Selection of pipe diameter for heating systems
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Question: The supply and return temperatures for the heating hot water are 95/70°C. The heating system is of the top-supply/top-return type, with one vertical pipe carrying 2 sets of radiators (20 radiators each). Based on a hot water flow velocity of 0.5 m/s in the vertical pipe, the required pipe diameter is 12.7 mm. Can DN15 be used as an alternative diameter? What is the range of this flow rate? Is there a minimum value for the pipe diameter?
Why isn’t anyone replying? Is it too simple to not need to consider it?
Refer to Table 3.3.1-1 in the HVAC atlas \"15K519 Common Data for HVAC Design\" for the recommended values of water flow velocity in pipes (m/s). The information is also available in the \"Power Piping Design Manual\", but the data presented in the aforementioned atlas is quite comprehensive, so it should be sufficient
The diameter of pipes for heating hot water is generally not DN15, as this can lead to blockages; the minimum diameter used is usually DN20