Direct-Expansion Refrigerated Air Dryer (SR)

Cooled directly by refrigerant: the SR series

The SR series is a direct-expansion dryer that follows the refrigeration cycle to remove moisture from compressed air as the refrigerant evaporates

(compressor → condenser → expansion valve → evaporator). With a built-in refrigeration unit it is capable of standalone operation without any chilled water infrastructure.

Configuration by capacity

Standard conditions

Dedicated microprocessor controller

GENEQ's controller, developed specifically for refrigerated dryers, monitors operating status continuously and protects the equipment.

• Refrigerant pressure monitoring (transmitter) · refrigerant and air temperature monitoring (NTC)

• RS485 communication and remote operation

• Phase reversal, phase loss, voltage imbalance and overcurrent protection

• Refrigerant high/low pressure, refrigerant high temperature and refrigeration oil level protection

• Pressure dew point 4–10 °C per ISO 8573-1

Energy-saving options

① Stepless capacity control refrigeration compressor

A stepless control type (infinite capacity control screw) applied to large units (10,000 Nm³/h and above). In the low-load range, slide valve control (30–100%) reduces refrigerant circulation and cuts power consumption.

② Condenser — PCM and low-temperature condensate utilization (GENEQ patent)

The cooling water side of the refrigerated dryer condenser uses PCM (phase change material) storage and low-temperature condensate (4–10 °C).

Lowering the refrigerant condensing pressure reduces the power consumption of the refrigeration unit.

③ Expansion device — electronic expansion valve (EEV) (GENEQ patent)

An electronic expansion valve that measures refrigerant pressure and temperature to control the refrigerant supply in real time.

It prevents overcooling under load fluctuations and lowers the condensing pressure, increasing refrigeration capacity.

• Prevents overcooling under load fluctuations

• Lower condensing pressure, higher refrigeration capacity

• 10–30% lower power consumption

④ Evaporator — flooded evaporator

Liquid refrigerant fills the shell side while compressed air flows through the tubes.

A dry evaporator (refrigerant in the tubes, compressed air on the shell side) needs baffles, which increase the pressure drop, whereas

the flooded type gives greater heat transfer and refrigeration effect and a lower refrigerant discharge temperature, reducing power consumption.

Suited to large units (10,000 Nm³/h and above) with wide load fluctuations and long operating hours

• R-134a refrigerant

KGS Registration — Refrigeration Unit and Specified Equipment Manufacturing under the High-Pressure Gas Safety Control Act

SR series direct-expansion refrigerated air dryers are built at the GENEQ Gimhae plant, which holds manufacturing registrations for refrigeration units (packaged water-cooled and air-cooled) and refrigeration specified equipment (condensers, evaporators and pressure vessels) under Korea's High-Pressure Gas Safety Control Act (registered 17 February 2025). This is what the Korean market commonly calls "KGS certification": equipment subject to inspection by the Korea Gas Safety Corporation (KGS), designed and built by a registered manufacturer.

Because we build the refrigeration unit and the pressure vessels in-house rather than outsourcing them, KGS inspection, delivery and after-sales service and parts are handled by one company. The original certificates are on our Certifications page.

Sales inquiries

We propose the right combination of options for your capacity and load pattern. After installation and commissioning, GENEQ remains responsible for maintenance and parts supply.