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Rewarding the green: inadvertent and intended impact on industrial heritage Mark WATSON Historic Environment Scotland; [email protected] Open hearth furnace, Nizhny Tagil, Russia, 1994 Carbon emissions do cause climate change Should we imprison the relics of the coal industry that caused climate to change? Or keep them as warnings? Carbon capture is still some way off. But energy savings can be made through good use of what is already built Embodied energy as part of whole life costing My theme= not Cradle to Grave I will expand on the few incentives for considering embodied energy already expended in making a building, as part of the equation in deciding whether or not to keep it in use, or to re-use it. You have to think about the environmental cost of a new replacement. But cradle to rebirth, without burial SAP and EPC pay no heed to embodied energy, because their focus is on supposed energy in use, but the American LEED system does at least acknowledge whole-life costing. See the annex 57 special session on EEC at CESB16 We need to monitor impacts of climate change over time Ironbridge World Heritage Site, UK A door records floods from 1929 to 2008 Flooding of a converted textile mill in Dundee, so defences were put up. Adapt and mitigate, Kyoto to The challenge of climate change, Copenhagen to Paris How to capture carbon? reduce emissions? or ensure that the carbon already spent is used again and again? (at Port Dundas Distillery in Glasgow) The carbon footprint measures the Total amount of carbon dioxide emissions that is directly and indirectly caused by an activity or is accumulated over the life stages of a product a city has one too! (the High Line, New York City) Whole life costing 1. Whole life costing shows that re-use of buildings can reduce the carbon emissions arising from demolition and building anew, and go some way towards reversing the harm industry has brought to the environment through climate change. 2. The more is kept, the better the outcome in terms of waste not taken to landfill. 3. Existing materials contain embodied energy already spent, and less energy need be devoted to bringing in new building materials Historic buildings capture embodied energy Historic buildings can make a significant contribution towards meeting targets for climate change reduction: already built, adaptable to meet new purposes and may be upgraded in ways sympathetic to their character and performance. (Edward St Mill, Dundee, to a Housing Association) Emissions in use or Embodied energy? Operational savings (by insulation or renewable energy) take many years and rely on human action to keep up proper maintenance. Benefits could be lost if refurbishment cycles are short. Savings in embodied energy achieve immediate reductions in carbon and are passive, don’t need ongoing attention. Refit cycles Short design life and refit cycles increase lifetime emissions. Embodied assessment captures this. SAP assessment of emissions in use does not. right: Logie Schoolhouse, a Europa Nostra award winner, in its 3rd use (school/ church/ house) in 180 years = 60-year cycle Traditional thermal mass (Logie Schoolhouse built of clay) Built and maintained from locally sourced materials, traditional buildings rely on their thermal mass for warmth and cooling, natural light and ventilation. Knowledge of these systems help designers of modern green buildings. British homes are less well insulated than those in Nordic countries and Germany. But grants in Finland to insulate houses had a disastrous impact on existing buildings, shortening their lives due to rot. Traditional wooden houses in Pispala, Tampere, Finland Healthy buildings: don’t seal them up Buildings traditionally rely on: Thermal mass for an even climate Natural light and ventilation Vapour-permeable walls to absorb and release moisture For insulation options see http://www.changeworks.org .uk/content.php?linkid=373 Ventilation extracts from the Lighthouse building in Glasgow by CR MacKintosh Plenum heating: Cool fresh air drawn in at the bottom, warms up and rises as it becomes stale, to be naturally dispersed through these ventilators. yet there are environmentalists who say that the real problem lies in all the old buildings that are “hard to treat”. If only their demolition could be speeded up the earth would be more sustainable. Finding: The current demolition rate needs to be increased fourfold, targeted at the most inefficient and unhealthy homes. http://www.eci.ox.ac.uk/research/energy/40house.php But would it? 40% House campaign demands more demolition Under the 40% House scenario, the demolition rate increases from 20,000 per year now to 80,000 p.a. in 2016 and stays at this level until 2050, giving a total demolition over the whole period 20052050 of 3.2 million properties. Savings beyond those would come from increasing the demolition rate further to 150,000 per year and would reduce the notional lifespan of the average building to 250 years. To get down to 120 years, demolition would have to rise to 234,000 per year. This would enable energy consumption for space and water heating to reduce by 24% 234,000 dwellings demolished in the UK in a single year means = 9% of all Scottish dwellings, or more than: = the total number in Edinburgh (217,654) A lot of celebrities have signed up to support the campaign But evidence is turning against destruction. C20th Law Courts use more energy than 19th Century courts, that are being closed (Min of Justice research) UK government Building Performance Evaluation Programme: Findings from non-domestic projects’ “Average total carbon emissions were 3.8 times higher than the average design estimate – and only 1 of the 49 buildings had actual carbon emissions that matched the design estimate.”** • “Energy Performance Certificates (EPC) do not reliably predict actual energy use in buildings – and there is very little correlation between EPCs and Display Energy Certificates, which record actual energy use.” Innovate UK, Jan 2016 Building conservation meets the recycling protocol by 1. reducing need to build new by re-use of buildings; 2. re-using buildings and their components, reclaiming where practicable materials such as roofing slate, brick and building stone 3. recycling and remanufacturing of materials: easier say where lime is the binder rather than cement (in descending order of preference): Opportunities for mitigation (©Davis Langdon) Refurbishment/ re-use existing structure Reduce structural member sizes through post tensioning Specify materials manufactured using renewable energy Increase recycled and down-cycled content Locally-sourced materials Use alternatives to plastics and other resourceintensive materials Ettrick Mill, Selkirk, before and after conversion to business hub EPC excellent for Ettrick Mill, Eildon Housing Association, 2009, Scottish Borders Long life/ Loose fit buildings The most adaptable building may be an old industrial building that has gone through several changes of use already, e.g. Sugar refinery/ VAT69 whisky bond, and now offices in an Edinburgh mixed-use development Bonnington Bond, Leith, Edinburgh Whisky warehouse -> c.1908 Sugar refinery / store -> 1865 McEwan’s Maltings -> 1865 Scheme A is contrary to use zoning: Scheme B fits zoning Bonnington Bond’s conversion has saved: 182,830,000 MBTU = 1,589,826 litres of gasoline or 192 896 619 800 000 joules or 192 897 timber windows or 65,000 UPVC windows The Greenest Building is the One Already Built EMBODIED ENERGY CALCULATOR To use this calculator, begin by choosing your property type from the box on the left. In the box labelled gross floor area enter your building's total square footage. Click calculate to get the amount of energy "embodied" (that's the total energy spent in the production of a building, from the manufacture of materials to their delivery to construction) in your building! X sq. ft. = MBTU Embodied Energy Investment* With the May T Watts carbon calculator, if Bonnington Bond were demolished Embodied energy invested (heavy construction) 116,400,000 MBTU demolition if totally removed +1,440,000,000 BTU new build as light construction for industrial units +64,990,000 MBTU = 182,830,000 MBTU total would be used British Thermal Unit 1 BTU= one match 1 MBTU= 1,000 cu.ft. of gas or approx I joule 1 Million BTU = 1 055.06 megajoules Other measures of embodied energy in materials are found in MJ so for example, uPVC window 620 MJ/m = 2980 MJ Timber window 207 MJ/m = 995 MJ Material Embodied energy Wood Products Paints 450 ft2 per gallon Asphalt Products Glass Products: Windows Glass Products: Plate Stone & Clay Products: Concrete Stone & Clay Products: Brick Primary Iron & Steel Products Primary Non-Ferrous Products 9000 BTU/BDFT 1000 BTU/sq. ft. 2000 BTU/sq. ft. 15000 BTU/sq. ft. 40000 BTU/sq. ft. 96000 BTU/cf 400000 BTU/cf 25000 BTU/lb 95000 BTU/lb Life Cycle Assessment (LCA). LCA examines the total environmental impact of a material or product through every step of its life from obtaining raw materials (for example, through mining or logging) all the way through manufacture, transport to a store, use in the home and disposal or recycling. (May T. Watts Appreciation Society-sponsored Embodied Energy Calculator ) As the energy efficiency of houses and appliances increases, embodied energy will become increasingly important. Life Cycle Assessment or Whole-life costing LCA can consider a range of environmental impacts such as resource depletion, energy and water use, greenhouse emissions, waste generation and so on http://www.thegreenestbuilding.org/survey.html Reuse of building materials commonly saves about 95% of embodied energy that would otherwise be wasted. http://greenestbuildingistheonealreadybuilt.blogspot.com/ General Post Office or Waverleygate in Edinburgh New home for Creative Scotland Case study: Edinburgh General Post Office or Waverleygate Façade retention was a hugely expensive and time consuming process countless lorries took rubble, concrete and steel away over many months. Edinburgh General Post Office, steel and concrete Work underway: building is cored Then new floors were brought in around a new lightwell. The notional value of the building justifies the investment made in it by institutional investors such as pension funds. Emissions saved in use? Waverleygate claims to be a very green office in terms of its energy performance: chilled beams for cooling (£6.70 per m2, 25% cheaper than other systems) A green roof. Waverleygate embodied energy cost Calculating performance in use is not easy while empty. Emissions could only count as saved if they had previously been made elsewhere in a leaky office. The environmental costs of transporting so much away, and bringing so much new structure in the embodied energy costoutweigh any benefits until it is occupied. Using the greenest building calculator, to demolish the GPO means: Embodied energy lost +Demolition energy +New embodied energy =Energy lost and spent: 211,313,530 MBTU 2,614,188,000 BTU 211,313,530 MBTU 422,627,277 MBTU =3,675,020 gallons of petrol/gasoline http://www.thegreenestbuil ding.org. What does 3,675,020 gallons of petrol/gasoline mean? It would take you 283,298,421 Km in a Skoda Fabia from Earth to Mars or 79,981,635 Km in a Ferrari from Mercury to the Sun What if some of the interior had been preserved? No allowance is made by WRAP in UK But in USA it would get some credit through LEED US Green Building Council America is more green! The US approach gives some credit to use or re-use of a building. See http://www.usgbc.org/Default.aspx Keeping more of other walls and floor structure means a much greater saving in terms of the overall carbon footprint. Example of a Scottish wool mill: Tower Mill in Hawick Tower Mill, Hawick, built 1851 over River Slitrig Tower Mill floorspace 21,635.44sq ft before the work 20,343.77sq ft. after (In fact the building is bigger but some floors have been removed in the cinema) Carbon calculator: if Tower Mill were demolished instead extant embodied energy if demolished new work total LOST 29,856,300 MBTU 201,209,592 BTU 58,119,900 MBTU What if Tower Mill were demolished instead? total 58,119,900 MBTU LOST AND SPENT = 505,390 GALLONS = 258,015 LBS OFCO2 = 3.5 US households in a year = 61 320 087 MJ = 22,000 UPVC windows Frome Silk Mill Fairfield Shipyard offices, Govan Workspace, Glasgow Short=term use of industrial heritage? "Long-life loose-fit" is a motto relevant to functional industrial buildings. Temporary uses in “found” industrial spaces buy time cheaply (West Ward Printing Works, a 4-day pop-up at Dundee International Design Festival, May 2015) The best use for an industrial building might be its next use. Hidden Door Festival Edinburgh May 2014 ‘Hidden Door’ is no longer hidden Now those arches are permanently used And the Hidden Door has moved on to a Lighting depot in 2015 & 2016 So the best use might be the next one The Praha Biennale does this too! The greenest buildings are the ones that are already built. . summary As emissions in use fall, embodied carbon will become the main area for achieving sustainable development. Cultural heritage conservation people need to learn the language of energy conservation We cannot just assume that energy conservation will take the same side as building conservation, but Industrial buildings, due to the often high embodied energy in their heavy construction, will play an important part. Thank you. [email protected] @markrustbucket