A pumped storage scheme comprises two reversible pump turbines which transfer water between an upper and lower reservoir with a head difference of 400m. During a typical daily cycle, electrical power of 120kW is supplied to the pumps which deliver 15 litres/s for 6 hours overnight to the upper reservoir. During the daylight hours, a flow of 10 litres/s is used to release the same quantity of water to generate electrical energy. If the efficiency during generation is 90%, how much energy is lost per day? d. A horizontal-axis wind turbine with rotor 80m in diameter is 40% efficient in 15m/s wind at 600m altitude and 30°C. Calculate the total amount of power the wind turbine would produce in those winds. TABLE 6.1 Density of Dry Air at a Pressure of 1 Atmosphere Temperature Temperature Density Density Ratio (°C) (°F) (kg/m³) (KT) iii. 10 15 20 25 30 35 40 5.0 14.0 23.0 32.0 41.0 50.0 59.0 68.0 77.0 86.0 95.0 104.0 1.368 1.342 1.317 1.293 1.269 1.247 1.225 1.204 1.184 1.165 1.146 1.127 tynes 1.12 1.10 1.07 1.05 1.04 1.02 1.00 0.98 0.97 0.95 0.94 0.92 "The density ratio Ky is the ratio of density at 7 to the density at the standard (boldfaced) 15°C. TABLE 6.2 Air Pressure at 15°C as a Function of Altitude Altitude (meters) (Feet) 0 200 400 600 800 1000 1200 Altitude Pressure (atm) 1400 1600 1800 2000 2200 0 656 1312 1968 2625 3281 3937 4593 5249 5905 6562 7218 1 0.977 0.954 0.931 0.910 0.888 0,868 0.847 0.827 0.808 0.789 0.771 Pressure Ratic (KA) 1 0.977 0.954 0.931 0.910 0.888 A small business man has decided to install a PV energy system to fully supply electrical energy to his shop. The engineer assigned the job has sized the PV array to fully supply the small commercial load. He has also included a battery bank to supply the load for a maximum of 12 hours when the energy from the PV system is inadequate and a 10kW diesel generator as standby. 0.868 0.847 0.827 0.808 0.789 0.771 i. Based on your knowledge of connection types, name and sketch the layout of the connection type you would recommend for implementation. Ensure that the load is always fully supplied. ii. Explain the purpose and relevance of each component of the connection type you have chosen. Also write an argument justifying your choice over other possible connection

A pumped storage scheme comprises two reversible pump turbines which transfer water between an upper and lower reservoir with a head difference of 400m. During a typical daily cycle, electrical power of 120kW is supplied to the pumps which deliver 15 litres/s for 6 hours overnight to the upper reservoir. During the daylight hours, a flow of 10 litres/s is used to release the same quantity of water to generate electrical energy. If the efficiency during generation is 90%, how much energy is lost per day? d. A horizontal-axis wind turbine with rotor 80m in diameter is 40% efficient in 15m/s wind at 600m altitude and 30°C. Calculate the total amount of power the wind turbine would produce in those winds. TABLE 6.1 Density of Dry Air at a Pressure of 1 Atmosphere Temperature Temperature Density Density Ratio (°C) (°F) (kg/m³) (KT) iii. 10 15 20 25 30 35 40 5.0 14.0 23.0 32.0 41.0 50.0 59.0 68.0 77.0 86.0 95.0 104.0 1.368 1.342 1.317 1.293 1.269 1.247 1.225 1.204 1.184 1.165 1.146 1.127 tynes 1.12 1.10 1.07 1.05 1.04 1.02 1.00 0.98 0.97 0.95 0.94 0.92 "The density ratio Ky is the ratio of density at 7 to the density at the standard (boldfaced) 15°C. TABLE 6.2 Air Pressure at 15°C as a Function of Altitude Altitude (meters) (Feet) 0 200 400 600 800 1000 1200 Altitude Pressure (atm) 1400 1600 1800 2000 2200 0 656 1312 1968 2625 3281 3937 4593 5249 5905 6562 7218 1 0.977 0.954 0.931 0.910 0.888 0,868 0.847 0.827 0.808 0.789 0.771 Pressure Ratic (KA) 1 0.977 0.954 0.931 0.910 0.888 A small business man has decided to install a PV energy system to fully supply electrical energy to his shop. The engineer assigned the job has sized the PV array to fully supply the small commercial load. He has also included a battery bank to supply the load for a maximum of 12 hours when the energy from the PV system is inadequate and a 10kW diesel generator as standby. 0.868 0.847 0.827 0.808 0.789 0.771 i. Based on your knowledge of connection types, name and sketch the layout of the connection type you would recommend for implementation. Ensure that the load is always fully supplied. ii. Explain the purpose and relevance of each component of the connection type you have chosen. Also write an argument justifying your choice over other possible connection

Refrigeration and Air Conditioning Technology (MindTap Course List)

8th Edition

ISBN:9781305578296

Author:John Tomczyk, Eugene Silberstein, Bill Whitman, Bill Johnson

Publisher:John Tomczyk, Eugene Silberstein, Bill Whitman, Bill Johnson

Chapter40: Typical Operating Conditions

Section: Chapter Questions

Problem 10RQ: The seasonal energy efficiency ratio (SEER) includes the energy used in the _____and _____cycles.

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