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How to Design a Hot Water Recirculation System

Designing a hot water recirculation system can be one of the most challenging parts of the job for many engineers. When done correctly, the process can involve numerous iterations of calculations between pipe sizing and heat loss before the final results are realised.

Hot Water Recirculation Systems in High-Rise Buildings

Designing a hot water recirculation system can be one of the most challenging parts of the job for many engineers. When done correctly, the process can involve numerous iterations of calculations between pipe sizing and heat loss before the final results are realised.

This video demonstrates how simple it is to design a hot water recirculation system using h2x, and includes the following;

  • How to Set Calculation Parameters
    • Insulation type and thickness
    • Maximum velocities
    • Pipe materials
    • Delta T between flow and return
  • How to Add Hot Water Plant
  • How to Draw Pipes and Set Pipe Heights
  • How to Connect Fixtures and Valves
  • Calculation Results
    • Return system duty flow rate
    • Return system pressure loss
    • Return system heat loss
    • Balancing valve Kv value
    • Pipe peak flow rate
    • Pipe return flow rate
    • Pipe diameter
    • Pipe velocity
    • Pipe loading units
    • Fixture static pressure
    • Fixture dynamic pressure
    • Fixture Dead Legs

Tip - Press the box in the bottom right-hand corner of the video to go full screen!

If you'd like to learn more technical details about Hot Water System design, why not check out our blog post at the link below.

6 steps you must consider before designing your next hot water system

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"Using h2x was pivotal, allowing for precise heat loss calculations, pipe sizing and flow rates for each room.

This level of detail ensured that the heating load accurately matched each space's requirements, minimising energy waste and maximising comfort.

The strategic placement of heat pumps and careful sizing of pipework were crucial in maintaining minimal pressure drops over an 18-metre distance."

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"I would estimate over the length of this project, I have spent 50% less time designing than I would on our previous software.

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"The quality of the designs saw significant improvement with the adoption of h2x."

"The software offers precision through detailed result outputs and advanced options for efficient pipe sizing, allowing heating engineers to optimise based on parameters like maximum velocity and pressure drop."

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