a) A hot water heater in a residential home runs for an average of 3 hours per day with a heat energy input of 4.1 kW. What would be the annual cost for hot water in this home using an electric hot water heater if the cost of electricity is $0.13/kWh [round your final answer to zero decimal places]? b) A hot water heater in a residential home runs for an average of 3.2 hours per day with a heat energy input of 3.7 kW. What would be the annual cost for hot water in this home using a gas hot water heater if the cost of natural gas is $0.33/m3? The gas water heater can get 23 MJ of energy from 1 m3 of natural gas. [round your final answer to zero decimal places]?

a) A hot water heater in a residential home runs for an average of 3 hours per day with a heat energy input of 4.1 kW. What would be the annual cost for hot water in this home using an electric hot water heater if the cost of electricity is $0.13/kWh [round your final answer to zero decimal places]? b) A hot water heater in a residential home runs for an average of 3.2 hours per day with a heat energy input of 3.7 kW. What would be the annual cost for hot water in this home using a gas hot water heater if the cost of natural gas is $0.33/m3? The gas water heater can get 23 MJ of energy from 1 m3 of natural gas. [round your final answer to zero decimal places]?

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 40PE: (a) What is the available energy content, in joules, of a battery that operates a 2.00-W electric...

See similar textbooks

Similar questions

A solar panel of length L and width W produces 28.4 kWh in a day. Under the same conditions (i.e. the same amount of solar energy available and the same efficiency) a solar panel of length 2L and width 2W would produce how many kWh in a day? Round off your answer to 2 decimal places, but do not write the unit.
A hot water heater in a residential home runs for an average of 2.5 hours per day with a heat energy input of 4 kW. What would be the annual cost for hot water in this home using a gas hot water heater if the cost of natural gas is $0.38/m3? The gas water heater can get 26 MJ of energy from 1 m3 of natural gas. [round your final answer to zero decimal places]?
The average electricity consumption of a house in Gainesville is known to be 1,036 kWh in a month (One month = 30 days). They would like to install solar panels of 30 % efficiency to generate this electricity. Given that the average solar power density in Gainesville is 5.47 kWh/m2/day, how much surface area must the panels occupy? Calculate the result in m² but do not write the unit. Round off you E swer to a whole number (zero decimal place.)
Explain the difference between energy and power. If a household has an average annual energy consumption of 8,500 kWh, what is the average hourly power demand. How would you expect this to vary during the day and at different times of the year? For the toolbar, press ALT+F10 (PC) or ALT+FN+F10 (Mac). B I U S Paragraph Open Sans,s... v 10pt Ix •.. !!! !!!
Question 7: Certain areas in Arizona, Nevada, California and Texas can have up to 4000 sunny hours a year. The fact that these vast lands are less populated and agriculturally not suitable makes them ideal for solar power plants. Though most commercial solar panels have efficiencies from 15% to 20%, researchers have now developed solar cells with efficiencies approaching 50%. If you are asked to plant a solar energy system in these areas using the newest technology, how much land do you need to produce enough energy for the US. Make the conservative assumptions that the average light energy landing to the Earth' surface is 1.0 cal/(cm2 min). An estimate for the US energy consumption by major sources is given below. U.S. primary energy consumption by major sources, 1950-2019 quadrillion British thermal units 110 100 90 80 70 60 50 40 30 20 10 1950 1955 1960 1965 1970 1975 1980 1985 1990 1995 2000 2005 2010 2015 renewables nuclear petroleum natural gas coal
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? ).
In Arizona, photovoltaic (PV) panels can generate an average annual power of 1 MW/acre. If there are 311 sunny days per year in Arizona, but only 160 sunny days per year in Pennsylvania, how much average power (in MW/acre) could the same PV panels generate in Pennsylvania? Please include two decimal places in your answer. Note: assume that a cloudy day delivers 0 watts/acre of solar power. This is not true, but it simplifies the problem for us.
2.3 Atypical incandescent reading lamp runs at 60 W. If it is left on constantly, how much energy (J) is consumed per day, and what is the weekly cost if energy is charged at a rate of 12.5 cents per kilowatthour? Ans: 2.1 (c); 2.2 (d); 2.3 5.18 MJ, S1.26.
A previous part of the question says that the total electrical energy the battery can produce is 5832000 Joules. The battery has a mass of 18.1 kg. What total mass of such batteries would be required to deliver the same effective mechanical energy as 12 gallons of gasoline? Assume that the efficiency of an electrically powered car is 2.5 times that of a gasoline-powered car for the conversion to mechanical energy, and that energy content of 1 gallon of gas =1.32×10^8 Joules.
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?)
In 2014 the Netherlands installed the world’s first solar bike path. Let’s compute the cost of mitigation relative to electricity from coal. Of course, the sidewalk probably wasn’t intended to be a cost-effective electricity option. It's designed for qualitative rather than quantitative value, to raise awareness. However, there are real proposals to scale up this kind of technology to large numbers of sidewalks and roadways, so cost analysis is relevant. The project cost $3.75 million for ~30kW of installed capacity (based on typical 150W/m2 solar panels). Assume a CCF of 9%, and a utilization of 11% (probably generous for solar panels flat on the ground in the Netherlands). You may ignore all other costs. Part 1. What is the levelized cost of electricity from the solar sidewalk? $/kWh Part 2. What is the cost of mitigation (in $/tCO2) relative to coal electricity at $0.09/kWh and 0.9 kg CO2/kWh. You may assume the solar sidewalk causes 0 kg CO2 emissions/kWh
The energy contents, unit costs, and typical conversion efficiencies of various energy sources for use in water heaters are given as follows: 1025 Btu/ft3, $0.012/ft3, and 85 percent for natural gas; 138,700 Btu/gal, $2.2/gal, and 75 percent for heating oil; and 1 kWh/kWh, $0.11/kWh, and 90 percent for electric heaters, respectively. Determine the lowest-cost energy source for water heaters.