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# HVAC of an Office CFD Simulation

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Heating, Ventilation, and Air Conditioning (HVAC) is a set of processes used to control the temperature, humidity, and ambient air quality of an environment.

This product includes CFD simulation files and a training movie using ANSYS Fluent software.

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# Problem Description for an Office HVAC

The present study examines the performance of fan-driven airflow inside an office for HVAC operation, including a computer and four lamps. The computer is made of plastic and is considered as a heat source equivalent to 700 W.m-3, while each lamp material is glass and a heat source equal to 2500 W.m-3. On the upper part of two walls of the office, we install two fans to transfer airflow into the office. We also assumed that the doors and windows of the office have convection heat transfer by ambient air. The problem goal is to investigate the effect of blown airflow on the components and people in the office. Also, we simulate the influence of airflow on the heat sources applied in the model.

## The Assumption for HVAC simulation

We consider several hypotheses for this simulation:

The office HVAC simulation is STEADY-STATE, and the solver is PRESSURE-BASED.

We consider the effect of gravity on the flow to be 9.81 m.s-2, because of the natural convection phenomenon caused by the buoyancy force in this model.

## Geometry and Mesh

The present 3-D model was designed by Design Modeler software. The geometry consists of a cubic space called the office for HVAC operation, which consists of several components, including human, lamp, computer, desk and so on.

An unstructured mesh was performed using ANSYS Meshing software. Meshing has been done more accurately for the internal components of the office. In this network, the element number is 547820.

## HVAC CFD Simulation Steps

Here is a summary of the steps to define and solve the problem:

 Models k-epsilon Viscous model Standard k-epsilon model Standard wall function Near wall treatment On Energy Boundary conditions for HVAC Simulation Fan Fan Polynomial pressure jump fan 1 polynomial pressure jump fan 2 wall Walls type for HVAC CFD Simulation 20 W.m-2.K-1 heat transfer coefficient Inlet (door) 283 K Free stream temperature 25 W.m-2.K-1 heat transfer coefficient windows 283 K Free stream temperature 310 K temperature wall under computer isolated bottom (floor) isolated main walls (outer walls) isolated walls of other componenet in office for HVAC CFD Simulation couppled other inner walls Solution Methods for HVAC Simulation Simple Pressure-velocity coupling Second order upwind pressure Spatial discretization for HVAC Simulation Second order upwind momentum Second order upwind energy Second order upwind density first order upwind turbulent kinetic energy first order upwind turbulent dissipation rate Initialization for HVAC CFD simulation Standard Initialization method 283 K temperature 0 m.s-1 velocity (x, y, z)

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.

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