- Joined
- Jan 13, 2006
- RO Number
- 19956
- Messages
- 363
Just pick-up some phosphoric acid. What mix ratio is adequate?
AC cleaning?
- Thread starter interj
- Start date
- Joined
- Jan 13, 2006
- RO Number
- 19956
- Messages
- 363
Well I like to say thanks for putting this idea into my mind. I went to the boat to flush my a/c unit and snaped the thru-hull trying to remove the freakin hose. [
!] Damn plastic!
One project off the list and one added. [:-banghead]
!] Damn plastic!One project off the list and one added. [:-banghead]
Capt. Bill1
Active member
- Joined
- Jan 1, 2000
- RO Number
- 2017
- Messages
- 6,127
"In my case especially in the forward AC which has the least pressure being further away. Some day i should increase the hose size but flushing is easy."
Yeah my boat is like that. And I have to dom the same thing from time to time. I've toyed with the idea of adding a second pump closer to the fwd unit.
I think you would be better off decreasing the size of the hose a bit as that would result in a increase in pressure giving you better flushing action.
"I went to the boat to flush my a/c unit and snaped the thru-hull trying to remove the freakin hose. Damn plastic!"
Better at the dock then at sea.
Yeah my boat is like that. And I have to dom the same thing from time to time. I've toyed with the idea of adding a second pump closer to the fwd unit.
I think you would be better off decreasing the size of the hose a bit as that would result in a increase in pressure giving you better flushing action.
"I went to the boat to flush my a/c unit and snaped the thru-hull trying to remove the freakin hose. Damn plastic!"
Better at the dock then at sea.
Capt Bill1,
Decreasing the hose size will not increase the pressure at the coil and will most likely decrease the efficiency of the coil.
Decreasing the hose size will only increase the apparent pressure at the pump discharge but will decrease the total flow rate through the coil. A lot of people confuse pressure with flow rate. The ideal way to do this is to increase hose size to eliminate friction loss through the hose. To maximize flowrate and BTUH transfer through the coil the hose friction must be reduced.
Apparent pressure increase at pump discharge does not increase heat transfer - flow rate (gph) does.
It is best to get as much fluid flow through the coil in gph or gpm as possible to to increase efficiency, this will give the highest pressure the fixed diameter of the coil piping will see. Pressure at the pump discharge does not indicate this unless the pump pressure curves indicate that this is advisable. Most centrifugal pumps and positve displacement pumps desire the lowest loss to friction on discharge to increase flowrate. The best bet is to increase pump size (higher flow rate at the same pressure) to maintain the flow rate at the higher pressure. This will give you a higher pressure at the coil, which is a fixed friction loss at the same flow rate.
Decreasing the hose size will not increase the pressure at the coil and will most likely decrease the efficiency of the coil.
Decreasing the hose size will only increase the apparent pressure at the pump discharge but will decrease the total flow rate through the coil. A lot of people confuse pressure with flow rate. The ideal way to do this is to increase hose size to eliminate friction loss through the hose. To maximize flowrate and BTUH transfer through the coil the hose friction must be reduced.
Apparent pressure increase at pump discharge does not increase heat transfer - flow rate (gph) does.
It is best to get as much fluid flow through the coil in gph or gpm as possible to to increase efficiency, this will give the highest pressure the fixed diameter of the coil piping will see. Pressure at the pump discharge does not indicate this unless the pump pressure curves indicate that this is advisable. Most centrifugal pumps and positve displacement pumps desire the lowest loss to friction on discharge to increase flowrate. The best bet is to increase pump size (higher flow rate at the same pressure) to maintain the flow rate at the higher pressure. This will give you a higher pressure at the coil, which is a fixed friction loss at the same flow rate.
Capt. Bill1
Active member
- Joined
- Jan 1, 2000
- RO Number
- 2017
- Messages
- 6,127
"Decreasing the hose size will not increase the pressure at the coil and will most likely decrease the efficiency of the coil.
Decreasing the hose size will only increase the apparent pressure at the pump discharge but will decrease the total flow rate through the coil. A lot of people confuse pressure with flow rate. The ideal way to do this is to increase hose size to eliminate friction loss through the hose. To maximize flowrate and BTUH transfer through the coil the hose friction must be reduced."
I understand it could decrease the efficiency of the coil due to a reduction in the volume of water flow.
But reducing the ID of the hose would increase the pressure. No? Just like when you take your thumb and squeeze the end of a garden hose or when you use a hose nozzle. There by speeding up the flow of the water through the coils and lessening the chance of crud settling in the coils do to sluggish water flow.
It has also been my understanding that to slow a flow of water throught the coils can also reduce the efficiency of the heat exchange process.
Decreasing the hose size will only increase the apparent pressure at the pump discharge but will decrease the total flow rate through the coil. A lot of people confuse pressure with flow rate. The ideal way to do this is to increase hose size to eliminate friction loss through the hose. To maximize flowrate and BTUH transfer through the coil the hose friction must be reduced."
I understand it could decrease the efficiency of the coil due to a reduction in the volume of water flow.
But reducing the ID of the hose would increase the pressure. No? Just like when you take your thumb and squeeze the end of a garden hose or when you use a hose nozzle. There by speeding up the flow of the water through the coils and lessening the chance of crud settling in the coils do to sluggish water flow.
It has also been my understanding that to slow a flow of water throught the coils can also reduce the efficiency of the heat exchange process.
- Joined
- Feb 3, 2006
- RO Number
- 20150
- Messages
- 372
I found that my ac needs to be flushed out every two or three months. And the strainer needs to be cleaned as well. Then again where I am you have to go thirty miles off shore to find thirty feet of water.