 40% of the energy consumption of the central air-conditioning system. For combined operation of central air-conditioning, the main factors affecting energy consumption include performance of the equipment, operation strategy and equipment configuration. In the paper, the comprehensive performance of combined operation chiller is took as the research object, Trnsys software used to establish the model and do simulation analysis of system energy consumption annual dynamic.In this paper, taking an office building in Hefei for example, study the comprehensive performance of combined operation of central air-conditioning from the point of the operating mode and program configuration. The main research is as follows: First, on the basis of the actual chiller configuration scheme, taking chiller energy consumption and COP as the main object of study, propose different operation scheme of chillers, cooling water pumps, chilled water pumps so as to achieve the best efficiency and maximum energy saving effect; Second, according to the load characteristics of the building throughout the year, propose a reasonable chiller configuration, and research influence of chiller configurations in the energy consumption of the system under the same running strategy.Studies have shown that:(1) Chillers using the average load method can be more energy-efficient than those using method to open one by one;(2) When chillers use the average load method, chilled water pumps with variable flow operation saving 19.6% than those with constant flow operation,reducing overall energy consumption of air-conditioning.(3) The analysis of cooling water pump respectively by constant flow operation and constant temperature difference variable flow operation scheme found that the latter has not only significant energy saving effect but also good operation reliability.(4) According to the real-time dynamic load of the building to make the cold water chiller scheme, t The asymmetric chiller configuration energy saving effect is good, especially in low load range, open the rated cooling capacity of smaller chillers, ensure high performance of air-condition system.(5) Study of which chilled water outlet temperature of combined operation chillers energy consumption indicates when chilled water temperature rises, chiller COP increases. Without prejudice to the case of indoor comfort, improve the chilled water outlet temperature to save energy.(6) Study of which chilled water outlet temperature of combined operation chillers energy consumption indicates when cooling water temperature rises, chiller COP fell, and the situation is obvious.