Trane TRG-TRC011-EN manual Review

period six

Review

notes

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◆Vary solution flow to generator

◆Vary heat input to generator

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◆High-quality construction

◆Microelectronic controls

◆Automatic purge systems

◆De-crystallization devices

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Figure 71

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.

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