St Mary Redcliffe Project 450 RIBA 2 Stage End Report

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In some public areas low surface temperature (LST) radiators have been required where particularly young children could be at risk from scalding by conventional radiators. Consideration should be given to the use of some areas so see if venerable adults or young children are regularly using the space. Shapes, sizes and styles for LST radiators are more limited. Finishes for all radiators are generally white but can be coloured as necessary. All radiators would be fitted with thermostatic valves for local control. Radiators sizing will need to take into account the lower water temperatures expected to be generated by the air source heat pump and will therefore be “oversized” to achieve the same output as from a traditional gas fired boiler system. Existing Heating Plant The existing boiler plant serving the church is to be retained as there are no reports of issues with this system. The current architectural layouts currently require the slab above this plant room to be lowered. From site inspection, this will likely affect the distribution pipework that leaves the plant room at high level. A survey will need to be conducted to make recommendations regarding the required diversions. Heating Distribution LTHW and refrigerant distribution pipework will be distributed largely within ceiling voids and vertically via dedicated risers. Pipework will all be insulated to mitigate the risk of overheating. 9.2 Cooling Where possible, cooling is not proposed for the new development. Natural ventilation solutions will instead provide outdoor air to mitigate the risk of overheating. These will be thermally modelled at stage 3 to inform the expected conditions in the space and any limitations that this puts on the use and occupancy of the spaces. At this stage the expected exception to this is the events space due to its high occupancy and glazing. 2No. options to provide the cooling to this space are being considered as described below: Air Source Heat Pumps – VRF – As described in the heating section above the external heat pumps and FCUs are able to provide both heating and cooling Packaged Air Handling Plant Providing Cooling – Areas with high air volumes can be heated and cooled by heating the fresh air supply. This is a potential solution for the events space and the Hogarth Gallery. As these spaces have fairly high occupancy, this drives a high supply air volume requirement, which has the capacity to provide cooling. A packaged AHU will use a refrigerant compression and expansion system to take heat from exhaust air and “reject” this into the supply air stream. A thermal wheel will also be used to recover heat from the extracted air. This option reduces the required external plant in instances where high air volumes are already required. 9.3 Domestic Water Services Cold Water The proposed extension will increase the domestic cold-water demand of the site. It is therefore expected that an upgrade to the mains cold water will be required to serve the existing and new water outlets. No cold-water storage has been identified on site, and so it is assumed to be a mains fed system. Therefore, it is reasonable to assume that sufficient pressure is available and can a mains fed system can be extended to serve the new development. Confirmation of the cold-water requirements of the kitchen is required. Hot Water Due to the distributed nature of the WCs and kitchen facilities, local hot-water provision is preferred. Each remotes WC area will be provided with a direct un-vented water heater to provide hot water to the basin outlets. The heater will be located under sinks or concealed in risers/store rooms as required. Due to the limited size of the proposed kitchen, it is not anticipated that this will have a high hot water demand and will therefore also be suited to local electric hot water production, but in this case with a small amount of storage. The hot water requirements of the kitchen are to be confirmed. 9.4 Ventilation A successful ventilation strategy is essential to ensure there is adequate fresh air in all areas within the building and that a comfortable temperature is maintained in Summer. All areas and rooms such as gallery, exhibition spaces, event spaces and kitchens etc should be adequately ventilated so they are fit for purpose. The proposed strategy, in keeping with the passive design approach, is to provide natural ventilation for overheating and fresh air to as much of the new development as possible. Where necessary, mechanical ventilation shall be provided. The AHUs (Air Handling Unit) providing the mechanical ventilation need to have high efficiency heat recovery and be designed such that the ductwork pressure drop is minimised to reduce the associated energy consumption. Exhibition Spaces, Café & Education Space 1563.R1 – Stage 2 report Page 16 of 29
1563.R1 – Stage 2 report Page 17 of 29 A passive approach is proposed as a means of ventilating the exhibition spaces, the cafe and the education space. Openings into these areas are to be agreed during stage 3. Where possible, louvres and / or openable windows are to be provided on opposing walls to assist with cross flow ventilation. Thermal modelling will be completed at stage 3 which will inform the expected conditions in these spaces and any limitations that this imposes on the use and occupancy of the spaces. To complete this, expected usage details will be required. complete with a DX cooling and heating coil. The benefit of this system is that it will not require any separate plant for condenser units and will not require any FCUs to be mounted internally. The required AHU plant space is currently under review as this is the preferred option. 2. High level MVHR units, as per the choir room, could be installed which are ducted to high level louvres. This will reduce external ventilation plant, but it will require external condensers units to provide heating and cooling. This option has been discounted due to the high-level services in the space. The architectural preference is to minimize high level services distribution. Cooling strategies such as night-time cooling can be explored at the next stage of design. Hogarth Gallery Fresh air will be supplied and extracted from the Hogarth Gallery via a dedicated Air Handling Unit (AHU). This will be located on the plant deck adjacent to the space and will consist of filtration, attenuation, open/close dampers, DX cooling/heating coil and thermal wheel for heat recovery. Humidity control will be required to provide the required conditions for the displayed artwork. Insulated ductwork will be distributed up within the service void at the rear of the multi-use space to the plant deck. From here, it will serve induction diffusers to ensure that the conditioned airt can be thrown to the low, occupied level within the space. High level return air grilles will allow extract air back to the AHU. The air volume will be sized to provide heating and cooling. As the Hogarth gallery is open to the adjacent exhibition space, the proposed ventilation system will need to provide the same conditions to both spaces. Choir Room Figure 4- Mechanical Ventilation with Heat Recovery Unit. Mechanical Ventilation with Heat Recovery (MVHR) units are proposed for the Choir Room. The unit will draw fresh air and exhaust stale air to louvres in the façade. The units will include a plate heat exchange and summer bypass to assist with free cooling in summer. Air will be ducted to and from linear grilles in bulkheads and ceilings directly. Air distribution within the space will either be through low level supplies integrated into the joinery or alternatively a high level, high pressure supply and extract integrated into a bulkhead detail. Refer to Appendix B for details. Kitchen The existing kitchen at St Mary Redcliffe church has an extract hood connected to a low-level discharge on the North Side of the site. It is proposed to continue this strategy for the new kitchen as the size and use of the kitchen is anticipated to be the same. A dedicated extract fan will be located within the kitchen. The use of the kitchen needs to be confirmed to inform a suitable make up air strategy. Low extract rates will not require any dedicated plant, but a heating load WC A high level of ventilation shall be provided to all WCs and changing areas as these have high humidity. 10 ACH (Air Changes per Hour) shall be provided within these areas to remove the humid air via local extract fans mounted either in the wall direct to outside or within ceiling voids. Attenuation Atmospheric attenuation shall be installed on all inlet and exhaust ventilation systems to minimise noise breakout from the development. Cross talk attenuation shall also be installed where ductwork is shared between rooms to prevent the transfer of noise. Smoke Ventilation A fire engineer or building control officer will be required to advise on the requirements for smoke ventilation. Current plant spaces have not allowed for a mechanically ventilated smoke extract system. 9.5 Waste and Disposal Event Space 2No. options have been considered for the event space main plant. 1. Packaged AHU providing heating and cooling – The space will require a large amount of fresh air due to its high occupancy. It is therefore possible to provide heating and cooling through this air volume with and AHU All sanitary appliances will be provided with a gravity waste water system connecting to the existing below-ground drainage system. Consultation with the design team will be undertaken during the next design stage to co-ordinate the position of above ground drainage. Materials:
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ST MARY REDCLIFFE PROJECT 450 RIBA
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CONTENTS 1.0 PROJECT TEAM 2.0 INTRO
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2.0 INTRODUCTION Funded jointly by
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Project 450 Board Review Instructio
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4.1 STRUCTURES Undertaken by Integr
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s dopted e, whilst A full CCTV surv
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3.2 Existing Trees There are a larg
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Stability can be provided by reinfo
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1563.R1 - Stage 2 report Page 5 of
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LEGEND 40-60 W/m 2 HEAT GAINS - NAT
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LEGEND 40-60 W/m 2 HEAT GAINS - NAT
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4.3 LANDSCAPE Introduction The purp
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Historical Context The southern chu
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Landscape Concept The diagram adjac
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Response to Site The ANGULAR framew
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Sketch Plan: North Churchyard 3 The
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Sketch Ideas Red cliff - continuati
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NORTH CHURCHYARD Simple high-qualit
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SOUTH CHURCHYARD Mown paths/ margin
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4.4 SCHEME UPDATES ARCHITECTURAL PR
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FFL 12.00 FFL 10.36 FFL 10.36 FFL 1
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FFL 12.00 FFL 10.36 FFL 10.36 FFL 1
Page 46 and 47: 4.5 CURRENT PROPOSALS 11 13 3 9 10
Page 48 and 49: 27 29 28 A Concept Image for the Ne
Page 50 and 51: 31 32 The Chancel South Aisle & Pri
Page 52 and 53: 4.6 MATERIALITY The design team hav
Page 54 and 55: PROPOSED OPENING TO NORTH AISLE
Page 56 and 57: Former Opening to South Porch Stair
Page 58 and 59: 4.8 AREAS OF FURTHER INVESTIGATION
Page 60 and 61: 5.0 CONSULTATION In order to ensure
Page 62 and 63: 6.0 COST PLAN Throughout RIBA Stage
Page 64 and 65: 7.0 RISK REGISTER To ensure the eff
Page 66 and 67: SMR - PROJECT 450 - RISK REGISTER R
Page 68 and 69: 8.0 PROGRAMME The below-listed prog
Page 70 and 71: 10.0 APPENDICES Endnotes 1 Sampson,
Page 72 and 73: St Mary Redcliffe Appendix B BS 583
Page 74 and 75: 10.2 ECOLOGICAL ASSESSMENT Contents
Page 76 and 77: 2 Method 2.8 A list of other specie
Page 78 and 79: 3 Results with some parts ancient w
Page 80 and 81: Eurasian Badger Meles meles Mammals
Page 82 and 83: oost is defined as any structure or
Page 84 and 85: Appendix 2 Policy & Legal Considera
Page 86 and 87: A A A A A A A A A A A A A A A A A A
Page 88 and 89: 10.3 MEP STRATEGY 4 Site Infrastruc
Page 90 and 91: 5 Proposed infrastructure This opti
Page 92 and 93: 1563.R1 - Stage 2 report Page 12 of
Page 94 and 95: 9 Mechanical Services Strategy 9.1
Page 98 and 99: Drainage is provided to the existin
Page 102 and 103: Flexible conduits will be used for
Page 106: 35 HYB ASS'D ROU 1 x 75 35 Hyb AR T
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St Mary Redcliffe Project 450 RIBA 2 Stage End Report

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