Heat And Thermodynamics
Heat And Thermodynamics
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In our eReader you can find the full English version of the book. Read Heat And Thermodynamics Online - link to read the book on full screen. Our eReader also allows you to upload and read Pdf, Txt, ePub and fb2 books. In the Mini eReder on the page below you can quickly view all pages of the book - Read Book Heat And Thermodynamics
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The thermal effi^Aency of an engine is given by the ratio of the power delivered by the engine to the power due to the heat taken from the source. As an example, assume a steam engine to be taking M pounds of steam per minute from a boiler, the total heat of which, per pound, is H. Let the heat of the water in the condenser be A, which we will assmne is returned to the boiler without losses. Then the heat, expressed in mechan- ical units, which is taken per minute from the boiler, is JM{H-h) ft....-lbs.; and if W represents the number of ft.-lbs. of work delivered per minute by the engine, then the thermal efficiency is W We will now illustrate equation (17) by a numerical example.
Assume an engine making 300 r.p.m., doing work against a friction brake whose arm is 5 ft., and which requires a force of 135 lbs., applied at its end, to prevent rotation. If the engine is consuming 16 pounds of saturated steam per minute, under a pressure of 80 lbs., and returns the water without losses directly to the boiler, from the condenser, where the pressure is 2 lbs., what is the thermal efficiency?
What to read after Heat And Thermodynamics?
You can find similar books in the "Read Also" column, or choose other free books by Francis M Hartmann to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
The thermal effi^Aency of an engine is given by the ratio of the power delivered by the engine to the power due to the heat taken from the source. As an example, assume a steam engine to be taking M pounds of steam per minute from a boiler, the total heat of which, per pound, is H. Let the heat of the water in the condenser be A, which we will assmne is returned to the boiler without losses. Then the heat, expressed in mechan- ical units, which is taken per minute from the boiler, is JM{H-h) ft....-lbs.; and if W represents the number of ft.-lbs. of work delivered per minute by the engine, then the thermal efficiency is W We will now illustrate equation (17) by a numerical example.
Assume an engine making 300 r.p.m., doing work against a friction brake whose arm is 5 ft., and which requires a force of 135 lbs., applied at its end, to prevent rotation. If the engine is consuming 16 pounds of saturated steam per minute, under a pressure of 80 lbs., and returns the water without losses directly to the boiler, from the condenser, where the pressure is 2 lbs., what is the thermal efficiency?
What to read after Heat And Thermodynamics?
You can find similar books in the "Read Also" column, or choose other free books by Francis M Hartmann to read onlineMoreLess
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