how many btus must be added to evaporate one pound of water?
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The temperature will remain constant until all the liquid is changed to "vapor". The added heat is absorbed in the process of changing from a liquid to a gaseous state. This heat is called the "latent heat of vaporization". For water, this is 970 Btu per pound.
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How many cubic feet of natural gas are in 1 British thermal unit? The answer is: 1 BTU equals 0.0010 cu ft N.G.
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Water weighs 8.33 pounds per gallon so we can calculate that one gallon of water requires 8.33 BTU to raise the temperature 1ºF.
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A 1/3-pound burger requires 660 gallons of water. Most of this water is for producing beef (see below). 1 pound of beef requires 1,799 gallons of water, which includes irrigation of the grains and grasses in feed, plus water for drinking and processing.
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A common input is 34,000 BTUs on a 40-gallon tank and 36,000 BTUs on a 50-gallon tank. The higher the BTU input and efficiency, the faster the recovery. Electric water heaters typically have one 5,500-watt or two 4,500-watt elements.
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Multiply your square footage by 20 BTUs to get a general estimate. Typically, plan to purchase a heating or cooling unit with 20 BTUs for every square foot of space you have.
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Basic Radiator Water Volume vs BTU Output Data Cast iron radiators require about 14 liters of hot water per kW of heat output (1 KW or kilowatt = 3,412 BTUs) For North Americans, 1 gallon = 4.546 liters.
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['1 Cubic Foot (ft3, CF) = Approx 1000 BTUs.', '1 CFH = 1 MBH (MBH is thousands of BTUs per hour)']
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5,000 BTU air conditioners are recommended for rooms less than 200 square feet (ideally less than 150 square feet). The wattage of 5,000 BTU air conditioner units averages 446 to 580 watts (most of the units assessed for this average were window units, as 5,000 BTU split units are uncommon).
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1 gallon of milk requires 880 gallons of water, or 54.9 gallons of water for 1 cup. That includes water for raising and grazing cattle, and bottling and processing. 1 pound of cheese requires 600 gallons of water. On average it requires 1.2 gallons of milk to make 1 pound of cheese.
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The rule of thumb is two to four pounds of refrigerant per one ton of your unit. You should always check the specifications of your unit. However, most home air conditioning units are between one ton and five tons.
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What is a BTU? A BTU (British Thermal Unit) describes the amount of energy to raise 1 lb of water 1 degree Fahrenheit in one hour. Water equals 8.3 lbs per gallon. To boil one gallon of water starting 70°F in 1 hour you will need 8.3 x (212-70) = 1,178.6 BTUs.
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You have all heard of the BTU of heat energy (British Thermal Unit), it takes one BTU to raise one pound of water one degree Fahrenheit. So if the water in the pan on the stove is put in at 32°F, it will then require 180 BTU's to bring the water to boiling temperature, or 212°F.
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The number most often cited by plant based advocates is that it takes 2,500 gallons of water to produce a single pound of beef (although I have listened to people argue that number is as high as 12,000 gallons).
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= GPM X 500 X Temp Rise Typical chilled water system design flow rates 2.4 GPM per ton (assuming 10oF difference between entering and leaving temperatures) Evaporation rate of cooling tower condenser water 3 GPM per 100 tons Condenser water flow rate requirement 3 GPM per ton BTU per ton of cooling 12,000 BTU = 1 ton ...
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Take the 180 sq. ft. times 25 BTU per square foot and you get the minimum BTU air conditioner you should buy. That means 180x25=4500 BTU cooling capacity is needed.
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MBH = thousand BTU's per hour. It is a measure of the size of air conditioning system in the traditional Imperial System of measurements. One BTU is the amount of energy necessary to raise the temperature of one pound of water from 60F to 61F. Niel.