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MindTap Engineering for Dunlap's Sustainable Energy, SI Edition, 2nd Edition [Instant Access], 1 term (6 months)
2nd Edition
ISBN: 9781337551755
Author: DUNLAP
Publisher: Cengage Learning US
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Chapter 8, Problem 19P
To determine
Calculate the expected savings in annual heating costs.
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To maintain a dwelling steadily at 68°F on a day when the outside temperature is 40°F, heating must be provided at an average rate of
300 Btu/min.
Determine the electrical power required, in kW, to deliver the heating using:
(a) electrical-resistance heating,
(b) a heat pump whose coefficient of performance is 3.5,
(c) a reversible heat pump operating between hot and cold reservoirs at 68°F and 40°F, respectively.
Part A
Determine the electrical power required, in kW, to deliver the heating using electrical-resistance heating.
W₁ =
i
kW
A classroom that normally contains 40 people is to be air-conditioned with window air-conditioning units of 5-kW cooling capacity. A person at rest may be assumed to dissipate heat at a rate of about 360 kJ/h. There are 10 lightbulbs in the room, each1
with a rating of 100 W. The rate of heat transfer to the classroom through the walls and the windows is estimated to be 15,000 kJ/h. If the room air is to be maintained at a constant temperature of 21°C, determine the number of window air-conditioning units required.
A house is being built. The contractor states that the cost to install electricbaseboard heat will be $2,480. The contractor also states that a forced air,heat pump system will be 21⁄4 times as much. How much will the heat pumpsystem cost?
Chapter 8 Solutions
MindTap Engineering for Dunlap's Sustainable Energy, SI Edition, 2nd Edition [Instant Access], 1 term (6 months)
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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.arrow_forwardQ4. i. Suggest three renewable energy sources for meeting the electricity demand in large buildings. ii. List the advantages and disadvantages of each of them.arrow_forwardcalculate the heat loss through the ceiling, if the R-19 insulation batt is replaced by R-40 fiberglass insulation.arrow_forward
- For 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_forwardList at least three variables (structures) that affect the loss of heating and cooling in the building (house).arrow_forwardIf in-rack sprinklers are installed, would the required density of an ordinary temperature CMDA ceiling sprinkler change between a storage height of 30 ft verses 75 ft? Why or why not?arrow_forward
- The 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_forwardProblem T3 If the shaft power is 82kw and the cost of the electricity is $0.10 kwh; estimate the cost of the electricity for one hour. Answer $8.2arrow_forwardFor 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_forward
- Propane is flowing in a 4-inch schedule 40 steel pipe at the minimum rate for which the flow is turbulent. Calculate the energy loss per 50 feet of pipe. Use Moody's diagram.arrow_forwardA water main is an 18-in-diameter concrete pressure pipe. Calculate the energy loss over a 1-mile length if it carries 7.50 ft/s of water.arrow_forwardThe Energy Efficiency Rating (EER) of an air-conditioning unit is defined asthe ratio of the heat removed in Btu/hr divided by the energy used in watts. Awindow air conditioner is rated at 5,170 Btu. It uses 470 watts of power. Whatis this unit’s EER?arrow_forward
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