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Results

Table 1 summarizes ranges of absorption chiller input parameters and corresponding ranges of resulting performance parameters:

Performance experiments and results
Table 1. Performance of the steam absorption chiller for different parameters, operating conditions

In addition, a detailed, computerized  model of the chiller was programmed based on its fundamental scientific and engineering principles.  This model involves all of the chiller components and the properties of the streams among them and also the streams entering and exiting the chiller (shown in Flow Diagrams).  This model has 416 variables which are evaluated using 409 equations and seven initial conditions.  It has been validated using the experimental data.  The model can be used to

* evaluate expected and achieved performance resulting from any changes in the design and operating conditions of the installed chiller

* evaluate expected and achieved performance for any new chiller installed at the IW or elsewhere

* serve as a component model in a larger model of the integrated systems of the IW.

The model has also been extended to include other driving heat sources, including, for example, hot water from solar thermal sources, direct natural gas firing, and exhaust gas from a bioDiesel fueled generator.               


Additional information can be found in the thesis of Hongxi Yin "An Absorption Chiller in a Micro BCHP Application: Model based Design and Performance Analysis" (pdf) (Appendix 1A, 2A, 2B, 3A, 4A)