# How to Calculate Refrigerant Amounts

Save

Heat pumps transfer energy by forcing a refrigerant through differing pressures. The refrigerant absorbs latent heat of vaporization when it evaporates and releases it elsewhere when it liquefies. Each refrigerant has its own heat transfer rate, a value that describes how much heat it absorbs per unit weight. Specifications typically state this value using the standard scientific unit of kilojoules per kilogram (kj/kg). Simple conversions apply this transfer rate to construction and manufacturing measurements.

• Multiply your heat transfer requirement, measured in British Thermal Units, by 1.055 to convert it to kilojoules. If you must move, for instance, 250,000 BTUs in a given amount of time: 250,000 x 1.055 = 263,750 kj.

• Divide this amount of heat by the refrigerant's heat transfer rate. If the refrigerant moves, for instance, 170 kj/kg, then: 263,750 / 170 = 1,551 kg.

• Multiply this weight by 2.2 to convert it to pounds: 1,551 x 2.2 = 3,412 lb.

• Divide this weight by the number of cycles the system will go through during the time period. If if will cycle the refrigerant, for instance, 20 times: 3,412 / 20 = approximately 170 pounds. The system therefore needs 170 pounds of refrigerant.

## References

• Photo Credit Chris Ware/Valueline/Getty Images
Promoted By Zergnet

### You May Also Like

The agent R22 (chlorodifluoromethane) has been our main resource as a coolant for many years now. However, due to several environmental concerns...

• How to Add Oil to an AC Compressor

Adding oil to an air conditioning compressor must be done with the air conditioning system evacuated by a recovery machine, since it...

• How to Calculate HVAC Tonnage

A truly accurate calculation for AC tonnage is very complex. Fortunately, there is an easy way for homeowners to arrive at a...

• How to Calculate Chiller Efficiency

Cold water chillers see widespread application both in industry, commerce and architectural air conditioning. While they are used in predominantly larger venues,...

• How to Calculate Refrigerant Capacity

A heat pump transfers energy by moving a refrigerant, which alternately absorbs and releases heat.This process cools fridges, freezers and entire rooms...

• How is Freon Measured?

Freon works as the refrigerant in air conditioning systems. Because the chemical is under pressure, the typical way of measuring the amount...

• Toyota AC Pressure Specs

Your Toyota's air conditioning system is linked with a variety of components, hoses and fittings that circulate and pressurize refrigerant. All of...

• R-134A Refrigerant Specifications

R134a refrigerant, is a replacement for the chlorofluorocarbon R12 refrigerant which has been implicated in the depletion of the Earth's protective ozone...

• How Much Freon Does My Car Need?

According to the Environmental Protection Agency, Freon isn't available in the United States anymore because of its adverse effects on the environment....

## Related Searches

Check It Out

### 3 Day-to-Night Outfits for the Work Week

M
Is DIY in your DNA? Become part of our maker community.