Why low pressure steam is used in evaporators?(Steam Economy and steam consumption)

Why low pressure steam is used in evaporators?

For steam (Go through steam tables) as pressure increases Latent heat decreases and specific heat increases. Latent heat can be recovered and where as specific heat cannot be utilized fully. So this leads to increase in steam consumption and decrease in steam economy.

"So for more steam economy low pressure steam is desirable"

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