[papercreters] Re: Tow Mixer Gas Milage Competition

a little math will show there are more efficient ways to make pulp than pulling it behind a car. however i think the convenience of a tow behind mixer outweighs the gas savings. (dump out into forms instead of lifting heavy pulp)

Gasoline contains about 36600 Wh/US gal.
the 5hp Baldor motor mixer shown in this post:

http://tucson.craigslist.org/tls/3520388633.html

5 hp = 746 watt (1 hp) x 5=   3730 watt to operate for one hour = 3730 wh
with a gasoline engine being approx 35% efficient at best this means i could run this electric 5 hp motor for  3,5 hours on one gallon of fuel.

towing a trailer might add one gallon of fuel to the regular usage of the car. needles to say that the gas driving the car surely outweighs the additional fuel, so unless you would have driven the car anyhow. you are wasting a lot of gas. however like i said i think the convenience outweighs the gas debate any day.
if you are talking about setting up a production line inside a shop as a permanent install. the electric operation will always be less energy consumed.

if we would be debating the emissions it would be a whole other debate.
the 3730 watt needed to operate the electric motor have 78% heat loss at the power plant to add to them. this means it was 16954 watt (raw fuel) needed to produce those 3730 watt electrical.
the watt ratio of electrical power (final fuel) to gasoline (raw fuel) = 1:2
since gasoline otto type engines are 35% efficient at best.


16954 watt (raw fuel) to produce 3730 watt electrical = 3.5hour run time 5hp (el) motor= 59339 watt (raw fuel) to operate 3.5 hours (power plant 22% efficient  with 78% heat losses)

so unless you are operating on a wind mill or a wood gasifier to produce your electrical power to run your mixers.  It is producing more emissions utilizing electrical grid power (coal fired power plants 22% vs 78% waste) than using a regular gasoline engine 35% efficient.
 
I know i went to far with this simple question just thought it might be interesting to somebody lol.



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