East Midlands Housing Association Project
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as PDF House is 2 up 2 down late 19C back of pavement terrace with side passage, solid walls. Project would fit high level insulation internally, high performance wood sash windows, air sealing, MVHR, and compensate for lost floor space due to insulation with attic pod room built off-site. Gas heating with solar thermal and Wattbox adaptive control (easy for tenants, reduces energy use ~10% and manages solar thermal hot water). New low energy lighting scheme throughout. Property will used by several decant tenants enabling multiple streams of user feedback to be collected. Project has developed integrated design team, much of it East Midlands based. Property is typical of EMHA stock and common across England and Wales.
Retrofit for the future ZA577J
East Midlands Housing Association Project : Project images
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Energy and fuel use
Measured data from renewable generation is not yet available.
Fuel use
| Pre-development | Forecast | Measured | |
| Electricity use | 2808 kWh/yr | 1010 kWh/yr | - |
|---|---|---|---|
| Natural gas use | 32860 kWh/yr | 2814 kWh/yr | - |
| Oil use | - | - | - |
| LPG use | - | - | - |
| Wood use | - | - | - |
| Other Fuel | - | - | - |
| Pre-development | Forecast | Measured | |
| Primary energy requirement | 638 kWh/m².yr | 82 kWh/m².yr | - |
|---|---|---|---|
| Annual CO₂ emissions | 120 kg CO₂/m².yr | 17 kg CO₂/m².yr | - |
| Annual space heat demand | 389 kWh/m².yr | 28.1 kWh/m².yr | - |
Renewable energy
| Electricity generation | Forecast | Measured |
|---|---|---|
| Renewables Technology | - | - |
| Other Renewables Tech | - | - |
| Electricity consumed by generation | - | - |
| Primary energy requirement offset by renewable generation | 82 kWh/m².yr | - |
| Annual CO₂ emissions offset by renewable generation | 17 kg CO₂/m².yr | - |
Calculation and targets
| Whole house energy calculation method | PHPP |
|---|---|
| Other whole house calculation method | - |
| Energy target | Retrofit for the Future |
| Other energy targets | - |
| Forecast heating load | 8 W/m² demand |
Airtightness
| Date | Result | |
| Pre-development air permeability test | - | 15.32m³/m².hr @ 50 Pascals |
|---|---|---|
| Final air permeability test | - | 2.58m³/m².hr @ 50 Pascals |
Project description
| Stage | Design (planning permission granted) |
|---|---|
| Start date | 26 July 2010 |
| Occupation date | 27 August 2010 |
| Location | Leicester Leicestershire England |
| Build type | Refurbishment |
| Building sector | Public Residential |
| Property type | Mid Terrace |
| Construction type | Solid Brick |
| Other construction type | Back of pavement so external insulation not possible |
| Party wall construction | Solid brick |
| Floor area | 70.2 m² |
| Floor area calculation method | Actual Floor Area (SAP) |
| Building certification |
Project Team
| Organisation | East Midlands Housing Association |
|---|---|
| Project lead person | David Shaw, East Midlands Housing Association |
| Landlord or Client | East Midlands Housing Association |
| Architect | Gordon White Hood Consultants |
| Mechanical & electrical consultant | Illuma |
| Energy consultant | A Wright, De Montfort University |
| Structural engineer | Gordon White Hood Consultants |
| Quantity surveyor | Gordon White Hood Consultants |
| Consultant | Gordon White Hood Consultants |
| Contractor | Aqua Interiors; Vanguard Homes |
Design strategies
| Planned occupancy | Three or four people. Occupancy will vary during evaluation as it is a decant property for multiple tenants, with an unknown tenant at the end of the trial period. |
|---|---|
| Space heating strategy | Minimise heat loss. Provide with condensing gas boiler (well understood, low carbon, reassures tenants) which could be replaced with other sources such as district heating (Leicester likely to expand its system) in the future. |
| Water heating strategy | Solar hot water with efficient evacuated panels, supplemented by gas boiler when needed especially winter. |
| Fuel strategy | Mains Gas. Mains electricity. |
| Renewable energy strategy | None. Urban micro wind is not effective. Photovoltaic considered but too expensive to be cost-effective. |
| Passive Solar strategy | No options to increase this due to form of property (terraced, facing east/west on exposed facades. Street scene precludes increasing glazing. |
| Space cooling strategy | Natural ventilation for most of the cooling season. Daytime use of MVHR with night purging during heat waves. Would expect little overheating due to high thermal mass, low solar gain and midlands climate. |
| Daylighting strategy | Daylighting largely restricted to what is already there, see Passive Solar Strategy |
| Ventilation strategy | Comfort ventilation with heat recovery throughout the year, and openable windows (summer). MVHR system has automatic valves to avoid unwanted heat recovery. |
| Airtightness strategy | Walls, roof and floor have airtight membranes joined to create near-airtight envelope. Sealing around new doors and windows. |
| Strategy for minimising thermal bridges | Thermal bridging analysis undertaken for all primary junctions interfaces. Internal insulation prevents thermal bridges of most elements such as lintels. Floor/wall, wall/roof detailling to avoid bridging. Aim for no significant thermal bridging throughout. |
| Modelling strategy | Whole house modelling was undertaken in PHPP. SAP only used for required inputs for competition. |
| Insulation strategy | Application of internal insulation to solid brick walls ( to achieve U-value of 0.12 W/m2K ); Dig out solid floor and replacement with solid insulated floor ( to achieve U-value of 0.12 W/m2K) ; Addtion of pod with insulation of 0.12 warm roof. Remaining roof; renewal of existing roof and placement of insulation between and under existing rafters ( to achieve U-value of 0.10 W/m2K). |
| Other relevant retrofit strategies | Pod installation to replace lost floor space and provide extra room - culturally preferred in local area. Decent homes work integrated with retrofit (not included in costs). Adaptive controller (Wattbox) to improve heating efficiency and optimise use of solar thermal (10% - 15%). Vphase voltage control to save electricity (~10%). |
| Contextual information | External insulation precluded by back-of-pavement, terraced situation. Multiple tenants provides more than one set of feedback on success of retrofit, controls etc. |
Building services
| Occupancy | Will vary as this is a decant property for transitional tenants, likely to be typically 2 - 4 people. |
|---|---|
| Space heating | SEDBUK A-rated mains gas condensing boiler. Boiler. |
| Hot water | From boiler with tank, assisted by solar thermal. |
| Ventilation | MVHR system from Itho. |
| Controls | Innovative Wattbox control system which learns user behaviour.Vphase voltage control to 220 V throughout house, shown to save 8.7% of electricity in recent tests in Manchester. |
| Cooking | New cooker, gas hob, electric oven. |
| Lighting | Low energy lighting from Illuma. |
| Appliances | A+/++ Rated fridge, freezer and washing machine |
| Renewable energy generation system | Solar thermal. |
| Strategy for minimising thermal bridges |
Building construction
| Storeys | 3 |
|---|---|
| Volume | - |
| Thermal fabric area | - |
| Roof description | Pitched timber roof, slate tiles, insulated. |
| Roof U-value | 0.10 W/m² K |
| Walls description | Solid brick + internal insulation. |
| Walls U-value | 0.12 W/m² K |
| Party walls description | Solid brick. |
| Party walls U-value | 2.10 W/m² K |
| Floor description | |
| Floor U-value | 0.00 W/m² K |
| Glazed doors description | |
| Glazed doors U-value | 0.00 W/m² K - |
| Opaque doors description | Solid wooden doors |
| Opaque doors U-value | 0.00 W/m² K installed |
| Windows description | |
| Windows U-value | 0.00 W/m² K - |
| Windows energy transmittance (G-value) | - |
| Windows light transmittance | - |
| Rooflights description | |
| Rooflights light transmittance | - |
| Rooflights U-value | 0.00 W/m² K |