Steam power plants, their design and construction . Lenglfudinal aaetion of Boilsr Hi. y^ Cr. >tATloii, BosTox, Mam. •• • KllOa* AKO coxtb STEAM POWER PLANTS. 127 If volume alone regardless of pressure is the requisite, thelarger the fan the less the power required. There is a strongtemptation, however, for a purchaser to buy a smaller fan andrun it at a higher speed; for he sees only the first cost and doesnot realize the entailed expenditure for extra power. If possiblea fan should never be made so-small that it is necessary to runit above the required pressure in order to deliver th
Steam power plants, their design and construction . Lenglfudinal aaetion of Boilsr Hi. y^ Cr. >tATloii, BosTox, Mam. •• • KllOa* AKO coxtb STEAM POWER PLANTS. 127 If volume alone regardless of pressure is the requisite, thelarger the fan the less the power required. There is a strongtemptation, however, for a purchaser to buy a smaller fan andrun it at a higher speed; for he sees only the first cost and doesnot realize the entailed expenditure for extra power. If possiblea fan should never be made so-small that it is necessary to runit above the required pressure in order to deliver the necessaryvolume. To double the volume under such circumstances re-quires eight times the power; three times the volume demandstwenty-seven times the power. When a fan is employed for exhausting hot air or gases, thespeed required to maintain a given pressure difference is evidentlygreater than that necessary when cold air is handled, the differ-ence being due to, and inversely proportional to, the absolutetemperature. With forced draft it will be safe to assume that 300 cubic feet
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