Storage heat exchangers must balance stored volume, recovery heat rate, water hardness and pressure rating; wrong volume leads to cold showers or oversized boilers.
Compare YONGFAN U-tube storage units (withdrawable flanged bundle, up to 10 MW) and floating-coil storage units (dynamic self-descaling thermal movement) across 100–15,000 L vessel volumes and pressures up to 2.5 MPa.
Sizing storage from average hourly load drains the tank during 7:00 AM hotel shower peaks, sending cold water to guest rooms.
Hard domestic water builds calcium scale on stationary tube bundles. Floating coils must be specified for dynamic self-descaling.
Poor internal vessel baffling creates stagnant cold zones at the bottom of the vessel, promoting bacterial growth and reducing usable volume.
Specifying standard 1.0 MPa vessels in tall buildings where hydrostatic static head plus booster pressure exceeds 1.0 MPa.
Features a traditional U-tube bundle mounted on a flanged head. The entire tube assembly can be unbolted and withdrawn for direct mechanical inspection, acid washing, or replacement. High thermal capacity up to 10 MW for central institutions.
The floating coil is fixed at one end while the coil body expands and contracts freely with steam/water temperature cycles. This natural flexing cracks off brittle calcium scale before it binds, making it ideal for untreated hard water, solar thermal, and heat pumps.
| Heat Exchanger Area (m²) | Published Capacity (kW) | Steam Consumption (kg/h) | DHW Water Output (L/h) |
|---|---|---|---|
| 0.5 m² | 21 kW | 35 | 360 |
| 1.0 m² | 42 kW | 70 | 720 |
| 2.0 m² | 84 kW | 140 | 1,440 |
| 3.0 m² | 126 kW | 210 | 2,160 |
| 5.0 m² | 209 kW | 350 | 3,600 |
| 8.0 m² | 334 kW | 560 | 5,760 |
| 10.0 m² | 418 kW | 700 | 7,200 |
| 15.0 m² | 627 kW | 1,050 | 10,800 |
| 20.0 m² | 836 kW | 1,400 | 14,400 |
| 25.0 m² | 1,045 kW | 1,750 | 18,000 |
| Heat Exchanger Area (m²) | Published Capacity (kW) | Primary Flow (m³/h) | DHW Water Output (L/h) |
|---|---|---|---|
| 0.5 m² | 10 kW | 0.45 | 170 |
| 1.0 m² | 21 kW | 0.90 | 360 |
| 2.0 m² | 42 kW | 1.80 | 720 |
| 3.0 m² | 63 kW | 2.70 | 1,080 |
| 5.0 m² | 105 kW | 4.50 | 1,800 |
| 8.0 m² | 168 kW | 7.20 | 2,880 |
| 10.0 m² | 210 kW | 9.00 | 3,600 |
| 15.0 m² | 316 kW | 13.50 | 5,400 |
| 20.0 m² | 422 kW | 18.00 | 7,200 |
| 25.0 m² | 528 kW | 22.50 | 9,000 |
Total hot water required during peak hour draw (e.g. 5,000 L in 60 min).
Allowable tank recovery time between draw peaks (e.g. 60–120 minutes).
Steam pressure (MPa) or primary water supply & return temperatures.
Hardness (ppm) to select U-tube vs floating coil; design pressure (1.0/1.6/2.5 MPa).
YONGFAN engineers will calculate tank volume, internal coil surface area, and provide dimensioned submittal drawings.
Every storage vessel shell undergoes 1.25× design pressure hydrostatic verification to guarantee structural integrity.
U-tube and floating coil assemblies receive independent tube-side pressure tests to verify zero cross-circuit leakage.
Stainless steel shells and coils (304/316L/316Ti) undergo internal chemical pickling and passivation for drinking water safety.
Equipped with magnesium or electronic sacrificial anodes to prevent galvanic corrosion on potable water circuits.
Standard documented models cover 200 to 10,000 L; project-specific custom units cover 100 to 15,000 L.
The cantilevered coil expands and contracts with water temperature changes. This thermal movement cracks brittle calcium scale from the tube surface automatically.
Choose U-tube units when plant maintenance protocol prefers unbolting and withdrawing the complete flanged bundle for direct mechanical inspection.
Standard working pressures are 1.0 MPa and 1.6 MPa. High-pressure variants for tall buildings are available up to 2.5 MPa.
Yes. Floating-coil storage units are well suited for low-temperature heat sources such as solar thermal collectors and commercial heat pump loops.
Carbon steel with internal coatings, copper, SUS304, 316, 316L, and titanium-stabilized 316Ti for domestic water hygiene.
Storage tanks are designed for DHW peak draw. For building space heating, select Packaged Units (ZS/ZW).
When hot water demand is steady and continuous, compact Plate Heat Exchangers save plant room space.
High-pressure steam requires an upstream pressure-reducing station to maintain stable 0.2–0.4 MPa coil inlet conditions.
Horizontal U-tube units require horizontal clearance equal to vessel length for tube bundle extraction during maintenance.
Send your peak draw requirements, recovery window, heat source parameters, and water hardness. YONGFAN application engineers will calculate tank volume, internal coil surface, and provide dimensioned submittal drawings.
