Fig. 8. ‘‘Maps’’ of indicated efficiency, shown by contour lines of
iso-efficiency (with green indicating higher efficiency numbers,
while red stands for lower numbers). The indicated efficiency is the
ratio of work delivered to the piston to the fuel energy input.
The actual engine efficiency will be lower because of friction losses.
However, wewant to demonstrate the qualitative differences between
ambient temperature (‘‘warm,’’ top figure) hydrogen injection and
cryogenic injection (bottom figure). The maps show the operational
range of an engine, by plotting indicated mean effective pressure
(IMEP), a measure of the engine load, against engine speed.
Note howthe peak efficiencies are the same for bothconcepts, but that
the peak efficiency can be obtained in a larger region of themap in the
case of cryogenic injection. Also note the higher peak loads that are
achievable with cryogenic injection (higher IMEPs).
Fig. 8. ‘‘Maps’’ of indicated efficiency, shown by contour lines of
iso-efficiency (with green indicating higher efficiency numbers,
while red stands for lower numbers). The indicated efficiency is the
ratio of work delivered to the piston to the fuel energy input.
The actual engine efficiency will be lower because of friction losses.
However, wewant to demonstrate the qualitative differences between
ambient temperature (‘‘warm,’’ top figure) hydrogen injection and
cryogenic injection (bottom figure). The maps show the operational
range of an engine, by plotting indicated mean effective pressure
(IMEP), a measure of the engine load, against engine speed.
Note howthe peak efficiencies are the same for bothconcepts, but that
the peak efficiency can be obtained in a larger region of themap in the
case of cryogenic injection. Also note the higher peak loads that are
achievable with cryogenic injection (higher IMEPs).
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