# What is the pressure to secure certain temperature?

How to calculate the pressure needed for a pump to ensure a specific temperature in a pipe?

For example, there is a pipe 100m long. A booster pump is needed to pump water with supply temperature 70 deg C. I need to ensure a temperature of 65 deg C at the end of the pipe. How can I calculate the pump pressure needed to ensure 65 deg C at the outflow?

• Is that 65 minimum or 65 maximum? Feb 20, 2017 at 18:27
• 65degC is minimum. Feb 21, 2017 at 9:24
• Considering the comments to the answer I think your question is poorly stated: you are interested in the flow rate through a pipe (and the required pressure drop to reach it) which gives you a certain outlet temperature given a certain external heat loss. Mar 23, 2017 at 7:13
• I think minimum outlet temp 65 deg.C can be achieved in 2 ways: 1. For a given flowrate, pipe must be sufficiently insulated. So that as water flows, heat dissipated is limited. OR 2. For a given heat loss condition, flow must be quick enough so that water only have limited time inside the pipe. Sep 15, 2020 at 4:46