How do you change Btu into pipe sizes?

To convert BTUs (British Thermal Units) into pipe sizes, you first need to determine the flow rate of the fluid in gallons per minute (GPM) that corresponds to the heat load in BTUs. This can be calculated using the formula: BTUs = GPM × ΔT × 500, where ΔT is the temperature difference in degrees Fahrenheit. Once you have the flow rate, you can reference hydraulic charts or tables that correlate GPM to pipe sizes, taking into account factors like fluid type and pipe material. It's essential to ensure that the selected pipe size can handle the required flow and pressure drop efficiently.