Latent Power Turbines(TM)
A Latent Power Turbine is a heat engine inside a mechanical engine. This combination allows power generators to work in a way that was previously thought to be impossible.
Innovate UK funded our early research at Lancaster University. We have been awarded £98,400 additional Innovate UK/EPSRC funding to test our deigns on a larger scale.
Based on earlier research at Lancaster University we are building a new type of power generator. Our aim is to make a breakthrough in the fight against climate change by generating green energy at a price that drives fossil fuels out of the market.
Our breakthrough is
For hundreds of years people in hot climates have been keeping their houses cool by using hollow ventilation bricks that force the wind to move faster as it passes through them. Speeding the air up also cools it, sucking heat out of the houses.
We have gone one stage further. By placing a "canned wind turbine" inside a constriction, a combined power generating and air cooling system is produced. We then close the loop by using a length of pipe and add a fan to keep the air moving.
In engineering terms what we have
done is build a heat engine inside a mechanical engine. This combination
allows us to convert thermal energy into electricy with 100% efficiency
without violating the laws of thermodynamics.
And as a bonus, in hot climates, Latent Power Turbines also provide free air conditioning.
Patent application Nos. GB1418029.3 GB 0807276.1, 0618171.3, 0903879.5
The intellectual breakthrough behind LP Turbine design is so radical we will need to start off with a few notes about thermodynamics.
Please stick with us even if you hated physics at school. With your help we might just be able to crack the climate change problem.
How you can help
(i) Spread the news. Until the idea that green energy can also be cheap goes viral, many people will oppose the fight against climate change because they think it will cost them money.
(ii) We are a small company and need the help of big players. If you have a business interest please get in touch with us.
This is a photograph of our partly built Mark One engine.
Ourcounter-intuitive design in a nutshell
Yes, this is the physics bit!
How an electricity generating engine can be 100% thermally efficient without violating the laws of thermodynamics
The trick is to build a heat engine inside a mechanical engine.
The mechanical engine is filled with air at approximately atmospheric pressure and temperature. There are no other chemicals involved.
The heat engine has to obey the Carnot
efficiency equation just like any other engine. This means that it is
thermally very inefficient but the external
mechanical engine sneaks round the efficiency problem.
(i) It captures the rejected heat stored in the air that exits the heat engine,
(ii) Adds some new heat so that the working air is restored to its original condition.
(iii) Injects the rejuvenated air back into the heat engine.
(iv) It keeps on doing this indefinitely.
(v) The "business part" of the mechanical engine operates at a temperature lower than its environment. Consequently it cannot lose heat without violating the first law of thermodynamics.
During a single transit the heat engine offers a pathetically low efficiency, as demanded by the Carnot equation. But because no heat is wasted, in practical terms LP Turbines are 100% thermally efficient.
They cannot be less than 100% thermally efficient without violating the first law of thermodynamics.
The operation of the electrical components and the work done against friction all generate low grade heat but this does not equate to a net heat loss because any heat leaking into the environment from externally mounted components can be drawn back into the engine again.
The following diagram summarises the key features of our Mark One Latent Power Turbine.
The interior of an LP Turbine is always cooler than its environment. This means that in principle an LP Turbine could continue to generate electricity until the circulating air started to liquify. (Yes, when we get some additional funding we will try to do this!)
However, in damp climates such as in the UK, icing up is likely to start causing problems at a few degrees above freezing.
Here is an annotated photograph of the throttling section of our Mark One engine.
Well, that's the physics out of the way. So what can we do with LP Turbines?
A problem solver
Solar powered LP Turbines would allow all EU countries to meet their electricity demands in summer. But Mediterranean
Greece, Italy, Spain, Portugal and Cyprus could produce additional electricity for splitting water into hydrogen and oxygen.
The hydrogen would be used to fuel LP Turbines in winter. And, in liquefied form. be used as pollutant free transport fuel.
- No more industrial smog to harm our kids and asthma sufferers.
Here is one of our glasshouse designs for harnessing solar energy at a lower unit cost than using solar panels.
Figure 1 A cross section through a glass house as used in warm Southern European countries.
By adding air ducts and using the waste heat to drive LP Turbines clean low cost energy could be generated.
A problem solver for the Middle East?
The Arab Spring was triggered by one man’s despair at not being allowed the dignity of honest work.
Latent Power Turbines could stimulate low carbon wealth, energy and food production in
Afghanistan, Iran, Israel and a future Palestinian state.
On the rest of this web page we will concentrate on some applications for Latent Power Turbines
Summary of applications
efficiency of fossil fuel power stations.
Reducing the cost of
carbon capture processes.
Converting low grade
industrial waste heat into electricity.
Industries as diverse as steel manufacturing and potato crisp production would benefit.
efficiency of solar thermal power stations.
efficiency of geothermal power stations.
Manufacturing transport fuel without
Air conditioning large
buildings while producing power instead of consuming it.
temperature and humidity in underground railway tunnels.
away from the grid in warm climates.
production and water desalination units.
Glass house plant
propagation in arid climates.
energy from sea water to drive LP Turbines in winter.
Delivering a hydrogen economy.
1 Improving the efficiency of fossil fuel power stations.
Figure 2. The steam turbines used in fossil and nuclear power stations are not very efficient.
A typical coal fired power station can only exploit about 40-50%% of the energy fed into the turbine.
The remaining energy is trapped as latent heat in the “cool” turbine exhaust steam.
In this illustration the cooling towers at Ferrybridge power station are dumping the waste heat into the atmosphere.
(Original photograph courtesy of SSE.)
Figure 3. Steam turbines dump a lot of waste heat into the environment. The very pure water required for turbine operation is re-circulated, but the secondary cooling water used to condense the steam at the end of the turbine cycle is gradually lost to the environment. This loss can be a serious problem during prolonged draughts.
The alternative to cooling towers
Latent Power Turbines could be powered by the waste heat we currently throw away.
This diagram shows how we could do it.
4. The principle of an LP Turbine
based steam condensing unit. A large array of such units would be
The air passing through the turbines is dry at one atmosphere pressure. The steam condensing on the outside of the turbine tube is below atmospheric pressure.
Figure 5. LP Turbines can be used to increase power output and reduce fuel costs.
The need for secondary cooling water is also eliminated.
2 Carbon capture
Fossil fuel power stations will only become truly “green” if the carbon dioxide they produce can be captured and buried. The snag with existing techniques for carbon capture is that they are very energy intensive and are predicted to increase energy costs by about 25%. In Appendix 2 of our technical page we explain how LP Turbines could convert carbon capture into a net energy generating process.
3 The petrochemical industry
The business model could completely change, with oil being phased out in the manufacturing of fuel and fertilisers.
3.1 Petrol and diesel would be replaced by liquefied hydrogen as the fuel of choice.
Figure 6. Hydrogen could replace petrol and diesel as the motorists
favorite fuel. But the costs of manufacturing and liquefying hydrogen
would have to tumble to make it price competitive.
LP Turbines have the potential for reducing the costs of manufacturing and storing liquid hydrogen.
Power generating bonus: Power stations specialising in the production of liquid hydrogen would do so off-peak, feeding power into the grid when peak demand was high, for example, during a cold winter. This would ensure security of supply for electricity consumers without the high cost of keeping spare capacity on standby.
Image acknowledgement http://www.startrescue.co.uk/blog/what-is-the-future-of-hydrogen-cars#.VD00wOl0xD8
3.2 Aviation fuel
Manufacturing hydrogen by splitting water into hydrogen and oxygen would also produce copious amounts of oxygen. The carbon dioxide released by burning waste materials and other forms of bio fuel in pure oxygen could be captured and used in the production of synthetic kerosene, with LP turbines providing the necessary energy input.
3.3 Nitrogen fertilizers
The bulk of the worlds nitrogen fertilizer manufacturing industries use the Haber process to convert methane gas into into nitric acid, the key ingredient in manufacturing nitrogen fertilizers.
Birkeland–Eyde process dispenses with the need for methane, using
nitrogen extracted from the air instead.
Until now the Birkeland–Eyde process has been uneconomic because it consumes a large amount of electricity converting the nitrogen into nitric acid, with most of the electricity ending up as low grade heat.
This would not be a problem for an LP Turbine based system, because the waste heat could be converted back into electricity again.
4 Micro and local power generation
4.1 Hot climates
The design shown in Figure 4 would be useful in environments where there is also a demand for moist air cooling.
Combined micro-power and solar desalination plants are a feasible option. Solar radiation would be used to evaporate water vapour from brine and an LP Turbine would act as the heat sink for vapour condensation.
4.2 Cool climates
In most parts of the world, rock temperature only increases by 25oC for every kilometer increase in depth. This hopelessly inadequate for conventional geothermal power stations, but quite sufficient for LP Turbines. Consequently countries such as the UK that have very limited areas of hot underground rocks could still become major geothermal power generating nations.
5 Large scale solar thermal power stations
Figure 1 is reproduced below.
extraction ducts can be added to existing glass houses. When coupled to LP
Turbines this converts them into solar power stations.
The power generated depends on location, time of day, cloud cover etc. In southern Europe we estimate this will averages out at about 500 kWh/m2.
This is higher than the power output for photo-voltaic cells and a lot cheaper.
5.1 Extract heat from a warmer layer of the atmosphere
At night the ground temperature in warm arid regions falls rapidly. But a warmer layer of air, 100 metres or so above ground level is common. This can be tapped into using a tall chimney.
Figure 8. The "chimney" works in reverse, drawing down relatively warm air at night.
A large fan is required to pull the air through the turbine hall.
Each kW-hour of power generated will also condense out about 1.5 liters of water.
Increasing glass house productivity
Some of the electricity can be used for night time illumination of the glass houses. This will increase crop yields.
5.2 Combined solar thermal and gas fuelled power stations
Natural gas would be burned to produce additional heat when the solar power is inadequate.
The combustion process produces water vapour and carbon dioxide. Consequently, LP Turbines will be inherently more efficient than conventional gas turbines because they can harness the latent heat released when the water vapour condenses. The carbon dioxide would be fed back into the glass houses to speed up the rate of plant growth.
Combined solar and gas fuelled power stations would be a good option for Southern European countries because they could operate at full power throughout the year.
Rice growing paddy fields produce methane which is a potent greenhouse gas. This climate change threat could be converted into a virtue by growing rice inside the LPT glass houses and using the methane rich air as the air supply for natural gas combustion. (Methane is the principle component of natural gas., so gas purchase prices would be reduced slightly.)
5.3 Combined solar thermal and bio fuel
The bulk of the bio fuel could be grown inside the glass houses. A dedicated double glazed glass house would be assigned for drying out the fuel. The moist air produced by drying the fuel would be used to power LP Turbines.
5.4 Combined solar and geothermal
The efficiency of geothermal power stations can be improved by replacing conventional steam turbines with LP Turbines. Combining solar and geothermal LPT systems offers a further advantage: the geothermal rock can be “rested” during daylight hours, allowing it to warm up again.
5.5 Extraction of latent heat of fusion
Dry air LP Turbines can operate below 0oC.
Latent heat could be extracted from brine as pure water freezes out to form ice. If brackish or sea water is available locally, the system would also deliver freeze desalinated drinking water.
Figure 9. Ice is frozen out at night, releasing latent heat to power the LP Turbines.
6 Using LP Turbines to create tourism and engineering jobs in Southern Europe
LP Turbines could deliver power and water to coastal communities. As a bonus, floating warm moist air generators, used to supply energy to the LP Turbines could act as pontoon harbours.
Figure 10. A pontoon version of the solar powered LPT power station would provide moorings for boats. It would produce 1.5 litres of drinking water for every kW-hour of electricity generated.
A bonus for Greece
To save on transportation costs, pontoons for use in the Mediterranean basin would need to be built locally.
Designing and building the pontoons could revive the Greek shipping industry.
Figure 11. Greece, Italy, Cyprus, Portugal and Spain could become the green energy generating sunshine economies of Europe.
7 LP Turbines could make the deserts bloom
(Map courtesy of Guinness Publishing.)
Fig. 12. The World’s
In addition to the true deserts shown, all the populated continents have extensive tracts of semi-arid scrublands. These could become economically productive regions if solar LP Turbine systems were introduced.
Estimating the desert area needed to be colonised by solar LP Turbine units to meet our TOTAL energy needs
(i) The mean annual direct solar energy density for the Sahara desert is 2.9 x 103 kWh/m2. For comparison, this is about twice the solar energy density in southern Italy. 
(ii) For the following desert calculations we will assume a cautious value of 1.0 x 103 kWh/m2/year. (=109 kWh/km2/year). We will also ignore any energy captured from the desert air at night.
Sample primary energy consumers (Primary energy = coal + oil + gas + nuclear + renewable)
Total primary energy consumption/yr (x1012 kW h)
Area of solar LPTs required to generate equivalent amount of energy (km2)
Regional desert(s) used for comparison
Total area of desert(s) (kn2)
% of desert area required to meet all energy needs
2.4 x 103
26.6 x 103
North American (Mojave + Sonoran)
Whole world 
142.3 x 103
All of Worlds true deserts
15 013 x 103
 Desert areas, The Guinness World Data Book, ISBN 0-85112960.9
 Italian National Agency for New Technologies, Energy and the Environment, 2005, "Harnessing solar energy as high temperature heat".
 IEA Key energy statistics 2010
(i) These calculations are presented simply to show that generating all of the worlds energy needs using desert solar energy is possible. We are are not proposing that this should be done.
For example, in hot weather, Iran could meet a large fraction of its energy needs by using LP Turbines to simultaneously cool its buildings and generate electricity. In winter, the same LP Turbines could run off shallow geothermal energy. The Iranians have a long and proud history of using clever engineering to keep their buildings cool and their arid lands irrigated. We hope that they will become early adaptors of LP Turbine technology/
(ii) Don't forget, these power generating glass houses also produce cash crops and create jobs in the horticulture industry.
8 How to make
replanting the rain forests profitable
– without subsidy or handouts!
Daytime rain forest temperatures are lower than in deserts at the same latitude, but the air remains warm and humid throughout the night. This will allow LP Turbine power stations based in rain forests to operate 24/7 without any form of backup heating.
Figure 13. This is a plan view of a replanted rain forest based LPT power station. (Not to be confused with a Dalek on a bad hair day!)
Replanted rain forests can earn extra money by acting as carbon sequestration sites. The following vertical cross section through an LPT moist air conduit and adjacent land shows how.
The archaeological evidence suggests that biochar can remain locked in
rain forest soil for more than a millennium. Rain forests growing on
improved soil have a lower canopy and denser undergrowth. This should
improve the moist air holding capacity of the forest. [“Hand made”, New
Scientist, P42, 4 June, 2011.]
The soil inside the tunnels will will be protected from physical erosion by violent tropical rainstorms.
During El Nino events the Indonesian rain forests are subject to drought and catastrophic fires. Enriching the soil with biochar and adding fire breaks will improve the fire resistance of the replanted forests.
9 Supplying LP Turbines with heat in cool climates
9.1 Extracting heat from sea water
The average sea water temperature around the British Isles in winter is
about 6oC. This combined with the fact that sea water freezes
at about -2oC, suggests that Britain could employ offshore LP
Turbine units to generate power all year round.
Figure 15. Pontoons floating offshore could become the homes for large LP Turbine power stations. The same design could adapted to provide power for marine vessels and buoys.
Strategically placed pontoons could also provide a degree of storm protection for vulnerable stretches of coastline such as at Dawlish, UK where a length of exposed railway track was swept away in February 2014. As a tourist bonus, the pontoons could be linked to the shore by a gangway, with the pontoon roofs being used as a create a promenade.
9.2 Community power stations
To reduce electricity transmission costs it makes sense to build power stations as close to the consumer as possible. Here is a suggested design for a community power station that people might want to have close to their homes. It would provide a large airy, pleasantly warm indoor space where people of all ages could spend their leisure time. It would create a refuge during heat waves and encourage lonely people out of their homes in the harshest of winters.
Figure 16. An LP Turbine power station could improve the quality of life for the whole community. Normal body temperature is 37oC, several degrees higher than the air temperature required to run LP Turbines. Even people chilling out by the pool would be donating body heat for the manufacturing of electricity.
Community power stations may even create a new social animal, the YIMBY. (Yes in my back yard.)
10 Reducing air temperature and humidity in underground railway tunnels
Figure 17. Heat trapped in underground tunnels could be converted into electricity.
11 Converting fracking wells into geothermal power sources
Fracked gas is warm and rich in water and organic vapours. LP Turbines could be used to cool the raw gas and strip out the vapours. Scrubbing the gas in this way would generate additional power without increasing greenhouse gases.
When the wells are exhausted they could be enjoy an extended life as geothermal heat reservoirs.
Cold dry air could be pumped into the wells and warm moist air for driving LP Turbines extracted. Heat of compression would be removed from the dry air before injection and also used for driving LP Turbines.
In mild weather the LP Turbines would extract heat from the atmosphere, leaving the underground heat reservoirs to make a thermal recovery.
Optionally, the electricity could be used for splitting water into hydrogen and oxygen. The existing natural gas distribution network would then be used for distributing the hydrogen to customers.
12 How low can they go?
If LP Turbines are used for extracting thermal energy from atmospheric air, then the outer surfaces of the turbine unit will start to ice up when the air temperature falls to around 5oC.
SLIPS ice repelling coatings being developed at Harvard University may solve this problem.
If it works efficiently, SLIPS would allow countries with damp cool climates, such as the UK, to generate all of their electricity using outdoor LP Turbines, all year round.
Preferably, the power stations would be situated in community forests so that the additional chilling of winter air did not raise objections from the neighs.
Figure 18. The steep jacket walls would encourage any ice that did form to drop off under gravity. The air inside the jacket would be dried by running the LP Turbine for several minutes at about 5oC, so that the water vapour fraction of the air condensed out.
SLIPS technology may also be useful for reducing drag inside LP Turbine systems. This would allow the air to travel through the turbines at higher speeds, increasing their power to volume ratio.
13 Nuclear waste incinerators
14 Current state of development (October 2014)
The concept of a power generator that can sneak round the limitations of the Carnot equation is so radical that we need to build something getting close to it, to get people talking about the idea.
We will be satisfied if our current LP Turbine generates sufficient power to brew a decent cup of tea.
It is being built for us by C-Tec Innovation at Capenhurst near Chester, UK.
Journalists, academics, politicians and people with a serious business
interest are welcome to inspect the generator and ask us questions.
This project is supported by Innovate UK and the
Engineering and Physical Science Research Council.
Barriers to progress
(i) The project leader and inventor, Bill Courtney suffers from macular degeneration. He can only read documents two letters at a time and is unable to do any experimental work. Bill is the first to admit that he needs to be replaced by a team from a company with specialist engineering skills.
(ii) For the proof of concept research we
are keeping costs down by using a small marine propeller as the rotor
and a fork lift truck motor in reverse as the generator. The
blades clearly have the wrong shape with air deflected off one blade
bouncing off the back of the succeeding blade. We need to find a partner
who can build a bespoke turbine-generator unit, hopefully with the aid
of further funding. A similar comment applies to the fan design.
We are using a centrifugal fan that delivers a distorted air flow
because such fans are readily available. A pair of axial flow fans
would eliminate the need for a long air smoothing tube.
A similar comment applies to the fan design. We are using a centrifugal fan that delivers a distorted air flow because such fans are readily available. A pair of axial flow fans would eliminate the need for a long air smoothing tube.
Figure 19. In addition to optimising the turbine and fan designs, the drag as the air moves round the rounds needs to be minimised.
One way of doing this is to string together several LP Turbines in the form of a daisy chain.
Figure 20. A daisy chain of LP Turbines.
Latent Power Turbines are almost too versatile. They could destabilise world energy markets if there is no international long term plan for their implementation. Energy policy planners are invited to contact us to discuss the issues.
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