_______________________________________________________________________________________ | | | |Compression at |Compression | |a Constant |with | |Temperature. |Increase of | |Mariotte's Law. |Temperature. | __|________________|__________________________________|________________________________ | | | | | | | | | | | | | | | 1|0.1 | | | | | | 20 | 68 |1.0 | | | 68 | | | 2|0.5 | 7199|1468|0.612| 7932|1618| 85.5|186 |1.222| 733|0.092|111 |3.0|23500|22500 3|0.333|11356|2316|0.459|13360|2725|130.4|267 |1.375|2004|0.150|135.5|4.0|37000|35000 4|0.25 |14260|2909|0.374|17737|3618|165.6|330 |1.495|3477|0.196|153.5|4.8|48500|45000 5|0.200|16580|3383|0.320|21209|4326|195.3|384 |1.595|4629|0.213|167 |5.4|58500|52500 6|0.167|18475|3768|0.281|24310|4959|220.5|429 |1.681|5835|0.240|179 |6.0|67000|60000 7|0.143|20038|4087|0.252|27048|5517|243.2|470 |1.758|7040|0.260|190 |6.4|75000|66000 8|0.125|21422|4370|0.229|29518|6021|263.6|506.5|1.828|8096|0.274| | | | 9|0.111| | |0.210| | |282 |539.6|1.891| | | | | | 10|0.100| | |0.195| | |299 |570.2|1.950| | | | | | _______________________________________________________________________________________ | | | | | | | | | | | | | | | 1| 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14| 15 | 16 __|_____|_____|____|_____|_____|____|_____|_____|_____|____|_____|_____|___|_____|_____ Column Heading 1 Tension in Atmospheres. 2 Volume. 3 Work of Compression. Cubic Meters in Kilogram-meters. 4 Work of Compression. Cubic Feet in Foot Pounds. 5 Volume. 6 Work of Compression. (Dry.) Cubic Meters in Kilogram-meters. 7 Work of Compression. (Dry.) Cubic Feet in Foot Pounds. Deduced from 6. 8 Temperatures. (Dry.) Cent. 9 Temperatures. (Dry.) Fah. 10 Ratio of Greater to Less Temperature. Absolute. 11 Loss of Work in Compressing one Cubic Meter in Kilogram-meters. By Increase of Temperature alone. 12 Percentage of Work of Compression Converted into Heat and Lost. By Increase of Temperature alone. 13 Final Temperature if Water is used in Compression. Fah. 14 Percentage of Water to Air Required. 15 Foot Pounds to Compress One Pound Air. Dry. 16 Foot Pounds to Compress One Pound Air. With sufficient Moisture. The first advantage is by far the most important one, and is really the only excuse for water injection in air compressors. We have seen (table 3) that the percentage of work of compression which is converted into heat and loss when no cooling system is used is as follows: