Views: 0 Author: Site Editor Publish Time: 2026-02-09 Origin: Site
The remote radiator for a Jenbacher JGS 420 GS B82/B86 gas engine is a specialized heat exchanger designed to reject the engine’s thermal loads in installations where space, ventilation, or noise constraints limit the use of an engine-mounted radiator. Remote radiators help maintain optimal coolant temperatures and reliable performance in cogeneration (CHP) and power generation applications.
The Jenbacher JGS 420 GS B82/B86 is a Type-4, 20-cylinder V-engine with a spark-ignited gas design producing roughly 1,500 kW electrical power. Technical parameters indicate:
Configuration: V20, 4-stroke gas engine
Displacement: 61.10 L
Nominal Speed: ~1,800 rpm (B82 variant)
Thermal Energy Balance: Includes heat from intercooler, lube oil, and jacket water circuits.
Jacket Water Heat: ~394 kW
Intercooler Heat: ~340 kW
Lube Oil Heat: ~168 kW
Surface & Balance Heat: ~70 kW / 36 kW
Typical Exhaust Temperatures: ~465 °C at full load.
These values define the total heat rejection requirement that the cooling system—including a remote radiator—must manage.
Remote radiators are used for gas engines like the Jenbacher 420 series to:
Improve cooling efficiency by situating heat rejection where natural airflow is available.
Reduce ambient noise near the engine module by keeping fan noise away from occupied areas.
Facilitate maintenance — radiator cleaning or replacement can be done without interfering with engine access.
Enable flexible installation in constrained environments (e.g., containerized gensets, enclosed buildings).
A remote radiator functions as a dry cooler-style heat exchanger. Coolant circulates between the engine and the radiator through piping:
Hot coolant from the engine cooling circuits (jacket water, lube oil loop, possibly charge-air cooler loop) is pumped to the remote unit.
Air flows over finned tubes, rejecting heat to the atmosphere.
Cooled coolant returns to the engine’s cooling system.
Fans (typically axial or centrifugal) may be used to ensure adequate airflow, especially under low ambient wind conditions.
While specific remote radiator capacity must be engineered per site, a Jenbacher 420 class radiator must handle a sum of high-temperature circuits (jacket water, intercooler, oil coolers) often exceeding 900 kW total heat load under full engine output. Estimated breakdown for designing a remote radiator might be:
Jacket Water Loop: ~400 kW
Intercooler Loop: ~340 kW
Lube Oil Heat: ~170 kW
This results in a design radiator capacity on the order of 900 kW or higher (allowing safety factor and worst-case conditions).
Typical Remote Radiator Features Include:
Finned-tube arrays sized for high external airflow and minimal clogging.
Axial fan sets with variable speed control for thermal load adaptation.
Modular design for ease of transport/installation.
Vibration-isolated mounts to reduce structural fatigue.
Outdoor-rated coatings or corrosion protection for long service life in varied environments.
In Jenbacher engines, the high-temperature circuits (jacket water + oil) and low-temperature circuits (intercooler) can be combined or cooled via separate remote radiator stages:
High-Temperature Radiator: Cools jacket water and oil loop.
Low-Temperature Radiator: Dedicated intercooler heat rejection if required for turbocharging and air charge cooling.
These systems typically interface through glycol or coolant loops with expansion tanks, thermostats, and pumps that control flow rates based on temperature demand.
When specifying a remote radiator for a Jenbacher JGS 420 GS B82/B86, evaluate the following:
a) Heat Rejection Capacity
Must exceed combined heat loads from all circuits plus safety margins.
Often expressed in kW at a given ΔT (temperature difference between coolant and ambient).
b) Coolant Flow Rate
Dictates tube sizing and pump specification.
Typically chosen to maintain ~2–4 °C temperature drop across the radiator under full load.
c) Ambient Conditions
High ambient temperatures (e.g., >35 °C) mandate derating and larger surface areas.
Radiator design must consider worst-case summer peak temperatures.
d) Integration with Engine Controls
Fan speed and radiator performance may be tied to engine control systems to optimize efficiency.
e) Structural & Installation Specs
Foundation load, vibration isolation, and piping runs affect design and layout.
A remote radiator for a Jenbacher JGS 420 GS B82/B86 gas engine is engineered to satisfy the robust cooling needs of a ~1.5 MW class gas engine set by rejecting heat from multiple circuits (jacket water, intercooler, oil). By externalizing the heat exchange medium, remote radiators help improve operational efficiency, reduce noise near the genset, and offer flexible installation layouts—critical in industrial installations with limited space or strict environmental constraints.
