Heatless Adsorption Dryer

Heatless adsorption air dryer for industrial compressed air treatment

Heatless desiccant air dryer tower and piping detail

Twin-tower heatless adsorption drying: One tower dries compressed air while the other regenerates with a portion of dried product air, allowing continuous operation.

Current catalog range: SMC models are listed from 3.8 to 100 Nm³/min, with 0.6–1.0 MPa working pressure, inlet oil content ≤0.1 mg/m³ and a standard listed pressure-dew-point range of -20°C to -40°C.

Regeneration-air demand: The current catalog lists approximately 14%–20% regeneration gas under its stated conditions. Actual operating cost depends on flow, pressure, duty cycle and compressed-air value.

Desiccant protection: Correct upstream separation and filtration are important because liquid water and oil contamination can reduce adsorption performance and desiccant life.

Final sizing should use actual flow, inlet pressure, inlet temperature, operating schedule and the required pressure dew point. Requirements below the standard catalog range should be confirmed with engineering rather than assumed.

+86 180 5167 0936

Product Specifications

Model Specifications

The following 14 models are listed in the SMC heatless adsorption dryer catalog. Capacity is stated in Nm³/min; confirm the reference conditions and capacity at your actual inlet pressure and temperature.

Scroll horizontally on smaller screens to see all columns.

SMC series catalog model specifications
Model	Capacity (Nm³/min)	Power Supply	Listed Power (kW)	Weight (kg)	Connection	L × W × H (mm)
SMC038	3.8	220V / 50Hz / 1PH	0.15	335	DN25	868 × 740 × 1492
SMC065	6.5	220V / 50Hz / 1PH	0.15	425	DN40	868 × 740 × 1842
SMC085	8.5	220V / 50Hz / 1PH	0.15	475	DN40	1018 × 678 × 1892
SMC115	11.5	220V / 50Hz / 1PH	0.15	600	DN50	1351 × 697 × 2050
SMC135	13.5	220V / 50Hz / 1PH	0.15	624	DN50	1351 × 697 × 2050
SMC180	18.0	220V / 50Hz / 1PH	0.15	645	DN65	1351 × 697 × 2265
SMC220	22.0	220V / 50Hz / 1PH	0.15	685	DN65	1351 × 697 × 2273
SMC250	25.0	220V / 50Hz / 1PH	0.15	860	DN80	1402 × 833 × 2372
SMC320	32.0	220V / 50Hz / 1PH	0.15	1075	DN80	1520 × 838 × 2500
SMC450	45.0	220V / 50Hz / 1PH	0.15	1285	DN100	1885 × 866 × 2580
SMC550	55.0	220V / 50Hz / 1PH	0.15	1825	DN100	2000 × 1105 × 2620
SMC650	65.0	220V / 50Hz / 1PH	0.15	2055	DN100	2000 × 1105 × 2620
SMC850	85.0	220V / 50Hz / 1PH	0.15	3350	DN125	2540 × 1533 × 2945
SMC1000	100.0	220V / 50Hz / 1PH	0.15	3650	DN150	2540 × 1533 × 2985

Energy-use note: the listed 0.15 kW electrical power does not include the compressor energy used to produce regeneration air. Heatless regeneration still consumes compressed air.

Catalog Operating Conditions

Working pressure: 0.6–1.0 MPa.
Inlet temperature: 0–45°C.
Outlet pressure dew point: −20°C to −40°C under the specified configuration and operating conditions.
Regeneration air: catalog range approximately 14%–20%; confirm the actual purge requirement for the selected model.
Inlet oil content: less than 0.1 mg/m³.
Desiccant: activated alumina.
Operating cycle: 10–20 minutes.

How Heatless Regeneration Works

One tower adsorbs moisture while a portion of dried compressed air regenerates the other tower at reduced pressure. The towers alternate to maintain the air supply. No external regeneration heater is required.

Allow for Regeneration Air

Size the compressed-air supply for both the downstream requirement and the dryer’s regeneration demand. Tell us whether your stated flow is compressor delivery or the usable flow needed after the dryer.

Provide inlet pressure, highest inlet temperature, required pressure dew point and the upstream filter arrangement. Separation and filtration help protect the desiccant from liquid water and oil.