Density of waste cooking oil biodiesel was higher than diesel fuel Calorific

Density of waste cooking oil biodiesel was higher

This preview shows page 45 - 48 out of 51 pages.

waste cooking-oil biodiesel compared to diesel fuel. Density of waste cooking-oil biodiesel was higher than diesel fuel. Calorific value of waste cooking-oil biodiesel is lower than diesel oil. Thermal efficiencies of waste cooking-oil biodiesel blends B10, B20 and B30 achieved decreases about diesel fuel. 3.3 Effect of waste cooking-oil biodiesel blends on exhaust gas temperature Fig. 4 showed the effect of waste cooking-oil biodiesel and its blends
Image of page 45
with diesel oil on exhaust gas temperature at different engine loads. Exhaust gas temperature increases with increase of engine load for all fuels. Thermal efficiency decrease for biodiesel blends about diesel fuel led to increase of heat loss in exhaust gases and increase of fuel consumption. The trend may be due to higher cylinder temperature inside the engine as more fuel is burnt. The heat loss in exhaust gases increased with the increase in engine load. Higher exhaust gas temperatures are recorded for biodiesel blends compared to fossil diesel for the entire engine load. 3.4 Effect of waste cooking-oil biodiesel blends on air-fuel ratio Effect of engine load variation on air-fuel ratios for diesel- biodiesel blends (B10, B20 and B30) is shown in Fig. 5 . Increase of engine load led to an increase of fuel consumption and decrease of air-fuel ratio. Air-fuel ratios for diesel-waste cooking-oil biodie- sel blends were lower than diesel fuel due to increase of fuel consumption with increase percentage of biodiesel in biodiesel blends. Fig. 5. Variation of air-fuel ratio with engine load for waste cooking-oil biodiesel blends 3.5 Effect of waste cooking-oil biodiesel blends on CO 2 emissions Fig. 6 showed the variation of CO 2 emission with engine load for waste cooking-oil biodiesel blends. CO 2 emission is more for bio- diesel and its
Image of page 46
blends than that for diesel fuel. The rising trend of CO 2 emission with engine load was due to the higher fuel entry as the load increased. CO 2 emissions for diesel-biodiesel blends were higher than diesel oil and it is increased with the increase in blend proportion. CO 2 emission increase was due to higher oxy- gen content in biodiesel blends 3.6 Effect of waste cooking-oil biodiesel blends on CO emissions CO emissions variations with engine brake power are shown in Fig. 7 . CO emissions decreased with increasing of engine brake power at lower loads and then increased at higher loads. Decreases in carbon monoxide emission for biodiesel blends were due to more oxygen molecules and lower carbon content in biodiesel blends as compared to diesel fuel which lead to better combustion. The presence of oxygen in waste cooking-oil biodiesel blends is helpful for better combustion and reduction of CO emissions. 3.7 Effect of waste cooking-oil biodiesel blends on NO x emissions Variation of NOx emissions for waste cooking-oil biodiesel blends with respect to engine load are shown in Fig. 8 . NOx emis- sions increased with the increase in engine load for all fuels due to increase of fuel burned and the cylinder temperature which is responsible for thermal (or Zeldovich) NO x formation.
Image of page 47
Image of page 48

You've reached the end of your free preview.

Want to read all 51 pages?

  • Spring '13
  • DAVIS

What students are saying

  • Left Quote Icon

    As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

    Student Picture

    Kiran Temple University Fox School of Business ‘17, Course Hero Intern

  • Left Quote Icon

    I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern

Stuck? We have tutors online 24/7 who can help you get unstuck.
A+ icon
Ask Expert Tutors You can ask You can ask ( soon) You can ask (will expire )
Answers in as fast as 15 minutes
A+ icon
Ask Expert Tutors