St Mary Redcliffe Project 450 RIBA 2 Stage End Report

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5 Proposed infrastructure This option utilises reusing the existing abandoned cable from the Broughton house substation and extending it (green line below) to Saint Marry Redcliffe to provide supply for the phase 1 (90kVA). 5.1 Gas There is an existing gas supply to the site that serves the existing boilers and kitchens. This is to be retained and left untouched, unless a risk is identified due to construction. In this case it will be diverted to suit the new layout. 5.2 Water Any existing cold-water supply will be upgraded if required to serve the new development. Currently, there is no water storage is proposed for the site. This is to be confirmed by the Client. 5.3 Drainage New drainage connections from the new build extensions will be required. 5.4 Electrical supply Electrical load assessment 5.4.2.1 Application for new connection for Phase 1 & 2 The electrical load assessment has been carried out with the support of the design team and the Client to determine the electrical load profile of the new buildings. The developed design calculations indicate that the new buildings could use in region of 220kVA including 10% spare capacity for future. An application was made to WPD for the new supply, reference number 3478246. Consequently, QODA met with WPD on site to discuss various supply options including re-using spare capacity on the existing incomers. WPD confirmed that there is no spare capacity in the area at Low Voltage which would mean a new HV/LV substation will need to be provided. The budget cost for this is £52,800 as identified by WPD. 5.4.2.2 Application for new connection at Low Voltage for Phase 1 only This load can be split between the two significant project phases into South and North and are 130kVA for South and 90kVA for North. Splitting the load into the two phases gives more advantage as it could be possible to supply the smaller 90kVA load without a substation with anticipation that when the phase 2 goes ahead there will be more inbuilt capacity in the WPD network for the phase 2 to avoid substation. If the substation has to be provided then it would be provided only for the phase 2. More research has been done in co-operation with WPD to establish the feasibility of supplying phase 1 at low voltage. The following possible option has been identified and is currently being reviewed by WPD (22/11/2019). Temporary solution The Phase 1 Low voltage supply option is currently being reviewed by WPD. At present the agreed solution is to allow for space for the new 500kVA substation in the location of the phase 2 project with the possibility to build the substation during phase 1 if there is no other way. E.g. if the option 2 low voltage supply doesn’t become possible. 5.5 Telecommunications The current proposal is to relocate the existing patch cabinet into the new Vestry back office and redirect all existing services into this new location. The services will include Fibre optic cable, copper data cables and security services. At present it is not envisaged that a new telecommunication services will be required. 1563.R1 – Stage 2 report Page 10 of 29
6 Low/Zero Carbon Technologies The following table sets out QODA’s feasibility study of using low/zero carbon technologies within the design of the new visitor center at St Mary Redcliffe Church. The baseline option would be to use mains gas for space heating and hot water and electricity from the grid for lighting and power. Technologies have been assessed based on their technical viability at this stage. Technology How it works Key Considerations Viability for St Mary Redcliffe Biomass • Energy by burning solid organic matter in the form of wood chips or sawdust pellets. • Biomass boilers can provide energy for heating and hot water systems. • A carbon neutral energy source. • Best suited for relatively continuous operation. • Require store facilities to accommodate the fuel. • Ideally, biomass fuel should be sourced locally to reduce transport costs and associated carbon emissions. • Use may be limited in Smoke Control Zones. To allow Biomass to be viable for the site ideally you would want to create a centralised energy centre that would provide heating and hot water for the whole site. A Biomass system does require a large area for storage and good access for delivery lorries. Therefore, looking at this development in its own right then biomass would not be a viable option. Ground-source Heat Pump (GSHP) • GSHPs transfer heat from the ground into a building to provide space heating and/or hot water. • The ground tends to be at a constant temperature of around 12°C throughout the year and, through the use of a refrigerant cycle this constant low grade heat can be harnessed to provide a useful level of heat for a building. • Feasibility depends on space for the piping circuit and whether the geology is suitable for either boreholes or trenches. • Heat pumps are most suitable for low temperature heating systems such as underfloor heating. • The capital cost of GSHPs are significantly higher that fossil-fuel boiler. • Greatest carbon savings when combined with renewable electricitygenerating technologies. Due to the restraints of the site being a city centre and burial location the only way to incorporate a GSHP system would be through using boreholes. Detailed investigations would need to be carried out to look at the ground conditions. Therefore, we have deemed this technology to be not viable on this project. Air-source Heat Pump (air to water ASHP) • Heat pumps and exchangers extract heat from outside air to provide space heating and/or hot water. • ASHPs are less efficient than GSHP due to the lower average temperature of outside air and greater variance across the year. • Requires a suitable location for the external unit to the building - planning permission may be required. • The noise generated by the external unit must be considered. • Like GSHPs, air to water ASHPs are most effective when providing space heating via under-floor heating systems designed to operate at temperatures of around 30°C-40°C. • ASHPs are easier and cheaper to install than GSHPs however GHSPs are more efficient. ASHP work best when working at low temperatures. Therefore, this would be most viable for the new build extension areas. In the existing church the ASHP would struggle to reach the required temperatures to link into the existing system. We are currently looking to use a variation of an ASHP which allows for cooling and heating via an air to air system. This is often referred to as a VRF or multi split system. ✓ 1563.R1 – Stage 2 report Page 11 of 29
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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
Page 40 and 41: 4.4 SCHEME UPDATES ARCHITECTURAL PR
Page 42 and 43: FFL 12.00 FFL 10.36 FFL 10.36 FFL 1
Page 44 and 45: 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 92 and 93: 1563.R1 - Stage 2 report Page 12 of
Page 94 and 95: 9 Mechanical Services Strategy 9.1
Page 96 and 97: In some public areas low surface te
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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