How to Size a Data Center Thermal Energy Storage Tank: Cooling Energy and dT
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How to Size a Data Center Thermal Energy Storage Tank: Cooling Energy and dT
To size a data center thermal energy storage tank, take the cooling energy (kW x hours of cover) and divide by (rho x cp x chilled-water dT) to get volume; add loss margin and round to a practical diameter and height. The cooling profile, not a rule of thumb, sets the size.
Sizing a data center thermal energy storage tank starts from the cooling load you want to shift and the chilled-water temperature difference available.
Technical Explanation
Cooling energy
· Multiply the shifted cooling load by the hours of peak or resilience cover; this is the stored cooling energy target.
· Load profile sets it.
Temperature difference
· Use the chilled-water supply-return spread, typically several kelvin; a wider, plant-safe dT stores more per cubic metre.
· dT is the lever.
Margin and geometry
· Add standby-loss margin for the hold time and choose diameter/height within transport and foundation limits.
· Margin makes it real.
Technical Specifications
Table 1 - Data center specification factors
Input | Source | Effect |
Cooling | Profile | Energy |
dT | Plant | Volume |
Loss | Duration | Margin |
Geometry | Limits | Tank |
Verify | Design | Confirm |
Project Case Study
Project Case Summary - delivered water storage tanks
The deliveries below are representative bolted water and fire-protection storage tanks in glass-fused-to-steel, fusion bonded epoxy and stainless steel construction, with capacity, location and completion date recorded for each order. They illustrate the company's delivered capability for the type of tank discussed in this article.
Project | Application | Capacity | Construction | Roof | Completion |
Trinidad and Tobago | Potable water | 22,892 m3 | Glass-fused-to-steel bolted | Aluminium dome roof | 2026 |
Brazil | Potable water | 11,713 m3 | Glass-fused-to-steel bolted | Aluminium deck roof | 2025 |
Costa Rica | Potable water | 11,756 m3 | Glass-fused-to-steel bolted | Aluminium dome roof | 2025 |
Company Expertise
Center Enamel (Shijiazhuang Zhengzhong Technology Co., Ltd) manufactures bolted data center thermal energy storage tanks in glass-fused-to-steel, fusion bonded epoxy and stainless steel, engineered to AWWA D103-09 with the enamel coating process controlled to ISO 28765.
Center Enamel sizes data center thermal energy storage tanks from the cooling load profile and temperature difference.
Frequently Asked Questions (FAQ)
Q: What is the DC TES sizing formula?
A: Volume = cooling energy / (rho x cp x chilled-water dT); about 1.16 kWh/m3.K for water.
Q: What dT do I use?
A: The chilled-water supply-return spread your plant can maintain.
Q: How many hours to cover?
A: Set by demand-charge window or resilience target.
Q: Does loss change size?
A: Yes - longer holds need more margin.
Q: Diameter or height?
A: Pick diameter for transport, set height from volume.
Q: When involve an engineer?
A: For any permanent install - soil, seismic and code belong in design.
Sizing a data center thermal energy storage tank follows the cooling energy and temperature difference. Define the profile, use the dT, add loss margin, and the volume follows.
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