Sustainable Energy, SI Edition
2nd Edition
ISBN: 9781337672092
Author: DUNLAP, Richard A.
Publisher: Cengage Learning
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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.
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.)
ft³
When 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?
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- For a building located in London, England with annual heating degree-days (dd) of 5634, a heating load (heat loss) of 42,000 kj/h, and a design temperature difference of 35° C (20° C indoor), estimate the annual energy consumption. If the building is heated with a furnace with an efficiency of 98%, how much gas is burned to keep the home at 20° C? State yourassumptions.arrow_forwardThe Energy Efficiency Rating (EER) of an air-conditioning unit is defined asthe ratio of the heat removed in Btu/h divided by the energy used in watts.The EEI (Edison Electric Institute) names an air-conditioning unit as anEnergy Star unit if it has an EER of 13 or greater. A 21⁄2-ton air-conditioningunit uses 2.41 kilowatts (2,410 watts) of energy. One ton is equivalent to12,000 Btu/h. Can this unit be termed an Energy Star unit?arrow_forwardA stove element draws 15 A when connected to a 240-V line. How long does it take to consume 60 kJ .arrow_forward
- Problem 10 A homeowner is trying to decide between a high-efficiency natural gas furnace with an efficiency of 95 percent and a ground-source heat pump with a COP of 3.3. The unit costs of electricity and natural gas are $0.112/kWh and $1.44/therm (1 therm = 105, 500 kJ). Determine which system will have a lower energy cost.arrow_forwardA 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 Unitsarrow_forward
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