Andrew Pace
Most ships have a freshwater cooling system, which uses freshwater as a cooling medium for the engine room machinery. This type of central cooling system consists of three different circuits: a high-temperature circuit, a low-temperature circuit, and a seawater central cooler. The high-temperature circuit is used for cooling machinery that operates at high temperatures, such as the main engine jacket water system, while the low-temperature circuit is used for cooling machinery that operates at low temperatures, such as auxiliary systems. The seawater central cooler regulates the flow of seawater according to the temperature of the freshwater. In this system, fresh water is circulated through the engine and through a heat exchanger, absorbing the heat of the engine.
| Characteristics | Values |
|---|---|
| Type of system | Central cooling system |
| Cooling medium | Freshwater |
| Machinery cooled | Engine room machinery |
| Machinery operating at high temperatures | Main engine jacket water system, freshwater generator, diesel generator during standby condition |
| Machinery operating at low temperatures | Auxiliary systems |
| Advantages over raw water system | Extreme, especially in saltwater |
| Resale value | Higher than direct cooled boats |
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What You'll Learn
- Freshwater cooling systems use three different circuits
- The high-temperature circuit cools machinery operating at high temperatures
- The low-temperature circuit cools machinery operating at low temperatures
- The raw water system circulates water through the engine water jacket
- The enclosed system circulates fresh water and coolant through the engine water jacket
Freshwater cooling systems use three different circuits
In a freshwater cooling system, fresh water is circulated through the engine and through a heat exchanger. The fresh water absorbs the heat of the engine. Raw water is drawn up through the seacock but only flows through the heat exchanger jacket. This cooler raw water absorbs the heat from the fresh water through the heat exchanger jacket and is then pumped out through the exhaust.
The advantages of a freshwater cooling system over a raw water system are significant, especially when operating in saltwater. Saltwater tends to build up a corrosive scale when the engine operates above 140°F. A boat fitted with a freshwater cooling system will also hold its resale value better than one that is direct-cooled with raw water.
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The high-temperature circuit cools machinery operating at high temperatures
In a full system, all parts of the engine are cooled with circulated treated fresh water. The fresh water absorbs the heat of the engine. Raw water is also pumped through the heat exchanger where it absorbs some of the heat of the fresh water and is again exhausted overboard. The advantages of the enclosed system over the raw water system are extreme, especially if you are operating in salt water. Salt water tends to build up a corrosive scale when the engine operates above 140°.
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The low-temperature circuit cools machinery operating at low temperatures
A boat fitted with a freshwater cooling system will hold its resale value better than one that is direct cooled with raw water. This is because the engine is better protected. In a full system, all parts of the engine are cooled with circulated treated freshwater. The raw water removes heat from the engine through the heat exchanger and is then injected into the exhaust elbow to quench the exhaust. This system provides maximum protection to the engine from the ill effects of direct raw water cooling.
A freshwater cooling system on ships is a type of central cooling system that uses freshwater as a cooling medium for the engine room machinery. The enclosed system circulates fresh water and coolant through the engine water jacket and through a heat exchanger. This fresh water absorbs the heat of the engine. The raw water is also pumped through the heat exchanger where it absorbs some of the heat of the fresh water and is again exhausted overboard.
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The raw water system circulates water through the engine water jacket
The raw water system is contrasted with the enclosed system, which circulates fresh water and coolant through the engine water jacket and through a heat exchanger. This fresh water absorbs the heat of the engine. The raw water is also pumped through the heat exchanger where it absorbs some of the heat of the fresh water and is again exhausted overboard. The enclosed system provides maximum protection to your engine from the ill effects of direct raw water cooling.
The freshwater cooling system on ships consists of three different circuits: the high-temperature circuit, the low-temperature circuit, and the seawater central cooler. The high-temperature circuit is used for cooling the machinery that operates at high temperatures, such as the main engine jacket water system, the freshwater generator, and the diesel generator during standby condition. The high-temperature freshwater is maintained by low-temperature freshwater and is circulated by electrical cooling water pumps. The low-temperature circuit is used for cooling the machinery that operates at low temperatures, such as the auxiliary systems.
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The enclosed system circulates fresh water and coolant through the engine water jacket
The high-temperature circuit is used for cooling the machinery that operates at high temperatures, such as the main engine jacket water system, the freshwater generator, and the diesel generator during standby condition. The high-temperature freshwater is maintained by low-temperature freshwater and is circulated by electrical cooling water pumps. The low-temperature circuit is used for cooling the machinery that operates at low temperatures, such as the auxiliary systems.
The advantages of the enclosed system over the raw water system are extreme, especially if you are operating in saltwater. Saltwater tends to build up a corrosive scale when the engine operates above 140°.
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Frequently asked questions
A fresh water cooling system is a type of central cooling system that uses fresh water as a cooling medium for the engine room machinery.
Fresh water is circulated through the engine and through a heat exchanger. The fresh water absorbs the heat of the engine. Raw water is also pumped through the heat exchanger where it absorbs some of the heat of the fresh water and is then exhausted overboard.
A fresh water cooling system provides maximum protection to your engine from the ill effects of direct raw water cooling. It also helps a boat hold its resale value better than one which is direct cooled with raw water.
