District Energy & Thermal Network Equipment calculator
Thermal Storage Size Calculator
Estimate usable thermal storage energy for chilled-water, hot-water, or stratified tank systems and the value of discharged storage during a peak period. Compare two equipment scenarios side by side and watch the cost per piece move.
What this calculator does
- Estimate usable thermal storage energy for chilled-water, hot-water, or stratified tank systems and the value of discharged storage during a peak period.
- Use it when thermal storage size in district energy and thermal network equipment is being quoted and energy is a real chunk of the district energy and thermal network equipment cost stack.
- Turns usable storage discharge capacity, storage discharge duration, stored energy value into a energy cost for thermal storage size in district energy and thermal network equipment.
Formula used
- Usable thermal storage energy = usable storage discharge capacity × storage discharge duration
- Value of usable stored energy = usable thermal storage energy × stored energy value
- Stored energy value per volume or tank = value of usable stored energy ÷ storage volume or tanks represented
Inputs explained
- Usable storage discharge capacity: Use deliverable heating or cooling output after tank stratification, heat exchanger, temperature limits, and pump constraints.
- Storage discharge duration: Enter hours the tank can support peak shaving, outage ride-through, or demand shifting at the stated output.
- Stored energy value: Use avoided peak electric, avoided boiler/chiller energy, time-of-use differential, or purchased energy value.
- Storage volume or tanks represented: Use tank volume, connected storage modules, or tank count included in the sizing estimate.
How to use the result
- Use it when thermal storage size in district energy and thermal network equipment drives meaningful kWh and the quote needs to reflect it.
- Demand charges, power factor penalties, and time-of-use windows are not modeled; treat the result as a baseline.
Common questions
- What problem does this thermal storage size calculator solve? Estimate usable thermal storage energy for chilled-water, hot-water, or stratified tank systems and the value of discharged storage during a peak period. You get a energy cost you can defend before quoting, scheduling, or sign-off.
- Which inputs change the energy cost the most? usable storage discharge capacity, storage discharge duration, stored energy value usually move the energy cost most. Pull from measured district energy and thermal network equipment runs, supplier data, and recent quotes rather than memory.
- What do I do with this number? Use the cost per piece to compare equipment options before you sign a PO.
- What should I verify first? Confirm the energy rate against a recent invoice including demand and time-of-use charges.
Last reviewed 2026-05-12.