How do I calculate BTU of water?
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How do I calculate BTU of water?
BTU = Flow Rate In GPM (of water) x (Temperature Leaving Process – Temperature Entering Process) x 500.4*Formula changes with fluids others than straight water.
What is the BTU formula?
You may be familiar with the formula BTUH = CFM x ΔT x 1.08. This same formula is often rearranged to use for determining airflow by measuring the heat input and temperature rise.
How much water is in a BTU?
One BTU is the amount of heat energy required to raise one pound of water by 1ºF. 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.
How do you calculate heat energy of water?
Calculate the kilowatt-hours (kWh) required to heat the water using the following formula: Pt = (4.2 × L × T ) ÷ 3600. Pt is the power used to heat the water, in kWh. L is the number of liters of water that is being heated and T is the difference in temperature from what you started with, listed in degrees Celsius.
How many GPM are in a BTU?
Apply the calculation GPM = Air Btu ÷ (Δt x 500). Remember to complete the calculation in parenthesis first. Divide the Airside Delivered Btu of 50,000 by 15,550 to find 3.2 gpm through the coil.
What is BTU in water heater?
The BTU rating on a water heater indicates the number of pounds of water that that water heater can heated by 1 °F in 1 hour. For instance, the left panel in the image above is from a 40-gallon gas water heater rated 34,000 BTUs. This means that this water heater will heat 34,000 lbs.
How many BTU does it take to evaporate a gallon of water?
8,092 BTUs
It takes 8,092 BTUs to evaporate one gallon of water. Natural gas has a heating value of 1,000 BTUs per cubic foot (1 Therm = 100,000 BTUs).
Where can I find BTU on water heater?
The BTU input can be found on the manufacture’s ID plate on the side of the water heater. The ID plate is not the big yellow sticker that shows the energy efficiency, but is a smaller plate that shows the gallons, serial number and BTUs.
Is BTU important for water heaters?
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. Two lower-kilowatt elements will heat much faster than one higher-wattage element.
How many Btus are in a lb of water?
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.
How many Btus does it take to condense water?
When one pound of water boils or evaporates, it absorbs 970 BTU’s at a constant temperature of 212° F. (at sea level) and to condense one pound of steam to water 970 BTU’s must be extracted from it.
How many BTUs does it take to heat 1 degree of water?
The specific heat of water is 1 or it takes 1 BTU to raise water 1 degree Fahrenheit.
What is the BTU temperature?
A British thermal unit (Btu) is a measure of the heat content of fuels or energy sources. It is the quantity of heat required to raise the temperature of one pound of liquid water by 1 degree Fahrenheit at the temperature that water has its greatest density (approximately 39 degrees Fahrenheit).
How long does it take to heat 1 Litre of water?
One minute per litre, as a minimum for a modest temperature rise, so at least 210 minutes. One and a half minutes per litre to get really hot if starting very cold, so up to 315 minutes.
What does BTU mean for hot water tank?
The British thermal unit, or BTU, is a unit of energy, one that is used to quantify the heating and cooling power of, water heaters, air conditioners and similar equipment.
