Abstract
Taking an existing public building as an example, the mathematical model of each equipment module of the chilled station and the TRNSYS custom module are established on the basis of the measured data. The mathematical model of “chilled station cooling capacity—equipment power” is proposed and established. The full-frequency control strategy based on device contribution rate is proposed. The TRNSYS simulation platform is used to simulate a public building chilled station in the cooling season. The result shows that the seasonal energy efficiency rate of the public building air-conditioning system is 2.15 times as high as the original after applying the new control strategy.
Highlights
Thirty-two public buildings in China have been carefully investigated and the investigation results show that the current chilled station equipment of air conditioning system is mostly controlled by changing the number of operating devices manually, while the air conditioning terminal remains unchanged and the automatic control system is in a paralyzed state
It is equipped with a direct digital control system (DDC system) and automatic control system of air conditioners, with an airflow bypass valve provided between the inlet and outlet ducts
An innovative device contribution rate-based chilled station control strategy is proposed in this study, whose TRNSYS model was established to simulate energy consumption
Summary
Thirty-two public buildings in China have been carefully investigated and the investigation results show that the current chilled station equipment of air conditioning system is mostly controlled by changing the number of operating devices manually, while the air conditioning terminal remains unchanged and the automatic control system is in a paralyzed state. Chilled station automatic control system can significantly improve the energy-saving effect, the operation is more convenient and accurate. TRNSYS software can be applied to calibrate experimental data and simulate energy of the air conditioning system, thereby optimizing control strategy [15,16,17]. Scholars have done some research in order to improve the energy efficiency of the chilled station, currently focusing on variable flow control and variable water temperature control, which is lack of chilled station full frequency conversion with equipment frequency control strategy. The automatic control system of a public building was regarded as the object of study, the optimal control strategy for chilled station was studied thoroughly in this paper using TRNSYS software. The terminal regulation of the air conditioning system was not considered in this study
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