What Are The HT And LT Cooling Systems?

What are the HT and LT cooling systems?

LT/HT main engine cooling system

Engines built for use on ships are subjected to harsh operating conditions, necessitating the installation of sufficient cooling systems. Two circuits within a vessel cool the main engines.
• LT (Low temperature) Fresh water is used to cool the main engine.
• HT (High temperature) Sea water is used in the LT circuit to cool water via a heat exchanger.

The control system is made up of pump and valve units. Data from specialized temperature sensors is used to power the system. PLC collects and analyzes data. The PLC contains appropriate temperature controllers. In order to maintain the specified temperature, the PLC operates the appropriate pumps and valves. The visualization operator station displays all system parameters, allowing remote operation as well as monitoring system components and all system parameters.

Sea water cannot be used in engines because it would necessitate the use of more resistant materials, increasing the cost while also leaving salt deposits within the engines. The cooling water is kept within precise specifications to guarantee that the engine remains cool when hot, does not experience thermal shock, and can be heated to keep the main engine warm when in port.