1 The Use and Application of CFD in the Air Conditioning and Fire Protection Industry AIRAH NSW February 2008
2 The Use and Application of CFD in the Air Conditioning and Fire Protection Industry An Introduction to CFD Modelling using PHOENICS By Dr John Ludwig Concentrated Heat and Momentum UK
3 What does CHAM do? Simulation of processes involving fluid flow, heat transfer, chemical reaction & combustion within engineering equipment and the environment A-Z industrial & environmental applications Practical - Cost-effective - Validated - Easy to Use
4 A wide range of applications Smoke & fire spread Heating & Ventilation Aerodynamics Impeller pump efficiency
5 A wide range of applications Heat transfer Multi-phase Particle tracking
6 Main Features of PHOENICS 1-,2- and 3-D geometries Cartesian, Polar and Body-Fitted Coordinates Local multi-level fine-grid embedding Cut-cell technique for complex geometry Conjugate Heat Transfer Single or Multi-Phase Flow Particle Tracking Chemical reaction Radiation Non-Newtonian Flow Choice of equation solvers and differencing schemes Run-time implementation of user code no recompiling Automatic convergence control
7 Main Features of PHOENICS PHOENICS consists of several modules: VR-Editor for setting up problems, EARTH for solving the problem, VR-Viewer for visualising results; and POLIS for providing information. Together they allow users to solve a wide range of 1D, 2D and 3D fluid flows simultaneously with heat transfer and chemical reaction.
8 PHOENICS Key Components Model setup VR Editor Clicking on an object brings a dialogue box onto the screen. This enables the information about the object to be edited.
9 PHOENICS Key Components Model setup VR Editor The object geometry can be taken from a library of shapes, or loaded from a CAD file. CAD geometries are read using the STL format
10 Analysis of Results - VR Viewer The VR Viewer allows users to see their results in a number of different ways:
11 Analysis of Results - VR Viewer Streamlines, static or animated Iso-surfaces Contour planes Vectors
12 What is FLAIR? FLAIR is a Special-Purpose version of the general CFD code PHOENICS. It is aimed at the HVAC community. It has been created by removing many unneeded generic features, and adding several specific features.
13 FLAIR Features FLAIR uses the PHOENICS VR-Editor to set the problem up, with the following additional items: ISO 7730 Comfort index calculations: PMV, PPD. ISO 7730 Draught rating. CIBSE dry resultant temperature. Humidity calculations, with output of humidity ratio and relative humidity. Smoke movement calculation, with output of PPM, smoke density and visibility. Mean age of air calculation. Fan operating point calculation for single and multiple fans. System-curve calculations.
14 FLAIR Features In addition, the following object types have been added: Diffuser Round
15 FLAIR Features In addition, the following object types have been added: Diffuser Vortex
16 FLAIR Features In addition, the following object types have been added: Diffuser Rectangular
17 FLAIR Features In addition, the following object types have been added: Diffuser Directional
18 FLAIR Features In addition, the following object types have been added: Diffuser Grille
19 FLAIR Features In addition, the following object types have been added: Diffuser Displacement
20 FLAIR Features In addition, the following object types have been added: Diffuser Fire
21 FLAIR Features In addition, the following object types have been added: Diffuser Fire Person (standing or sitting facing any Direction)
22 FLAIR Features In addition, the following object types have been added: Diffuser Fire Person Crowd To represent a large number of people as distributed source of heat
23 FLAIR Features In addition, the following object types have been added: Diffuser Fire Person Crowd Sunlight Created in Shapemaker
24 FLAIR Features In addition, the following object types have been added: Diffuser Fire Person Crowd Sunlight Spray head
25 FLAIR Features Spray-head represents sprinklers user for fire-suppression. It uses GENTRA to model the droplet paths. Evaporation is considered, and is linked to the FLAIR humidity model. The GENTRA inlet table is written automatically.
26 FLAIR Features In addition, the following object types have been added: Diffuser Fire Person Crowd Sunlight Spray head Jet fan
27 Example Case Studies The following Application Examples will be shown: Car Park Safety Office Building Ventilation External flow over buildings
28 PHOENICS Carpark Example
29 Car Park This work was carried out as a Consultancy model-build in support of ExcelAir BV in Holland. It concerns the spread of smoke through a complex car park as a result of a car fire on one of the lower floors. The car park is spiral in form, with an open centre. The car fire is 8.3 MW. After 180s, sprinklers on the floor where the fire is are activated.
30 Car Park - Geometry Roof in place
31 Car Park - Geometry Roof removed
32 Car Park - Geometry Roof, lift shafts and first floor removed
33 Car Park - Geometry More floors removed
34 Car Park - Geometry Fire and sprinklers on lowest floor
35 Car Park - Geometry Sprinklers activated
36 Car Park - Sprinklers Close-up of sprinklers
37 Car Park - Sprinklers Close-up of sprinklers
38 Car Park - Temperature This slide shows the temperature contours in a plane near the fire after 400s. The high temperatures are mainly on the floor with the fire.
39 Car Park - Visibility Sight length after 400s. This is the distance you can see. 30m is assumed to be infinitely far. The visibility near the fire is poor, <0.5m, but is still acceptable on the upper floors. The central well is also filling with smoke.
40 PHOENICS applied to Steady-state Simulations of the Internal Flow within a Multi-storey Building
41 Introduction CHAM s Consultancy Team used PHOENICS/FLAIR for the analysis of a multi-storey building in the Kista region of Stockholm, Sweden. A model was created for testing the internal temperature distribution when subjected to worstcase winter and summer conditions (i.e. very cold or very hot).
42 Introduction There was concern about: the production of cold downdrafts in the atrium or along the large glassed façades during the winter whether there were regions of unacceptably high air temperature during the summer time.
43 Introduction The building design was supplied in the form of a number of AutoCAD.DWG (Drawing) files of the building and its location, along with the operational boundary data, such as: the glass specification, the building material, internal heat sources, together with an estimate of the number of people, and supplementary heating and cooling baffles.
44 Geometry Creation Eight offices are located on four floors on either side of the atrium. AC3D was used to create bespoke objects for the office floor
45 Geometry Creation Included within the model are some 650 objects representing doors, walls, roof, ceilings, glass windows, computers, persons, office furniture and various types of heat-sources. The distribution of these objects in all offices on each floor is similar.
46 Geometry Creation Once one floor had been created, the Array Copy feature was used to quickly generate the remaining floors.
47 Problem Specification To represent summertime conditions, a total solar heat gain of 46,580 Watts is specified through the glass doors and windows, with the radiation projected onto the floors and internal walls. This is in addition to the normal heat generated by people in the conference room and offices, and by lights and machines inside the building. The temperature within the building is regulated by an air conditioning system introducing cooled air at 15 C, and a ventilation system generating a total air exchange of 2300 l/s throughout the building.
48 Problem Specification The winter case differs in that there is no solar heat affecting the temperature in the building. Due to the low temperature outside, the glass door and all the glass windows take heat away from the building. The temperature of the ventilation air in the building is increased from 15 C to 18 C.
49 Results A total mesh size of 1.1M cells (108 * 123 * 85) was used, non-uniformly distributed over the entire calculation domain.
50 Results A converged solution was obtained after 2000 iterations, which took 22 hours to complete on a 3MHz PC, and 8.5 hours on an equivalent 4- processor cluster using the parallel version of PHOENICS.
51 Results Summer temperatures X plane
52 Results Winter temperatures X plane
53 Results Summer temperatures Y plane
54 Results Winter temperatures Y plane
55 Results Velocities in one of the rooms
56 Results Velocities in one of the rooms
57 Results Temperatures in one of the rooms
58 Results Temperatures in one of the rooms
59 Conclusion These, and more-detailed, results were supplied to support evidence from CHAM s customer to demonstrate the effectiveness of the building s HVAC design under atypical weather scenarios.
60 PHOENICS Applied to Large-scale Environmental Flows
61 Large-scale Environmental Flows The work concerns localised environmental conditions which could affect the occupants of the buildings as well as pedestrians.
62 Large-scale Environmental Flows The objectives of this project are: to investigate the influence of different wind speeds and wind directions on the air flow throughout the residential area; to reveal any unusual wind patterns that may cause suction and up- and down-drafts that could render podium, balcony, penthouse or terraced areas at lower or upper levels dangerous to the residents.
63 Large-scale Environmental Flows In the past, such an investigation would have required: the construction of a small-scale model of the proposed complex of buildings, placing the model in a wind-tunnel, and making extensive measurements. Nowadays, use of simulation techniques enables the same information to be obtained more swiftly, and at smaller financial cost. CHAM has therefore employed its proprietary software package, PHOENICS-FLAIR, to evaluate the aerodynamic implications of the CAD-file representation of the Residential complex supplied by the client.
64 Large-scale Environmental Flows In the first stage of the work, reported here, the complex has been studied as a whole, in order that the influences of one building on another can be included in the prediction. In later stages it is proposed to study in finer detail such individual buildings, and parts of buildings, as the first-stage study has shown to deserve further attention.
65 Large-scale Environmental Flows Geometry and calculation domain The calculation domain covers the entire area of 2939m x 1300m, provided by the Client in a single geometry file, including all the buildings and surrounding areas. The height of 302m from the ground in the vertical direction of the calculation domain provides about 100m open space above the tallest building.
66 Large-scale Environmental Flows Physical modelling Three-dimensional conservation equations are solved for mass continuity and momentum. The flow is steady. The Cartesian co-ordinate system is employed. A non-uniform mesh distribution is adopted with finer meshes assigned around the buildings. The grid used uses 208 x 167 X 46 cells. Ground friction is considered. The turbulence is represented by the LVEL turbulence model built into PHOENICS.
67 Large-scale Environmental Flows Boundary conditions A wind profile of U 1/7 with the measured wind speed at a height of 8m is employed at the boundaries where the wind enters the domain. In-Form is used to set the boundary layer profile.
68 Large-scale Environmental Flows The results show that the predicted localised wind speed increases as the incoming wind speed increases and as the height from the ground increases. The maximum wind speed could reach over 200 kph.
69 Large-scale Environmental Flows In-Form was used to deduce the velocity in kph from the standard PHOENICS m/s.
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