In a closed, recirculating freshwater cooling system used for the towing winch drive engine on your uninspected fishing seiner, what function would chemical treatment with pure ethylene glycol mixed with fresh water primarily perform?
• Behavior of ethylene glycol when mixed with water in engine cooling systems • Meaning of freezing point depression vs boiling point elevation • Purpose of a closed, recirculating freshwater cooling system on an engine
• When you add ethylene glycol to water, what happens to the temperature at which the mixture starts to freeze? • What happens to the temperature at which the mixture starts to boil compared to plain water? • Engine cooling systems may run hotter than 100°C (212°F); how does the coolant mixture help make this possible?
• Be clear on the definitions: depression = lowers the temperature point, elevation = raises the temperature point • Remember that for engines, the coolant needs to stay liquid over a wider temperature range than plain water would allow • Double-check which combination of freezing and boiling changes matches the known behavior of antifreeze (ethylene glycol) in automotive and marine engines
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