A diesel engine receives air at 300K and 100 kPa, and as liquid biodiesel fuel (sunflower oil) at the same temperature. The air-fuel ratio is 30 to 1, and the compression ratio is 15. The lower calorific value of sunflower oil is 34.14 MJ / liter and the density is 0.924 g / cm3. Cooling heat rejection is 20% of the energy supplied to the motor. Calculate:

Acompressor compresses a gas, a pump compresses a liquid. for a given pressure ratio, why does it take more work to compress a gas in a compressor than a liquid in a pump? a)- for a given pressure ratio the average specific volume for a gas is much higher than the average specific volume for a liquid. b)- there is no difference. the only difference is the amount of heat generated (not work) c)- for a given pressure ratio the average volurge for a gas is much higher than the average volume for a liquid. d)-there is no difference