Underfloor Heating System with Spiral Pipe, ANSYS Fluent CFD Simulation Training

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The present problem simulates the process of heat transfer through the underfloor heating system using ANSYS Fluent software.

This product includes Geometry & Mesh file and a comprehensive Training Movie.

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Project Description

The present problem simulates the process of heat transfer through the underfloor heating system by spiral pipe using ANSYS Fluent software. In this project, a room is designed in cold winter conditions, and a floor heating system is installed to heat the air inside the room. The underfloor heating system is in the form of a spiral tube that carries the flow of hot water. The hot water pipe is placed inside a layer of concrete and transfers its heat to the concrete layer of the floor. Then, heat transfer inside the concrete layer occurs in conduction, and finally, heat transfer or convection from the ground floor leads to heating of the air inside the room. Air is defined as the ideal gas for the occurrence of free convection heat transfer in the room’s interior. Hot water flows with a flow rate of 0.5 kg.s-1 and a temperature of 303.15 K enter the pipe to perform the heating process.

This is while for the ceiling and walls of the room, a layer of bricks is defined that transfers heat with the cold air of the surrounding environment; So that the ambient temperature is defined as 278.15 K and the heat transfer coefficient is defined as 20 W.m-2.K-1.

Spiral Pipe for Underfloor Heating System Geometry & Mesh

The present model is designed in three dimensions using Design Modeler software. The calculation area of the present model is related to a room with a length of 3.6 m, a width of 2.6 m, and a height of 2.6 m, and a layer of concrete with a thickness of 0.12 m is designed as a solid area in the lower part of this room. Inside this concrete layer, a 0.04 m diameter spiral pipe is designed to be inserted circumferentially, and after a spiral path across the floor of the room is led out of the room.

underfloor heating

We carry out the model’s meshing using ANSYS Meshing software. The mesh type is unstructured. The element number is 2936179. The following figure shows the mesh.

underfloor heating

Underfloor Heating System CFD Simulation

We consider several assumptions to simulate the present model:

  • We perform a pressure-based solver.
  • The simulation is steady.
  • The gravity effect on the fluid is equal to -9.81 m.s-2 along the vertical axis.

The following table represents a summary of the defining steps of the problem and its solution:

Models (underfloor heating)
Viscous k-epsilon
k-epsilon model RNG
near-wall treatment standard wall function
Energy On
Boundary conditions (underfloor heating)
Inlet (Pipe) Mass Flow Inlet
mass flow rate 0.5 kg.s-1
temperature 303.15 K
Outlet (Pipe) Pressure Outlet
gauge pressure 0 Pascal
Internal Walls Wall
wall motion stationary wall
thermal condition coupled
Walls (concrete) Wall
wall motion stationary wall
heat flux 0 W.m-2
Walls (room) Wall
wall motion stationary wall
thermal condition convection
free stream temperature 278.15 K
heat transfer coefficient 20 W.m-2.K-1
Methods (underfloor heating)
Pressure-Velocity Coupling Coupled
pressure PRESTO
momentum first order upwind
turbulent kinetic energy first order upwind
energy dissipation rate first order upwind
energy first order upwind
Initialization (underfloor heating)
Initialization methods Hybrid


At the end of the solution process, three-dimensional contours related to changes in indoor air temperature and water flow inside the pipe, two-dimensional contours related to changes in temperature and velocity on a vertical plane passing through the middle of the room, and velocity vectors on the same plate Two-dimensional are obtained. Two-dimensional and three-dimensional temperature-related meters well indicate the increase in indoor air temperature and the positive performance of the heating system in heating the indoor air. Also, velocity contours and velocity vectors indicate natural heat transfer and the effect of buoyancy.

You can obtain Geometry & Mesh file and a comprehensive Training Movie that presents how to solve the problem and extract all desired results.


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