♥ It's Just A Diary ...

Have been busy for last 2 weeks, due to Renewable Energy test2, but it turned out to be open book test -___-" I wish i had more time for the test, perhaps lack of practice has slowed down my pace, i need to be more hardworking =)

Another thing that keep nosing me for these few weeks, is our CFD group project, which cover 30% of the subject assessment.

Objective: to analyze the velocity and temperature distribution of BN-0-024 room

Steps
- using GAMBIT to draw out the simulation model of BN-0-024, a meeting room
- using FLUENT to analyze on the velocity and temperature distribution of it
- come out with suggestion and recommendation for energy optimization

Overview of the meeting room

GAMBIT simulation model

Due to over-complexity of the simulation model, the whole idea is simplified into simple shapes, to ease the iteration and analyzing procedure.

GAMBIT simplified model

The following step is to apply size function to the simulation model, which has a start size of 0.1, growing rate of 1.5 and maximum size of 1. The figure below illustrates the simulation model meshing in-progress. The purpose of applying mesh to the volume is to assign a node to almost every part of the volume, in order to get the information of the node, eg temperature and velocity. After meshed, it's then export as ".msh" file to be read in FLUENT.

We are here in FLUENT, to compare between different velocity and temperature inlet of air conditioning units, 9sets of combination model (with different temperature and velocity) have been iterated, which is shown in table below. For those who are confused, let's take model B16 as example, it uses velocity inlet of 10m/s with temperature setting of 16 degree Celsius.

After getting velocity and temperature plots of each of the case, model B16 has been selected as the best options. The red zone showed below represents the heat dissipated from human's body, which is set to be at 310K, or 37 degree Celsius. While the blue zone represents the coolest zone in this temperature range, which is located at the air conditioning inlet on the top ceiling.

Contours of static temperature (X-plane)

Contours of static temperature (Y-plane)

The figure below shows that the velocity flow at the chair is quite high, which is around 1.6m/s, at the optimum air flow which is not stagnant, nor too breezy.

Velocity vectors colored by Z-velocity

Note that these figure shown are just minor part of our project, they are more than 40 figures in our project, which is too much to be uploaded together in this post.

Well, CFD project is done.

What's next?
- Engineering Economics Test 2 - Tues
- Industrial Energy Management presentation - Tues
- Renewable Energy Challenge 2 report - next Mon
- Renewable Energy Challenge 2 presentation - next Wednesday
- Final Year Project presentation - next Thursday/Friday

Everything is going to be so packed in the next few weeks, hope everyone is doing good, stay in your best condition guys.