How to Convert CMH to BTU

Exchangers absorb heat from industrial machinery.
••• Hemera Technologies/ Images

The cubic meters per hour (CMH) of a heat exchanger describes the flow rate of its refrigerant through the system. The exchanger's British Thermal Units (BTUs) describe the amount of energy that it transfers. It moves this energy by pumping the fluid, so these two values are directly proportional. The other factors affecting the amount of heat that the unit moves are the fluid's temperature drop while moving through the exchanger and the length of time during which the exchanger runs.

    Multiply the flow rate, measured in cubic meters per hour, by 4.4 to convert it to gallons per minute. For example, if 100 m^3 of fluid go through the exchanger each hour: 100 × 4.4 = 440.

    Multiply this flow rate by the refrigerant's temperature rise. For example, if fluid enters the exchanger at 59 degrees Fahrenheit and rises to 72 degrees Fahrenheit: 440 × (72 - 59) = 5,720.

    Multiply this result by 500, a conversion factor that takes the fluid's heat absorption rate into account: 5,720 × 500 = 2,860,000. This is the unit's energy transfer rate, measured in BTUs per hour.

    Multiply this rate by the number of hours for which the appliance runs. For example, if you are calculating the heat transferred over the course of half an hour: 2,860,000 × 0.5 = 1,430,000. This is the number of BTUs that the heat exchanger moves.

Related Articles

How to Calculate Heat Transfer
How to Calculate Boiler Heat Input Rate
How to Convert PPH to GPM
How to Calculate Refrigerant Amounts
How Do You Convert HSFP to COP?
How to Calculate Refrigerant Capacity
How to Convert Amps Into BTUs
How to Calculate Joules of Heat
How to Calculate KVA to MVA
How to Convert KWH to KVA
How to Convert Horsepower to Thrust
How to Convert Steam Flow to Megawatts
How to Convert Differential Pressure to Flow
How to Calculate the Mass of a Moving Object
How to Calculate the Minimum Flow Rate of the Cooling...
How to Convert Ounces to Metric
Does Kinetic Energy Increase in a Drink When Ice Melts?
How to Convert mm Hg to in Hg
How to Find the Volume of a Sphere in Terms of Pi
How to Figure GPM Water Flow on an Existing Chiller

Dont Go!

We Have More Great Sciencing Articles!