Chapter 8, Problem 8.12DOEP

Example 3: A plant produces 1200 liters of biogas daily. Calculate the size of gasholder and gasholder capacity for a biogas plant that feeds a constant load during the following periods daily (Assume uniform consumption of gas) From 06:00 to 08:00 hours (2hrs) From 12:00 14:00 hours (2hrs) - From 19:00-21:00 hours (2hrs) -

Trucks that carry gasoline often have chains dangling from their undercarriages and brushing the ground. Why? Explain briefly.

An aircraft engine produces (1.4800x10^2) kW power in normal idle mode. If the fuel flow rate is (3.07x10^0) kg/min, find its specific fuel consumption (sfc). The answer should be in g/kWh with three significant figures. Note: Your answer is assumed to be reduced to the highest power possible. Your Answer: x10

A city has a fleet of 10 gasoline cars and 5 gasoline light trucks built in 2009. The annual vehicle miles (VMT) traveled by these vehicles are 8,000 miles. How many kg of CO2e does the fleet produces in a year? Which fleet of vehicles (i.e. light truck or gasoline car) produces more CO2e and by how much?   Notes:   Fuel efficiency of gasoline car = 23.8 mpg   Fuel efficiency of light truck = 17.4 mpg   Emission factor of N2O from gasoline car = 0.020 gm/mile   Emission factor of CH4 from gasoline car = 0.021 gm/mile   Emission factor of N2O from light truck= 0.029 gm/mile   Emission factor of CH4 from light truck = 0.025 gm/mile   Emission factor of gasoline = 8.78 kg CO2/gallon

Given that a commercial airliner has a range of 6000 miles using 200 metric tonnes of JP4 fuel, estimate the range of the aircraft burning either gaseous or liquid hydrogen when the same mass of hydrogen as JP4 is used and, the same volume of hydrogen as JP4 is used. The dry mass of the aircraft is 800 tonnes. The fuel properties are as follows Fuel Density kg/m3 JP4 :- 800 H2 gaseous stp :- 0.0824 H2 liquid :- 70.8 Heating Value kJ/kg JP4 :- 45000 H2 gaseous stp :- 120900 H2 liquid :- 120900

Heat transfer to and from a reaction flask is often a critical factor in controlling reaction rate. The heat transferred (q) depends on a heat transfer coefficient (h) for the flask material, the temperature difference (∆T) across the flask wall, and the commonly “wetted” area (A) of the flask and bath, q = hA∆T. When an exothermic reaction is run at a given T, there is a bath temperature at which the reaction can no longer be controlled, and the reaction “runs away” suddenly. A similar problem is often seen when a reaction is “scaled up” from, say, a half-filled small flask to a half-filled large flask. Explain these behaviors.

An internal combustion engine of a car is operating at a brake power of 150 kW. The indicated thermal efficiency of the engine is 30%, and the mechanical efficiency is 85%. The fuel used has a calorific value of 44,000 kJ/kg. Calculate the following: Indicated Power of the engine. Brake Specific Fuel Consumption (BSFC). Fuel consumption rate in kg/hr. Given Data: Brake Power (BP) = 150 kW Indicated Thermal Efficiency = 30% or 0.30 Mechanical Efficiency = 85% or 0.85 Calorific Value of fuel = 44,000 kJ/kg

THERMODYNAMICS; SOLVE THE PROBLEM COMPLETELY In order to save on imported fuel, Philippine researchers propose blending diesel with coconut methyl ester (CME) or cocodiesel derived from trans-esterification of high grade coconut oil. The mixture of these two compounds is called CME-Diesel Blend. The density of CME is 785 kg/m^3 while that of diesel is 885 kg/m^3. If a 150 L fuel tank of a truck is fully filled with CME-Diesel Blend with a density of 840 kg/m^3, how many kilograms of CME and diesel are in the tank?

The fuel efficiency for Vehicle 1 is modelled by A(t) = t+4 / t+2, and vehicle 2, by A(t) = t-2/ t-4. At what operating time(s) will Vehicle 1 have a lower fuel efficiency than Vehicle 2?