HomeCalculatorsRefrigerant Charge (Tube Volume Method)

Refrigerant Charge (Tube Volume Method)

Estimate refrigerant charge from system pipe + component internal volume and refrigerant density at operating states.

Refrigeration

Liquid-line lengthmLiquid-line internal diametermmSuction-line lengthmSuction-line internal diametermmComponent internal volume (condenser + evap + receiver)LLiquid density at condensing Tkg/m³Vapour density at evaporating Tkg/m³

Liquid-line volume

4.02L

Suction-line volume

15.39L

Estimated charge

25.38kg

Formula, assumptions, and limits

Approximate - assumes the liquid line + condenser + receiver are liquid-filled at condensing density, suction line is vapour-filled at evaporating density. Accurate to ±10 % for most DX plants. For flooded systems add evaporator liquid charge.

Symbol legend

Meaning	Unit	Source
Pipe internal volume (πD²L/4)	m³	geometry
Liquid refrigerant density	kg/m³	P-h chart
Suction vapour density	kg/m³	P-h chart