Sustainable Energy
2nd Edition
ISBN: 9781337551663
Author: DUNLAP, Richard A.
Publisher: Cengage,
expand_more
expand_more
format_list_bulleted
Concept explainers
Question
Chapter 1, Problem 20P
To determine
Find the time required to increase the temperature of water by
Expert Solution & Answer
Trending nowThis is a popular solution!
Students have asked these similar questions
Water falls from a height of 500 m and the mass of water is
50 kg. What is approximately the rise in temperature of
water at the bottom if the whole energy is used to heat the
water? Specific heat of water is 4.18 kJ/kg-deg C.
O 5000 deg C
O 1173 deg C
O 500 deg C
O 0.23 deg C
O none of the above
Calculate the amount of energy required in BTU to heat the air in a 10°F
house 30 by 50 by 40 ft and increase the temperature by 70F at constant
pressure.
A certain brand of hotdog cooker works by applying a potential difference of 146 V across opposite ends of a hot dog and allowing it to
cook by means of the thermal energy produced. The current is 12.8 A, and the energy required to cook one hot dog is 60.8 kJ. If the
rate at which energy is supplied is unchanged, how long will it take to cook three hot dogs simultaneously?
Number
i
Units
Chapter 1 Solutions
Sustainable Energy
Knowledge Booster
Learn more about
Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, civil-engineering and related others by exploring similar questions and additional content below.Similar questions
- A home is heated with propane with a 100,000 BTU furnace size and 95% efficiency. The monthly heating degree days is 5000. Using the energy estimation discussed in this chapter, estimate the monthly and annual gas consumption to heat the building if the home is to be kept 68°F.arrow_forward6.0 g of cream at 13.2 °C are added to an insulated cup containing 150.0 g of coffee at 92.9 °C. Calculate the equilibrium temperature of the coffee. You may assume no heat is lost to the cup or surroundings, and that any physical properties of cream and coffee you need are the same as those of water. Be sure your answer has 3 significant digits.arrow_forwardFor a building located in Madrid, Spain with annual heating degree-days (dd) of 4654, a heating load (heat loss) of 30,000 kj/h, and a design temperature difference of 30° C (20° C indoor), estimate the annual energy consumption. If the building is heated with a furnace with an efficiency of 92%, how muchgas is burned to keep the home at 20° C? State your assumptions.arrow_forward
- How much natural gas do you need to burn to heat fifty-seven gallons of water? (Assume a heating value of 1,000 Btu/ft³ for natural gas and 100% efficiency. Note that 1 gallon of water has a mass of 8.34 lbm. Enter the volume in ft³ needed to increase the temperature of the water by 1°F.) ft³arrow_forwardWhen 1 cu ft of natural gas is burned, 1,050 Btu of heat are produced. In oneday, a building uses 761,250 Btu of heat. How many cubic feet of gas areburned?arrow_forward1 kg of steam undergoes a reversible isothermal process from 20 bar and 250 °C to pressure of 30 bar. Calculate the heat flow and stating whether it is supplied or rejected and sketch the process on a T-s diagram. Answer = -135 kJ/kgarrow_forward
- List down three to five situations in which buildings, roads or other structures has been built to make room for thermal expansion of different materials.arrow_forwardCalculate the change in a 5-m long copper wire when its temperature changes by 120 oF. Thecoefficient of thermal expansion for copper is approximately 17 x 10-61/oC. Express your answerin SI units.arrow_forwardA heat pump supplies heat energy to a house at the rate of 140,000 kJ/h when the house is maintained at 25°C. Over a period of one month, the heat pump operates for 100 hours to transfer energy from a heat source outside the house to inside the house. Consider a heat pump receiving heat from two different outside energy sources. In one application the heat pump receives heat from the outside air at 0°C. In a second application the heat pump receives heat from a lake having a water temperature of 10°C. If electricity costs $0.105/kWh, determine the maximum money saved by using the lake water rather than the outside air as the outside energy source.arrow_forward
- 2.5 liters of water at initial temperature of 16?C absorbed 800 calories of heat. Calculate the final temperature.arrow_forwardA spring-loaded piston-cylinder device contains 1.5 kg of carbon dioxide. This system is heated from 200 kPa and 25 °C to 1200 kPa and 300°C. Determine the total heat transfer to and work produced by this system.arrow_forwardWhat is the energy collected from the sun in watts /area as measured in the pyranometer. O a. solar battery O b. irradiance O c. solar inverter o d. voltagearrow_forward
arrow_back_ios
arrow_forward_ios
Recommended textbooks for you
Engineering Fundamentals: An Introduction to Engi...Civil EngineeringISBN:9781305084766Author:Saeed MoaveniPublisher:Cengage Learning
Engineering Fundamentals: An Introduction to Engi...
Civil Engineering
ISBN:9781305084766
Author:Saeed Moaveni
Publisher:Cengage Learning