The GPM formula is GPM = Air side Btu ÷ (measured water Δt x 500).
What is the formula for GPM?
The formula to find GPM is 60 divided by the seconds it takes to fill a one-gallon container (60 / seconds = GPM). Example: The one-gallon container fills in 5 seconds, breakdown: 60 divided by 5 equals 12 gallons per minute.
How many BTUs are in a gallon of water?
8.33 BTU
A British Thermal Unit (BTU) is a measurement of heat energy. 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 volume from BTU?
The British Thermal Unit (BTU) is the amount of energy needed to heat a single pound of water by 1°F….Calculating the BTU for your room.
| Room | Multiplication Factor |
|---|---|
| Bedrooms | Multiply Cubic Feet by 4 |
| Common Areas and Kitchens | Multiply Cubic Feet by 3 |
| For Rooms Facing North | Add 15% |
| For French Windows | Add 20% |
How many GPM are in a BTU?
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. 1″ Pipe = 7.5 GPM = 75,000 BTU/hr. 1-1/4″ Pipe = 12 GPM = 120,000 BTU/hr.
What is a BTU calculation?
A BTU – or British Thermal Unit – is an approximation of the amount of energy required to heat 1lb (one pound) of water from 39°F to 40°F, and is roughly equal to 1.055 KJoules. Simplified, a single BTU is more or less equal to the amount of heat and/or energy produced by burning a single wooden match from end-to-end.
How many BTUs Do I need to boil 5 gallons of water?
How many BTUs Do I need to boil 5 gallons of water? There are 8.35*5=41.75 lbs in 5 gallons. To take water from 75 to 212 therefore requires: (212-75)*41.75=5720 BTU.
How many BTUs does it take to raise air 1 degree?
It takes 0.24 BTU of heat to change the temperature of one pound of air by one degree F.
How to calculate BTU for a GPM water test?
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. BTU Calculator for Weighed Water Test GPM
Do you need to convert GPM to BTU / lb?
I presume the 500 is the “nominal” value used by the HVAC industry for simplification. That doesn’t make sense. Enthalphy has units of BTU/lb (or whatever system of units you want to use). If q is gpm, then you need a conversion factor in there to convert to a mass flow like lb/hr. There’s not need for the dT term.
How to calculate the BTU of the 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. BTU Calculator for Weighed Water Test. GPM. Water Flow Rate In Gallons Per Minute. °F. Inlet Water Temperature To Process.
How to calculate BTU for a cooling tower?
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. Download the free Formula Cards (at right) for more information.
