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62 TRG-TRC011-EN
notes
period six
Review
Period Three explained the part-load operation of the absorption chiller. It
described the use of energy valves, burner controls, throttling and bypass
valves, and adjustable-frequency drives as methods for controlling the capacity
on the chiller. Valves and AFDs are used to vary the flow rate of solution to the
generator. Modulating energy valves and burner controls are used to vary the
heat input to the generator.
It also introduced the concept of crystallization, which occurs when the
absorbent solution becomes saturated and the salt begins to leave the solution
as a solid. Causes of crystallization include: air and other noncondensable
gases leaking into the chiller, cooling water that is too cold or that fluctuates in
temperature too rapidly, and an electric power failure. In most modern
absorption chiller designs, high-quality construction, smart microelectronic
controls, and automatic purge systems are extremely effective in avoiding
crystallization. Additionally, most absorption water chillers include devices that
allow the chiller to recover in the event that crystallization does occur.
The operation of the purge system as a means of removing air and other
noncondensables from inside the chiller was also presented.
▲
◆ Vary solution flow to generator
◆ Vary heat input to generator
▲
◆ High-quality construction
◆ Microelectronic controls
◆ Automatic purge systems
◆ De-crystallization devices
▲
Figure 71