How to Calculate Refrigerant Amounts


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.

Related Searches


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


You May Also Like

  • About R22 Refrigeration Gauges

    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

Is DIY in your DNA? Become part of our maker community.
Submit Your Work!