| 摘要 |
In a first embodiment, an absorption chiller including a generator (26) and an absorber (24) is provided, with at least one stream of concentrated absorbent solution flowing from the generator (26) to the absorber (24). Separate flows of the concentrated absorbent solution are delivered to the surface contact portion (24a) of the absorber (24) and to a reservoir (24c), which may be the absorber sump. The chiller capacity is controlled by varying the flow rate ratio of absorbent solution flowing to the surface contact portion (24a) of the absorber (24) versus the reservoir. A controller (118) adjusts the flow ratio of absorbent solution to achieve the desired refrigeration capacity. In a second embodiment, a crystallization detection and recovery method for a two-stage absorption refrigeration machine (400) is provided. Crystallization in the low temperature heat exchanger (426) is detected through temperature comparisons between certain absorbent solution flows. The recovery sequence includes steps to remove crystallization and to prevent subsequent occurrences. Finally, in a third embodiment, a control system (500) for controlling overshoot in response to a setpoint input (515) to the control system (500) is provided. The control system (500) includes a feedback loop (505) connected to the control system (500) via a summing node (508); and a binomial filter (310) arranged to receive a setpoint input (515) and to provide a filtered setpoint output (520) to the control system (500) via the summing node (508). The control system includes the binomial filter (510) to provide a filtered setpoint output (520) having a gradual initial response to the control system via the summing node (508). A method of controlling a water chiller system using the control system (500) to provide a supply of leaving water at a preselected temperature is also provided. |
