RKS – RKL Table-Type Gas Coolers

Maximum heat dissipation efficiency in transcritical CO2 systems.

A reliable solution to optimize high-pressure performance

In transcritical CO2 systems, the gas cooler is the first component to reflect the challenges of hot ambient days: head pressure spikes rapidly, fans are forced to operate at increasingly higher speeds, and system regulation struggles to maintain stability. In compact layouts where space is restricted, operating noise also becomes a major operational constraint.

When heat dissipation is insufficient, high-pressure alarms become more frequent, compressor power consumption increases, and the system loses efficiency precisely when it must guarantee continuity and reliability. This leads to more stressful operating cycles, frequent corrective maintenance interventions, and narrower operating margins.

The RKS and RKL gas cooler series are engineered to tackle these real-world scenarios: high-efficiency heat exchangers made with K65 copper tubes that deliver high performance even at low fan speeds, a structure rated for operating pressures up to 120 bar, and two frame variants (short frame or long frame) to achieve the exact compromise needed between performance, compactness, efficiency, and quiet operation.

Application Sectors

Food & Beverage
Grocery Retail

Advantages of Gas Coolers

High-pressure optimization: Thanks to the highly efficient heat transfer of the coil, featuring inner-grooved K65 copper tubes and aluminum fins, which ensures proper heat dissipation even under high loads, resulting in improved transcritical cycle efficiency.
Guaranteed structural reliability: Thanks to the dedicated tube suspension system that avoids direct contact with the casing frame, mitigating vibrations and extending the heat exchanger’s operating life during continuous cycles.
Reduced operating noise: Achieved via ErP-compliant external rotor axial fans, dynamically and statically balanced, with diameters ranging from 500 to 910 mm and sound pressure levels starting from 28 dB(A) at 10 m—ideal for installations near noise-sensitive areas.
High-pressure resistance: Assured by the K65 copper alloy circuit and stainless steel headers, rated to operate up to PS 120 bar and TS –40 / +120 °C, ensuring durability and safety even under the most severe summer conditions.
Uninterrupted airflow: Thanks to optimized fan shrouds that prevent air recirculation and improve airflow passage through the coil core, positively impacting heat transfer capacity and operational stability.
System adaptability: Supporting both horizontal and vertical installation, two frame options (RKS short, RKL long), and 196 total models, allowing for accurate configuration based on required capacity, allowable noise limits, and available space.

Technical Specifications and Models

Disposal power: 20 – 510 kW
Fans: 1–5 units (RKS) / 1–4 units (RKL), diameters 500 / 630 / 800 / 910 mm, AC or EC, IP54, class F
Fin spacing: 2,1/2,3/2,5/3,0/4,0 mm
Refrigerant fluid: transcritical CO₂
Operating pressures and temperatures: PS 120 bar | TS –40 / +140 °C
Installation: horizontal or vertical
Number of models: 196 total configurations

Options and Customization

AISI 304 / 316L stainless steel casing
Copper fins, stainless steel, pre-painted aluminum fins or flat fins for easy cleaning
High efficiency EC fans
ATEX fans or special fans for high residual head
Specially painted casing
Vertical airflow installation kit
Anti-vibration mounts
“Spray System” adiabatic cooling kit
Coil protective coating
Fan isolation switches (disconnectors)
AC/EC Fan wiring
Coil intake filter

Technical features

Warranty: 24 months from date of shipment
Compliant with :
- PED 2014/68/EU
- Machinery Directive 2006/42/EC
- Low Voltage Directive 2014/35/EU
- EMC Directive 2014/30/EU