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7 Comments
- archimerged, on 10/12/2007, -0/+1Of course, this is the same principle as the Stirling cycle except using isobaric instead of adiabatic means to change the temperature. Stirling engines are never as efficient as the stirling cycle... Discussion welcome on the wiki. Thanks for the digg.
- archimerged, on 10/12/2007, -0/+1The pumped hot water is temporarily lowered below the cold to hot channel because gravity-feed heat pipes carry heat only upward. But the channel is sealed so it works like the Roman aquaduct going under a river -- water flows down the right arm of a U shaped tube and back up the left arm to the same height. In this case, the top of the left arm is an inverted U, a siphon, so the cold water can rise even higher than it was on the hot right side, pushed up by atmospheric pressure entering at the top right (or sucked up by vacuum, which is a less accurate way of looking at it).
- archimerged, on 10/12/2007, -0/+1Top right is open to atmosphere.
Haven't done the cost analysis yet. It will depend on the useful lifetime of the plant, the location, etc. etc. Locations with wider delta T from night to day, and with more direct solar radiation (fewer cloudy days) will produce more compressed air for a given size.
Trompes maintain bubble flow by rapid movement of water. Bubbles can rise in water at a limited rate. If the bulk of the water is moving downward faster, the net bubble movement is downward. Anyway, a trompe has been making compressed air for mines at the Ragged Chutes plant on the Montreal River for almost a century.
http://www.cobalt.ca/ragged_chutes.htm
http://www.motherearthnews.com/library/1977_July_August/Harness_Hydro_Power_with_a_Trompe
See also comment at
http://archimerged.wordpress.com/2006/06/19/trombepump-countercurrent-heat-exchanger-design/
Thanks for the comment. You can edit the text at http://renewableenergy.wikia.com/wiki/TrombePump
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These things could also be build under new highways, with towers every mile or so providing refils for compressed air cars.
Heat enters the water in the bubble pump tower, preferably where the bubbles are expanding so that the water is kept at maximum temperature during expansion. On sunny days, the heat comes from a solar concentrator. On other days and at night it comes from the ambient. Gravity feed heat pipes are used so if it is colder out than the incomming water, the water isn't cooled.
Heat leaves water in the trompe tower, from the downflow pipe, again using heat pipes so heat can%u2019t flow into the water there.
The incomming atmospheric pressure air is used at ambient temperature. This will cool the hot water slightly if it is cold out, but you can't win everything. Or you could arrange for alternate locations for air intake ports depending on the outside temperature. - showmehow2, on 10/12/2007, -0/+0What is the prime output from the "A no-moving-parts isothermal / isobaric cycle heat engine?"
Dry compressed air?
There is a bubble pump for solar heated hot water systems at:
www.bubbleactionpumps.com/bubble_pump_manual/figure_2_bubble_pump_diagram.htm
It is almost free of human intervention except for air removal via a hand operated vacuum pump. - ChiefWizard, on 10/12/2007, -0/+0In an historical trompe, the water falls down the tower from an external elevation system (atmospheric precipitation). In your system, what raises the water from the the heat exchanger channel to fall [back] down the trompe?
- MicrowavedH2o, on 10/12/2007, -0/+0awesome...
Though, I think stirling power is the way to go... - showmehow2, on 10/12/2007, -0/+0How is bubble flow maintained in leftt side downward movement?
Is top right open to atmosphere?
What is the cost analysis of a reasonable installation?
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