The case for CNG
Last week, I focused on electric vehicles in this column and I ended
it with a note on vehicles powered by Compressed Natural Gas (CNG). It
is a cheap fuel to make and use, which is why it is so widespread in
public transport in most countries. Its prices do not fluctuate all that
much, making it ideal for developing countries as well.
Sri Lankans witnessed a LPG craze some time back, which has now
fizzled out mainly because the price disparity between petrol and LPG is
not so vast. However, it gave Sri Lankan motorists a sense of what it is
like to drive an alternative-fuelled car.
But CNG is the new kid on the block and it is time that our
authorities thought of it as an alternative fuel for public transport
and even private vehicles especially with the possibility of sourcing
CNG locally. There are several advantages of having CNG vehicles.
The most obvious advantage of them all is the cost. It is a
comparatively cheap fuel and facilitates high running with lower costs.
On an average CNG costs around half or 1/3rd the amount regular fuel. A
survey conducted in India, where CNG use is widespread, found that a
Hyundai i10 running on CNG and an entry level petrol sports bike such as
the Honda CBR250R have similar fuel costs for an average running of
around 50 kms a day.
It is also a much greener fuel. The emissions and hydrocarbons that
are released as a by-product of CNG usage are lesser than those created
by regular fuel. Carbon monoxide emissions are down by 70-85% while
hydrocarbon levels are reduced by 40-60 percent. Many countries that
care for the environment and that want to reduce air pollution due to
automobiles introduce CNG fuel in a big way.
Fluctuation
The price fluctuation of natural gas is less. Look back over the past
few years. While petrol and diesel prices have been on a roller coaster
ride, CNG has had a relatively linear movement.
Audi A3 Sportback g-tron |
Moreover, contrary to popular belief, CNG is actually a better fuel
for improving engine life as the carbon levels are greatly reduced.
There are a few disadvantages but these can be circumvented if you are
careful. For example, the speed performance of the car is reduced
significantly. On an average CNG users experience a crash of about 10
percent in performance. Acceleration is slower so you may have to rev
the engine more. Drivers expect petrol like performance from CNG and rev
more to get it.
The storage space is affected as CNG tanks are somewhat large. Since
some cars run on both CNG and petrol, two tanks have to be accommodated.
The upside is that the range is much better with two tanks, up to 1,400
Km. Sometimes boot space is reduced or removed entirely as the fuel
storage tank takes up all the room.
Cars with CNG tanks should always be started on petrol and run for a
few kilometres before being switched to the green fuel. This warms up
the engine better and gets the motor well lubricated.
There is another reason why car-makers want to take the CNG route, as
demonstrated by Audi recently with its A3 G-Tron model. Most countries
are having increasingly stringent CO2 emissions regulation, European
car-makers seem to have taken note of the potential that this relatively
green fuel holds.
The Audi A3 g-tron is powered by a 1.4-litre, four cylinder petrol
engine, along with a factory fitted CNG kit. The G-tron switches to
gasoline operation automatically when the CNG levels run low, but the
switch can also be triggered manually.
Audi claims 100 kilometres of driving will consume around 3.5 kgs of
CNG. Courtesy of two CNG tanks the A3 G-tron has manage a real world
range of over 400 kms on the CNG tanks alone. Combine it with the petrol
tank and the range goes up to 1,300 kms. Thus a single fill up a month
should be sufficient for the average driver. Audi altered the
turbocharger, cylinder head, injection system and the catalytic
converter to compensate for the CNG use. Skoda too showed a CNG car at
the Geneva Motor Show.
Developments
CNG developments are coming thick and fast. An energy firm in the US
has just unveiled a new “green house” with a garage ready for your
Electric or CNG-powered vehicle.
KB Home unveiled its first ZeroHouse 2.0 in Los Angeles County, a
house that comes ready for green vehicles with an EV charging station
and a CNG hoockup in the garage.
The company said a “fuel forward” garage with both an EV charger for
electric and hybrid vehicles and a CNG fuelling station for natural gas
powered cars has been integrated into its ZeroHouse 2.0.
The newest ZeroHouse 2.0 is the first KB home designed to achieve
both net-zero energy status, and zero freshwater irrigation use by a
family of four or more, explained the builder. The ZeroHouse is designed
to produce as much energy as it consumes, potentially yielding an
electric bill of zero.
In our region, the best example for CNG use is India, where Delhi and
Mumbai are two major cities that actively encourage CNG powered cars and
of course, public transport including taxis. It is a solution that
greatly reduces environmental pollution.
Our authorities should consider importing a few CNG buses as a trial
run and if it becomes a success, make CNG more widely available
initially for the public transport sector. In the same way that duty
concessions are granted for hybrid vehicles, concessions can be granted
for the import of CNG kits and CNG vehicles.
Worldwide, energy companies and scientists are striving to make
cleaner fuels, including bio-fuels (about which a debate is raging
vis-à-vis the reduction of crops available for human consumption) and
artificial fuels such as the recently unveiled Audi e-gas.
There is some life left in the Internal Combustion Engine and cleaner
fuels will help save the planet, at least until zero emissions systems
such as electric/fuel-cell go mainstream around the world. |