Hi Jerry et all;.
O.K. lets be talking about the same thing. "The compressed air is
cold", in the process of compressing the air we are sweezing the the
living heat out of it. So you would have heat as a by product
consequently any metel objects becomes a heat sink which is going to be
hot,do not confuse the heat of the pipes to be relitive to the
tempurature of the compressed air inside. The more the air or for that
mater any gas is compressed the colder it gets. When colder compressed
air expands the reverse happens, that being it absorbs heat.=20
Yes the process of compressed air/gas does give off heat but the
air/gas itself becomes colder
>=20
>
> http://www.ingersoll-rand.com/compair/history/cavalc.htm
> "Meanwhile, in 1845, a Doctor Gorrie of New Orleans, La., had developed
> the first practical mechanical refrigeration system to make ice for his
> own professional needs. He compressed air to 15 pounds pressure in one
> cylinder, then conveyed it to another IN WHICH IT EXPANDED and did work=
,
> HENCE BECAME COLD."
Yes you compress air so it is cold, and then run it into a expansion
chamber inside the fridge which absorbs heat, presto ice cubes.
> =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D
>=20
> =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D
> http://www.heatpumpcentre.org/tutorial/industry.htm
> "In open systems, vapour from an industrial process is COMPRESSED to a
> higher pressure and THUS A HIGHER TEMPERATURE, and condensed in the sam=
e
> process GIVING OFF HEAT."
!
> =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D
> http://www.heatpumpcentre.org/tutorial/2_types.htm#compression
> "Vapour from the evaporator is COMPRESSED to a higher pressure AND
> TEMPERATURE. The hot vapour then enters the condenser, where it
> CONDENSES AND GIVES OFF USEFUL HEAT."
Yes compressed vapour will get hot if the heat has no place to go, the
condenser is the heat exchanger it cools the vapour.=20
> =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D
>=20
> =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D
> http://www.stanref.com/res_room/refrg_101/wcc_sizing.html
> "A 15-horsepower compressor in a 15-ton system, produces 225,000 Btu pe=
r
> hour total heat of rejection. That=EDs 3,000 Btu for heat of compressio=
n,
> plus 12,000 Btu of load for each ton."
This is correct,"heat rejection",not hot air
> =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D
>=20
> =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D
>=20
> I guess that's enough to show the rest of the world follows the fact
> that heat compresses, expansion cools.
Yes you are talking about the byproduct reaction not the temp of the
air/gas itself.
>=20
> =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D
> Air powered Street Cars
> "One such instance was the operation of street cars. In the era of
> horse-drawn vehicles cities were faced with difficult transit problems.
> Street railways originally consisted of horse cars and cable cars, in
> that order, but neither one met the needs. The development of electric
> energy was in its infancy. Compressed air, on the other hand, was a
> somewhat familiar and trusted form of power, and its advocates, with
> understandable enthusiasm, sought to apply it to the traction field.
>=20
> The earliest and most successful of these transportation systems
> appeared in Europe, the first one being installed at Nantes, a suburb o=
f
> Paris, by M.L. Mekarski in 1876.
>=20
> The air was compressed to 420 pounds, stored in bottles under each car,
> and fed to piston-type engines at reduced pressure. But just before tha=
t
> was done the air was HEATED TO EXPAND IT so as TO ELIMINATE FREEZING in
> the engines and also to get more work out of it. (FREEZING FROM
> EXPANSION)
This is true, expanding air will absorb any heat from the engine,and
the air will be relitivly warmer.
>=20
> A car would run 7.65 miles on the level before requiring recharging. Tw=
o
> such vehicles were exhibited at the Paris Exposition of 1878. They had
> seventeen seats, standing room for thirteen passengers, and weighed 8
> tons loaded. The trackage was soon afterward extended to Paris and
> attained a length of 58 miles by 1900.
>=20
> Pressures were increased to as much as 1120 pounds, which lessened the
> frequency of charging. Mekarski and Victor Popp were both prominent in
> the Paris project, and in that city the General Omnibus Company built a
> giant housing 7000 horsepower of 3-stage compressors and laid pipes to
> charging stations along the routes.
>=20
> The successes in Paris, Berne, Switzerland, and elsewhere abroad led to
> the promotion of compressed-air traction in this country. Robert Nardie=
,
> who had come to the United States after working for the builders of the
> Scott-Moncrief "air car" in Glasgow, Scotland, was the first inventor i=
n
> the field, and his air engine was tried out on the Second Avenue Railwa=
y
> in New York in 1879.
>=20
> The Hoadley-Knight engine appeared later on, so that there were two
> competing concerns on the ground. These were eventually consolidated
> under the name of Compressed Air Company. Cars were operated in Rome,
> N.Y., and Chicago, Ill., and numerous installations were made in New
> York from 1894 to 1899. One that served for a year on the 125th Street
> Line covered a total of 23,000 miles and carried 137,386 passengers.
> Others ran on 23rd, 24th, 28th, and 29th streets. The importation of
> Mannesmann nickel-steel bottles from Germany permitted storing air at
> 1500 pounds pressure and increased the number of miles from each charge
> to 10 or 12. A 1500-hp., 4-stage compressor was set up to provide the
> high-pressure air. The daily newspapers gave considerable space to
> accounts of these enterprises, as public sentiment was against the
> electric trolley car, which then had many imperfections and was
> hazardous.
>=20
> There were references to "trolley-ridden Brooklyn," and one writer
> stated: "He who extirpates the trolley and gives us something that
> lessens the danger deserves a crown." All this furore over pneumatic
> traction died down quietly when electric cars began to function
> properly. They were not only less expensive but simpler in construction=
,
> for there were 50 mechanical parts in one run by air, as against a moto=
r
> and gear in the trolley.
>=20
> To illustrate how fast things change in this age, we record that,
> although less than half a century has passed since electric cars took
> over, they are now fast giving way to buses. According to a recent
> announcement, there will not be a trolley in New York City within a yea=
r
> or two."
> --
> Jerry Wayne Decker / jdecker@keelynet.com
> http://keelynet.com / "From an Art to a Science"
> Voice : (214) 324-8741 / FAX : (214) 324-3501
> KeelyNet - PO BOX 870716 - Mesquite - Republic of Texas - 75187