WARM officeEntered as test to understand Silver standard requirements
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as PDF Upgrade of a 1960s first floor flat to EnerPHit Passivhaus retrofit standard
WARM officeEntered as test to understand Silver standard requirements : 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 | - | 2290 kWh/yr | 1835 kWh/yr |
|---|---|---|---|
| Natural gas use | - | 3410 kWh/yr | 1131 kWh/yr |
| Oil use | - | - | - |
| LPG use | - | - | - |
| Wood use | - | - | - |
| Other Fuel | - | - | - |
| Pre-development | Forecast | Measured | |
| Primary energy requirement | - | 119 kWh/m².yr | 73 kWh/m².yr |
|---|---|---|---|
| Annual CO₂ emissions | - | 25 kg CO₂/m².yr | 16 kg CO₂/m².yr |
| Annual space heat demand | - | 16 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 | 119 kWh/m².yr | 73 kWh/m².yr |
| Annual CO₂ emissions offset by renewable generation | 25 kg CO₂/m².yr | 16 kg CO₂/m².yr |
Calculation and targets
| Whole house energy calculation method | PHPP |
|---|---|
| Other whole house calculation method | - |
| Energy target | AECB Silver |
| Other energy targets | - |
| Forecast heating load | 20 W/m² demand |
Airtightness
| Date | Result | |
| Pre-development air permeability test | 01 July 2013 | 15m³/m².hr @ 50 Pascals |
|---|---|---|
| Final air permeability test | 02 June 2014 | 0.59m³/m².hr @ 50 Pascals |
Project description
| Stage | Occupied |
|---|---|
| Start date | 01 April 2014 |
| Occupation date | 01 October 2014 |
| Location | Plymouth Devon England |
| Build type | Refurbishment |
| Building sector | Commercial |
| Property type | End Terrace |
| Construction type | Masonry Cavity |
| Other construction type | PUR foam to cavity and EWI added |
| Party wall construction | |
| Floor area | 81 m² |
| Floor area calculation method | Treated Floor Area (PHPP) |
| Building certification |
Project Team
| Organisation | Warmhomes |
|---|---|
| Project lead person | peter warm |
| Landlord or Client | WARM: Low Energy Buildings Practice |
| Architect | Bob Woffenden RIBA |
| Mechanical & electrical consultant | WARM |
| Energy consultant | WARM |
| Structural engineer | |
| Quantity surveyor | |
| Consultant | |
| Contractor | warmhomes |
Design strategies
| Planned occupancy | Office space for up to 12 people |
|---|---|
| Space heating strategy | Existing gas condensing boiler but half of radiators removed |
| Water heating strategy | Existing gas condensing boiler |
| Fuel strategy | Existing gas boiler and mains electric |
| Renewable energy strategy | None. Demand reduction primary aim |
| Passive Solar strategy | Passivhaus |
| Space cooling strategy | Night cooling |
| Daylighting strategy | Remove internal walls to form open plan office with better daylightingSwept reveals to windows |
| Ventilation strategy | MVHRDesign to avoid commisssioning |
| Airtightness strategy | Various - ended up PUR foam to cavity walls |
| Strategy for minimising thermal bridges | Good design!EWI, rafter insulation and good windwo installation details |
| Modelling strategy | PHPP |
| Insulation strategy | EWI and rafter insulation and triple glazing |
| Other relevant retrofit strategies | |
| Contextual information | Was a flat, occupants complained couldn't afford to heat due to draughts. First air test off the scale, retrotec yellow fan could not meet 50 Pa.Ground floor is shop (Ferry Stores), EWI and triple glazing carried down to shop. |
Building services
| Occupancy | 8 at present |
|---|---|
| Space heating | as existing but with half of rads removed |
| Hot water | Existing gas condensing combi |
| Ventilation | MVHR |
| Controls | roomstat, no time control |
| Cooking | Existing electric oven and hob |
| Lighting | 5ft T5 hi frequency fittings, and led conversions to down lighters |
| Appliances | A rate fridge without freeze compartment |
| Renewable energy generation system | |
| Strategy for minimising thermal bridges | Good Design! |
Building construction
| Storeys | 1 |
|---|---|
| Volume | 372m³ |
| Thermal fabric area | 279 m² |
| Roof description | New roof as Grove cottage: strip roof; OSB layer; Airtightness layer; 300mm I beams and insulation; breather membrane, battens, replace tiles |
| Roof U-value | 0.13 W/m² K |
| Walls description | existing cavity walls filled with PUR foam and 200mm neopor EWI |
| Walls U-value | 0.12 W/m² K |
| Party walls description | 25mm laminated plasterboard (18mm insulation 0.022 W/mK) |
| Party walls U-value | 0.75 W/m² K |
| Floor description | Ground: 100mm PIR and floating OSB T&G on existing concrete floorUpper party to shop: Remove services; warmcell injection, airtightness layer sealed to skirtings; T&G OSB floating floor. |
| Floor U-value | 0.20 W/m² K |
| Glazed doors description | Rational Aura plus with triple glazing |
| Glazed doors U-value | 1.23 W/m² K uninstalled |
| Opaque doors description | |
| Opaque doors U-value | - - |
| Windows description | Rational Aura plus |
| Windows U-value | 1.19 W/m² K - |
| Windows energy transmittance (G-value) | 0.51 % |
| Windows light transmittance | - |
| Rooflights description | |
| Rooflights light transmittance | - |
| Rooflights U-value | - |