HVAC 4.pptx - Energy Management in HVAC Systems Part 4 Thermal Energy Storage niversity of Jordan UJ Outline • Introduction to peak load shifting •

HVAC 4.pptx - Energy Management in HVAC Systems Part 4...

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niversity of Jordan - UJ Energy Management in HVAC Systems Part 4: Thermal Energy Storage
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niversity of Jordan - UJ Outline Introduction to peak load shifting. Thermal energy storage (TES) concepts. Types of TES systems: Full storage Partial storage Storage mediums: Chilled water Ice System capacity and sizing Examples
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niversity of Jordan - UJ Introduction A majority of the technology developed for energy management has dealt with the more efficient consumption of electricity, rather than timing the demand for it. The management of demand charges deals very little with conservation of energy, but mainly with the ability of a generator to supply power when needed. It is this timing of consumption that is the basis of demand management and the focus of thermal energy storage (TES).
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niversity of Jordan - UJ Introduction Experts agree that demand management is actually not a form of energy conservation but a form of cost management. Throughout the 1980’s and most of the 1990’s, Demand Side Management (DSM) was done by utilities in order to manage generating capacity and costs by promoting demand reduction though incentives (financial rewards) and disincentives (rate structures). Demand costs, and thus demand management, will remain an important cost control strategy for utilities and the energy users.
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niversity of Jordan - UJ Introduction Utilities often charge more for energy and demand during certain periods in the form of on-peak rates and ratchet clauses. Utilities often utilize the most efficient generating units at first, since these units have the lowest costs (ultimately the actual cost of energy). When the loads are approaching the connected generation capacity of the utility, additional generating units must be brought on line. Each additional unit has an incrementally higher cost since these “peaking units” are less efficient and are used less often.
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niversity of Jordan - UJ Thermal Energy Storage (TES) Thermal energy storage (TES) is the concept of generating and storing energy in the form of heat or cold for use during peak periods. A cooling storage system could be implemented to reduce or eliminate the need to run the chillers during the on-peak rate period.
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niversity of Jordan - UJ Thermal Energy Storage (TES) By running the chillers during off-peak hours and storing this capacity for use during the on-peak hours, a reduction in energy costs can be realized. If this type of system is implemented during new construction or when equipment is being replaced, smaller capacity chillers can be installed, since the chiller can spread the production of the total load over the entire day, rather than being sized for peak loads.
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