To get email notification when someone adds to a thread you're following, click on the star in the thread's header and it will turn yellow; click again to turn it off. To edit your profile, click on the gear.

The Wall has a powerful search engine that will go all the way back to 2002. Use "quotation marks" around multiple-word searches. RIGHT-CLICK on the results and choose Open Link In New Window so you'll be able to get back to your results. Happy searching!

In fairness to all, we don't discuss pricing on the Wall. Thanks for your cooperation.

Need to contact us? Visit https://heatinghelp.com/contact-us/.

dfru
Member Posts: **24**

I am looking for assistance in doing some calculations to determine certain factors associated with an uninsulated water filled pipe. The pipe is 1" copper pipe. It starts off at ambient temperature. Say 60 degrees F. 3 feet away, along the length of the pipe is a tee connection which delivers 140 degree water to the piping system. Assume that 100% of the 140 degree water flows along the other run of the tee, away from the cold water leg, and that there is no flow through the cold water leg. The 3 ft pipe run is horizontal.

How do I calculate the rate of heat transfer to the cold water pipe?

What will the maximum temperature become at the piping along the cold water pipe, 3 ft from the tee?

How long will it take to reach this temperature?

Any assistance would be much appreciated

How do I calculate the rate of heat transfer to the cold water pipe?

What will the maximum temperature become at the piping along the cold water pipe, 3 ft from the tee?

How long will it take to reach this temperature?

Any assistance would be much appreciated

This discussion has been closed.

It looks like you're new here. If you want to get involved, click one of these buttons!

- 94.9K All Categories
- 74.5K THE MAIN WALL
- 2K A-C, Heat Pumps & Refrigeration
- 19 Biomass
- 343 Carbon Monoxide Awareness
- 2.1K Controls
- 772 Domestic Hot Water
- 2.2K Gas Heating
- 23 Geothermal
- 20 Heating Hell
- 76 Indoor-Air Quality
- 19 Job Opportunities
- 1.3K Oil Heating
- 220 Plumbing
- 2.5K Radiant Professionals
- 302 Solar
- 8.2K Strictly Steam
- 17 The Politics of Heating

## Comments

5,660How long is the 1" cu pipe with 60* water? No flow in this pipe? If not how is it maintaining 60* ambient?

T connection from the 140* water pipe to the 60* water pipe?

I think some sort of piping diagram referencing pipe sizes, and fitting locations, flow rate of 140* pipe.

Only partially visualizing what you have let alone function.... Heat exchanger?

24The 1" pipe goes to a water softener, then continues on the the building water supply. Cold water will periodically flow through the pipe, but I am analyzing the system during off hours when there will not be any flow in the system.

The pipe is connected to a domestic water heater, and provides cold water to it. Just upstream from the connection is a recirculating hot water pipe which tees into the cold water line. I am assuming as a worst case that the recirculating water back to the heater is at 140 degrees F.

I will put together a diagram if it still does not make sense.

145This seems like it could be determined with a fairly straightforward differential equation (you have a starting condition, and want to understand the changes with time), but my calculus skills are so rusty that I'm not going to go near this one! If you've got a buddy with a college calculus text around you might get somewhere.