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# How do I calculate BTU of water?

## 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 heat capacity for water?

4,184 Joules
Precisely, water has to absorb 4,184 Joules of heat (1 calorie) for the temperature of one kilogram of water to increase 1°C.

What is the CV value of water?

By definition, a Cv value of one is the Cv required to flow one gallon per minute (gpm) of water at 60′ F with a pressure differential of one psi. Flow is proportional to the value of Cv. For example, a Cv of 150 would then equate to 150 gpm of water at 60′ F with a differential pressure of one psi.

How many BTUs can one gallon of water absorb?

1,251 BTUs
The answer then is 1 gallon of water will absorb 1,251 BTUs going from ambient temperature (assumed to be 62o F) to 212o F.

### Does BTU matter 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 BTU does a water heater use?

Input ranges from about 32,000 on a 30-gallon unit to 88,000 on a 100-gallon tank. 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.

What has a higher heat capacity than water?

On a mass basis hydrogen gas has more than three times the specific heat as water under normal laboratory conditions.

How do you calculate how much heat is absorbed by water?

The heat absorbed is calculated by using the specific heat of water and the equation ΔH=cp×m×ΔT. 4. Water is vaporized to steam at 100oC. The heat absorbed is calculated by multiplying the moles of water by the molar heat of vaporization.

#### What is Gamma for water?

A commonly used value is the specific weight of water on Earth at 4 °C (39 °F), which is 9.807 kilonewtons per cubic metre or 62.43 pounds-force per cubic foot. A common symbol for specific weight is γ, the Greek letter Gamma.

#### What is the density of water in LB gal?

8.34 pounds per gallon
There are a few variables, such as temperature, that determine the weight of water, but for all practical purposes in waterworks mathematics, water weighs 8.34 pounds per gallon. The density (mass per unit volume) of water is 1.00.

How many BTU’s can a gallon of water absorb when it is taken from 62 F and turned into steam?

It is the process of vaporization that water exerts its maximum cooling action; one gallon of water will absorb approximately 1,250 BTU’s going from 62 Degrees F to 212 degrees F. When going from 212 boiling water to 212 steam; this gallon will have absorbed an additional 8,080 BTU’s; for a total of 9,330 BTU’s.

How many BTUs does it take to boil a gallon of water?

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.

## What does BTU stand for?

BTU stands for British Thermal Unit, though the term isn’t only used in the United Kingdom. It’s a measurement that’s part of the common system, along with things like pounds, inches and degrees Fahrenheit . You’ll hear about BTUs anywhere these forms of measurement are used, but mostly in the United States.

## How many BTU does it take to heat 1 gallon of water?

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 many BTU to evaporate one gallon of water?

Boiling water evaporation efficiency is based on some basic laws of physics: 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).

How many BTU to raise water temperature?

One BTU is the amount of energy needed to raise the temperature of 1 pound (0.45 kg) of water by 1° Fahrenheit (0.55° Celsius). In other words, if 16 ounces (0.47 l) of water at 59°F (15°C) were poured into a stovetop pan and the gas burner turned on, it would take 1 BTU to raise the temperature of the water to 60°F (15.6°C).