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Old 02-26-2012, 10:49 AM   #51
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Re: Somewhereinusa

My thought was that (unless the lines are constantly charged with hot water), the normal cycle of the lines going from hot to cool would create condensation. Could be way off, but it seemed possible, especially in a closed space. And it doesn't take much moisture to get mold started.
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Old 02-26-2012, 11:00 AM   #52
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Re: Somewhereinusa

Quote:
Originally Posted by Tango
My thought was that (unless the lines are constantly charged with hot water), the normal cycle of the lines going from hot to cool would create condensation. Could be way off, but it seemed possible, especially in a closed space. And it doesn't take much moisture to get mold started.
Except that they would never be filled with cold water, they would only be filled with water that is at or above the ambient temperature. When the heater is working, the water is hot. When the heater is off, the water is cooled by the surrounding materials, but it is never cooler than those materials. The only way to get condensation is to have water flowing through the tubing that is cooler than the surrounding air, which just can't happen unless you have some means of cooling the water.

Now, if the water were held in a tank exposed to the outside air, and that outside air were dramatically cooler than the air inside the bus, you could get some condensation on the lines, but that would make for an extremely inefficient heating system, and is thus highly unlikely.
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Old 02-26-2012, 12:30 PM   #53
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Re: Somewhereinusa

Radiantec's DIY page

Mother's Amazing Fin Press Make your own fins to place over the PEX to get the heat to the floor.
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Old 02-26-2012, 12:57 PM   #54
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Re: Somewhereinusa

My 94 bluebird had a total of 3 ac units, one on each side and a smaller unit for the rear. As they we meant to keep 45 people cool I removed one of the main units. I stay as cool as I can stand with the others. Enjoy the project, it's fun. Gslocobrea
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Old 02-26-2012, 05:33 PM   #55
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Re: Somewhereinusa

Curious why pex and not copper?
I have seen several expedition type rigs use copper tube laid into router'd grooves but not pex type tube.
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Old 02-26-2012, 08:20 PM   #56
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Re: Somewhereinusa

These days Pex is preferred because they discovered that even when well affixed, engine & road vibrations will anneal copper lines over time making them hard, brittle and prone to failure. At least that's the story I was told.
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Old 02-27-2012, 10:12 AM   #57
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Re: Somewhereinusa

Must be a long time, cause the two 1970ish campers i stripped, the copper lines were just fine...
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Old 02-27-2012, 11:02 AM   #58
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Re: Somewhereinusa

Best reason I can think of.
Quote:
PEX Prices
3/8" - $0.38
1/2" - $0.40
5/8" - $0.62
3/4" - $0.76
1" - $1.26

Copper Prices
3/8" - $4.87
1/2" - $5.67
5/8" - $7.31
3/4" - $10.21
1" - $13.38
I don't know how current those prices are but probably the article was written in the last couple of years

More from the same article.
Quote:
Advantages of PEX:

Adaptable and easy-to-use plumbing system
Can be used with hot and cold water
Can also be used with metal and PVC piping
PEX has fewer fittings, making it faster to install and with less of a chance to leak
PEX is more burst-resistant due to its flexibility to expand and contract
It has a shutoff valve at each supply line, making it more convenient for you when you have to get repairs done
PEX can have a pressure balanced system
Since it is flexible, the pipes can be bent around most corners and usually won't need a coupling or fitting

Disadvantages of PEX:

It cannot be used outside
Cannot be recycled, due to its shorter life use
It provides an impermeable membrane that may allow the possibility of water contamination
The pipes may be damaged if left outside for a long period of time

Advantages of Copper:
Durable and flexible, making it easy to install Safer in natural disasters Weather and bacteria-resistant Resists corrosion, more so than other metals Unaffected by ultraviolet rays, so it can be used outside Copper does not release toxic gases in a fire because it resists burning In earthquakes, the slightly elastic pipes flex so that they don't snap Copper is recyclable, making it a more sound environmental choice
Disadvantages of Copper Piping

Can corrode
Has become expensive
With higher levels of copper from corrosion, water can have a metallic taste
Copper can freeze and break during cold water
The ability to withstand some freezing is a big plus in a schoolie

Since I found this on the web it has to be true.
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Old 02-28-2012, 11:05 AM   #59
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Re: Somewhereinusa

Disadvantages of pex..
Shorter life span...
Tell that to all the people who have pex installed in their new houses....
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Old 02-28-2012, 01:27 PM   #60
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Re: Somewhereinusa

Pex will last as long or longer than PVC.
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