Sea Word
Senior Member
In other words, energy efficient AC that isn’t compressor based. Like evaporative but without the wet air into cabin? Our river is never over 75° so I’m just curious if that could be used to cool a stateroom at night.
Greetings,
Mr. IR. "Is that 75 Centigrade or Fahrenheit. ?" Unfortunately, the US is stuck in the 19th century and hasn't grasped SI units yet or they don't admit to it. Pounds, feet, miles/hrs etc. is their MO. Yet, ask most anyone what the size of the engine is in their car and it's X.X liters....
On the other hand, any body of water at 75C would almost be hot enough to boil a duck.
In other words, energy efficient AC that isn’t compressor based. Like evaporative but without the wet air into cabin? Our river is never over 75° so I’m just curious if that could be used to cool a stateroom at night.
Come now, the US is not alone, Liberia and Myanmar still use the English system.
Sure hope the politicians don't insist that latitude and longitude go metric. What would we do without the knot or nm?
Already there:
"The French originated the meter in the 1790s as one/ten-millionth of the distance from the equator to the north pole along a meridian through Paris. It is realistically represented by the distance between two marks on an iron bar kept in Paris."
A dehumidifier will make the cabin much more comfortable, and use a fraction of the energy of an A/C unit. It can be run on batteries.
Continuing the hijack though, I have a hard time seeing the point (or the difference) in the metric system.
In other words, energy efficient AC that isn’t compressor based. Like evaporative but without the wet air into cabin? Our river is never over 75° so I’m just curious if that could be used to cool a stateroom at night.
Already there:
"The French originated the meter in the 1790s as one/ten-millionth of the distance from the equator to the north pole along a meridian through Paris. It is realistically represented by the distance between two marks on an iron bar kept in Paris."
Ground source heat pumps (I have one) still use refrigerant cycles with a compressor, expansion valve, evaporator and condenser, they just transfer heat into or out of water rather than air. It is much more efficient and the reason marine air conditioners use sea water but there is definitely still a compressors in the system .A system like this would basically be a geothermal heat pump. They work great for heating and air conditioning and are far more energy efficient than conventional HVAC. However, with a water temp of 75, I think you could only use it for heating. Groundwater used for cooling is typically much cooler than 75. Then again I have no idea what I am talking about so it might be worth asking an expert in heat pumps.
I thought a dehumidifier was just an air conditioner with the evaporator in line with the condenser; in other words, it cools and dries the air, then puts the heat right back into it on the way out. I suppose a smaller compressor will use less energy, so there is that benefit. And it's true that hot, dry air feels much better than hot, humid air.
Running a dehumidifier will add a surprising amount of heat to the cabin and still require more power than most battery banks could maintain.
Actually a meter is:
The Geneva Conference on Weights and Measures has defined the meter as the distance light travels, in a vacuum, in 1/299,792,458 seconds with time measured by a cesium-133 atomic clock which emits pulses of radiation at very rapid, regular intervals.
Actually it was Napoleon that introduced the metric system to France.
That aside, one of the systems in use on some hire boats incorporate a small radiator, a 12v pump takes water from the canal/river, a fan blows the cooled air from the radiator through a spur into the heating ducting to all cabins.
A dehumidifier sufficient for a 40' yacht requires about 600W and yes that heat will be added to the boat. However once the moisture is out of the air, the upholstery, bedding, woodwork, etc., it will run on a short duty cycle. Mine is just now running about 15% of the time. So it's adding 90 watts, and consuming 7.5 Ah/h, maintaining 40% RH. A/C is better, and it both dehumidifies and cools, but takes way more energy than that. Idea is a small capacity A/C unit, works like a dehumidifier but dumps the heat outside.
"Maybe I can try to pump bilge air up as bad an idea as that sounds lol."
Not a bad idea since it actually works, as long as the boat is one level tall..
Its best if the bilge is clean and doesn't smell.
To lower the humidity, you will need to keep the cabin closed up, no outside air flow to help cool the cabin, now you have devices and people in the boat generating heat and often a 1/2 ton of cast iron cooling off from 170-180 degrees, dissipating heat into the cabin. Even shaded windows are letting heat into the boat and you are doing absolutely nothing to remove heat from the environment. I don't see how this could be comfortable at all unless it is 70 degrees outside or lower to begin with. Dehumidifiers work great for protecting the boat from moisture and mold while you are away from the boat but it is always going to be hot when you enter the cabin.