A gasoline (LHV=45 mJ/kg) engine has temperatures of 700 K and 2000 K just before and just after the spark plug ignition. What is the approximate AFR?
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A gasoline (LHV=45 mJ/kg) engine has temperatures of 700 K and 2000 K just before and just after the spark plug ignition. What is the approximate AFR?
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- An engine with incomplete-expansion is supplied with steam at 2.75 MPa and 260C.Release occurs at 0.35 MPa and the condenser temperature is 42C. (a) If the brake efficiency is 60% and if 1225 kg/h of steam are used, what is the brake power in kW? (b) If the mechanical efficiency is 87%, what is the indicated steam rate? (c) If the engine drives a generator whose efficiency is 92%, what are the combined thermal efficiency and the combined steam rate?Four lbm/sec of steam enter a turbine with a velocity of 65 ft/sec and the enthalpy of 1350 BTU/lbm. The steam enters the condenser after being expanded to 1075 BTU/lbm and 125 ft/sec. The total heat loss from the turbine casing is 50 BTU/sec. What power is generated by the turbine? A. 1400hp B. 1600hp C. 1500 hp D. 1700 hpAn Ericsson cycle operates on 0.75 lb of oxygen from 60 psia and 1200°F at the beginning of isothermal process to the lower temperature limit of 200°F. If the isothermal expansion ratio is 3, determine QA, QR, Wnet, e, and mean effective pressure.Please provide clear, detailed solution. Thanks
- There is a refrigerator that uses HFC-134a as a refrigerant and operates between 1.4 atm and 12 atm. Calculate the coefficient of performance of this refrigerator and the proportion of vapor at the lowest temperature through the throttle, respectively.The condensing pressure for a Rankine engine is 1 bar (hf= 417.4 kJ/kg). Calculate the net work for 1 kg/s of steam and the thermal efficiency when the steam at the beginning of expansion is at 50 bar and (a) saturated (b) 350°C and (c) 640°C. Note the variation of efficiency and the quality at the end of the expansion.In a steam power plant, the condenser pressure is 10 kPa. The turbine and pump isentropic efficiencies are both 85 %. Draw the schematic and T-S diagrams. Label the points by setting point 1 at the condenser outlet, point 2 at the pump outlet, point 3 at the boiler outlet, and point 4 at the turbine outlet. Use the label 2a and 4a for the points due to the isentropic efficiency of the pump and turbine, respectively. Use 2 decimal places for the enthalpy and other energies in solving and for the final answers. For the steam quality (x) and entropy (s), use 4 decimal places in solving. For the specific volume, use 6 decimal places. The pressure and the temperature of steam that enters the turbine are 4.5 MPa and 800 oC Determine the following: (INPUT YOUR ANSWERS ON THE BLANK SPACES PROVIDED.) Enthalpy at point 1 in kJ/kg = Enthalpy at point 2 in kJ/kg = Enthalpy at point 3 in kJ/kg = Enthalpy at point 4 in kJ/kg = Actual Enthalpy at point 2a in kJ/kg = Actual Enthalpy at point…
- Good Day , Am struggling with the two questions below , please assit Question 1 A solar-power-tower plant is considered for Dakar, Senegal. Heliostats with a total area of 80,000 m2 are to be used to reflect solar radiation into a receiver. When the solar irradiation is 950 W/m2, steam is produced at 2 MPa and 400°C at a rate of 20 kg/s. This steam is expanded in a turbine to 20 kPa pressure. The enthalpy at the exit of the turbine is 2484.5 kJ/kg.(a) Determine the power output and the thermal efficiency of the plant when the solar radiation is 950 W/m2.(b) How much electricity can be produced per year if the average thermal efficiency is 15 % and the generator efficiency is 96 %? Question 2 To reduce cooling electricity consumption in an industrial plant, it is proposed to install an absorption refrigeration system running on solar energy. The absorption system costs $300,000 and the operating and maintenance expenses are $8000 per year. It is estimated that this absorption system…Refrigerant-134a at 1.4 MPa and 70°C is throttled to a pressure of 0.6 MPa. The temperature of the refrigerant after throttling is (a) 70°C (b) 66°C (c) 57°C (d) 49°C (e) 22°Cwhat is the efficiency of the diesel engine if the heat added during the constant pressure combustion is 19 BTU and the heat rejected is 9 BTU
- A gas turbine expands 3 kg/s of air from 10 bar and920Cto 1 bar adiabatically with anisentropic efficiency of 92%. Calculate the exhaust temperature and the power output. =1.41;Cp =1010 J / kgK7- A food product with a specific temperature of 3.18 kJ / kg K weighing 50 kg is heated by adding 9800 kJ heat in an oven. Since the outlet temperature of the food is 383 K, how many oC is the inlet temperature? A.) 51.6B.) 444.63C.) 45D.) 48.4E.) 321.4Simulates the following thermodynamic cycle. Flow rate (Refrig-23) R-23 is 1 kg per hour and the pressure pressure in all converters is zero. Find the flow rate (Refrig-22) of R-22 in kgmole / h and W1. Compressors have an adiabatic range of 75%. (FP.PR)