GIFSQ Tools · Module 07 — Dairy, Milk, Cheese & Fermented Products · Tool 134 of 500
Work out how much whey powder a batch of liquid whey gives at a target powder moisture, and how much water must be removed.
Try sample values — fills the form with the worked example below.
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Whey powder (kg)
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Solids (kg)
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Water to remove (kg)
Equation: Solids (kg) = whey (kg) × total solids (%) ÷ 100. Powder (kg) = solids (kg) ÷ (1 − powder moisture (%) ÷ 100). Water to remove (kg) = whey (kg) − powder (kg).
Method: Whey drying mass balance; total solids by ISO 6731 (IDF 21) and powder moisture by ISO 5537 (IDF 26, drying). Whey powder is usually dried to 3–5% moisture.
Assumptions: all solids in the whey stay in the powder; no solids are lost in the dryer or cyclone; the powder moisture is uniform.
Limitations: the balance gives a theoretical yield — real dryers lose a little powder to the exhaust and to wall deposits, and the powder moisture varies with the dryer settings.
Rounding: masses to 2 decimal places; intermediates unrounded.
This is a calculation aid, not a laboratory report — confirm against your accredited method before citing a value.
Method: Whey drying mass balance; total solids by ISO 6731 (IDF 21) and powder moisture by ISO 5537 (IDF 26, drying). Whey powder is usually dried to 3–5% moisture.
Assumptions: all solids in the whey stay in the powder; no solids are lost in the dryer or cyclone; the powder moisture is uniform.
Limitations: the balance gives a theoretical yield — real dryers lose a little powder to the exhaust and to wall deposits, and the powder moisture varies with the dryer settings.
Rounding: masses to 2 decimal places; intermediates unrounded.
This is a calculation aid, not a laboratory report — confirm against your accredited method before citing a value.
Worked example: 1000 kg of whey at 6.5% total solids, powder at 4% moisture. Solids = 65.00 kg; powder = 65 ÷ 0.96 = 67.71 kg; water to remove = 1000 − 67.71 = 932.29 kg.
Enter values above to see results.
Liquid whey is about 6–7% total solids; whey powder is usually 3–5% moisture, so roughly 93% of the whey mass is water to remove. Tool 134 of 500 — GIFSQ
