Concept explainers
Consider a household that uses 14,000 kWh of electricity per year and 900 gal of fuel oil during a heating season. The average amount of CO2 produced is 26.4 lbm/gal of fuel oil and 1.54 lbm/kWh of electricity. If this household reduces its oil and electricity usage by 15 percent by implementing some energy conservation measures, determine the reduction in the amount of CO2 emissions by that household per year.
Want to see the full answer?
Check out a sample textbook solutionChapter 2 Solutions
Thermodynamics: An Engineering Approach
Additional Engineering Textbook Solutions
Introduction to Heat Transfer
Vector Mechanics for Engineers: Statics
Fundamentals of Heat and Mass Transfer
Engineering Mechanics: Dynamics (14th Edition)
Heating Ventilating and Air Conditioning: Analysis and Design
Automotive Technology: Principles, Diagnosis, And Service (6th Edition) (halderman Automotive Series)
- On average, 0.59 kg of CO2 is produced for each kWh of electricity generated from a power plant that burns natural gas. A typical new household refrigerator uses about 700 kWh of electricity per year. Determine the amount of CO2 production that is due to the refrigerators in a city with 300,000 households.arrow_forwardKing Orquinaza bought a diesel electric plant in a remote part of Ilo-Ilo province that utilizes diesel fuel with an API of 28 at 15.6 deg C. The plant consumes 680 liters of diesel fuel at 26.6 deg C in 24 hours whie the power generated for the same period amounts to 1980 KW-hrs. Determine the density of the fuel at 26.6 deg C in kg/liters.arrow_forwardThe roofs of many homes in the United States are covered with photovoltaic (PV) solar cells that resemble roof tiles, generating electricity quietly from solar energy. An article stated that over its projected 30-year service life, a 4-kW roof PV system in California will reduce the production of CO2 that causes global warming by 433,000 lbm, sulfates that cause acid rain by 2900 lbm, and nitrates that cause smog by 1660 lbm. The article also claims that a PV roof will save 253,000 lbm of coal, 21,000 gallons of oil, and 27 million ft3 of natural gas. Making reasonable assumptions for incident solar radiation, efficiency, and emissions, evaluate these claims and make corrections if necessary.arrow_forward
- How much annual CO2 emissions (in tons per year) would be avoided if the USA doubles its hydroelectric capacity and reduces the coal-fired power plants at the same time? The average overall thermal efficiency of the coal-fired power plants is 36% and the heating value of carbon is 32,700 kJ/kg.arrow_forwardA car engine with a power output of 64 hp has a thermal efficiency of 24%. Determinethe fuel consumption rate of this car if the fuel has a heating value of 18,000 Btu/lbm.arrow_forwardWhat types of energy are consumed in Texas? How is this energy used?arrow_forward
- When a hydrocarbon fuel is burned, almost all of the carbon in the fuel burns completely to form CO2 (carbon dioxide). On average, 0.59 kg of CO2 is produced for each kWh of electricity generated from a power plant that burns natural gas. A typical new household refrigerator uses about 700 kWh of electricity per year. A city's refrigerators produce 20,650 mton CO2/year (50,000 households in the city). If the area of the city is 190 miles2, and if all that CO2 accumulates in the atmosphere, calculate the increase in CO2 concentration by weight in the atmosphere knowing that each cm2 of area carries a column of air that weighs 1 kg. If 1 mature tree absorbs 48 lbm of CO2 per year, what is the ratio of trees to households this city should have to counter the effect of refrigeration?arrow_forwardAn engine uses about 0.24 kg of fuel/kW-hr. If the heating value of the fuel is 50 MJ/kg, what is the thermal efficiency?arrow_forwardA logging firm in Isabela operates a diesel electric plant to supply its electrical energy requirements. During a 24 hour period, the plant consumed 250 gallons of fuel at 80 deg. Farenheit and produced 2900 kW-hrs. Industrial fuel is used at 30 degrees API and was purchased at 30 pesos per liter at 60 degrees Fahrenheit. Determine the Heat of Combustion for the Fuel in KJ/Hr.arrow_forward
- An automobile engine consumes fuel at a rate of 22 L/h and delivers 55 kW of power to thewheels. If the fuel has a heating value of 44,000 kJ/kg and a density of 0.8 g/cm3, determinethe efficiency of this engine. Hint, Qa= mass of fuel * heating value.arrow_forwardIf a house needs a minimum heat transfer rate of 75 kJ/h (i.e., 75 kJ of heat needs to be transferred into the house during one hour) to maintain a pleasant indoor temperature. If one wants to use a heat pump with a COP of 5.55 to fulfill this heat transfer rate, what is the corresponding electricity (in kWh) consumption to run such a heat pump for one hour?arrow_forwardA school is paying $0.09/kWh for electric power. To reduce its power bill, the school installs a wind turbine with a rated power of 30 kW. If the turbine operates 2200 hours per year at the rated power, determine the amount of electric power generated by the wind turbine and the money saved by the school per year.arrow_forward
- Elements Of ElectromagneticsMechanical EngineeringISBN:9780190698614Author:Sadiku, Matthew N. O.Publisher:Oxford University PressMechanics of Materials (10th Edition)Mechanical EngineeringISBN:9780134319650Author:Russell C. HibbelerPublisher:PEARSONThermodynamics: An Engineering ApproachMechanical EngineeringISBN:9781259822674Author:Yunus A. Cengel Dr., Michael A. BolesPublisher:McGraw-Hill Education
- Control Systems EngineeringMechanical EngineeringISBN:9781118170519Author:Norman S. NisePublisher:WILEYMechanics of Materials (MindTap Course List)Mechanical EngineeringISBN:9781337093347Author:Barry J. Goodno, James M. GerePublisher:Cengage LearningEngineering Mechanics: StaticsMechanical EngineeringISBN:9781118807330Author:James L. Meriam, L. G. Kraige, J. N. BoltonPublisher:WILEY