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- Title
Energy Saving Measure Interactions in Chilled Water Systems.
- Authors
Doty, Steve
- Abstract
In energy audit reports, many items are considered. Values of cost and savings are listed for each energy conservation measure (ECM), with its unique payback period. Listing measures separately provides a means for the customer to sort options based on payback, magnitude of improvement, or available capital. While this “shopping list” approach is desirable, it is flawed when ECMs do not act independently, e.g. when the savings amount of one ECM depends on another ECM being implemented. Few energy systems act alone and minor effects can be ignored, but when interactions are significant, presenting ECM results in defined combinations is appropriate. The foundation of all energy management proposals is system knowledge. Understanding chilled water system behavior paves the way for effective ECM application. This article discusses the classic primary-secondary chilled water pumping arrangement with multiple chillers, and it points out several interacting ECMs: • Excess chilled water pumping at any location creates added heat and chiller load. • Variable primary flow creates a trade-off between pump energy and chiller energy, and the same is true for variable condenser water flow. • Excess secondary pumping (distribution) creates corresponding high primary flows. • Low chilled water differential temperature (dT) causes high chilled water flows, excess chiller run time, and low chiller loading at inefficient operating points.
- Subjects
ENERGY conservation; WATER distribution; SAVINGS; COST; PAYBACK periods; PUMPING stations; TEMPERATURE; MANAGEMENT
- Publication
Energy Engineering, 2011, Vol 108, Issue 5, p7
- ISSN
0199-8595
- Publication type
Article
- DOI
10.1080/01998595.2011.10412159