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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 modelk-epsilon
k-epsilon modelstandard
near-wall treatmentstandard wall function
Energyon
(heater)Boundary conditions
Heaterwall
wall motionstationary wall
heat flux1886.792 W.m-2
Sidewalls & roofwall
wall motionstationary wall
(heater)convectionheat transfer coefficient10 W.m-2.K-1
free stream temperature280 K
Groundwall
wall motionstationary wall
heat flux0 W.m-2
(heater)Solution Methods
Pressure-velocity coupling Coupled
Spatial discretizationpressuresecond-order
momentumsecond-order upwind
turbulent kinetic energysecond-order upwind
turbulent dissipation ratesecond-order upwind
densitysecond-order upwind
energysecond-order upwind
(heater)Initialization
Initialization method Standard
gauge pressure0 Pascal
velocity (x,y,z)0 m.s-1
temperature280 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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