Integrating thermal energy storage
Thermal energy storage banks heat or cold when it is cheap or abundant and releases it when it is needed, decoupling the timing of energy supply from demand. It lets a plant generate during off-peak hours, capture surplus waste heat, or smooth a peaky load, using a hot or chilled medium as a buffer.
What it is
Thermal storage holds energy as the temperature of a medium — chilled water, ice, hot water, molten salt or a phase-change material. Integrating it means sizing a store and charging it from a heat or cold source at favourable times, then discharging it into the process when generation is expensive, constrained or simply out of step with demand. It turns a mismatch in timing into an opportunity.
Why it is done
Energy prices, grid constraints and waste-heat availability rarely line up with when a process needs heat or cold. Storage bridges that gap: chilling water overnight to shave a daytime electrical peak, banking surplus waste heat for a later batch, or letting a generator run steadily rather than chasing a spiky load. It can cut energy cost, reduce peak demand charges and improve the use of recovered heat.
How it is done
The demand profile and the timing of cheap or surplus energy are mapped to find the gap worth bridging, and a storage medium and size are chosen for the temperature and duration involved. The store is integrated with charging and discharging connections and controls that decide when to charge and discharge against price or availability signals. Heat losses are minimised with insulation, and the realised cost or peak saving is verified against the operating strategy.
- Map demand & price timing
- Select medium & size
- Integrate charge/discharge
- Configure dispatch logic
- Insulate the store
- Verify cost/peak saving
What to watch for
Oversizing the store ties up capital that the daily cycle never uses, while undersizing fails to cover the peak it was built for. Neglecting standing losses lets a poorly insulated store leak away the very energy it was meant to save.
Related practices
Running a compressed-air leak survey programme
Retrofitting waste-heat recovery
Retrofitting variable-speed drives
Related topics
Demand Response · Specific Energy Consumption (SEC) · Thermal Insulation
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