Recently, the CNG utilization in transport vehicles has been one of many measures initiated by the Government of Delhi, to solve growing deterioration of air quality of Delhi due to manifold increase in number of vehicles. In the present study, results of structured questionnaire based survey on Delhi vehicle (car) users has been used to estimate CO2 emissions from petrol and CNG cars. The questionnaire attempts to elicit the several aspects of information e.g. public perception about CNG utilization in vehicles, average daily distance traveled, type of vehicle, fuel consumption, maintenance problem etc.. The results of the analysis indicate that a significant reduction of CO2 can be achieved with CNG cars. It is found that the annual reduction of CO2 emission per car ranged from 73.9 to 923.4 kg. for very conservative to extensive car users. Similarly these figures ranged from 289.5 to 614.1 kg. for small (less than 1000cc) to large cars (1200-1800cc). Considering the total CNG cars (70815) registered in Delhi as on April 2008, the total average load of CO2 emission reduction would be 26159 Metric Tones.
Keywords: Survey of Delhi vehicle (car) users; Petrol and CNG vehicles; Public perception; Emission factors; Annual CO2 estimation.
[...] CONCLUSION It can be concluded from the present study that there is huge potential of mitigation of CO2 emission from CNG Vehicle compared petrol ones. The percentage of CO2 mitigation per year has been found to be It is found that considering the present CNG converted car status in Delhi (70815), the total annual CO2 mitigation is found to be 26159 metric tonnes and this figure would be consistently increasing because of growing numbers of vehicles. REFERENCES Aneja, V.P., Agarwal, A., Roelle, P.A. [...]
[...] Similarly, the study was made for different car users, classified based on the monthly average distance travelled: very conservative users: 200 conservative users:(~ 500 normal users: 1000 extensive users: (~2500 km) Estimation of CO2 Emission from Petrol and CNG Vehicles The knowledge of emission factors of petrol and CNG fuels used in vehicle is necessary to compute CO2 emissions etc for a given value of average distance travelled by the user and fuel consumption of the vehicle. Table 2.1 : Emission Factors for CO2 emission for Petrol and CNG cars (National Inventory Report, 1990-2004, 2008) Type of the fuel Petrol CNG CO2 emission factors (gm/litre) Various studies and experiments have been carried out to estimate emission factors of the various fuels. [...]
[...] In the present study, a modest attempt has been made to asses the CO2 mitigation due to use of CNG vehicles compared to petrol ones METHODOLOGY FOR ESTIMATION OF CO2 EMMISSION 2.1 Formulation of Survey of Delhi vehicles It has been found that as on April total numbers cars running on CNG as fuel in Delhi is 70815 and this number would increase significantly in the near future due to low cost of CNG fuel compared to petrol in addition to being a eco-friendly (clean) fuel. [...]
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