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parameter | unit | value |
---|---|---|
number of cylinders | 1 | |
engine speed | rpm | 1000 |
bore | mm | 98.4 |
stroke | mm | 101.6 |
connecting rod | mm | 165 |
displacement volume | cm3 | 773 |
compression ratio | 15.5:1 |
property | units | LN2 engine | diesel engine | gasoline engine |
---|---|---|---|---|
IMEP | bar | 4.30 | 4.32 | 4.32 |
inj. fuel mass | g/cycle | 0.61 | 0.024 | 0.024 |
indicated torque | Nm | 26.44 | 26.55 | 26.56 |
indicated power | kW | 1.38 | 1.39 | 1.39 |
effective torque | Nm | 18.32 | 18.44 | 18.44 |
effective power | kW | 0.96 | 0.97 | 0.97 |
engine type | efficiency (%) |
---|---|
LN2 engine | 62 |
diesel engine | 14 |
gasoline engine | 16 |
diesel:
gasoline:
parameter | units | value |
---|---|---|
engine speed | [rpm] | 500 |
cycles | [cycles/min] | 250 |
consumption/C | [g/cycle] | 0.62 |
consumption/M | [g/min] | 0.62 × 250 = 155 |
consumption/H | [g/h] | 155 × 60 = 9300 |
1. | The results revealed that LN2 was fully evaporated and expanded, leading to power generation, and sufficient effective power was achieved by the LN2 engine at certain speeds. | ||||
2. | There was enough pressure created inside the cylinder and the temperature remained near or above ambient in the cylinder at all times. | ||||
3. | The IMEP and effective torque of the LN2 engine also competed with those of fossil fuel (diesel and gasoline) engines at specific engine speeds. However, it decreased at higher engine speeds. | ||||
4. | The indicated efficiency of the cryogenic engine was calculated as considerably high. In this engine concept, there should be very little waste heat in the exhaust. | ||||
5. | The consumption of LN2 (by weight) was considerably higher as compared to fuel consumption in diesel and gasoline engines; however, it was much lower than that of the externally evaporated LN2 engines used in earlier experimental vehicles. | ||||
6. | The overall efficiency for all of the processes including LN2 production and power generation through an internal evaporation engine is 31%. |
https://pubs.acs.org/doi/10.1021/acsomega.1c00582
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