Barometer / Air Conditioning
- Thread starter Ken Kindrick
- Start date
If you want to be precise, I'd refer to the Ideal Gas Law.
PV = nRT
Or simply stated, you'll never notice the difference.
PV = nRT
Or simply stated, you'll never notice the difference.
If the intake is in one room and the discharge is in another and you shut the door...... You might see the baro change. This is kinda a moot point as testing it is super simple and you are probably not going to be using the AC anytime (shore power only while at the dock?) you would need the baro to be that precise. while at sea for extended periods).
I know I'm dying of boredom here but "n" and "R" are constant, "V" varies as "T" and "P" is constant because the cabin walls are not sealed .................. I don't understand how the A/C affects the barometer at all or such a small amount that "you'll never notice the difference".
It's cold, rainy and miserable here so give me something to think about. Anything
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Hint-temp is measured in degrees Kelvin. If you assume everything incl. P and V remain relatively constant, it depends on the differential Kelvin T.I know I'm dying of boredom here but "n" and "R" are constant, "V" varies as "T" and "P" is constant because the cabin walls are not sealed .................. I don't understand how the A/C affects the barometer at all or such a small amount that "you'll never notice the difference".
It's cold, rainy and miserable here so give me something to think about. Anything
Measurable, maybe but not with an ambient air barometer.
So, you'll never notice the difference.
Only true if the boat is sealed so any minute change in pressure could not equalize. Colder air is denser but that does not equate to higher AP.
A barometer measures the air PRESSURE. An air conditioner either heats or cools air, it does NOT change the pressure.
Answer is NOPE.
Answer is NOPE.
Plus 1 for Stu. Obviously, if the air can flow without undue restriction there can be no difference.A barometer measures the air PRESSURE. An air conditioner either heats or cools air, it does NOT change the pressure.
Answer is NOPE.
That said, if there were a deep enough column of really cold air, there would be a difference (we're talking many thousands of feet) and also a lot of wind, and that gets to what barometers measure, but that's not what we're talking about here. If there were enough pressure differential to matter much, you would notice the pressure when opening a hatch.
I think you will find that if you can move 0.11 liters of air from/to a room the baro will move by 0.01 " of mercury.
I'm going to go with PLAUSIBLE assuming your cabin is air tight enough so that it can maintain a pressure difference with the out side. I think I saw a video like that here where someone was using a vacuum or leaf blower for that purpose.
Skippers, most boats with inboard engines have blowers. Even boats with outboards have vents for fuel tank storage areas or for general ventilation, like the cuts in hatchboards. Boats are inherently NOT sealed vessels (pun intended).
I don't care how much air your a.c. moves, it ain't gonna change the atmospheric pressure which is what a barometer measures.
The only time this could come into play would be, for example, a clean room in a hospital or a laboratory, where the walls, doors, ceilings & floors are built specially and are sealed. And that construction allows special air conditioning systems to develop RELATIVE pressure between spaces, like a corridor compared to the laboratory room with the hoods. Doesn't change atmospheric pressure at all.
Not, certainly, in a boat.
).I don't care how much air your a.c. moves, it ain't gonna change the atmospheric pressure which is what a barometer measures.
The only time this could come into play would be, for example, a clean room in a hospital or a laboratory, where the walls, doors, ceilings & floors are built specially and are sealed. And that construction allows special air conditioning systems to develop RELATIVE pressure between spaces, like a corridor compared to the laboratory room with the hoods. Doesn't change atmospheric pressure at all.
Not, certainly, in a boat.