Modeling and Simulation of Chilled Water System for Central Air Conditioning

Abstract:

Considering the central air conditioning system is highly susceptible to interferences from external environment, this paper established a dynamic mathematical model for chilled water system with the air conditioning area, fan coil unit and air conditioning area interference factors. Selection of chilled water system as a controlled object, designed the energy saving control system for central air-conditioning. The inputs of PID controller are deviation of actual temperature and setting temperature, and the change rate of the deviation; output is operation frequency of pump. Experiment shows that, PID control system in 90% time operating at a frequency of 10Hz-40Hz, average is 32.5Hz. Compared with no control system, the pump power consumption was reduced 33.9%.In conclusion, PID control in the central air conditioning system have a good energy saving effect.

• Periodical: Applied Mechanics and Materials (Volumes 204-208)
• Pages: 4280-4285
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.204-208.4280
• Online since: October 2012
• Authors: Jian Min Sun*, Chun Dong Zhang, Ze Yang Zhou
• Keywords: Central Air Conditioning, Chilled Water System, Mathematical Modeling, PID Control

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