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- 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…The Nevada Solar One solar thermal power plant covers a land area of 140 hectares and has an estimated peak output of 64 MW. If the peak solar fl ux reaching the surface of that part of Nevada is about 630 W/m2, what is the net efficiency of the power plant? Compare your answer with some of the higher effi ciencies of semiconductor solar cells.Determine the net work output and the mean effective efficiency.
- compare how heat transfer(conduction and convection and radiation) efficiency will affect the lifetime of the turbine. Note: The effect of each type of heat transfer separately and accuratelyA mining company depleted more than half of its ore reserves and is no longer using all of its shaft infrastructure. It considers using one of the old shafts for pumped-storage hydro-electricity generation. This means that water will be pumped to the higher level, which is 1 000 m above the bottom level, at night when Eskom charges lower, off-peak, rates. The “higher level” will be changed into a dam (reservoir) by means of plugs that will be installed in some tunnels. The stored water has potential energy, which will be used to generate electricity for the mine at peak hours, when electricity is expensive. The pump that will be installed at the bottom of the column will also be used as a turbine for the generation of electricity The pump-as-turbine (PAT) must pump water to a height of 1 000 m through a column with an internal diameter (ID) of 345 mm. 3.1. Calculate the velocity of the water in the pipe if the quantity of water to be pumped is 220 litres per second (lps). 3.2.…A power plant has an overall efficiency of 30%. The plant generates 30 MW ofelectricity, and uses coal from Montana (as shown ) as fuel. Determine how much coal must be burned to sustain the generation of 30 MW of electricity.
- A hydroelectric power plant is used to convert energy from flowing water initially stored in a reservoir at an elevation of 186 ft from the turbine inlet. Electric power is generated in the turbine-generator system with overall turbine–generator efficiency of 87.21 percent, determine the minimum flow rate (in cubic feet per second) required to generate 121 kW of electricity.A CSP supercritical steam power plant using a concentrating collector arrayfor DSG (refer to Figure 8.12) is operating under the following conditions:• Plant electric power output Pel = 28 MW• Intensity of beam solar radiation incident on the concentrator apertureIbc = 798 W/m2• Aperture area of a single concentrator module Aap = 420 m2• Efficiency of the collector ηc = 0.7• Power plant thermal efficiency ηth = 0.39• Efficiency of the electric generator ηg = 0.97• HTF is water/steam• Superheated steam condition at the absorber outlet/turbine inlet:ps = 250 bars, ts = 600°C• Feedwater temperature at the absorber inlet = tw = 280°C Calculate (i) the power plant overall (electrical) efficiency, (ii) the thermal capacity of the power plant, (iii) the rate of useful heat output of aDSG collector module, (iv) the number of concentrator modules, and (v) the steam generation rate of the solar collector.What is the payback time on a solar hot-water system that cost$ 5,000? Assume the system reduces electrical energy consumption by 4,000 kWhr each year and ilectricity costs 16 cents per kWhr. O 8 years O 4 years O 12 years O 15 years.
- HERE ARE SOME APPLICATIONS OF SHEEL AND TUBE HEAT EXCHANGER: Power Generation HVAC Marine Applications Pulp and Paper Refrigeration Pharmaceuticals Air Processing and Compressor Cooling Metals and MiningPLEASE MAKE A EXPLANATION FOR THISBased on the following information, how does a 1000W microwave compare to the stovetop and electric kettles in terms of water-heating efficiency? Calculate both electricity-to-heat and overall efficiency (assuming electricity from a natural gas fired power plant). Please express your answer as a percentage. -A 1000W microwave takes 120 seconds to boil 8 oz of water. -The boiling point of water is 100°C, and room temperature water is 20°C -The specific heat of water is 4.186 J/gCThe U.S. Department of Energy estimates that 570,000 barrels of oil would be saved per day if every household in the United States lowered the thermostat setting in winter by 6°F (3.3°C). Assuming the average heating season to be 180 days and the cost of oil to be $55/barrel, determine how much money would be saved per year.