At a dryer inlet temperature of 50 °C, the 2.6 m³/min TPK-20A just covers the workshop demand in this example. Raise the inlet temperature to 60 °C and the 3.8 m³/min TPK-30A becomes the first size that meets the same demand. The hotter inlet air gives the dryer more heat to remove.

Refrigerated air dryer sizing at two inlet temperatures

Suppose a screw-type air compressor supplies an assembly line with a peak demand of 2.4 m³/min, expressed on the same flow basis as the dryer ratings. The room is at 35 °C, the compressed air enters the dryer at 0.59 MPa (5.9 bar), and the process calls for a pressure dew point of +10 °C.

At that pressure, HUADA’s sizing chart gives a pressure correction factor of 0.93. The temperature factor drops from 1.00 to 0.72 as the inlet gets hotter. Divide the peak airflow by the product of the two factors to find the minimum nominal capacity.

The cooler case leaves little spare capacity in the 20A. If the choice is this close, measure the temperature where the air enters the dryer while the tools are drawing peak flow.

Why does dry air leave the dryer warm?

Inside these fixed-frequency refrigerated air dryers, an air-to-air heat exchanger uses the cold outgoing air to precool the incoming stream. The evaporator cools the incoming air further until water vapor condenses. A separator collects the droplets and an automatic drain discharges them. On its way out, the dry air passes back through the exchanger and picks up heat from the inlet stream.

HUADA lists a pressure dew point of +2 to +10 °C, depending on operating conditions. This tells you how far the air can cool at line pressure before water starts to condense again. Air leaving the dryer warm at a +10 °C pressure dew point can still form droplets in a section of pipe where the air cools below +10 °C at the same pressure.

Will the larger model fit the existing line?

The 1.6 m³/min TPK-10A and the 2.6 m³/min TPK-20A both use G1 ports. Moving from the 20A to the 30A changes the connections to G1 1/2 and the listed total unit power from 0.96 to 1.125 kW. All three use a 220 V / 50 Hz supply and R410A refrigerant.

For a selection based on your line, send HUADA your peak airflow, minimum working pressure, highest dryer inlet and room temperatures, and required pressure dew point. Request a dryer sizing check.