Submersible Water Pump & Hose Questions

[XyBeRz]

Hi, I have a couple of water pump questions please. It's regarding submersible water pumps only. Also I have a question regarding hoses.

Pumps

1. What happens when a hose is longer than the head rating on a submersible water pump?

2. How much difference if you use a smaller diamater hose than on the water pump outlet?

3. Anyone know where to buy a portable but small battery operated water pump?


Hoses

1. Are there any hoses out now that doesn't allow condensation to form on the outside if using ice cold water?

[billb]

1. What happens when a hose is longer than the head rating on a submersible water pump?
2. How much difference if you use a smaller diamater hose than on the water pump outlet?
3. Anyone know where to buy a portable but small battery operated water pump?
Hoses
1. Are there any hoses out now that doesn't allow condensation to form on the outside if using ice cold water?You're a little confused. The head rating is the pressure the pump will put out. In a WC loop, height is not an issue since the energy to lift the water against gravity is regained when gravity helps pull the water back down to where it started. Remember kinetic energy from school, or were you absent that day?. The length of the hose just adds resistance to the flow and "uses up" some of the head.
2.) the smaller the hose the more of the head is "used up" pushing the water through the small hose. With a larger hose there is less resistance, so it doesn't take as much pressure (head) to move the water.
3. No, but why would you want to use one?
1. No, the formation of condensation is not a function of the construction of the hose. Whatever the composition of the hose is, if it's temperature gets below the dew point, condensation will occur.

You mentioned a submersible pump. Be aware that all the heat generated by the motor will be dumped into the cooling loop.

[XyBeRz]

Okay that's what I thought about head pressure in a closed loop system.

And no I was not absent the day they taught us about that in school. It's very unfortunate that the mind doesn't keep as much information the longer you are out of school. :cry:

So I'll stick with the hose that is listed on the water pump so I don't have as much problem with resistance.

I have read that pumps don't put that much heat into the system, but I do understand that heat is heat. In my application I need it to be portable, battery powered, and small whether submersible or inline.

BTW - It's not for water cooling a computer system. I'm designing something else kinda to the same effect as a system for the computer.

Thanks for the great info. :mrgreen:

[billb]

Okay that's what I thought about head pressure in a closed loop system. Here's some more info on heat dump.
http://forums.procooling.com/vbb/showthread.php?t=10825&highlight=dual+mcp600

[XyBeRz]

[smilie=thumbsup.gif]

Thanks billb for that link! I remember that I saw that page somewhere before but I couldn't find the link to it.

Also one more thing. I understand that tubing will condense if colder water goes through than ambient, so I'm wondering if using a foam tube wrap would work to help to insulate it from the outside air and condensation? I'm pretty sure that it would if I sealed it up well.

[billb]

[smilie=thumbsup.gif]

Thanks billb for that link! I remember that I saw that page somewhere before but I couldn't find the link to it.

Also one more thing. I understand that tubing will condense if colder water goes through than ambient, so I'm wondering if using a foam tube wrap would work to help to insulate it from the outside air and condensation? I'm pretty sure that it would if I sealed it up well.
"will condense if colder water goes through than ambient"..Huh?

You will have to accomplish two things:
1. Prevent the "cold" from reaching the outer surface of the insulation.
2. Prevent ambient air from reaching the "cold".

Ambient air
-------------------------
Air barrier
-------------------------

Insulation

------------------------
Cold tubing

Be aware that what you want to accomplish will be difficult, as one tiny spot where air can penetrate to the cold tubing will result in condensation, the condensation will reduce the insulation efficiency (wet foam does not insulate well at all), and that if there are air leaks, condensation will continue to build up in a 24/7 application. Also note that dew points can vary greatly with temperature and humidity.

[XyBeRz]

Any suggestions on any type of foam tubing cover that will still allow it to be flexible to handle?