1. The choice of a taller tower generally results in higher energy yield. Determine the number of years it takes to offset the cost differential of choosing a taller tower based on the two scenarios described below: a. Dollar value of 1.0 kWh of electricity set at $0.065 and constant over the period necessary for computations b. i. Dollar value of 1.0 kWh of electricity set at $0.065 at the start, and increasing by 6% annually ii. The additional capital subject to 2.5% interest. Use the Simple Methods discussed in class for modeling the effects of height on changes in wind speed. Generator 10 kW Rotor diameter 7.0 m Hub height/standard Hub height/desired Average wind speeds of the site Air density Overall efficiency 100.0 ft 150.0 ft 5.4 m/s (at 100.0 ft) 1.2 kg/m3 0.35 (assume constant) Surface roughness coefficient 0.1 The total cost of the tower for units 100 ft tall or higher can be estimated by: Total tower cost = $2,500.00 + h?x $0.30 Where, h denotes the tower height in ft. List any further assumptions you make. Payback period: The number of years that it will take the taller tower to offset the extra cost by the Figher energy vield. with C

1. The choice of a taller tower generally results in higher energy yield. Determine the number of years it takes to offset the cost differential of choosing a taller tower based on the two scenarios described below: a. Dollar value of 1.0 kWh of electricity set at $0.065 and constant over the period necessary for computations b. i. Dollar value of 1.0 kWh of electricity set at $0.065 at the start, and increasing by 6% annually ii. The additional capital subject to 2.5% interest. Use the Simple Methods discussed in class for modeling the effects of height on changes in wind speed. Generator 10 kW Rotor diameter 7.0 m Hub height/standard Hub height/desired Average wind speeds of the site Air density Overall efficiency 100.0 ft 150.0 ft 5.4 m/s (at 100.0 ft) 1.2 kg/m3 0.35 (assume constant) Surface roughness coefficient 0.1 The total cost of the tower for units 100 ft tall or higher can be estimated by: Total tower cost = $2,500.00 + h?x $0.30 Where, h denotes the tower height in ft. List any further assumptions you make. Payback period: The number of years that it will take the taller tower to offset the extra cost by the Figher energy vield. with C

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

Chapter2: Matter And Energy

Section: Chapter Questions

Problem 27RQ: How many Btu/h would be produced in a 12-kW electricheater?

See similar textbooks

Similar questions

Problem 8The demand for electric power is usually much higher during the day than it is at night, andutility companies often sell power at night at much lower prices to encourage consumers to usethe available power generation capacity and to avoid building new expensive power plants thatwill be used only a short time during peak periods. Utilities are also willing to purchase powerproduced during the day from private parties at a high price. Suppose a utility company is selling electric power for $0.07/kWh at night and is willing to pay $0.15/kWh for power produced during the day. To take advantage of this opportunity, an entrepreneur is considering building a large reservoir 100 m above the lake level, pumping water from the lake to the reservoir at night using cheap power, and letting the water flow from the reservoir back to the lake during the day, producing power as the pump–motor operates as a turbine–generator during reverse flow. Preliminary analysis shows that a water flow…
Feasibility Analysis:1. Identify at least 5 alternative options with regards to solar thermal heating and solar energy and provide reasons with calculations to indicate usage of the alternative solution. 2. Do a Feasibility Analysis according to the following sections. Each section must be thoroughly investigated with calculations to indicate the feasibility where possible. 2.1.Economic Aspects of Renewable energy source evaluation2.2.Basic concepts2.3.Basic Methods for natural resource evaluation2.4.Basic economic Problems2.5.Cost-benefit analysis2.6.Economic impact Analysis
Determine the power output, in hp, of an animal pulling a plow at a speed of 3 kph. The draft is 75 kg.
A hydroelectric power plant operates at its rated power of 12 MW. If the plant has produced 26 million kWh of electricity in a specified year, the number of hours the plant has operated that year is (a) 2167 h (b) 2508 h (c) 3086 h (d) 3710 h (e) 8760 h
A car is towing a 50 kg load using a cable on a rough track with an acceleration of 4 m/s2. Determine the amount of work the car does on the load for a 300m span (g=10m/s2). a. 120 kJ b. 150 kJ c. 160 kJ d. 180 kJ
Does the work required to lift a book to a high shelf depend on how fast (in seconds) you raise it.why?
What is the mass of an object that falls freely under the influence of gravity from an elevation of 100 m above the earth's surface? The downward velocity is 100 m/s and strikes the earth at 109.4m/s. Take g = 9.81 m/s2. Ans. m=40kg
Define How to energy change of a system during a process is equal to the net work and heat transfer between the system and its surroundings.
During a one year time period, how many gallons of water would the average household save by using an efficiency washer vs a regular washer? Is this one year savings more or less than the amount of water an average person drinks in a lifetime? Explain and show your assumptions, calculations, and conversions. Consider it to be essentially 2 separate problems: How much water is saved in a one year period when using an efficiency washer vs regular washer - answer based on your assumptions and calculations for full credit How much water does an average person drink in a lifetime – arrive at this answer based on your assumptions and calculations Compare the answers to those 2 questions to arrive at your conclusion Below are 2 pieces of information that you might find helpful there are 128 oz in a gallonthere are 365 days in a year and also 52 weeks in a year
A hydraulic turbine is used to generate power by using water in a dam. The elevation difference between the free surface stream and the downstream of the dam is 120 m. The water is supplied to the turbine at a rate of 150 kg/s. if the shaft power output from the turbine is 155 KW, the efficiency of the turbine is. Kindly include FBD. Choices: A.0.85 B.0.77 C.0.88 D.0.80
A steam power station uses coals of calorific value of 6045-kcal/kg. The overall efficiency ofthe power station is 21.5% and a coal power station uses 4.05-tonnes of coal every 15 minutesto generate the maximum demand. The purchasing price of coals is R600 per tonne. (NB:1 kWh = 861 kcal)(a) Determine the coal consumption in kg per kWh.(b) Determine the cost of purchasing the coals per week if the load factor is 65%.
Given the lifting table shown below , The diameter of the plunger DP 8 cm.The ram diameter DR 48 cm , The efficiency is 100 %, The stroke of the plunger is 18 cm. The ram has to raise a load F2 = 2 kN. Find : a) the force F1 exerted on the plunger b) the number of strokes needed to raise the load given above by a distance of 10 cm c) the volume of oil pumped if the load moves by 20 cm ( using plunger force in a ) d) What will be the new diameter of the ram piston if the new load force is 16 times the force exerted in the plunger the diameter of the plunger is kept to 8cm .