analysis of water driven cars

7/30/2019 Analysis of Water Driven Cars

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By Engr. Jamshaid Minhas Page 1

Water As A Last Hope For Future Energy Needs

by Engr. Jamshaid Akhtar Minhas

Water is the most essential element to life on Earth.

Almost 71% of the Earth's surface is covered with water,

approximately 55-80% of our body and 2/3 of universe

is water, without water nothing can exist. The benefits

of water goes far beyond the scope of just drinking

water. I hope to broaden your perspective and open a

window to a new view of water in our lives.

Water at its basic is a chemical substance with one

oxygen and two hydrogen atoms bonded together by a

covalent bond. Water appears in nature in all three

states of matters. Water also exists in a liquid crystal

state near hydrophilic surfaces. Clouds in the sky;

seawater in the oceans; icebergs in the polar oceans;

glaciers and rivers in the mountains; and the liquid in

aquifers in the ground are all different forms of water.

More than half of the world's water supply is contained in just nine countries: the United States,

Canada, Colombia, Brazil, the Democratic Republic of Congo, Russia, India, China and Indonesia.

On 22 July 2011, a report described the discovery of a gigantic cloud of water vapour, containing"140 trillion times more water than all of Earth's oceans combined," around a quasar located 12

billion light years from Earth. According to the researchers, the discovery shows that water has been

prevalent in the universe for nearly its entire existence.

Water is a major source of energy on Earth. Electricity obtained by driving a water turbine connected

with a generator is known as hydroelectricity. It is a low-cost, non-polluting, renewable source of

energy. Water is also used in many industrial processes and machines, such as the steam turbine and

heat exchanger, in addition to its use as a chemical solvent.

On September 8, 1935, the first claim of water fuelled car by Charles H. Garrett was reported in The

Dallas Morning News. The car generated hydrogen by electrolysis as can be seen by examining

Garrett's patent, issued that same year. As several claims of driving cars on water were made since

last century its time to have a serious consideration on this topic that is it possible to run an engine

with water? .

Since water is the main cause of existence of life on Earth its constituents Oxygen and Hydrogen

have the same importance. By mass, oxygen is the third-most abundant element in the universe,

after hydrogen and helium. O2 compound is an important part of the atmosphere, and is necessary

to sustain terrestrial life. Hydrogen gas is highly flammable and will burn in air at a very wide range

of concentrations between 4% and 75% by volume.The enthalpy of combustion for hydrogen is 286

kJ/mol:
http://en.wikipedia.org/wiki/Dallas_Morning_Newshttp://en.wikipedia.org/wiki/Dallas_Morning_Newshttp://en.wikipedia.org/wiki/Dallas_Morning_News


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2 H2(g) + O2(g) 2 H2O(l) + 572 kJ (286 kJ/mol)

Hydrogen gas forms explosive mixtures with air if it is 474% concentrated and with chlorine if it is

595% concentrated. The mixtures spontaneously explode by spark, heat or sunlight. Heat of

Combustion for common fuels is as following Hydrogen 141.9 KJ/g, Gasoline 47KJ/g, Diesel 45 KJ/g

and Ethanol 29.7 KJ/g. Hydrogen is also used to produce the most horrific bombs with its

tremendous power. Hydrogen is a serious consideration for our fuel dilemma. Some people are

worried that hydrogen might be too dangerous. It is true that hydrogen is a very explosive fuel, but

so is natural gas and gasoline.

There are two ways to use hydrogen as fuel to drive our cars. First one is the use offuel cells that

convert chemical energy into electrical energy through a chemical reaction of oxygen and hydrogen

to produce water. A typical fuel cell produces a voltage from 0.6 V to 0.7 V at full rated load. Voltage

decreases as current increases, due to several factors: Activation loss, Ohmic loss and Mass

transport loss. Fuel cells can be combined in series and parallel, where series yields higher voltage

and parallel allows a higher current to be supplied.

(A typical Fuel Cell)

The most popular way is to get hydrogen is electrolysis. The process by which we generate hydrogen

and oxygen from water is called electrolysis. The word "lysis" means to dissolve or break apart, so

the word "electrolysis" literally means to break something apart (in this case water) using electricity.

Electrolysis is very simple - all you have to do is arrange for electricity to pass through some water


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between two electrodes placed in the water. Its as simple as that! The principle of electrolysis was

first formulated by Michael Faraday in 1820.

2 H2O(l) 2 H2(g) + O2(g); E0 = -1.229 V

First law of electrolysis:

In 1832, Michael Faraday reported that the quantity of elements separated by passing an electric

current through a molten or dissolved salt is proportional to the quantity of electric charge passed

through the circuit. This became the basis of the first law of electrolysis:

m = k .q

Second law of electrolysis:

Faraday discovered that when the same amount of electricity is passed through different

electrolytes, the mass of substance liberated/deposited at the electrodes is directly proportional to

their equivalent weights.

As this process consumes large amount of energy the efficiency of this process lies between 50%

and 70%, while maximum theoretical efficiency of electrolysis is between 80% and 94%. The

theoretical maximum considers the total amount of energy absorbed by both the hydrogen and

oxygen. These values refer only to the efficiency of converting electrical energy into hydrogen's

chemical energy. The energy lost in generating the electricity is not included. Dr Daniel G. Nocera a

Professor of MIT is working on a project to improve efficiency of electrolysis with the help of

artificial leafs invented at his lab. His research is mainly inspired by photosynthesis.


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Thus due to the laws of physics energy cannot be created nor be destroyed but can only be

converted from one form to another; also output cannot exceed input in its value because 100%

efficiency is not possible in practical. So electrolysis is not feasible to produce hydrogen in such a

large quantity for combustion to drive an automobile engine. So its impossible to run an automobile

engine on 100% water fuel. Also there are no hydrogen filling stations in your towns so Hybrid Cars

may not get vivid attention at domestic market for at least a decade.

Second way is to use hydrogen as a booster in combustion. Francois Isaac de Rivaz in 1806 designed

the first internal combustion engine, which ran on a hydrogen/oxygen mixture. Paul Dieges patented

in 1970 a modification to internal combustion engines which allowed a gasoline-powered engine to

run on hydrogen. Recently, BMW tested a supercar, powered by a hydrogen ICE (internal

combustion engine), which achieved 187 mph (301 km/h) in tests. At least two of these concepts

have been manufactured.

A hydrogen-boosted engine has much greater fuel combustion efficiency and quality. Invented by

scientists at the Massachusetts Institute of Technology, and being perfected by auto industry

supplier ArvinMeritor in cooperation with the German automotive engineering firm IAV, this system

may provide a cost-effective alternative to fuel-cell technology and traditional gasoline- and diesel-

combustion engines. It uses an add-on device called a reformer to extract a small amount of

hydrogen from gasoline and inject it into the regular fuel-air mixture in the engine's combustion

chamber, this amount of hydrogen can also be produced using electrolysis, it enables almost twice

the volume of air to ignite with a given quantity of fuel than in a regular internal combustion engine.

This promising new technology saves energy by reducing fuel consumption and also burns fuel more

cleanly. A vehicle running on a mixture of hydrogen, gasoline and air can expect to achieve 20 to 30

percent better mileage than one with a traditional engine. The hydrogen-boosted engine runs

cleanly, boosts fuel efficiency and does not require any special equipment for controlling harmful

nitrogen oxide (NOx) emissions.


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(A Typical Diesel Engine)

The combustion of hydrogen with air can also produce oxides of nitrogen. Although it is only

produced in small quantities, research has shown that the oxides of nitrogen are about 310 times

more harmful for greenhouse gas than carbon dioxide, which is the only but most dangerous

disadvantage of this technology.

H2 + O2 + N2 H2O + N2 + NOx

A major cost and environmental advantage of the hydrogen-boosted lean system engine are low

amounts of NOx emissions gasses, hence, complete elimination of the need for external NOx

emissions control. Currently, NOx emissions control is a major cost problem for diesels which use

expensive traps to meet emissions standards. Diesel particulate emissions must also be collected by

a filter that must be periodically regenerated.

Hydrogen-boosted gasoline engines require neither NOx or particulate control filters and require

only a low cost oxidation catalyst to control small amounts of exhaust (unburned hydrocarbons)

formed mostly during engine start-up and early warm up. Additional cuts in emissions control

requirements stem from the engine's ability to use only the clean hydrogen enriched charge during

the cold start phase when 90% of emissions are generated in the emissions test.

It is only the matter of perspective that how far we will go in this field of science in future, its likely

that we'll hear a lot more about the hydrogen-boosted engine in the future. But at present we can

only wash our cars with water instead of fuelling them with it.


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References:

1- http://en.wikipedia.org/wiki/Water

2- http://en.wikipedia.org/wiki/Electrolysis

3- http://www.nmsea.org/Curriculum/7_12/electrolysis/electrolysis.htm

4- http://hyperphysics.phy-astr.gsu.edu/hbase/thermo/electrol.html

5- http://nocera.mit.edu/Home#hn_Research_Group_of_Daniel_G._Nocera

6- http://science.howstuffworks.com/dictionary/biology-terms/photosynthesis-info.htm

7- http://curiosity.discovery.com/question/hydrogen-boosted-engine-more-efficient

8- http://curiosity.discovery.com/question/hydrogen-boosted-gasoline-engine

9- http://auto.howstuffworks.com/fuel-efficiency/vehicles/how-a-hydrogen-boosted-gasoline-

engine-works.htm

10- http://auto.howstuffworks.com/engine.htm

11- http://auto.howstuffworks.com/diesel.htm

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