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TRG-TRC016-EN 105
period five
Review
notes
Period Three reviewed several variations in the design of chilled-water systems.
These variations may allow the system design engineer to provide added value
to the building owner and operator in the areas of improved reliability, greater
flexibility, reduced installed costs, and lower operating costs.
Topics included:
n Hybrid chilled-water systems using chillers that operate on different fuels
n Low-flow systems that use lower chilled-water temperatures and lower flow
rates
n Variable-primary-flow systems that are designed to vary the water flow
through the chiller evaporator
n Configurations that allow a chiller to be preferentially loaded, specifically
in the case of a high-efficiency, heat-recovery or alternate-fuel chiller
n Heat-recovery chillers that are capable of providing heat to another part of
the system
n Asymmetric system designs using chillers of different capacities or
efficiencies, such as the “swing” chiller concept
n Several “free” cooling options that reduce cooling energy costs
n Applications in which the required conditions are outside of the normal
operating range of the chiller
Review—Period Three
▲ Hybrid systems
▲ Low-flow systems
▲ Variable-primary-flow systems
▲ Preferential loading
▲ Heat recovery
▲ Asymmetric design
▲ “Free” (reduced-energy) cooling
▲ Application of a chiller outside its normal
operating range
Figure 114