♨️ 1) Heat Duty The first question is always how much energy must be added. For batch heating, this usually comes from the product mass, specific heat, target temperature rise, and any safety/design margin.
🔁 2) Heat Transfer Rate Knowing the total energy is not enough. You must also determine how fast that energy can pass through the heating surface, which depends on U, A, and the effective temperature driving force.
🧪 3) Product Sensitivity Fluids such as milk, sauces, syrups, and pharmaceutical mixtures may be sensitive to burn-on, fouling, shear, or local overheating. This changes the acceptable jacket and agitator selection.
⬇️ Non-Agitated Vessel In a non-agitated tank, heat transfer inside the vessel relies mainly on natural convection. Warm fluid rises near the wall and colder fluid descends elsewhere, but the circulation is weak and uneven. This usually creates a thick thermal boundary layer, low internal film coefficient, slower bulk heating, and greater risk of stratification.
⚙️ Agitated Vessel Adding an agitator changes the regime toward forced convection. Turbulence and circulation reduce the thermal boundary layer thickness, improve wall sweeping, equalize product temperature, and usually increase the overall heat transfer coefficient substantially.
🧱 Conventional Jacket Simple and economical for moderate duties and lower pressures. It is often acceptable for smaller vessels, but for higher pressure service the required wall thickness may become less attractive.
🌀 Half-Pipe Coil Jacket Structurally strong and well suited for higher pressure heating media such as thermal oil systems. The narrower flow path tends to increase service-side velocity and can improve jacket-side heat transfer.
🔷 Dimple Jacket Widely used in food, dairy, and pharmaceutical tanks. It offers excellent pressure resistance relative to weight, good turbulence in the service fluid, and high practical heat-transfer efficiency for sanitary stainless vessels.
📐 Estimated Tank Geometry 10 tons of milk is roughly 9.7–9.8 m³ of product volume. With headspace and process allowance, a practical gross vessel volume may be around 11.5 to 12.5 m³. A common vertical sanitary tank concept might be: Internal diameter: about 2.2 to 2.4 m Straight side height: about 2.4 to 2.8 m Top/bottom heads included as appropriate
🧊 Estimated Jacket Area If the cylindrical shell and part of the bottom are jacketed, a realistic effective heat-transfer area may fall around 18 to 24 m², depending on final geometry, nozzle spacing, support details, and the extent of jacket coverage on the bottom dish/head.
🪛 Recommended Agitator Concepts For milk and similarly low-viscosity dairy liquids, a marine propeller or pitched-blade turbine can provide strong bulk circulation. If wall heat pickup and uniformity are especially important, a slower anchor-type agitator with scraper/wall-following philosophy may also be considered depending on viscosity, cleanability, and process sensitivity.
📊 Estimated Overall U-Value Range For concept-level comparison only: Non-agitated: ~80–180 W/m²·K Propeller-agitated: ~250–500 W/m²·K Anchor / wall-sweeping concept: ~180–380 W/m²·K Exact values depend on viscosity, jacket fluid velocity, fouling, agitation speed, and whether bottom coverage contributes effectively.
Sanitary Process Jacketed Mixing Tanks For milk, beverages, syrups, liquid foods, and sanitary batch heating applications requiring controlled thermal performance and reliable mixing. View Product
Reactor Systems Agitated Process Reactors Suitable for chemical, cosmetic, pharmaceutical, and specialty process duties where heating, cooling, and mixing must work together under controlled conditions. View Product
Utility Package Hot Water & Thermal Utility Skids A practical companion solution for stable jacket heating, especially in hygienic applications where smooth product-side temperature control is critical. View Product