Ship water chiller

ship water chiller
ship water chiller
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The absorption chiller uses hot (waste) cooling water from the diesel engines – normally disposed of over board – to produce chilled water serving the HVAC installation. As absorption chillers use heat to drive the refrigeration cycle, they only consume a small amount of electricity to run the pumps on the unit. Absorption cooling can result in energy savings of up to 95%. Absorption chillers generally use steam or hot water to drive the lithium bromide refrigeration cycle but can also use other heat sources. HOW IT WORKS An absorption cooling cycle relies on three basic principles: When a liquid is heated it boils (vaporizes) and when a gas is cooled it condenses. Lowering the pressure above a liquid reduces its boiling point. Heat flows from warmer to cooler surfaces. Absorption cooling relies on a thermochemical ‘compressor’. Two different fluids are used: a refrigerant and an absorbent. The fluids have high ‘affinity’ for each other, which means one dissolves easily in the other. The refrigerant – usually water – can change phase easily between liquid and vapor and circulates through the system. Heat from a hot water boiler, steam or a waste heat source drives the process. The high affinity of the refrigerant for the absorbent (lithium bromide) causes the refrigerant to boil at a lower temperature and pressure than it normally would and transfers heat from one place to another.


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