The Ventilation of Coal MinesD. Van Nostrand Company, 1889 - 126 páginas |
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Página 14
... airways in passing round the underground workings . 10. If the whole friction of a mine be measured by 2.18 in . of water gauge , and the final velocity of the air in the upcast is 30 ft . per second - a common enough in feet Motive ...
... airways in passing round the underground workings . 10. If the whole friction of a mine be measured by 2.18 in . of water gauge , and the final velocity of the air in the upcast is 30 ft . per second - a common enough in feet Motive ...
Página 18
... airways in square feet ; h = horse power of ventilation ; k co - efficient of friction ; 7 length of air channel ; o perimeter of air channel ; p = pressure in pounds . per square foot ; q = quantity of air cir- culating in cubic feet ...
... airways in square feet ; h = horse power of ventilation ; k co - efficient of friction ; 7 length of air channel ; o perimeter of air channel ; p = pressure in pounds . per square foot ; q = quantity of air cir- culating in cubic feet ...
Página 25
... air- ways of different areas , other things being equal , is according to the square root of the area multiplied by the area . Thus , the pressure and rubbing surface being the same in each case , the quantity passing in an airway of 30 ...
... air- ways of different areas , other things being equal , is according to the square root of the area multiplied by the area . Thus , the pressure and rubbing surface being the same in each case , the quantity passing in an airway of 30 ...
Página 26
... airways of different lengths of such area as to pass an equal quantity with the same pressure , appor- tion them ... airway by ksv2 ( 26.
... airways of different lengths of such area as to pass an equal quantity with the same pressure , appor- tion them ... airway by ksv2 ( 26.
Página 27
William Fairley. will be found for the first airway by ksv2 ( a ) × q = 17,860 , and the value of α и ks x in each of the other roads is : 2nd , 881.883 , 3rd , 770.400 , 4th , 699.955 , 5th , 649.780 , then : 10000 2.- = 11.339 area ...
William Fairley. will be found for the first airway by ksv2 ( a ) × q = 17,860 , and the value of α и ks x in each of the other roads is : 2nd , 881.883 , 3rd , 770.400 , 4th , 699.955 , 5th , 649.780 , then : 10000 2.- = 11.339 area ...
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Términos y frases comunes
according air passing airways André application blowers calculation carbonic acid circulate cloth coal mines collieries combustion Construction cube root cubic feet cubic foot decimals Degs diagrams diameter difference dimensions downcast Engineers engravings equal splits explosion factor of safety feet of air feet per minute final velocity fire damp Folding Plates formula gases Graphical Statics heated Hypsometry illus inches intake ksv² length mechanical Mechanical ventilation morocco motive column multiplied numerous obtained perimeter plenum system Plympton pounds per square power required Practical Treatise pressure required Prof proportion quantity of air quantity passing relative pressures required to pass resistance result return air return passages revised and enlarged rubbing surface Rules Second edition sectional area specific gravity splitting the air square foot square root Steam-Engine system of ventilation temperature Third edition tion ture typical road unequal splitting upcast shaft ventilating pressure VENTILATION OF COAL water gauge
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