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Forums > Solar Thermal > How much does heat cost?     > 1 < Author Message Eric ServerOp     Location: United States Occupation: 2003-10-15 16:20 GMT - #64       http://ww2.green-trust.org:8383/2003/heatcost.htm 1 KWH = 3412 BTUs This is very simple stuff but the manufacturers of heating units and air conditioners express values of energy in BTUs per Hour rather than in KWHs per Hour. This is a rate of energy consumption and seems to be designed to confuse most people. A 10,000 BTU room air conditioner removes 10,000 BTUs per hour from the room and a 50,000 BTU heater puts 50,000 BTUs per hour into the room. There should be no confusion … if you have your calculator in your pocket. ------------------------------------------------------------------------------ 100 cubic feet (1 CCF or Therm) of natural gas has about 103100 Btu One gallon of kerosene has about 134000 Btu One gallon of propane has about 91600 Btu how much do you pay for a therm (CCF) of natural gas? -- Steve Spence www.green-trust.org ---------------------------------------- Re: Natural gas, look for the cost/therm on your utility bill (if you have gas service). For my area of NY, it has run between $0.50 and $0.77 a therm. Now all you need to know is that one 'therm' is 100 000 BTU's :-) 100 000 BTU's/therm * 1kWhr/3413 BTU's = 29.3 kWhr/therm So.... In a modern, condensing furnace (say 95% efficient), we have.... $0.65 /therm / 29.3kWhr/therm / 0.95 = $0.0234/kWhr of heat delivered (not counting the electricity to actually operate the furnace). daestrom ------------------------------------------------- just plug in the btu of natural gas, and your cost per therm. the formulas are there.   nafewh Users     Location: China Occupation: 2006-10-30 02:28 GMT - #406       Shandong Tiafe Solar Product Co., Ltd is a factory specializing in manufacturing and exporting solar water heater, solar lights, solar collector, Split system to overseas in Shandong Province of China. We engaged in the development, production and application of the solar energy products and the solar energy industry. We supplies solar water heater parts and whole System to individual, commercial, industrial domestic and international users.   we supply solar water heater, solar collector of both glass tube and heat pipe tube with good efficiency and competitive price. nafewh Users     Location: China Occupation: 2006-10-30 02:28 GMT - #407       www.tiafesolar.com   we supply solar water heater, solar collector of both glass tube and heat pipe tube with good efficiency and competitive price. > 1 <   HomeForums---------1. Public > New Crystalline Technology1. Public > New Thin-Film Technology1. Public > New Module and System Configu...1. Public > Optics and Concentration1. Public > New Electronics1. Public > Energy Storage1. Public > LIVE Data, and Totals1. Public > Data Logging Tools1. Public > Software1. Public > Solar Environmental Impacts1. Public > Solar Architecture1. Public > Solar Thermal1. Public > Economic Impacts1. Public > Electrical1. Public > Lighting1. Public > Dishwashers1. Public > Refrigerators1. Public > Washing Machines

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