Can anyone help me with this calculation?
I have a KIA Sorento 2010 model, it is a great car 4WD SVU.
It has the following:-
1. Weight 1884 Kg Dry (fuel tank 70 ltrs)
2. Six Speed Auto Trans
3. 2.2 litre intercooled turbo Diesel, Output 145Kw at 3800 rpm, 436Nm @ 1800-2500 RPM
City driving towing a trailer with a golf cart about half the time and with air conditioner on occasions, It consumes 11.5 litres of diesel per 100 klm.
The question is, Diesel motor is more efficient than a petrol motor, and an Electric motor is more efficient than a Diesel motor.
So What is the calculation to find out under my driving conditions(11.5 ltr per 100 klm), if I convert to electric, how many Kwh of electricity would I use per 100 klm.
i.e.( 11 Litres of diesel for a the above diesel motor) (How many Kwh for an electric motor Substitute)
Thanks
Guiness-4-U
Kwh required to replace existing Diesel engine in SUV
Sat, 04/02/2011 - 22:21
#1
Kwh required to replace existing Diesel engine in SUV
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Support V is for Voltage
The torque says something about the acceleration at low motor speeds.
But as soon when the motor is running at higher speeds,the power , the 145kW kicks in.
So, if you look at these two on a schematic, torque curve is in front of power output curve, not total in front, they overlap for a certain range.
Electric motors works a bit different. They go to full power at start and, they have a higher efficiency compared to the diesel.
So a way could be: divide 145*0,45 = around 65,25kW
Yes, the effeciency of a diesel is higher then a gasoline engine , but still under 50%
A electric motors are more a problem: their effeciency may be between 78 to 93% so your first concern is to choose a motor with higher effeciency. Lucjy for you, effeciency and max power are related.
Let's assume 90% : 65.25/0,9 = 72,5kW
So, you sure need 72,5kW electrical compared to the 145kW diesel.
Batteries : the most important factor is the power (Ah) that a battery can give to a motor.
And not forget, controllers stop if the voltage drops below a certain limit.
Starters : motor voltage = battery voltage must fit.
W/V gives the Ah
But there is not soo much to say cause there are various battery models with their own discharge capacity and maximum discharge capacity
Note: the motor controller has also no 100% effeciency so there is some extra loss between battery and motor. Even the used cabling leads to power loss.
About the fuell:
Is included in the power loss percentage of the motor.
Thers is indeed some power loss when burning diesel but it's the engine that looses most power.
And the turbo: works only good at higher engine speeds, the turbo is included in the overall effeciency.
Side note: eff. rates for a direct injection are a bit higher, approx. 60 to 63%
Side note 2: if you use wheel motors then you gain some power.