Presentation on theme: "Servite HA Inverness Pellet District Heating 4 th Servite District Heating Scheme 32 Units Heating Analysis via Pick Everard –Building regs 10,200."— Presentation transcript:
Servite HA Inverness Pellet District Heating 4 th Servite District Heating Scheme 32 Units Heating Analysis via Pick Everard –Building regs 10,200 kwh/annum –Target u values 6,600 kwh/annum Walls: 0.18 W/m2K Roof: 0.16 W/m2K Ground Floor: 0.22 W/m2K Windows: 1.4 W/m2K Final SAP average 5200 kwh/annum
Servite H.A. Inverness Pellet District Heating Tenders Fraser and Sun –Tender followed by Negotiated D/B contract –£239,000 –£7,500/unit –Development cost £100,000 over benchmark –£60,000 grant Community Energy Scotland –£40,000 Servite –Completed April 2010
Servite HA Inverness Pellet District Heating Heating System Design –3 blocks of flats –2 boiler houses with 3 Okofen boilers (50kwh output)+ Accumulator Tanks ( 1 Accumulator tank house) –Vital heat meters with radio control and info updated monthly via spreadsheet –Billing based upon monthly service (updated bi-annually) with backup of pre-paid card system for non- payers (updated bi-annually) with backup of pre-paid card system for non- payers Annual Cost estimate £6-700/tenancy Reality based upon 9 months of data probably but Servite charging less so maybe £800/tenancy??
Servite HA Inverness District Heating System W. Heather Rd. secures top mark (Excellent) for Eco-homes evaluation in Scotland: March 2010 W. Heather Rd. wins Scottish Homes Award for best Small Affordable Housing Development: June 2010
Servite HA Inverness Pellet District Heating Contractual Issues –D/B split –Extra over costs of app. 10% Extra heating main pipework due to change in proposed infrastructure runs Assistance with heating sub-contractor Main contractor delays –Lack of specification Quality of workmanship via Fraser and Sun
Servite HA Inverness Pellet District Heating System Performance –CES provision of meters for boilers –CES system test predicts efficiency of 93% District heating mains heat loss –Original efficiency prediction 87% –Reality…. Difficult to confirm due to meter/boiler data inconsistency but probably less than predictions
Servite HA Inverness Pellet District Heating Fuel Supply Chain Issues –Lack of predictable quality –Woodchip –Move to performance based contract –Consider Control of fuel supply chain/woodchip Forestry Investment! Metering Issues –Inconsistent data ?? Meter calibration?? –Control of information Ownership of meter –LIFT properties require deed retaining ownership of meter to enable access for repairs and disconnection
Servite HA Inverness Pellet District Heating Future Direction –Performance related contract for Installation Design/full specification via district heating engineers D/B contract split? District heating + internal heating to be under one roof –Performance related supply chain –Establishment of ESCO? Subsidiary ( Non-Profit) provides heat to HA/others via performance related contract ( i.e. xp/kwh supplied) Subsidiary takes headache of billing etc. off of housing team Subsidiary brings in FEED IN TARIFF, more than making up the difference between benchmark costs and extra over costs of district heating schemes Subsidiary builds up reserves for replacement costs etc.