Engines And Boilers
Engines And Boilers
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Supplied per hour per horsepower is 778X1011. 2X30. 35. Therefore, since the efficiency is the out-put divided by the in-put, This is based on the i. Hp. The dry steam used per hour per b. Hp. Is 2970/89. 7 = 33. 1 pounds; hence the thermal efficiency based on the b. Hp. Is 33000X60 778X1011. 2X33. 1 In this solution the factor 33000X60/778=2545 will always occur in the equation for thermal efficiency. Hence the formula may be written in the form 4i i a 2545 thermal efficiency = - . P . , ,, --... - - > nX B. T. U. Per pound of dry steam where n is the number of pounds of dry steam used per hour per horsepower.
The thermal efficiency of a steam engine will seldom, if ever, exceed 25 per cent. This may seem to be a very low value, but it is impossible for the engine to use a very large part of the heat supplied due to the fact that the exhaust steam carries with it its heat of vaporization. On account of condensation of steam in the cylinder and other causes of heat loss, the efficiency of a reciprocating engine seldom approaches the efficiency of an ideally perfect engine working under the same range of pressure, but a well-designed steam turbine of large size may do so.
What to read after Engines And Boilers?
You can find similar books in the "Read Also" column, or choose other free books by Thomas Taylor Eyre to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
Supplied per hour per horsepower is 778X1011. 2X30. 35. Therefore, since the efficiency is the out-put divided by the in-put, This is based on the i. Hp. The dry steam used per hour per b. Hp. Is 2970/89. 7 = 33. 1 pounds; hence the thermal efficiency based on the b. Hp. Is 33000X60 778X1011. 2X33. 1 In this solution the factor 33000X60/778=2545 will always occur in the equation for thermal efficiency. Hence the formula may be written in the form 4i i a 2545 thermal efficiency = - . P . , ,, --... - - > nX B. T. U. Per pound of dry steam where n is the number of pounds of dry steam used per hour per horsepower.
The thermal efficiency of a steam engine will seldom, if ever, exceed 25 per cent. This may seem to be a very low value, but it is impossible for the engine to use a very large part of the heat supplied due to the fact that the exhaust steam carries with it its heat of vaporization. On account of condensation of steam in the cylinder and other causes of heat loss, the efficiency of a reciprocating engine seldom approaches the efficiency of an ideally perfect engine working under the same range of pressure, but a well-designed steam turbine of large size may do so.
What to read after Engines And Boilers?
You can find similar books in the "Read Also" column, or choose other free books by Thomas Taylor Eyre to read onlineMoreLess
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