What size must the conduit be in relation to the supply and return lines?

The conduit size in relation to the supply and return lines should be one size larger to ensure proper flow and to accommodate potential expansion and contraction of the materials. When designing systems that involve fluid movement, such as heating or cooling, it’s crucial to maintain adequate space for the fluid to move freely without causing excessive pressure loss or flow restriction. A conduit that is one size larger allows for this smooth flow and gives a buffer for any variations that might occur in temperature, pressure, or viscosity of the fluids being transported. This approach helps minimize turbulence and ensures efficient operation of the system overall. It's also essential for preventing any potential issues with blockages or back pressure, fostering a more reliable and effective energy transfer.