In the HVAC industry, there are two basic approaches to evaluating central-chiller-plant performance: single-number evaluation methods, such as integrated part-load value, and hour-by-hour analysis programs, such as eQUEST, TRACE, and EnergyPlus. With single-number evaluation methods, chiller and cooling-tower characteristics with potentially significant impacts on plant kilowatt demand can be missed,1 while hour-by-hour analysis programs tend to be complex and time-consuming,2 generally ...

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