WIND| EVENTS SQUARE Melissa Harrison PROJECT DESCRIPTION The proposal for the Christchurch Events Square invents a new typology for a contemporary convention centre, employing a village-style approach with an assemblage of buildings rather than a single disproportionately large box structure. The new central city plan identies a compact CBD to be bounded by Licheld Street, Madras Street, Bealey Avenue and the Avon River. It was deemed appropriate that a development, so criti- cal to Christchurch’s economic recovery, be located within this compact CBD. It also presented itself as an opportunity to re - vitalise Cathedral Square which, even prior to the devastation caused by the earthquakes, was lacking vibrancy and activ- ity. The proposed assemblage of buildings within the square relate and link with each other, acting as an adhesive to glue the square back together as well as attract people back to the centre. The ow of conventions and events within the square will revive the pulse of the city. A rigorous analysis was undertak en of the existing conventio n centre’s programmatic composition to unveil the short-comings and reveal potential. In addressing the centre’s location within the square, additional programs have been incorporated, in- cluding; a hotel, apartments, rentable retail space at ground level and ofce spaces on upper levels. The initial research undertaken to inform the design was an in-depth study into wind, a reliable and renewable resource. The design for the building was derived from investigations into forms that augment wind ow, taking into account the 3 pre - dominant wind ows in Christchurch; North-East, South-West and North-West. The augmented air ow is utilised to naturally ventilate the convention centre - a civic institution that charac- teristically requires vast amounts of servicing for articial ven - tilation. DESIGN CONCEPT DESIGN INVESTIGATION RESEARCH “Aworld- class convention centre in the heart of the central city is critical for Christchurch’s economic recov- ery and will enable the city to regain its strong position in the conventions market.” The proposal takes on a village-style approach to the new Christchurch Convention Centre. The buildings will occupy the vacant sites within Cathedral Square (located in the pro- posed compact CBD). The driving idea behind the concept has grown out of an in depth study of wind and its relationship with form. The three predominant wind direc- tions in Christchurch are the North- East, South-West, and North-West total site area = 23,000m2 PROPOSED SITE _ CATHEDRALSQUARE PROPOSED PROGRAM _ GROUND LEVEL PROGRAMDIAGRAM proposed massing _ to augment air ow material investigation _ the effect of form on wind macro / singular MASSING STUDY_WIND BEHAVIOUR / PATTERN The catalogue of individual forms, from the material investigation, exhibits the wind responding in a swooping action after it travels around and o ver the forms. When the three predominant wind directions were overlaid there is a strong s-shape pa ttern visible in the North-East to South-West axis. This behaviour of the wind has been applied to the forms to represent the uidity and take on the movement of wind. nort heleva ti on_mas si ngc on ce pt ea st el ev at io n_ ma ss ingcon ce pt so ut hel ev at io n_ma ss in gco nc ep t we st el ev at io n_ ma ss ingcon ce pt The cooler, denser air above the water rushes to ll its place causing the wind to blow. Air above land mass heats up more rapidly during the day causing it to rise and expand. NIGHT WIND CYCLE DIAGRAM During the night, air above land looses heat more rapidly than air above water, resulting in air from the land rushing to ll the air over water. DAYWIND CYCLE DIAGRAM If the building is located with respect to predominant wind directions, higher pressure air on the upwind side will be forced to move through the building via openings. Maximum performance occurs when inlets and outlets are placed at a diagonal in both section and plan. Air drops most of its moisture on the win- ward slope due to de- creasing atmospheric pressure and increas- ing altitude. Different adiaba- tic lapse rates of moist and dry air cause air on the leeward slope to become warmer. higher air pressure on the upwind side lower air pressure on the downwind side wind over a mountain wind over a building cross ventilation diagram When wind hits a building the air will speed up in order to ow around the building to the opposite side. This cre- ates a positive pressure on the upwind side and a negative pressure on the downwind side. absence of vacuum wind over eye form 2 wind over eye form 1 wind section c-c wind section b-b wind section a-a cathedral square pre-earthquate cathedral square buildings to be demolished cathedral square wind ow pre-earthquate cathedral square wind ow after demolition north-west south-west north-east PROPOSED SITE _ CATHEDRALSQUARE The new convention centre calls for double the amount of hall space and a corresponding increase in breakout rooms. They would like a dividable plenary that can hold 2500 people so that they are no longer reliant on the Christchurch Town Hall’s plenary space. There is also a desire for an on-site banquet hall that can be used whilst the halls are set up for events. Con- sideration is to be given to the possibility of incorporating a hotel within the new convention centre. The incorporation of networking spaces, such as bars and cafes, are crucial to the convention centres success as they would encourage delegates to stay on-site and would also act as an attractor of ow. Flat oor access is very important for the trade-halls so that exhibitions can be packed in and out easily and efciently. Consideration should be given to future- proong and expansion SECOND FLOOR PLAN THIRD FLOOR PLAN FOURTHFLOORPLAN FIFTH FLOOR PLAN SIXTH FLOOR PLAN GROUND FLOOR PLAN Awind rose is a graphic tool used by meteorologists to give a succinct view of how wind speed and direction are typically distributed at a particular lo- cation. Presented in a circular format, the modern wind rose shows the frequen- cy of winds blowing from particular di- rections over a thirty year period. The length of each “spoke” around the circle is related to the frequency that the wind blows from a particular di- rection per unit time. Each concentric circle represents a different frequency, emanating from zero at the centre to increasing frequencies at the outer cir- cles. CHRISTCHURCH WIND ROSE event’ssquare site focusbuildings mixed-use development design forum GROUNDFLOORPROGRAM FIRSTFLOORPROGRAM THIRD FLOOR PROGRAM FOURTH FLOOR PROGRAM FIFTHFLOORPROGRAM SIXTH FLOOR PROGRAM As represented above in the Christchurch wind rose, the pre-dominant winds are the North- East, South-West and North-West. These wind directions informed the orientaion of the massing within the site. The catalogue of the effect of form on air ow highlighted the eye form as the optimal shape for augmenting air ow. Hence these forms were distributed throughout the empty sites in Cathedral Square and positioned according to the predominant wind directions. The augmented air ow would be used for the purpose of natural ventilation. The design was addressed with a similar framework to that of the wind scales, at a macro / synoptic, Meso and Micro scale. Synoptic |snäptik| Initially the entire Cathedral Square site was developed at a synoptic scale and program was distributed accordingly. Mesoscale |mezskāl; mē-| Next, a selected area was developed at a Meso scale. The buildings that were chosen were those located in the south- west corner of Cathedral Square. These were selected be- cause of their strong relationship with each other and with the other buildings. Micro-scale |mīkrō| Finally the micro (reduced or restricted size) was developed. This involved the development of the interior spaces, the formation of a material palette and, in particular, the building skin that has a certain scale-like quality with louvre system that enables the panels to open and allows the building to breathe. COURSE THEUNIVERSITYOF AUCKLAND ADVISORS 1st Semester 2012 Advanced Design 1 School of Architecture and Planning Camia Young & Jordon Saunders FUTURE CHRISTCHURCH V2 Type: Synoptic |snäptik| adjective 1. of or forming a general summary or synopsis Synoptic scale winds are measured at a large, general scale. These general or over all con- ditions have a direct relationship with mesoscale phenomena, providing conditions that either enhance or suppress them. This affect is exerted through wind speed and cloud cover which can affect the solar gain of the ground and building mass. Mesoscale |mezskāl; mē-| noun chiey Meteorology an intermediate scale, esp. that between the scales of weather systems and of microcli- mates, on which storms and other phenomena occur. Meso scale winds are measured at an intermediate stage between micro and synoptic scale wind systems. This scale is where the conict occurs which creates storms and unstable wind patterns. Mesoscale wind systems transfer heat and moisture to the overlaying synoptic wind system. Micro-scale |mīkrō| combining form 1 small : microcar. reduced or restricted size Micro scale winds are local scale and relate to regional and city areas. EAST ELEVATION GROUPSITE PLAN SECTION A-A STRUCTURALSKIN east elevation scale 1:500 INDEPENDENTFLOORSTRUCTURE east elevation scale 1:500 INTERNALCOLUMNS east elevation scale 1:500 BUILDING SKIN DETAIL