Refrigerated dryers RDX

Maximum efficiency for your compressed air: Refrigerated dryers from Comprag GmbH

Clean and dry compressed air is not just a requirement, but the foundation for trouble-free production processes and the longevity of your equipment. Moisture in compressed air inevitably leads to corrosion, scrap, and costly maintenance.

Therefore, trust the RDX series - the highly efficient refrigerated dryers from Comprag GmbH that bring your compressed air to the (dew) point.

Constant low dew point for efficient moisture removal even in the case of variable compressed air flow conditions.

Comprag refrigerated dryers: Reliability and maximum energy efficiency

As a specialist in compressed air treatment, Comprag GmbH knows what matters: minimal operating costs with maximum performance. Our RDX series refrigerated dryers are designed to perfectly achieve this balance.

This is what you can expect from every Comprag refrigerated dryer:

• Maximum separation efficiency: Thanks to the integrated coalescing condensate separator Our refrigerated dryers reliably remove up to 98% of moisture . Even with variable compressed air consumption, the robust design from Comprag GmbH guarantees maximum operational reliability.
• Minimal pressure loss, maximum savings: The efficient aluminum heat exchangers, combined with excellent thermal insulation, ensure low pressure loss. The result: Your compressors consume less energy - a clear cost advantage offered by Comprag GmbH .
• Precise control: The control system flexibly adjusts the cooling output to changing load conditions. Together with the clear dew point indicator, you maintain control over the quality of your compressed air at all times.

Environmentally conscious design: Every refrigerated dryer from Comprag GmbH uses state-of-the-art refrigerants, underlining our responsibility for the environment.

Applications: Why industry professionals trust Comprag refrigerated dryers

Comprag GmbH has developed the RDX series refrigerated dryers to meet the most stringent requirements of various key industries. Your investment in a Comprag refrigerated dryer protects your entire value chain.

• Medical & Pharmaceutical: Our refrigerated dryers ensure the necessary low dew point for sensitive processes such as sterilization and packaging applications.
• Food & Beverages: Strict hygiene and quality standards are adhered to during bottling - moisture is reliably excluded.
• Painting systems & surface technology: Elimination of the smallest water particles that could lead to painting defects, for flawless results.
• Mechanical engineering & workshop: Extending the service life of your pneumatic tools and control components through corrosion protection.

Technical details of the Comprag RDX series refrigerated dryers

The performance of a refrigerated dryer is measured by its efficiency and consistency. Comprag GmbH uses proven and innovative components in its RDX series to guarantee you top technical performance.

The heart of efficiency: The combined heat exchanger

Combined 3-in-1 heat exchanger

The combined heat exchanger in an RDX refrigerated dryer consists of three functional units: an air/air heat exchanger, an air/refrigerant heat exchanger and a coalescence separator.

The air/air heat exchanger pre-cools hot compressed air. This saves up to 50% in energy in the subsequent refrigerant cooling process. At the same time, cold dry air leaving the dryer is heated to a suitable temperature for subsequent use. The air/refrigerant heat exchanger brings the temperature of the compressed air to dew point. The coalescence separator removes condensate from the compressed air. The separated condensate is periodically discharged by the condensate drain valve.

Comprag GmbH guarantees the energy efficiency of its RDX series through an advanced combined heat exchanger consisting of three functional units - the central argument for our refrigerated dryers :

1. Air-to-air heat exchanger (the energy saver): Pre-cools the incoming warm compressed air by utilizing the already cooled exhaust air. This saves up to 50% energy in the downstream refrigerant cooling process.
2. Air/refrigerant heat exchanger: Cools the air precisely to the dew point of +3 °C, ensuring reliable condensation of the water.
3. Coalescence separator ( demister ): Separates condensate and fine oil particles from compressed air. The separated condensate is removed periodically and with minimal loss.

The integrated design ensures minimal pressure loss and maximum reliability.

The refrigeration cycle: How your Comprag refrigerated dryer works in detail

Refrigerated dryers RDX-04 to RDX-77 Functional block diagram

Refrigerated dryers RDX-100 to RDX-360 Functional block diagram

The reliable drying of compressed air in Comprag GmbH 's refrigerated dryers is based on a highly efficient, continuous refrigeration cycle. This principle has been perfected in the RDX models to keep the pressure dew point consistently above +3 °C, thus preventing icing.

The main components and their interaction:

• Refrigerant compressor (1): It compresses the gaseous refrigerant.
• Condenser (3): Here the compressed gas is cooled, causing most of the refrigerant to transition into the liquid phase.
• Filter dryer (5): The liquefied refrigerant is cleaned to protect components.
• Expansion valve (4): It regulates the flow and injects the refrigerant into the evaporator. Important: This valve keeps the pressure in the evaporator constant, which, in combination with the regulated refrigeration circuit, prevents the pressure dew point from dropping below +3 °C (protection against icing).
• Evaporator (2): Here, the refrigerant absorbs the heat from the compressed air and transitions into a gaseous state. This is the moment when the moisture from the compressed air condenses.

This precise cycle, controlled by components such as the expansion valve and supplemented by time-controlled condensate drains ( 6 ), guarantees that your Comprag refrigerated dryer delivers maximum performance with minimal risk - regardless of whether you are using a compact model (RDX-04) or an industrial system (RDX-360).

The correct design: How to find the ideal Comprag refrigerated dryer

The efficiency of your Comprag RDX series refrigerated dryer depends directly on correct sizing. We ensure that your dryer reliably achieves the pressure dew point of 3°C, even under real-world, non-standard conditions.

The volume flow rate is based on an operating pressure of 7 bar, an air inlet temperature of 35°C and an ambient temperature of 25°C according to DIN ISO 7183. Deviations from these values require the application of correction coefficients.

The Comprag formula for process safety:

To calculate the actual required volume flow rate of the refrigerated dryer, multiply the volume flow rate of your compressor by the following correction coefficients (F1; F2; F3):

Air volume flow compressor x F1 x F2 x F3 = dryer air volume flow

F1 (Operating pressure): Takes into account the actual working pressure.

F2 (Compressed air inlet): The most critical factor, which takes into account the temperature of the air entering the refrigerated dryer.

F3 (Environment): Takes into account the ambient temperature at the installation site.

Practical example from Comprag GmbH

Assuming your compressor delivers 1.6 m³/min at a working pressure of 4 bar, an air inlet temperature of 45°C and an ambient temperature of 35°C:

Air volume flow = 1.6 x 1.25 x 1.39 x 1.14 = 3.169 m³/min

In this case, you will need a Comprag refrigerated dryer that can process a volume flow of at least 3.17 m³/min - a significantly larger model than the compressor power alone would suggest.

Get advice - we'll secure your investment

To avoid miscalculations and thus insufficient drying performance, Comprag GmbH recommends that you utilize our expertise. Contact us. Our specialists will calculate precisely which Comprag refrigerated dryer you need based on your specific operating conditions to guarantee maximum efficiency and reliability.

Contact us - for a perfectly sized and therefore maximally efficient drying solution!

Your partner for dry compressed air: Comprag GmbH

From small workshops to large industrial plants: An RDX series refrigerated dryer is the ideal solution for completely drying your compressed air. Comprag GmbH stands for quality, robustness, and performance that has proven itself over many years.

Ensure a longer service life for your tools and consistently high product quality. With a refrigerated dryer from Comprag GmbH, you're making the right choice.