With a Few Design Features for a Trompe

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In summary, the conversation is about the plan to build a trompe in rural Nepal to generate electricity. The participants discuss the potential output of a pneumatic motor, the type of alternator needed, and the challenges of regulating and distributing the energy produced. They also consider the possibility of using a low-flow turbine system instead of a compressed air system. The primary engineering consideration is the availability of enough water flow and height to supply the necessary power output.
  • #1
Trompe
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Hi Everybody

The plan is to build a trompe in rural Nepal.

Has anybody here built one?

Sure would love to hear from you.

I believe we could generate enough psi to run a pneumatic motor that puts out 8.4 hp possibly more but i would like to start there and see what sort of output we could expect from an 8.4 hp motor.

I'm struggling with some electrical questions, one being what alternator could produce the most energy from that 8.4 hp

I have searched but can't find what I'm looking for, mostly because i don't really know what I'm looking for and specs on ones i found, when present, don't make much sense to me.

We obviously want the maximum AC output possible.

Another question is what happens after the alternator?

What do i need to stabilize and distribute what was being produced?

Any other aspects of the electricity side of this you could chime in on with suggestions that would be great.

Thank You

Trompe
 
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  • #2
What an interesting idea.
The tromp is basically an air compressor and works directly on mechanical energy. I have a feeling that the overall efficiency may not be as good as you would get with a commercially designed hydroelectric alternator and a motor. You see, there are two energy transfers in your system (tromp and pneumatic motor) rather than just the one (turbine). Even if there were nothing fundamental to this, the fact that many more have been designed and built would probably make it a better proposition. (You could probably get one off the shelf).
Nevertheless - as an interesting project, the Trompe beats my suggestion any day. It would all depend on your motives.

Regulation would be along the lines of existing hydro systems, I imagine.
 
  • #3
Hi Sophiecentaur

You're right about it essentially being hydro electricity but the turbine will possibly need much more flow of water than a trompe, to be honest i don't really know as finding a functioning trompe is not an easy task which also leads me to believe i might be on a fools errand. But at the same time i really want to give this a go, i guess you could say i want to believe.

In this application we don't have a huge volume of water flow that is why i want to try with the trompe design.

It will be an interesting experiment indeed.

Just wish i had more knowledge on the subject as i said not much on the internet other than basic information and, I've yet to find one that actually creates electricity. Seen a few pulsar pumps that work, same principle only the energy is used to pump the water to a higher elevation, something that could also come in handy in Nepal.

Any help would be greatly appreciated.

Thank You

Trompe
 
  • #4
Trompe said:
Hi Everybody

The plan is to build a trompe in rural Nepal.

Has anybody here built one?

Sure would love to hear from you.

I believe we could generate enough psi to run a pneumatic motor that puts out 8.4 hp possibly more but i would like to start there and see what sort of output we could expect from an 8.4 hp motor.

I'm struggling with some electrical questions, one being what alternator could produce the most energy from that 8.4 hp

I have searched but can't find what I'm looking for, mostly because i don't really know what I'm looking for and specs on ones i found, when present, don't make much sense to me.

We obviously want the maximum AC output possible.

Another question is what happens after the alternator?

What do i need to stabilize and distribute what was being produced?

Any other aspects of the electricity side of this you could chime in on with suggestions that would be great.

Thank You

Trompe

Is your goal to store energy in the form of compressed air, or to generate electricity from the flow of water?

http://en.wikipedia.org/wiki/Trompe

If the flow of water doesn't vary much, I'd stay with a low-flow turbine system. If the flow of water varies a lot over each day or week, then a compressed air system of energy storage may be practical.
 
  • #5
Trompe said:
Hi Sophiecentaur

You're right about it essentially being hydro electricity but the turbine will possibly need much more flow of water than a trompe, to be honest i don't really know as finding a functioning trompe is not an easy task which also leads me to believe i might be on a fools errand. But at the same time i really want to give this a go, i guess you could say i want to believe.

In this application we don't have a huge volume of water flow that is why i want to try with the trompe design.

It will be an interesting experiment indeed.

Just wish i had more knowledge on the subject as i said not much on the internet other than basic information and, I've yet to find one that actually creates electricity. Seen a few pulsar pumps that work, same principle only the energy is used to pump the water to a higher elevation, something that could also come in handy in Nepal.

Any help would be greatly appreciated.

Thank You

Trompe
Start with the primary engineering consideration:
You first need to find whether there is enough flow and height to supply 8kW of continuous power output (with lists to spare to cope with an efficiency of, 80% (a reasonable figure for a small hydroelectric system). That means you need about 10kW of raw power from the flowing water. There are many combinations of height and flow rate but examples would be:

100m height and 1l of water per second (I think that flow rate would involve much lower efficiency)
10m and 10l per second
Power in Watts = hmg Height in metres X flow rate in kg per second X g
You need to check that you have that sort of supply capacity. It's not a vast amount and hydro power is surprisingly good value - if you have the free water in the first place.

How is it looking so far?
 
  • #6
A trompe is a great way of generating compressed air, but only if you have a continuous flow of water and sufficient head. The advantage of a trompe comes from it's mechanical simplicity. Unfortunately only a small part of the energy of the falling water is available in the compressed air.

The compressed air does not have to be used at the base of the trompe. It can be returned to the head, or anywhere nearby, without significant loss of air pressure.

The amount of air entrained as bubbles in the water flow decides the density of the water column. More air injected will therefore reduce the pressure at the air receiver. The flow velocity must be greater than the rate of bubble rise. If you do not already have access to both ends of a drill hole with a significant height difference, the cost of materials will be determined by the diameter and wall thickness required for the trompe pipeline.

The air receiver at the bottom of the trompe must remain at high pressure. This requires that a restriction be provided to regulate the flow and maintain the water pressure by limiting the escape of water from the bottom. The potential energy of the falling water appears across that restriction, through which the total flow of water passes. So if you want to generate significant energy, replace that restriction with a turbine. Milk off the compressed air for use in applications where air is needed such as for pneumatic tools and ventilation in mining. Use or sell the power generated from the turbine. Funny how things happen. There is an artesian water well in the top of a 30 metre hill nearby. Last week I was trying to work out how I could operate three trompes in series on the same hill to generate 100 psi for pneumatic tools and air cooling. That might generate compressed air whenever the well was permitted to flow. The problem is that the air flow needs to be in series while the water flow is in parallel. I see no way to achieve that simply, it needs pressure independent flow equalisers to operate in a steady state.

There is a conceptual parallel here with Marx Impulse Generators, where capacitors are charged in parallel, then erected in series to produce the high voltage, which lead me back to the simple flyback diode. If I operate a hydraulic ram pump at the bottom of the hill, then it could impulsively increase the air pressure available from one single trompe pipeline. The hydraulic ram valve acts, (cyclically), as the trompe restriction. But more problems arise. The compressibility of the water column due to the entrained air reduces the pressure peak available. The air bubbles become slightly smaller so the water may become more “solid” as it approaches the ram valve. Unfortunately, a hydraulic ram prefers a bubble free water column in a non-elastic feed pipe, especially on final approach to the valve. A hydraulic ram already has an air chamber that acts as a capacitor in a low pass filter to push water slowly but continuously up the output line. The output line is not needed with the “trompe - hydraulic ram” chimera, but some form of water pressure release valve is needed.

My investigation continues.
 
  • #7
A trompe is great if you have loads of energy to spare but the energy transfer cannot be efficient because you can't design the bubbles as you can design a water turbine.
Low maintenance though.
 
  • #8
Thanks Sophiecentaur

Forgive me but i don't get all of that equation

Power in Watts = hmg Height in metres X flow rate in kg per second X g

what is the g factor?

Unfortunately I'm not on the property now and have never been so i don't yet know how much water we are dealing with, I've been told it's a small stream and we have 100 m of head.

Maybe like berkeman pointed out a traditional turbine could be more effective i will also look into this.

I will be in Nepal in april staying for 5 months maybe more if i can sort out a visa. So i have time to figure out a plan and put it into action.

So far the idea is to run the head down the side of the mountain and the return water going back up the hill to a lower elevation than the water/air intake in order to maintain flow. The difference in elevation between the intake and exit point will determine flow rate and the amount of psi i can create will be determined by a formula such as the one Sophiecentaur provided.

Power in Watts = hmg Height in metres X flow rate in kg per second X g

I'm curious if those numbers would change if the head isn't vertical, if slope would change the pressure?

i found this chart, attached below that shows schedual 40 8" pvc will give me 950gpm i converted that to 126 cfm the reason i did that is the other chart for motor specs shows i would need about 187 cfm to run a motor that would give me 4.4 hp max output.

with an 8" pipe i planned on trying to add a 3" air intake that would roughly move 47 cfm of air, a 4.4 hp motor would need about 187 cfm

i would need 4 8" pipes with 3' air intakes to get 4.4 hp.

or maybe not as the original flow was calculated at 0 gravity but if i had 100 meters of head the flow would increase, not sure how much Sophiecentaur's formula might help to figure that out, but it looks like a max of 2,800 gpm in an 8" pipe according to that chart i posted, but other charts suggest different amounts this was the chart with the more conservative results.

If we could get a flow of 2,800 gpm thru the 8" pipe with a 3" pipe of air intake that would = about 140 cfm so somewhere between 47 & 140 cfm of air seems possible from an 8" water head with 3" air intake.

So now I'm thinking 4.4 hp motor might be more a realistic target, powered by maybe 2 8" feeds with an undetermined head but hopefully less than 100 meters.

Anybody know how much juice one could expect from a 4.4 hp motor?

As I've stated before I've had no luck finding specs for alternators i only find things that are too big or a car alternator. Can anybody point me in the right direction to find the alternator I'm looking for to generate AC on this scale?

Baluncore i would love to hear what you decide on and how it goes, it sounds like we are trying to accomplish the same thing.

Thanks again you guys have been great.

InJoy The Journey

Trompe
 
  • #9
g is acceleration due to gravity.

Ignoring efficiencies...
4.4 HP = 4.4 * 746 watt = 3.3 kW
3.3 kW @ 230VAC = 14.3 amp
 
  • #10
In theory, it is the height difference, not the slope, that decides the pressure and energy availability for power generation.

But when a pipe is used as a trompe, the entrained bubbles are rising against the flow. If the pipeline is not vertical the bubbles will soon rise to the upper surface and merge into one long bubble. The bigger the bubble the faster it rises so you get a flow of water down the bottom side of the pipe and a reverse flow of air on the upper side, which will destroy the trompe effect. So for maximum efficiency the trompe must have a vertical shaft to prevent the air bubbles coalescing.

There may be a compromise. If you insert very small bubbles from many pores at the top of a vertical tube, they will be compressed in the first say 10 metre vertical section. They then rise more slowly because they are compressed smaller and they may be able to tolerate a diagonal pipe section ending in the air receiver. I would stick to a vertical pipe for my early experiments.

The best trompe situation would be a vertical drill hole into a gently up sloping adit below, where the air is needed and the water can flow out of the hillside.
 
  • #11
Thank You Balucore

I'm actually surprised at how much power 4.4 hp will generate which has me even more eager to build a working model.

I'm even more surprised more people aren't using a Trompe? Is that another warning sign I'm on a fools errand?

The idea was to have air inlets coming from about 20 1/8" lines not just one 3" pipe, this way we could also easily add or subtract air input to find the optimal volume.

The problem the slope creates is cause for concern thanks for bringing that to my attention. Can anybody chime in on how much head would be needed to maintain 100 psi using an 8" pipe.

Would it be true, if taking into account that roughly 40% of the volume will be air on the intake my inlet should be about 40% higher than the outlet?

Thanks Again

InJoy The Journey
 
  • #12
The pressure is dependent on air and water flow rate. If only a small amount of air is needed then each 10 metres will give you 14.5 psi. That requires a 70 metre = 225 ft head.
If you want as much air as possible then you will need more height to compensate for the bigger bubbles at the top reducing the density of the water.

It may be possible to compensate for a sloping trompe pipe by having an inner fixed spiral vane. That would cause the water to spiral down the pipe. Done right the bubbles would average out and not all end up on the upper wall. If you spin the water too fast all the bubbles will move to the centre, so maybe one turn every couple of metres could work in an 8” pipe.

Trompe said:
Would it be true, if taking into account that roughly 40% of the volume will be air on the intake my inlet should be about 40% higher than the outlet?
I don't understand how the input could be 40% higher than the outlet.

Only the air near the injection point will have about 40% by volume. The bubbles will rapidly become less by volume as the pressure increases. For that reason the trompe inlet should be a trumpet shape with air injection close to the top where the hydrostatic pressure is least and the air can be drawn in by Bernoulli without additional technology. For economy, the wall thickness will need to increase down the pipe as pressure increases.
 
  • #13
@trompe

I am still concerned about some of your basic assumptions here. It is one matter to do calculations which assume a certain pipe dimension but the thing that counts is how much actual water flow is available at the top. Are we dealing with a lake or a small, conveniently placed, stream? Where does the water go at the moment?

Your lack of the fundamentals is also of concern because it would be a shame if you were to spend a lot of money and effort on a project that has no possibility of working. For instance, you mention a 4.4hp motor. This would be a pneumatic motor, I assume. Where does this figure actually come from? You say you can't find suitable Alternators - so where are you finding a range of pneumatic motors (a very much smaller market)? I have seen alternators on alternative energy sites, which are suitable for domestic applications (feed in tariff etc.)
Warning: There are plenty of suppliers of equipment who will be only too pleased to sell you something that is totally unsuitable for your purpose; you need to be fully confident about feasibility before spending what will amount to several thousand Pounds Stirling.
Baluncore has made some interesting suggestions but I think they are angled at someone practical, like him. Have you the knowledge and facillites to experiment and develop this on the hoof? It bothers me that you didn't know what "g" stands for. It suggests that you haven't even looked at the Wiki article on Hydroelectricity. For any hope of success in this, you will need to become a mini expert. This is one reason why I am convinced that the hydroelectric solution is the one for you. There is so much more equipment and experience available and you could probably buy equipment for an off the shelf system.
I am sorry. This may seem very negative and not at all what you want to read but your situation is not that unusual and the Trompe has not been used in more than a few (if any) projects like yours. There will be a reason for this (A good Engineering reason) and your level of expertise is clearly not high enough for you to supply the technical knowhow to drive such a project through to success.
Engineering is just as much a matter of avoiding potential failure as completing successful projects.
 
  • #14
Thanks Sophiecentaur & Baluncore

You both are bringing up good and valid concerns that i am definitely taking into consideration.

Sophiecentaur you are correct when you say i don't have the background or knowledge to pull this off but I'm not alone, we do have an electrical engineer who will be helping. This is a guy who has made his own charging system with a bicycle and he made his own permanent magnent alternator by fitting magnets and coiling copper wire into an old ceiling fan, that charges a 12volt battery, he powers his bungalow led lights and a laptop with a 20 min stationary bike ride each day. He has built his own solar panels as well so we do have other options. He is a clever guy and has loads of ideas. I may not have the necessary knowledge but i will learn what i can and get help where needed.

I love challenges and have done many different things in my life like buying a 110 year old house that hadn't been lived in for over 50 years. I had never mixed a bag of cement, tiled anything, plastered walls (do you know how hard it is to plaster when you've never even seen it done?) or built kitchen cabinets from scratch but i did it all on my own with only the help of 2 other workers to help with structural construction for 6 weeks. Completion took me 3 years mostly coz i had no money and banks had already loaned a large sum but it was the housing crisis in Spain so getting more was not possible but i plugged on as i do.

In the end i made much more money than i thought i would when i started the project because i did the work as well if not better than "professionals" would have done. That may sound cocky but the mason that helped with structural stuff was amazed at what i did and how well i did it even built a fire place, they are tricky but i did it. Called the mason to help with the fireplace but i had actually finished it and wanted to show him, like i said he was impressed. A local plaster guy gave me a few tips over beers but his final tip was when you realize you can't do it just give me a call and i will do the job, for a fee of course. I called him he came with his tools but the job was done and he couldn't believe i had no cracks it was done properly after 8 years it still all looks good. Opting to build cabinets, windows, doors from scratch instead of buying prefab crap was also a huge plus to the finish product. The only thing i had was self taught basic carpentry skills the rest i learned on the job i plumed the house with just the information on what size pipes to use and what the grade had to be for the sewage. A professional told me what size wires breakers and such i ran all the cables, to be honest i could have finished the job but he wanted to connect everything to be sure and then he signed off on the electric and plumbing. I see this new project as just another challenge, a much bigger one and new skills but that does not scare me, neither does failure, but i will try.

We may very well decide not to build a trompe but we want to at least research it, and yes the fact that i can't find a working model on the web is of concern, yet how cool would it be to put up some youtube videos of our success and show people that it can be done, if you have the right amount of water and head on your property. There is a mine in Canada that has a large one with just over 100 meters of head they run demanding pneumatic tools and also supply fresh air to the miners. We won't have 100 meters of vertical head but if my theory is right about the sloped head we could have 100 meters of head. This should generate enough constant air pressure to generate enough power to run a 4.4 hp motor.

About the air bubbles not working on a slope i was thinking that it could be possible to have the 1/8" air lines actually go just short of the separation tank. The flow of water will suck the air in and it won't have much time to rise in the way Baluncore described. Maybe I'm wrong I'm in Thailand now and have no tools or materials to work with so i can't really play around with a model just yet but I'm just getting together a plan and trying to learn what i can so I'm ready to dig in when i get there in April.

The 40% figure i came up with was because the feed will have roughly 40% less water that the outlet that has no air, that airless water will be heavier than the the feed so less distance will be needed to create the same pressure. Since the feed will be roughly 40% air i thought that was a good place to start. Maybe my theory is wrong but it does seem to make sense, if anybody can point out what is wrong with that line of thought I'm all ears.

On the pneumatic motors i attached a screen shot of a chart that has specs for a variety of motors.
They also have larger ones but it seems like a 4.4 hp one would be a good one to shoot for.

My friend will probably build the permanent magnet alternator from scratch but if i can find something off the shelf it would be nice to know we have another option.

Again you guys have been great i really appreciate the help.

InJoy The Journey

J
 

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  • #15
It's good that you have someone practical to help you here. There are the other issues that still need to be addressed. What is the available water flow from your reservoir? You have not said, yet and it is a make or break figure. You need a minimum of what I calculated in my other post. If you insist that the tromp is the solution then I have no idea how efficient the energy transfer from hydraulic to pneumatic energy is likely to be. As it is inherently very turbulent and you don't seem to have design knowledge, you could be aiming at something very low - like 20% or less (?). Whatever the efficiency, it will be far from the value of a well designed water turbine and will have serious repercussions on your possible supply power. A hydro system will not be affected much by any slope.

All this is fine if you just want a fun project. If you really want to power your house electrics from it then the sums have to be right. For instance, the power of those motors is quoted at 6.3 Bar. That is Six Atmospheres, which is the equivalent of 60m of static water pressure. Hopefully, your friend will help you sort out things like that but it certainly can't be ignored. Also, do those motors work with saturated air with actual water droplets in it? That could be what the pressurised air from your tromp is probably like. Those pneumatic motors are surely for specialised use with a source of clean air from a compressor.

I have to ask you again- why do you think that alternative power schemes all seem to use hydroelectric generation? There are a lot of very experienced Engineering* types who are involved in alternative energy. Do you know of any examples of a tromp being used for your type of project? The fresh air for that mine seems a very good application of the 'free energy'. What tools do they use and at what power? The details really do matter.
If I were you, I wouldn't choose to do it this way on the grounds that you could impress some people on YouTube (the YouTube audience can be impressed by a dancing dog - more possible hits there, in fact!). It would be a big stake for not much return.

*The definition of and Engineer is someone who can do, for £5, what any idiot can do for £50. Talk to (employ) an Engineer before embarking on this.
 
  • #16
There are a couple of engineering principles here:
1. It is better to couple power through a solid, than a liquid, than a gas. Boats are more efficient when powered by propellers in the water, not the air. Cars are propelled by wheels on the road rather than propellers in the air.
2. Every energy conversion involves loss. Why generate pneumatic energy unnecessarily, if you then need to convert it again. Compressed air is quite unnecessary in this electrical power generation situation.

At the bottom of your trompe there must be a restriction to maintain hydrostatic pressure in the water. Without that restriction the air pressure will be very much lower. The vast majority of the energy available from the drop is available at that restriction where it takes the form of mass flow rate multiplied by the pressure difference. That is where you should put your turbine.

My guess is that you cannot get 5% of the available energy from a trompe as air pressure. You could easily get 85% from a water turbine at the restriction. The cost of the pipeline would be significantly less when using a hydraulic turbine, rather than a pneumatic turbine.
 
  • #17
Baluncore said:
There are a couple of engineering principles here:
1. It is better to couple power through a solid, than a liquid, than a gas. Boats are more efficient when powered by propellers in the water, not the air. Cars are propelled by wheels on the road rather than propellers in the air.
2. Every energy conversion involves loss. Why generate pneumatic energy unnecessarily, if you then need to convert it again. Compressed air is quite unnecessary in this electrical power generation situation.

At the bottom of your trompe there must be a restriction to maintain hydrostatic pressure in the water. Without that restriction the air pressure will be very much lower. The vast majority of the energy available from the drop is available at that restriction where it takes the form of mass flow rate multiplied by the pressure difference. That is where you should put your turbine.

My guess is that you cannot get 5% of the available energy from a trompe as air pressure. You could easily get 85% from a water turbine at the restriction. The cost of the pipeline would be significantly less when using a hydraulic turbine, rather than a pneumatic turbine.
Trompe I am on the same path, for creating Alternative Energy. I would love to speak with you, kindly reply.
 
  • #18
Trompe said:
Hi Everybody

Thinking about how to combine an Atmospheric Water Generator with a Trompe and Nitinol (and/or a Tesla Turbine)
An atmospheric water generator needs solar panels or a power source to run the air compressors. It extracts water vapor from the atmosphere, condenses it, filters it and purifies it with UV light (245 nm) and/ or ionizing or ozonating water.
The industrial AWGs are loud because of the air compressors. And the compressed system of the AWG is adiabatic.

A trompe isothermically compresses air. So when you use it, the air is Extremely cold.
A trompe requires a source of running water.
So if you use a trompe to power an industrial sized Atmospheric Water Generator, you solve the noise issue, can get rid of the adiabatic air compressors altogether, get rid of the solar panel, and the unit wouldn't ever get hot. Might have to have a heater actually to warm up the water since the compressed air from the trompe running the AWG might freeze the water.
And you also might not need a natural source of water! Can use the water collected by the AWG to power the trompe.

You could then combine either a Tesla Turbine or Nitinol Heat engine in the set up.
Bubble the isothermically compressed air through a vat of water. It will keep the water very close to freezing. Then have an electric generator run by the compressed air which powers a heater. Then you have 2 vats of water. 1 cold, 1 heated. Put the Nitinol Heat engine in the varying temperature water and vwalla.
Or, use the compressed air to power a tesla turbine. Then you have a sustaining energy source from a trompe, AWG and Nitinol.

I'd need one hell of a kickstarter campaign. lol

Ecolo Blue Industrial AWGs:
http://store.ecoloblue-world.com/en/11-industrial-commercial

Trompe:


Nitinol:


Would need to know a bit of math.
How much water would be required to flow into the shaft of the trompe to produce the needed bubbles in the reservoir?
And what size industrial AWG would provide the water necessary?

So take a place like San Diego where I live. There's a major drought in California. With this set up near the reservoir, you could silently pump water into the reservoir daily without need for solar panels or any power from a grid regardless if it's raining or not.
 
  • #19
I am confused where conservation laws come into the nitonal thing. That video can't seem to make up it's mind whether we are talking about an 'energy source' or an energy converter. Many words but very few figures - which are needed before anything is a serious Engineering proposition.
For answers to your questions regarding the troupe, you would have to specify just how much water is dropping down this column. and how high it actually is. You will not get more power out than the gravitational potential times the mass flow per second will allow - minus the various losses. (More conservation laws, here, too)
Don't consider investing any money in such a project until you have done the sums.
 
  • #20
When I see references to a Tesla Turbine or a Nitinol Engine, I know that economy and power are not being seriously considered. A trompe is likewise, a way of generating compressed air while wasting huge volumes of water. If a waterfall is handy then by all means use it to produce compressed air if compressed air is what you really need. But considering using a trompe in a desert is a really poor engineering solution.

Maybe it is time to define the engineering problem that needs to be solved.
 
  • #21
since this is a small rivulet wouldn't paddle-wheels geared to individual generators produce more power from the flow? run all the water through a tube with several paddle wheels within use direct force instead of pneumatic
 
  • #22
Baluncore said:
Maybe it is time to define the engineering problem that needs to be solved.
You mean like a 'real Engineer' would? But that would take the magic out of using alternative stuff and indicate that a tried and tested method would almost certainly be the best. 20 million flies (accountants) can't be wrong.
 
  • #23
I'm doing some research myself on trompe designs and am finding very little information. I was wondering if you were successful in creating energy from a trompe? Do you think it is worth pursuing.
 
  • #24
Welcome to PF.
A trompe is a great way to generate compressed air if you have excess falling water and need compressed air. A trompe is not a good way to economically extract energy from falling water, it is better to use a water turbine and alternator as in a traditional hydro-electric plant.

Posts #6 and #7 on page 1 analysed the situation.
 
  • #25
Man you engineers are so jaded, trompes take very little resources to build unlike hydroelectric setups, how is water wasted if it is still coming out of the end of the system.
 
  • #26
Jungle science said:
how is water wasted if it is still coming out of the end of the system.
Welcome to PF. Water is not being “wasted”. It is the potential energy of the water that is being wasted.

Energy in engineering is directly equivalent to money.Why waste energy of money by not using the most efficient engine.
Compressed air is less efficient than liquid hydraulics, which is in turn less efficient than electrical power.
 
  • #27
Jungle science said:
Man you engineers are so jaded,
"jaded" or careful? What use is water that is right at the bottom of a hill? No one can get at it to use, without pumping it uphill again - which would take a lot more energy than the trompe produced from it.
Engineers try to look at the bigger picture and efficiency is the middle name of any good Engineer. It's a shame that more politicians are not Engineers by trade.
 
  • #28
If the water is at the bottom of a hill you could just bury the trompe next to that body of water if you are needing to use that to pump water up hill a water hammer or pulsar pump could be used in conjunction with the system.

The trompe may be slow , but it is also cheap and simple with no moving parts in the standard design, with very little maintenance, easy to work on without disrupting natural water ways and all water used is returned to the source or can be used for other purposes such as pressuriZed off the grid water source, a trompe can be done on a very small scale or units can be setup in tandem for a stacked effect.

A trompe can also be used for refrigeration and airconditioning.

At one point before the current petroleum era some major cities had compressed air running infrastructure such as public transport, culinary equipment,light and heavy heavy machines and refrigeration.

If a water pump is needed in any case these can be run by a very small solar setup with backup battery for the night.

I think the tech deserves a little more credit than it is being given.
 
  • #29
Jungle science said:
I think the tech deserves a little more credit than it is being given.
I don't think you need to defend the basic idea or the OP. He asked for serious opinions and not blind enthusiasm.
The devil is in the detail. A "solar setup" is an alternative energy input which would be better employed as an electrical source - it has not been included in the conversation up till now and is not part of the equation (just remember the word 'efficiency' applies throughout this thread). If water is needed, higher up the hill, then you would get far better value by diverting it at that height it is needed (efficiency, again); a water hammer uses vast amounts of water to pump a very little.
Also, the history of power distribution through cities is hardly relevant to the discussion here. Efficiency was sometimes very poor in historical installations; it often didn't matter and an inefficient installation was a lot better than no installation.
A lot of people submit Alternative ideas on PF for using energy sources and there is a lot of experience and knowledge available from some members. The responses are often a bit disparaging. A really worth while project can be justified against any "Negative" comments and one should take them in the spirit they are intended. It's one thing to say a project is interesting but the acid test would be to decide whether or not you would invest $1000 of your own money. In fact, in general, if you re-run any arguments about proposed Engineering projects and replace the word 'Energy" with "money", it can help with seeing things realistically.
 
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1. What is a trompe and what are its design features?

A trompe, also known as a trompe l'oeil, is a style of painting or design that creates the illusion of three-dimensional space on a two-dimensional surface. The design features typically include realistic shading, perspective, and attention to detail.

2. How does a trompe work to create an illusion?

A trompe uses various techniques such as shading, overlapping, and foreshortening to create the illusion of depth and dimension on a flat surface. These techniques trick the viewer's eye into perceiving a realistic three-dimensional image.

3. Can a trompe be used in interior design?

Yes, a trompe can be used in interior design to create the illusion of a larger space or to add depth and interest to a room. It can be applied to walls, ceilings, or other surfaces to create a realistic and visually appealing effect.

4. What are some examples of famous trompe designs?

There are many famous examples of trompe designs, including the ceiling of the Sistine Chapel painted by Michelangelo, the frescoes of the Villa Farnesina by Raphael, and the works of Dutch painter Johannes Vermeer. Additionally, trompe designs can be found in modern art, architecture, and advertising.

5. How can I incorporate a trompe into my own design project?

You can incorporate a trompe into your design project by first studying the techniques and elements of trompe design. Then, choose a surface or space to apply the design and consider the desired effect and perspective. Finally, use your skills and creativity to create a realistic and visually engaging trompe design.

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