Heat engineering; a text book of applied thermodynamics for engineers and students in technical schools . ion of the liquid is 750 Problem 11.—Assume air at 50° F. and move it with a velocity of 1200ft. per minute over the Vento heaters or coils to heat it to 105° F. Howmany sections will it take for the Vento heaters and for the coils? Howmany square feet of each will be required to heat 200,000 cu. ft. of air perhour? Problem 12.—Find the K for a wall composed of 16 in. of brickwork, a2-in. air space and 12 in. of brickwork with 1 in. of cement plaster. CHAPTER IV AIR COMPRESSORS Comp
Heat engineering; a text book of applied thermodynamics for engineers and students in technical schools . ion of the liquid is 750 Problem 11.—Assume air at 50° F. and move it with a velocity of 1200ft. per minute over the Vento heaters or coils to heat it to 105° F. Howmany sections will it take for the Vento heaters and for the coils? Howmany square feet of each will be required to heat 200,000 cu. ft. of air perhour? Problem 12.—Find the K for a wall composed of 16 in. of brickwork, a2-in. air space and 12 in. of brickwork with 1 in. of cement plaster. CHAPTER IV AIR COMPRESSORS Compressed air is used for many purposes for which it wouldbe difficult to employ other media. For operating small tools,rock drills, and hoists and for the transmission of power over con-siderable distance it replaces steam with which the loss due tocondensation is very excessive. The efficiency of transmissionof power by compressed air is not equal to that of electricaltransmission nor is it as flexible, yet in certain cases for somereasons it is of value. For cleaning materials with a sand blast. Fig. 35 -Section of radial blade fanblower. Rotary blower, section. and for use with the cement gun compressed air is force air into a furnace of a boiler or for a blast furnace acompressor of some form is required. Compressed air may beused in air-lift pumps and in direct air pumping. In supplyingair to divers, in the making of liquid air and in the operationof street cars compressed air is required. To compress this air several types of compressors are low pressures up to 10 oz. per square inch above or below theatmosphere, centrifugal or fan blowers, Fig. 35, are used. Inthese, radial or curved blades are driven at a high speed causing a 118 AIR COMPRESSORS 119 flow of air. These are used for ventilation of buildings; for supplyof air to boiler furnaces or cupolas; for forges; for suction in aninduced draft system or for the conveying of light
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