Presentation on theme: "Hard-to-treat homes 11 May 2005 Tackling Hard-to-treat homes Heat pumps, solid wall insulation and non-traditional construction."— Presentation transcript:
Hard-to-treat homes 11 May 2005 Tackling Hard-to-treat homes Heat pumps, solid wall insulation and non-traditional construction
Hard-to-treat homes 11 May 2005 Energy Efficiency Partnership for Homes Three research exercises commissioned by the Hard-to-treat homes sub-group: Solid Wall Insulation: Impetus, 2004 Heat Pumps: People for Places, 2005 Non-traditional construction: CSE, 2005
Hard-to-treat homes 11 May 2005 Fuel poverty and non- traditional construction Ian Preston, CSE Dr Richard Moore
Hard-to-treat homes 11 May 2005 Background ~1 million non-traditional properties in UK Majority built between 1945 the and early 1970s Over 500 systems built between 1919 and 1976 Termed system-built or pre-fabricated Four broad categories, by wall construction Thermal efficiency varies significantly In practice, the majority of investment was designed to overcome defects
Hard-to-treat homes 11 May 2005 Aims of study Investigate how many non-traditionally constructed homes still exist in the UK Identify the risk of fuel poverty within them Identify examples of best practice and potential case study areas
Hard-to-treat homes 11 May 2005 Methodology Produce estimates of SAP and fuel poverty from all four national HCSfor 80 proprietary systems Analysis by nation, sub-category, and where possible proprietary system Results for Scotland and Wales are limited by the design and in the case of Wales by the quality of their HCS
Hard-to-treat homes 11 May 2005 Methodology (cont.) Estimates of NTH for each local authority Compilation of database from a range of sources Identified 52 authorities with high levels of NTH Contacted the management body to establish works undertaken, and the associated changes in SAP or risk of FP
Hard-to-treat homes 11 May 2005 Sample results Wall construction in England
Hard-to-treat homes 11 May 2005 Non-masonry homes (x1000)
Hard-to-treat homes 11 May 2005 SAP ratings by construction
Hard-to-treat homes 11 May 2005 LA survey 19 out of 52 authorities contacted responded 18 respondents (95%) provided numbers of non- traditional houses (LA or LSVT) 14 supplied details of the improvements made 11 provided indicative figures for average work costs Only 6 had estimates for changes in SAP ratings, None commented on the effects of improvements on fuel poverty
Hard-to-treat homes 11 May 2005 LA Survey Significant levels of improvement works have been carried out on all non-traditional stock Typical measures include; EWI or replacement brick cavity walls, LI, central heating and new kitchens and bathrooms Majority of investment between 1980s and 90s, but there is a significant amount of ongoing maintenance and improvement Estimated cost of works varies significantly, i.e. from £3,000 to £80,000
Hard-to-treat homes 11 May 2005 LA survey Cost of improvements and the value of property is a factor in an authority’s decision to improve them i.e. Rugby Borough Council A comprehensive package of measures is required to a target SAP rating of 65 or above An average cost of £10,000 provides a good indication of expenditure required per property* Costs can be significantly higher when structural work is required to improve or replace walls
Hard-to-treat homes 11 May 2005 Study of heat pumps for Hard-to-treat homes Nicholas Doyle, Places for people Alan Pither
Hard-to-treat homes 11 May 2005 Aims §Report on application of heat pumps to hard-to-treat homes §Guidance to local authorities, architects and developers
Hard-to-treat homes 11 May 2005 Outputs §Main heat pump technologies §Commercial providers §Applicability of the technology §Case studies §Application matrix §Initial guidance
Hard-to-treat homes 11 May 2005 Methodology §Literature review §Database §Interviews with key people Questionnaire 1: Companies Questionnaire 2: Utilities Questionnaire 3: Users
Hard-to-treat homes 11 May 2005 Database §UK Heat Pump Network §Heat Pump Association §Ground Source Heat Pump Club §Clear Skies §Now most up to date Dbase
Hard-to-treat homes 11 May 2005 Key interviews §Heat Pump Association §Manufacturers, Installers and Suppliers §Energy Companies §Landlords §Ground Source Heat Pump Club
Hard-to-treat homes 11 May 2005 Findings §Supplier and installer §Member of HPN §Majority of Technology is G2W plus W2W §Operates throughout UK and occasionally outside §Market split evenly between HA, LA and individual householders §Majority of work in newbuild §Definitely doesn’t believe that HP can be used in HTT - one exception
Hard-to-treat homes 11 May 2005 Findings §Cautious §Overloaded with research §Industry changing fast §A tipping point?
Hard-to-treat homes 11 May 2005 Utilities survey §All EEC managers called §Only 2 responses §Cautious – commercially sensitive §Special tariffs not perceived as necessary §Funding under EEC 2?
Hard-to-treat homes 11 May 2005 Residents’ survey §Prize Draw §Technology ‘Blind’ §Perception of heating and hot water §Penwith HA, Westlea HA, SCHRI §Not Clear Skies
Hard-to-treat homes 11 May 2005 Residents’ survey §Majority had positive views with notable exceptions §Controls understood Split between those who thought they were clear and those who thought ‘could be clearer’ §Costs Limited time with systems Average per week - £13 but ranged from £9 -£20 Majority thought very reasonable or affordable
Hard-to-treat homes 11 May 2005 Types of heat pump §Ground to water §Ground to air §Water to water §Water to air §Air to water §Air to air
Hard-to-treat homes 11 May 2005 Types of operation Heat SourceHeat TransferHeat Output Water Closed Loop Wet Radiator GroundOpen LoopUnderfloor Air Direct Exchange (DX)Warm air Hot Water
Hard-to-treat homes 11 May 2005 Types of system §Ground (or water) source heat pump systems using closed loop water source heat pumps. §Ground (or water) source heat pump systems using open loop water source heat pumps. §Ground source heat pump systems using DX heat pumps. §Air source heat pump systems
Hard-to-treat homes 11 May 2005 Case studies 1 Penwith Housing Association, Ludgvan 2 Westlea Housing Association, Withy Close 3 Fife Special Housing Association, Ochil View, 4 Shettleston Housing Association, Glenalmond Street, Shettleston 5 Geothermal Heating and Cooling, Burton On Trent 6 Geothermal Heating and Cooling, Kidderminster 7 West Lothian Council
Hard-to-treat homes 11 May 2005 Key lessons §Costs dependent on local geological/site conditions §Ground water levels §Need for lining of boreholes §Bore both supply and return boreholes at the same time and an early stage in the project to monitor flows §Lack of a user manual
Hard-to-treat homes 11 May 2005 Key lessons §Need to explain to occupants that their radiators will not be hot to touch §Correct programming and setting of heat pump temperatures to ensure efficient running of the system is vital §Ensure that the best electricity tariff is used §Need to train maintenance contractors
Hard-to-treat homes 11 May 2005 The solution for hard- to-treat homes? §High specific heat loss (> 100 W/m 2 ) so require relatively large heating systems. §If the CoP is >3, they will provide cheaper fuel running costs than any other type of heating system (at current tariff levels). §The issue is whether the capital cost is cost- effective compared to the alternatives: §The capital cost of ground source heat pump systems is relatively proportional to the output required.
Hard-to-treat homes 11 May 2005 The solution? §Running costs of heat pumps may be lower but not low enough for as an alternative to improved insulation. §Low maintenance costs: £120-£250 per year saving (compared with gas systems?)
Hard-to-treat homes 11 May 2005 Factors §Access to mains gas. §Whether the property can be reasonably well insulated using cost effective insulation measures such as cavity wall insulation and loft insulation. §Whether the property is to be comprehensively refurbished, including internal or external wall insulation and floor replacement.
Hard-to-treat homes 11 May 2005 Factors §The existing heating system in the property. §Sufficient space for the installation and adequate means of access for the installation equipment. §Other local factors that could affect the cost, e.g. ground water levels, the capacity of the local electricity network.
Hard-to-treat homes 11 May 2005 The Matrix House/BungalowFlat Mid RiseFlat High Rise Full RefurbHeating OnlyFull RefurbHeating OnlyFull RefurbHeating Only Insul n Poss Insul n Not Poss Insul n Poss Insul n Not Poss Insul n Poss Insul n Not Poss Insul n Poss Insul n Not Poss Insu ln Poss Insu ln Not Pos s Insul n Poss Insu ln Not Poss Gas or Oil Central Heating Installed No central heating but Mains Gas Available No central heating Off Gas Network Existing Electric Storage
Hard-to-treat homes 11 May 2005 Conclusions §Newbuild is the natural market §A significant industry is developing §Existing housing will require individual assessment §Not an alternative to insulation for HTT, but complementary to it
Hard-to-treat homes 11 May 2005 Conclusions - suitability? §Ground source heat pumps for insulated houses off mains gas §Air source heat pumps for high rise/mid rise flats §Combination with small-scale renewables, e.g. wind/PV, but even higher capital costs
Hard-to-treat homes 11 May 2005 Insulating solid walls: a challenge for local authorities and housing associations Dave Barton, Impetus Alastair Brooks, Impetus
Hard-to-treat homes 11 May 2005 Solid wall insulation research Aims: To produce impartial, practical and user-friendly reports To help policy community, local authorities and housing associations
Hard-to-treat homes 11 May 2005 Objectives To investigate: experience of specifying, installation and ‘usage’; range of costs and perceived performance of the technology.
Hard-to-treat homes 11 May 2005 Cost-effectiveness
Hard-to-treat homes 11 May 2005 Why solid wall insulation? More cost-effective than some measures currently promoted Significant energy savings A body of experience in social housing Sound technical guidance Need to disseminate existing practice and instil confidence
Hard-to-treat homes 11 May 2005 Methodology Desktop research Telephone interviews with key players Focus group of experience in: social housing and promoting to the private sector Identify case studies Householders’ feedback
Hard-to-treat homes 11 May 2005 General findings Building improvement measure, not purely thermal improvements, particularly for EWI Opportunity measure, needs long-term planning: not simple retrofit Considerable associated costs and disruption Technical detailing and quality installations are essential
Hard-to-treat homes 11 May 2005 Comparison of IWI and EWI More experience on EWI EWI adds value EWI extends building life EWI better able to deal with cold bridging EWI: systems approach, installers and warranty Overall comparison table in report
Hard-to-treat homes 11 May 2005 Costs Variable dependent upon building type, numbers etc £2000 for IWI is not unusual Typically EWI £5000 to £10000 for EWI Up to £25,000 for a new brick skin and cavity wall
Hard-to-treat homes 11 May 2005 Findings: social housing Generally good feedback from tenants on EWI Issues with mixed tenure on blocks Integrate EWI with glazing programme IWI dependent upon skilled builders Some concern about robustness of dry- lining in social housing No detailed research found on householders feedback
Hard-to-treat homes 11 May 2005 Findings:private sector A few small-scale schemes Limited take-up Grants of £1000 to £3000, some interest free loans Usually marketed with other measures
Hard-to-treat homes 11 May 2005 Social housing exemplars Mid-Suffolk District council: post-1919 terrace improvements London Borough of Enfield: improvements to high-rise blocks Sandwell Borough Council: an example of a new brick skin and cavity wall Sheffield City Council: non-traditional low-rise housing
Hard-to-treat homes 11 May 2005 Private housing scheme exemplars Leicester City Council: Realise The Oxford Solar Initiative Stroud District Council’s Energy Efficiency Grants Wyre Borough Council: Wyred for Energy
Hard-to-treat homes 11 May 2005 Publications Energy Efficiency Partnership for homes www.est.org.uk/partnership/ www.est.org.uk/partnership/ Hard-to-treat homes: a guide for local authorities Investigation of local authority activities w.r.t. HTTH Installing solid wall insulation: a challenge for local authorities and housing associations Installing solid wall insulation: a challenge for policy makers and scheme managers A guide to using heat pumps Heat pump study report Fuel poverty and non-traditional constructions
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