Title : HEATING AND VENTILATION ANALYSIS OF HACKNEY CENTRAL HALL

by : F. de Trogoff, Engineer, Consultancy

Date: 1997 - PHOENICS Version: 3.0

Details:

• The case was three dimensional, and the flow was steady.

• The geometry within the domain was created using PHOENICS-VR. As the auditorium was very nearly symmetrical, only half of the domain was modelled.

• The theatre includes balconies modelled as a series of stepped Cartesian blockages, and a new object was created to model the curved roof and stage.

• The computational domain is 33m long by 11.4m wide by 12.7m high, a 60*20*50 cells Cartesian grid was used, and the Arbitrary Source (or Solid) Allocation Procedure (ASAP) was used to map the non- Cartesian elements of the geometry; e.g. the curved roof and stage.

• The domain is filled with air, and ideal gas law was used in calculating pressure-temperature-density relationships. The roof, floors and walls were modelled using a material with the following properties; density: 1700kg/m***3, specific heat: 800J/kg/degK, thermal conductivity: 0.62W/m/degK.

• The effects of gravity were included by way of sources of momentum in the equations for the z component velocity using the built in buoyancy facilities available in PHOENICS.

• The LVEL model of turbulence is used to close the Reynolds-averaged Naviers-Stokes equations.

• The air supply under the balcony, on the long side of the theatre, is introduced at 12degC. The incoming air velocity, from this long, slot is fixed at 3m/s, giving a mass flow rate of about 2.5m***3/s.

• Further air is supplied under the seating, at the rear of the auditorium only, at 18degC. The inflow supply rate is 0.7m***3/s, providing by seven 70mm high inlets.

• The occupant and light gains were modelled using heat sources respectively equivalent to 145W/m**2 and 50W/m**2.

• The ten outlets at the top of the domain were modelled as 500mm long by 250mm wide fixed pressure openings.

1. PHOENICS-VR model of Hackney Central Hall
2. Temperature and velocity in a centrally-located cross-section
3. Temperature and velocity in the longitudinal plane of symmetry

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