A 60 MW steam power station has a thermal efficiency of 30%. If the coal burnt has a calorific value of 6950 kcal/kg, calculate : (i) the coal consumption per kWh, (ii)the coal consumption per day.
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A 60 MW steam power station has a thermal efficiency of 30%. If the coal burnt has a calorific value of
6950 kcal/kg, calculate :
(i) the coal consumption per kWh,
(ii)the coal consumption per day.
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- Consider a 400-MW, 32 percent efficient coal-fired power plant that uses cooling water withdrawn from a nearby river (with an upstream flow of 10-m3/s and temperature 20 °C) to take care of waste heat. The heat content of the coal is 8,000 Btu/lb, the carbon content is 60% by mass, and the sulfur content is 2% by mass. How much electricity (in kWh/yr) would the plant produce each year? How many pounds per hour of coal would need to be burned at the plant? Estimate the annual carbon emissions from the plant (in metric tons C/year). If the cooling water is only allowed to rise in temperature by 10 °C, what flow rate (in m3/s) from the stream would be required? What would be the river temperature if all the waste heat was transferred to the river water assuming no heat losses during transfer? Estimate the hourly SO2 emissions (in kg/h) from the plant assuming that all the sulfur is oxidized to SO2 during combustion.A 600 MW coal-fired power plant has an overall thermal efficiency of 38%. It is burning coal that has a heating value of 12,000 Btu/lb, an ash content of 5%, a sulfur content of 3,0%, and a CO2 emission factor of 220 IWmillion Bin. Calculate the heat emitted to the environment (Btu/sec), the coal feed rate (tons/day), the degree (%) of sulfur dioxide control needed to meet an emission standard of 0,15 lh SO2/inillion Bin of heat input, and the CO2 emission rate (metric tons/day).A 1000 MW coal fired power plant (30% efficiency). The coal is 75% carbon and has a heat content of 10, 000 BTU/lb. What is the carbon emission (ton carbon per year)?A 1000 MW natural gas plant (45% efficiency). The gas is CH4 with a heat content 800 BTU/mol. What is the carbon emission (ton carbon per year)?Calculate carbon emission reduction if the above natural gas plant is used to replace the coal fired plant.(Here ton is metric ton, 1 ton=2,200 lb)
- In a refrigeration cycle that is used to cool products of a grocery store has an efficiency of 46 %. The total heat load of the grocery store in weekdays is 50 kW while in weekends is 100 kW. If the system uses electricity that could power the store within the whole month. What will be its consumption for a month? * 1304 Kw O 1.30 Kw 600 kW O 150 KwAn engine absorbs 100 J and rejects 60 J in each cycle. (a) What is its efficiency? (b) If each cycle takes 0.5 s, find the power output of this engine in watts.If the energy present in a jet of water of 20 cm diameter and having a velocity of 25 m/s could be extracted by a device with 90% efficiency, the power extracted would be nearly. sec² m tak ing 1 2g 0.051
- The figure below shows a pump delivering 0.014 m3/s of crude oil (SG = 0.85) from an underground storage drum to the first stage of a processing system. (a) If the total energy loss in the system is , calculate the power added by the pump in kW. (b) If the power input to the pump is 16.5 kW, what is the mechanical efficiency of the pump?Water falls from a height of 500 m and the mass of water is 50 kg. What is approximately the rise in temperature of water at the bottom if the whole energy is used to heat the water? Specific heat of water is 4.18 kJ/kg-deg C. O 5000 deg C O 1173 deg C O 500 deg C O 0.23 deg C O none of the aboveAn average American consumes approximately 105 kJ of energy per day. The average life expectancy of an American is 77.9 years. How much coal would need to be burned to provide enough energy to meet a person's energy demands if the efficiency of energy production from coal is 38%? ☐g coal
- Air contained in a piston-cylinder assembly undergoes the power cycle shown in the figure below. P (bar) 6.0 1 1.0 3 Isothermal process 2 0 1.0 6.0 v (m³/kg) Assuming ideal gas behavior for the air, evaluate the thermal efficiency of the cycle. n = i %2. Consider the system described in the news: at night, when there is energy left, water is pumped from a large lake to a reservoir at 80 m above the lake level. During the day, this water is used to generate energy in a turbine located 80 m below the elevated reservoir. Considering that the water flow is always 5000 liters/s (both at the inlet of the reservoir and at the outlet) and that the pump and turbine efficiencies are 70%, what is the power (in kW) required by the pump and the power (in kW) recovered in the turbine. Data: The pipe diameter is always the same along the system (d = 0.5 m); g = 10 m/s2; γ = 9810 N/m3. Matter transport phenomena; Please make it typeable as handwriting interferes with understandingThe contents of a tank are to be mixed with a turbine impeller that has six flat blades. The diameter of the impeller is 3 m, and the impeller is installed 1.25 m above the bottom of a 6-m deep tank. If the temperature is 30°C and the impeller is rotated at 30 rev/min, what will be the power consumption? Find the Reynolds number using Eq. (5-11).