SUMMARYBefore leaving the question of evaporators let me run over the types and their main features:(1) VacuumPan: A batch unit, chiefly for sweetened condensed milk‐may be used for finishing off very thick concentrate for spray drying; low milk temperature‐expensive on steam.(2) Single‐EffectEvaporators: For continuous work‐low first cost but heavy on steam low milk temperature.(3) DoubleAND Triple‐EffectEvaporators: Economical on steam, and can use low pressure steam, even exhaust steam from turbines, etc.‐elevated milk temperature may limit application.(4) Single‐EffectVapourRecompression: Ideal for high quality products‐no possible overheating‐gives f
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