Originally Posted by sailcay
I wonder if a closed loop system would do the job and let it heat the water itself?
It will heat the water if in the cooling
mode, however in the heat mode, it will cool the water, actually remove heat.
Not trying to be cute but it is important to remember there is no such thing as cold, it's all heat, cooling means removing heat.
A heat pump works of course by moving heat, either into the boat from seawater when in the heat mode or removing it from the boat and dumping it into seawater when in the cool mode.
The colder the water gets, the less heat there is to move of course, and the less heat is removed, but I believe what actually causes them to stop working at some set water temp is the water actually freezes in the condenser, blocking flow of course.
Its sort of like light, there is no such thing as dark, just the absence of light. May sound like I'm making a play on words, but if you understand that there is no dark, then you understand why we can make a flashlight, but can't make a dark projector.
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