One energy concept is cogeneration system of photovoltaic solar cells combined with a thermal capture of the waste heat absorbed for hot water in homes. Do a first law analysis of a 2 kWe system where the solar photovoltaics are collecting 50% of the incoming solar irradiance, and are 10% efficient in converting sunlight directly to electrical power. What is the thermal energy available? How much water can you heat?If you do not heat water, what happens to that thermal energy?

One energy concept is cogeneration system of photovoltaic solar cells combined with a thermal capture of the waste heat absorbed for hot water in homes. Do a first law analysis of a 2 kWe system where the solar photovoltaics are collecting 50% of the incoming solar irradiance, and are 10% efficient in converting sunlight directly to electrical power. What is the thermal energy available? How much water can you heat?If you do not heat water, what happens to that thermal energy?

College Physics

1st Edition

ISBN:9781938168000

Author:Paul Peter Urone, Roger Hinrichs

Publisher:Paul Peter Urone, Roger Hinrichs

Chapter7: Work, Energy, And Energy Resources

Section: Chapter Questions

Problem 43PE: (a) Calculate the power per square meter reaching Earth's upper atmosphere from the Sun. (Take the...

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(a) What is the available energy content, in joules, of a battery that operates a 2.00-W electric clock for 18 months? (b) How long can a battery that can supply 8.00104 J run a pocket calculator that consumes energy at the rate of 1.00103 ?
(a) How long will the energy in a 1470kJ (350kcal) cup of yogurt last in a woman doing work at the rate of 150 W with an efficiency of 20.0% (such as in leisurely climbing stairs)? (b) Does the time found in part (a) imply that it is easy to consume more food energy than you can reasonably expect to work off with exercise?
At a certain location, the solar power per unit area reaching Earth’s surface is 200 W/m2, averaged over a 24-hour day. If the average power requirement in your home is 3 kW and you can convert solar power to electric power with 10% efficiency, how large a collector area will you need to meet all your household energy requirements from solar energy? (Will a collector fit in your yard or on your roof?)
At a certain location, the solar power per unit area reaching Earth's surface is 200 W/ m^2, averaged over a 24-hour day. If the average power requirement in your home is 3 kW and you can convert solar power to electric power with 10 % efficiency, how large a collector area will you need to meet all your household energy requirements from solar energy? (Will a collector fit in your yard or on your roof? ).
Suppose you require 2500 food Calories per day. a. What is your average power, in watts? b. How much energy, in joules, do you require from food in a year? Counting all forms of energy (such as gasoline, electricity, and energy for heating), the average person consumes about 350 billion joules of energy each year. Compare this value to the energy needed from food alone. a. What is your average power, in watts? Approximately 121 watts (Round to the nearest whole number as needed.) b. The energy required from food is approximately billion joules per year. (Round to the nearest tenth as needed.)
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The newly appointed Government of a small island, depend on the import of fossil fuels to produce electricity, has the desire toinvest in one or two renewable energy technologies. The advantage of the island is the number of different renewable energypotentials. The cost of electricity on the island is $0.39 kWh.1) Using solar radiation photovoltaic technologies, it was estimated that 500 rooftops, with a total surface area of 456 000 m2 will be available to install the photovoltaic panels. Assume that the solar panels actually cover 90% of the available surface area. Given, the size of a standard photovoltaic cell is 156 mm by 156 mm and for a silicon photovoltaic cell, each PV cellproduces a current of 2.5 A at a voltage of 0.5 V. The average daily irradiance for the island is 185 W/m2. Assume the initial capacity expenditure evaluated on a yearly basis of the photovoltaic system, that covers, 90% of the available surface area is US$600 000 and the annual operating cost is US $5…
The newly appointed Government of a small island, depend on the import of fossil fuels to produce electricity, has the desire to invest in one or two renewable energy technologies. The advantage of the island is the number of different renewable energy potentials. The cost of electricity on the island is $0.39 kWh. 1) Using solar radiation photovoltaic technologies, it was estimated that 500 rooftops, with a total surface area of 456 000 m2 , will be available to install the photovoltaic panels. Assume that the solar panels actually cover 90% of the available surface area. Given, the size of a standard photovoltaic cell is 156 mm by 156 mm and for a silicon photovoltaic cell, each PV cell produces a current of 2.5 A at a voltage of 0.5 V. The average daily irradiance for the island is 185 W/m2 . Assume the initial capacity expenditure evaluated on a year basis of the photovoltaic system, that covers, 90% of the available surface area is US $600 000 and the annual operating cost is US…
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