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Refer to the table for selecting the K value of the heat exchanger

2024-12-13View Original

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When choosing a heat exchanger, one often struggles with determining the appropriate value for K. If this value is not chosen correctly, it can result in either an excessively large or too small heat exchange area for the equipment. Here is a table to help with this decision; surely those who find it useful are hoping for such a table. K-value of shell-and-tube heat exchangers: Shell side, Tube side. Range of overall heat transfer coefficients; total fouling thermal resistance included in K. Units: W/(m²·°C), (m²·°C)/W.

Liquid–liquid media:
Diluted asphalt – Water: 57–110, 0.0018
10%–25% ethanolamine (monoethanolamine or diethanolamine) in water, diethanolamine, or monoethanolamine: 800–1100, 0.00054
Demineralized water – Water: 1700–2800, 0.00018
Fuel oil – Water: 85–140, 0.0012
Fuel oil – Oil: 57–85, 0.0014
Gasoline – Water: 340–570, 0.00054
Heavy oil – Heavy oil: 57–230, 0.0007
Hydrogen-rich reformate – Hydrogen-rich reformate: 510–880, 0.00035
Kerosene or gas oil – Water: 140–280, 0.00088
Kerosene or gas oil – Oil: 110–200, 0.00088
Kerosene or jet fuel – Trichloroethylene: 230–280, 0.00026

Jacket water – Water: 1300–1700, 0.00035
Lubricating oil (low viscosity) – Water: 140–280, 0.00035
Lubricating oil (high viscosity) – Water: 230–460, 0.00054
Lubricating oil – Oil: 60–110, 0.0011
Naphtha – Water: 280–400, 0.00088
Naphtha – Oil: 140–200, 0.00088
Organic solvents – Water: 280–850, 0.00054
Organic solvents – Brine: 200–510, 0.00054
Organic solvents – Organic solvents: 110–340, 0.00035
Tall oil derivatives, vegetable oils – Water: 110–280, 0.0007

Water – 10%–30% caustic soda solution: 570–1450, 0.00054
Water – Water: 1100–1420, 0.00054
Wax distillate – Water: 85–140, 0.00088
Wax distillate – Oil: 74–130, 0.00088

Condensing steam–liquid media:
Alcohol vapor – Water: 570–1100, 0.00035
Asphalt (at 232°C) – Therminol vapor: 230–340, 0.0011
Therminol vapor – Tall oil and its derivatives: 340–460, 0.0007
Therminol vapor – Therminol liquid: 460–680, 0.00026
Gasworks tar – Water vapor: 230–280, 0.00097

High-boiling-point hydrocarbons (under vacuum) – Water: 110–280, 0.00054
Low-boiling-point hydrocarbons (at atmospheric pressure) – Water: 460–1100, 0.00054
Hydrocarbon vapors (in condensers) – Oil: 140–230, 0.0007

Condensing steam–liquid media:
Organic vapors – Water: 570–1100, 0.00054
Organic vapors with high non-condensable gas content (at atmospheric pressure) – Water or brine: 110–340, 0.00054
Organic vapors with low non-condensable gas content (under vacuum) – Water or brine: 280–680, 0.00054
Kerosene – Water: 170–340, 0.0007
Kerosene – Oil: 110–170, 0.00088
Naphtha – Water: 280–430, 0.00088
Naphtha – Oil: 110–170, 0.00088

Regulator’s reflux steam – Water: 460–680, 0.00054
Water vapor – Drinking water: 2300–5700, 0.00088
Water vapor – Fuel oil No. 6: 85–140, 0.00097
Water vapor – Fuel oil No. 2: 340–510, 0.00044
Sulfur dioxide – Water: 850–1100, 0.00054
Tall oil derivatives, vegetable oils (vapor) – Water: 110–280, 0.0007
Water – Aromatic vapor azeotropes: 230–460, 0.00088

Gas–liquid media:
Air, N₂, etc. (compressed) – Water or compressed: 230–460, 0.00088
Air, N₂, etc. (at atmospheric pressure) – Water or compressed: 57–280, 0.00088
Water or compressed – Air, N₂, etc. (compressed): 110–230, 0.00088
Water or compressed – Air, N₂, etc. (at atmospheric pressure): 30–110, 0.00088
Water – Hydrogen containing natural gas mixtures: 460–710, 0.00054

Vaporizers:
Anhydrous oxygen – Water vapor condensation: 850–1700, 0.00026
Chlorine – Water vapor condensation: 850–1700, 0.00026
Light oil for heat transfer – Chlorine: 230–340, 0.00026
Propane, butane, etc. – Water vapor condensation: 1100–1700, 0.00026
Water – Water vapor condensation: 1420–2300, 0.00026

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