ed objects ............................................ 14 Р 1.3.2 Research on controller structure and algorithm ....................................... 17 Р 1.3.3 Research on optimal control method based on reference model .............. 20 Р 1.4 Analysis on several key issues in control process of variable water flow Р system ........................................................................................................... 20 Р 1.5 Main research content and structure of the dissertation.................................. 22 РChaper 2 Most unfavorable thermodynamic loop and thermodynamic stability Р in air-conditioning water system .......................................................... 24 Р 2.1 Analysis on regulating issues based on most unfavorable hydraulic loop in Р - IX -