Do I need a really cold freezer in my car to use this?.. or is the tank so efficient at insulation, that it can keep the gas at minus 160 degrees?

Cool

As with Electric Vehicles, these devices are only \"emission free\" at the point of use.
Somewhere energy (probably producing emissions) is required to manufacture the liquid air.
7 out of 10 - Must try harder.

7 out of 10 is generous, all we need now is an infrastructure that can supply liquid air all over the world and we are sorted! How excellent is the energy density when you factor in all the energy required to manufacture/transport/store/distribute liquid air? And it is really only a compressed air engine just like the ones in the biscuit factories in Reading 100 years ago. Great idea, but not a solution to anything.

@RJB - was going to ask a similar question - what is the energy cost of the full cycle? And what would be the proposed energy source for the creation of liquid air? I\'d presume though that this could easily be an electrical and renewable source, so I think you are being a bit harsh. My other question is that the graph shows the Dearman Engine to have a lot less energy density than Li-ion, which is not what it says in the text.
(Your comment re EVs ignores the greater efficiency of electric motors over internal combustion, so even if a fossil fuel source is used for the electricity they are still better than petrol/diesel in overall emmissions).

re; Paul Hutchinson
Buy a good thermos and see how long it will keep your coffee hot. same principal.

The early stage we still need current technology to produce liquid air. As it improve, all engine including electric generator could run using this engine. I wonder, will this technology flourishing the common market without the giant petroleum interferent? I doubt.

The terms used in this article seem to reflect commerical understanding only, no understanding for the technical efficiency of things the real concern should be with. It very short sighted to say that cryogenic liquids are produced allready all over the country and then forgetting to mention that this does not make up a distribustion network for customers. \"No range axiety\" is laughable as trust or lack of anxiety comes from the availability and reliability of the distribution network and has nothing to do with the cars energy supply as such. You would have range axiety if there was a petrol station every 1000 miles and your car is said by the manufacturer to be good for 1200 miles, but A) the manufacturer got this number from an artifical stadardized test that he is required to do by law and has nothing to do with reality as such and B) is then slightly polished for marketing purposes. Furthermore tank meter would show the tank to be empty at the 975 miles mark eventhough the tank holds another gallon and you are likely to reach your target as long as the road is not uphill .... the over simplification is mind boggling. - however - I can see that this technology has potential, a few issues though ... where does the heat come from to heat the car in the winter ? what impact have wheather conditions on the engine performance ? what range of liquits can be used ? what temperatures do they need to stay in in order to be liquid ? what happens when the tank takes a hit in an accident and the liquid is spilled ? And finally, what sources for this liquid/s do exsist ? liquid air is certainly an option but best only used when produced by access wind energy systems that have been developed in the UK as well ... Many questions left to answer ... time will tell if the issues can be overcome...

Hmm, so where does the heat exchange fluid get its heat from? Must require a pretty big heat exchanger somewhere else. Anyone done the math on how big and efficient that exchanger needs to be? There is a very large amount of energy required to change air states. How well would this engine run in say, Canada in February/March? And where is the heat coming from to keep the passengers comfortable? Of course air conditioning wouldn\'t be a problem? :) Would also have to make sure absolutely no water got into the engine.

Think about what it is hinting at replacing and you will find out that the cycle environmental costs are a lot less than using batteries and the production and disposal costs that the it entails.
The issue with me is how good will it be in cars and trucks in terms of power (torque) and range (What is a typical car\'s tank hold and how far does it take me vs the albeit limited range of the battery powered alternative.
The bonus is the lack of exotic and rare metals required and the conventional approach.
I am looking forward to reading more about this as I am not sure how good it is yet.
Toe-Knee