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Old 04-02-2009, 04:47 PM   #1 (permalink)
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Hybrid Thermal Efficiency

Hello,

I'm trying to understand how to calculate Thermal efficiency of a car with regular Otto cycle and with Hybrid Parallel system.

I know that Thermal Efficiency = Wout/Qin.

If I have the fuel consumption data, RPM and Torque,
How can I calculate Qin?

As for the hybrid, is it enough to derive that the thermal efficiency in the hybrid system is : (Wout(without electric motor) + P (electric motor)) / Qin

?

I hope you could help me,
Yair.

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Old 04-02-2009, 06:57 PM   #2 (permalink)
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BFSC charts show thermal efficiency

http://ecomodder.com/forum/showthrea...-got-1466.html is a good start
Formula for efficiency from BSFC is Efficiency = 79.3/BSFC (based on petrol energy density of 46.5 mj/kg.)
g/kwhEfficiency
20039.6%
21037.8%
22036.0%
23034.5%
24033.0%
25031.7%
26030.5%
27029.4%
28028.3%
29027.3%
30026.4%
31025.6%
32024.8%
33024.0%
34023.3%
35022.7%
36022.0%
37021.4%
38020.9%
39020.3%
40019.8%
41019.3%
42018.9%
43018.4%
44018.0%
45017.6%
46017.2%
47016.9%
48016.5%
49016.2%
50015.9%
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Old 04-02-2009, 08:09 PM   #3 (permalink)
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just encase you are talking about the prius, it has an Atkinson cycle engine which just means that the expansion volume is greater than the compression. otto cycle is your standard gas engine with the same compression and expansion.

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