1.  Energy Management Strategies Time of day scheduling Optimum start/optimum stop Duty cycling Demand limiting Temperature reset 2.  Air Handling System Applications Fixed quantity of outdoor air Mixed air control Economizer cycle control of mixed air Control of modulating chilled water coil three-way valve VAV system with cooling and duct reheat 3.  Practical Scenarios Chilled water system control Example 1: Chilled water system with a chiller and a pump Example 2: Chilled water system with parallel pumping Example 3: Chilled water system with primary-secondary loop Air handling unit control Example 1: Constant volume single zone air handling unit control Example 2: Variable air volume air handling unit control

• Horan, T. J., 1997. Control Systems and Applications for HVAC/R, Prentice Hall, Upper Saddle River, N.J., pp. 260-264. [697 H811 c]
• Honeywell, 1991. Engineering Manual of Automatic Control: for Commercial Buildings - Heating, Ventilating, Air Conditioning, SI ed., Section on air handling system control applications (77-1200), Honeywell, Minneapolis, Minn., pp. 189-238. [697.9352 E5]
• Shadpour, F., 2001. The Fundamentals of HVAC Direct Digital Control: Practical Applications and Design, 2nd ed., Chapters 12 & 15, Hacienda Blue, Escondido, CA. [697 S52]

1. What are the typical energy management strategies for HVAC systems? Briefly describe their purposes and drawbacks. Apart from saving energy costs, what are the other benefits when implementing these strategies?

2. Describe the control arrangement for the following processes or systems. Comment on the effectiveness of using economizer cycle in air-conditioning system for the climate of Hong Kong.

Economizer cycle control of mixed air

Control of modulating chilled water coil three-way valve

VAV system with cooling and duct reheat

• Pratical examples of chilled water system control (Chapter 12)
• Pratical examples of air handling unit control (Chapter 15)