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Heater Applied for a Room HVAC, CFD Simulation

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The present problem simulates heat transfer by a heater inside a room.

 

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Description

Project Description

The present problem simulates heat transfer by a radiator inside a room. In fact, the heater is connected to one of the sidewalls of the room, which acts as a heat source, and its body has a constant thermal flux equal to 1886.792 W.m-2. The sidewalls and ceiling have a thickness of 0.2 m of wood, which has convection heat transfer with the outside; Thus, the ambient air temperature is assumed to be 280 K and the convection coefficient is assumed to be 10 W.m-2.K-1. The purpose of this study is to investigate the heat transfer rate from the heater to the interior of the room using natural convection and buoyancy effect. Therefore, the gravity force is applied to the model.

Room and Heater Geometry & Mesh

We carry out the present 3-D model using the Design Modeler software. The present model consists of a room in the shape of a rectangular cube with dimensions of 4 m * 3 m * 3 m and a heater in the shape of a rectangular cube with dimensions of 0.1 m * 0.8 m * 0.5 m in its interior which is connected to one of the room’s sidewalls. The figure below shows the geometry.

heater

The meshing of room and the heater is done using ANSYS Meshing software and the mesh type is structured. The element number is 87865. The figure below shows the mesh.

heater

Room HVAC by a Heater CFD Simulation

To simulate the present model, several assumptions are considered:

  • 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 z-axis.

A summary of the defining steps of the problem and its solution is given in the following table:

(heater) Models
Viscous model k-epsilon
k-epsilon model standard
near-wall treatment standard wall function
Energy on
(heater) Boundary conditions
Heater wall
wall motion stationary wall
heat flux 1886.792 W.m-2
Sidewalls & roof wall
wall motion stationary wall
(heater) convection heat transfer coefficient 10 W.m-2.K-1
free stream temperature 280 K
Ground wall
wall motion stationary wall
heat flux 0 W.m-2
(heater) Solution Methods
Pressure-velocity coupling   Coupled
Spatial discretization pressure second-order
momentum second-order upwind
turbulent kinetic energy second-order upwind
turbulent dissipation rate second-order upwind
density second-order upwind
energy second-order upwind
(heater) Initialization
Initialization method   Standard
gauge pressure 0 Pascal
velocity (x,y,z) 0 m.s-1
temperature 280 K

Results:

At the end of the solution process, the velocity, temperature, and pressure contours, pathlines, and velocity vectors all in two-dimensional and three-dimensional, are obtained.

 

All files, including Geometry, Mesh, Case & Data, are available in Simulation File. By the way, Training File presents how to solve the problem and extract all desired results.

This ANSYS Fluent project includes CFD simulation files and a training movie.

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