Re: Terminology ?
This is one of those things that has gotten totally messed up over time. Freshwater, raw water and seawater cooled can also be used to describe closed cooling systems, so the words alone have become almost totally ambiguous. There are stationary generators that are "freshwater" cooled. They get their cooling water for the heat exchanger from a fresh source, but they are in fact also closed cooling systems i.e. the engine coolant never touches the "freshwater" as in a boat with closed cooling. Same can be said of a heavy-duty marine engine. It can be "seawater" cooled and also closed cooling in the same manner as described above, the seawater does not touch the engine coolant, it "cools" the engine coolant via a heat exchanger. "Raw water" is even yet another thing and there is even "keel cooled" sooooooo, IMHO you must determine if the system has a heat exchanger, expansion tank and a pressure cap. If it has those things it is closed cooling, and the closed system is in fact cooled by whatever liquid and corresponding word they choose to use: Freshwater (which often means closed cooling
), seawater or raw water.<br /><br />gspig is correct when he says: "The key to identifying your system is determining if your cooling water passes directly through your engine or if the cooling water passes through a heat exchanger." But the words "seawater", "freshwater" and "raw water" can also be used to describe closed system . . .<br /><br />I hope that is as clear as mud, but I believe it is that messed up.
