Chilled Water Thermal Storage Tank Supplier: Choosing Chilled Water vs Ice TES

Not all thermal storage is a big water tank. A chilled water thermal storage (TES) supplier should help you decide between stratified chilled-water storage and ice storage before anyone sizes a vessel, because the choice changes the chiller, the footprint, and the operating cost. This article is the supplier's guidance on that decision.

A stratified tank stores chilled water in layers, cold at the bottom and warm at the top, separated by a thermocline maintained by a diffuser. It uses the existing chiller temperature range, is simple, and is cheap per kWh of storage. For most sites it is the lowest-risk choice and the one a supplier should propose first.

• Layers via diffuser thermocline.
• Uses existing chiller range.
• Cheap per kWh stored.
• Default low-risk choice.

Ice storage makes and melts ice, storing roughly 5-7 times more cooling per volume than water at a useful delta-T, but it requires chiller water around 0 C and extra compressor lift, which costs efficiency and energy. It suits sites where land or height is the hard constraint, not where energy cost dominates.

• High density per volume.
• Needs ~0 C and extra lift.
• Costs chiller efficiency.
• Wins on footprint only.

Beyond technology, the storage strategy matters: full storage charges completely off-peak and runs chillers little by day, while partial storage keeps chillers running at a reduced peak, shrinking the tank. Partial storage often balances capital and operating cost better than either extreme.

• Full: chillers off-peak only.
• Partial: reduced daytime peak.
• Partial often best balance.
• Strategy sets tank size.

A good supplier asks for your space constraint, chiller temperature range, and tariff before recommending a technology, not after. The table contrasts the two on the factors that matter to a specifier.

• Ask space and chiller range.
• Ask tariff before recommending.
• Contrast density and lift.
• Recommend, do not assume.

We have no chilled water TES or data-center project in this library, and no ice-storage project at all. The coated and thermal-storage tanks cited (Sardinia 30,549 m3, Italy warm-water 1,200 m3) are analogous industrial deliveries, not TES or data-center projects.

• No CW-TES / ice in library.
• Citations analogous, not claims.
• Stratified build is real.
• Technology choice needs your spec.

Stratified chilled water, because it is cheap per kWh and uses the normal chilled-water range; ice is the exception for tight footprint, not the default.

Generally no; it needs chiller water near 0 C and extra lift, costing efficiency. It saves space, not energy.

A strategy where chillers keep running at a reduced daytime peak and the tank is smaller than full storage; it often balances capital and operating cost.

Ice storage requires chillers capable of lower temperature and higher lift; stratified water uses the normal chilled-water range.

Yes, for your space constraint, chiller temperature range, and tariff, because those decide whether water or ice is right.

Not in our project library, and we hold no ice-storage project. We cite large coated and thermal-storage tanks as analogous capability, not TES or data-center deliveries.

A chilled water TES supplier should start with technology choice, not tank size. Stratified chilled water is the default for low cost per kWh and works within the normal chiller range; ice storage trades efficiency for footprint and only wins where land or height is the hard limit; partial storage often balances capital against operating cost. The supplier's job is to ask for your space, chiller range, and tariff before recommending, because the right technology, not the biggest tank, decides the project's economics.