In the United States, energy for household heating is generally sold using English units, e.g., therm, gal, and cord. A house in Wisconsin uses 1200 therms of thermal energy during the heating season. Calculate the cost of fuel if the furnace uses (a) natural gas with an efficiency of 70%; (b) No. 2 fuel oil, efficiency 65%; (c) kerosene, efficiency 99.9% (unvented); and (d) wood with l5% moisture with an efficiency of 50%. Use the data in Tables 2.2, 2.7, and 2.13. The efficiencies are based on the HHV. Assume the cost of natural gas is $8/MBtu, the cost of No. 2 fuel oil is $3/gal, the cost of kerosene is $3.50/gal, and the cost of wood is $100/cord. Assume the bulk density of cord wood is 30 lbm/ft3 . TABLE 2.7Typical Properties of Fuel OilsFuel Grade No.PropertyColorSpecific gravity at 16°CKinematic viscosity at 38°C (m²/s)Pour point (°C)Flash point (°C)Autoignition temp. (°C)Carbon (wt%)Carbon residue (wt%)Hydrogen (wt%)Oxygen (wt%)Ash (wt%)HHV (MJ/kg)Fuel TypeProximate analysis, wt%Volatile matterFixed carbonUltimate analysis, wt%HydrogenCarbonSulfurNitrogenOxygenHHV(Btu/lb)(MJ/kg)8119Wood6500.10.1441KeroseneClear0.825870020.21.6 x 10-6<-173823086.5Trace13.20.0146.265356550.42Peat Lignite0.638DistillateAmber0.8652.6 x 10-6<-183826086.4Trace12.70.04950022.1<0.0145.4TABLE 2.13Representative Proximate Analysis, Ultimate Analysis, and Heating Valueof Solid Fuels (Dry, Ash-free)55455111568410,70024.9VeryLightResidualBlack0.92815 x 10-6-235526386.12.511.90.270.0243.840605822378135LightResidualBituminousCoal14,00032.5Black0.95350 x 10-6-155-85.55.011.70.30.0343.2ResidualBlack0.986360 x 10-61966640885.712.010.50.38-0.640.0442.4Refuse-DerivedFuel85157520.30.740970022.5TABLE 2.2Typical Heating Value of Some Gaseous FuelsFuelHHVHydrogen (H₂)Carbon monoxide (CO)Methane (CH₂)Ethane (C₂H₂)Propane (C₂H₂)Butane (C₂H₁0)Ethylene (C₂H₂)Acetylene (C₂H₂)Propylene (C₂H₂)Natural gas (typical)Coal producer gas (typical)Wood producer gas (typical)At 1 atm, 25°C(MJ/m³) MJ/kg (MJ/m³) MJ/kg142.211.711.636.463.890.811757.753.284.238.35.24.810.155.551.950.449.550.349.948.953.55.35.1LHV9.9 121.211.610.132.850.058.447.883.646.445.847.248.245.848.34.44.210854.151.478.834.64.34.0

In the United States, energy for household heating is generally sold using English units, e.g., therm, gal, and cord. A house in Wisconsin uses 1200 therms of thermal energy during the heating season. Calculate the cost of fuel if the furnace uses (a) natural gas with an efficiency of 70%; (b) No. 2 fuel oil, efficiency 65%; (c) kerosene, efficiency 99.9% (unvented); and (d) wood with l5% moisture with an efficiency of 50%. Use the data in Tables 2.2, 2.7, and 2.13. The efficiencies are based on the HHV. Assume the cost of natural gas is $8/MBtu, the cost of No. 2 fuel oil is $3/gal, the cost of kerosene is $3.50/gal, and the cost of wood is $100/cord. Assume the bulk density of cord wood is 30 lbm/ft3 .

In the United States, energy for household heating is generally sold using English units, e.g., therm, gal, and cord. A house in Wisconsin uses 1200 therms of thermal energy during the heating season. Calculate the cost of fuel if the furnace uses (a) natural gas with an efficiency of 70%; (b) No. 2 fuel oil, efficiency 65%; (c) kerosene, efficiency 99.9% (unvented); and (d) wood with l5% moisture with an efficiency of 50%. Use the data in Tables 2.2, 2.7, and 2.13. The efficiencies are based on the HHV. Assume the cost of natural gas is $8/MBtu, the cost of No. 2 fuel oil is $3/gal, the cost of kerosene is $3.50/gal, and the cost of wood is $100/cord. Assume the bulk density of cord wood is 30 lbm/ft3 .

Refrigeration and Air Conditioning Technology (MindTap Course List)

8th Edition

ISBN:9781305578296

Author:John Tomczyk, Eugene Silberstein, Bill Whitman, Bill Johnson

Publisher:John Tomczyk, Eugene Silberstein, Bill Whitman, Bill Johnson

Chapter39: Residential Energy Auditing

Section: Chapter Questions

Problem 15RQ: When performing a combustion efficiency test, digital flue gas will measure what four...

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