Integrated Dry Cooler For High And Low Temperatures in Internal Combustion Engines

Integrated Dry Cooler for High and Low Temperatures in Internal Combustion Engines

High-Temperature Circuit: Refers to two independent cooling circuits:

High-Temperature Circuit: Cools the engine block (cylinder liners, cylinder heads, etc.), with water temperature typically maintained between 85°C - 95°C (controlled by the thermostat), or even higher.

Low-Temperature Circuit: Cools the supercharged intake air (intercooler) and the Exhaust Gas Recirculation (EGR) system, with water temperatures typically maintained between 40°C and 70°C. Low-temperature cooling is highly sensitive to intake air temperature, directly impacting engine efficiency and emissions.

The interior of an integrated dry cooler is typically constructed from multiple independent "water chambers" stacked with complex "heat dissipation fins."

High-Temperature Zone: Hot coolant exiting the engine enters the high-temperature water chamber of the dry cooler. It flows through air-washed cooling fins, where heat is dissipated by the air. The cooled high-temperature coolant is then pumped back to the engine.

Low-Temperature Zone: Low-temperature coolant (or charge air requiring cooling) flows through the low-temperature water chamber and cooling fins, also being cooled by air.

Shared Airflow Path: One or a set of high-power fans simultaneously supply cooling air to both high- and low-temperature zones. Air first flows through the low-temperature zone before passing through the high-temperature zone, creating "temperature gradient" cooling to enhance efficiency.

Operational Flow:

During engine operation, the high-temperature and low-temperature circuits circulate independently.

Cooling fans automatically adjust their speed based on signals such as engine coolant temperature and intake air temperature.

Ambient cool air drawn in by the fan first passes through the low-temperature radiator fins, performing "pre-cooling" on the pressurized air or low-temperature coolant (as the low-temperature section demands higher cooling efficiency).

Subsequently, this preheated air then flows through the high-temperature radiator fins to cool the engine's high-temperature coolant.

Finally, the heated air is expelled from the radiator.