Demonstration of low carbon refurbishment of off-gas homes using Sunergy solar energy system integrated with a prototype heat engine.
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as PDF This ambitious project will look at low carbon whole house refurbishment potential in an off gas property. The proposed strategy will utilise pioneering solar endothermic collector technology by Sunergy accompanied with a prototype heat engine to generate electricity. These innovative technologies will demonstrate advanced collection of solar and ambient heat energy to deliver significant energy and emission reductions for existing housing stock. Suitable energy efficiency measures will be implemented in the property, primarily addressing heat loss, lighting and appliance use. With highly sophisticated remote monitoring, this project will be valuable to measure the performance of the Sunergy system and other low carbon measures.
Retrofit for the future ZA379H
Demonstration of low carbon refurbishment of off-gas homes using Sunergy solar energy system integrated with a prototype heat engine. : 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 | 14979 kWh/yr | 5265 kWh/yr | - |
|---|---|---|---|
| Natural gas use | - | - | - |
| Oil use | - | - | - |
| LPG use | - | - | - |
| Wood use | - | - | - |
| house coal | 4755 kWh/yr | - | - |
| Pre-development | Forecast | Measured | |
| Primary energy requirement | 621 kWh/m².yr | 192 kWh/m².yr | - |
|---|---|---|---|
| Annual CO₂ emissions | 156 kg CO₂/m².yr | 45 kg CO₂/m².yr | - |
| Annual space heat demand | - | 105 kWh/m².yr | - |
Renewable energy
| Electricity generation | Forecast | Measured |
|---|---|---|
| Sunergy system | 1633 kWh/yr | - |
| Heat engine | 2100 kWh/yr | - |
| Electricity consumed by generation | - | - |
| Primary energy requirement offset by renewable generation | 56 kWh/m².yr | - |
| Annual CO₂ emissions offset by renewable generation | 13 kg CO₂/m².yr | - |
Calculation and targets
| Whole house energy calculation method | SAP |
|---|---|
| Other whole house calculation method | Figures relate to SAP Whole House extension values. Application includes outputs from Home Energy Masterplan. |
| Energy target | Retrofit for the Future |
| Other energy targets | Primary energy target 100kWh/m2/yr and Carbon target of only 13Kg/m2/yr. Figures below have been edited, to factor in SAP 2009 carbon facotrs being used. |
| Forecast heating load | - |
Airtightness
| Date | Result | |
| Pre-development air permeability test | - | 9.87m³/m².hr @ 50 Pascals |
|---|---|---|
| Final air permeability test | - | - |
Project description
| Stage | Under construction |
|---|---|
| Start date | 01 February 2010 |
| Occupation date | 01 January 2010 |
| Location | Hawkley Hampshire England |
| Build type | Refurbishment |
| Building sector | Public Residential |
| Property type | Semi-Detached |
| Construction type | Masonry Cavity |
| Other construction type | Filled cavity |
| Party wall construction | Cavity filled |
| Floor area | 68.5 m² |
| Floor area calculation method | Treated Floor Area (PHPP) |
| Building certification |
Project Team
| Organisation | Drum Housing (part of Radian) |
|---|---|
| Project lead person | Drum Housing Association |
| Landlord or Client | Drum Housing Association |
| Architect | - |
| Mechanical & electrical consultant | Sunergy, Jaga |
| Energy consultant | Camco |
| Structural engineer | - |
| Quantity surveyor | - |
| Consultant | A Proctor Group, Parity Projects |
| Contractor | Drum Housing Association |
Design strategies
| Planned occupancy | The residents of this property are a couple in their 30's and their four young children. |
|---|---|
| Space heating strategy | The Sunergy Endothermic system is an innovative hybrid of solar thermal and heat-pump technologies. It comprises of a roofing system that operates as an efficient absorption plate and solar collector, a 'Solar Energy Processor' (with heat exchangers, a heat pump module and circulation pumps) and thermal stores (one for the solar collector and the other for the heat pump). This system provides both space heating and hot water for the dwelling with the controls configured to maximise the output from the solar collector and any top-up being provided by the heat pumps. Secondary heating system will be changed by installing a wood stove. |
| Water heating strategy | The Sunergy Endothermic system is an innovative hybrid of solar thermal and heat-pump technologies. It comprises of a roofing system that operates as an efficient absorption plate and solar collector, a 'Solar Energy Processor' (with heat exchangers, a heat pump module and circulation pumps) and thermal stores (one for the solar collector and the other for the heat pump). This system provides both space heating and hot water for the dwelling with the controls configured to maximise the output from the solar collector and any top-up being provided by the heat pumps. |
| Fuel strategy | Mains electricity, wood logs |
| Renewable energy strategy | The Sunergy Endothermic system is an innovative hybrid of solar thermal and heat-pump technologies. Secondary heating system will be changed by installing a wood stove. |
| Passive Solar strategy | South facing windows, new A rated windows. |
| Space cooling strategy | Natural ventilation for most of the cooling season. |
| Daylighting strategy | Rooms have decent daylight factor, which will be supplemented through low energy and LED lighting. |
| Ventilation strategy | #NAME? |
| Airtightness strategy | The target air permeability rate is proposed by taking out the redundant chimney, infilling blocked door and window openings, blocking redundant air bricks, and use of chimney balloon. Floor insulation and new windows and door tightly fitted. |
| Strategy for minimising thermal bridges | Thermal bridging analysis undertaken for all primary junctions interfaces. Elimination of cold bridging by lining internal surfaces of 11 lintels with thin insulation detail . New insulated lining to inclinded ceilings. Infilling blocked door and window openings |
| Modelling strategy | House modelling was undertaken in using SAP software and whole house calculation. -Also used Home Energy Masterplan software developed by Parity projects. This uses data about building characteristics, resident behaviour and specific appliance use to derive an accurate estimate of the annual energy of the dwelling. The calculation methodology is based on BREDEM8, but uses with supplementary information from sources including CIBSE Guide A to cover aspects such as floor heat losses and appliances. |
| Insulation strategy | -Application of floor insulation (to achieve U-value of 0.23w/m2k for solid floor, and 0.22W/m2k for suspended floor) -Top of loft insulation to 300mm (to achieve U-value of 0.16w/m2k) -New insulated lining to inclinded ceilings |
| Other relevant retrofit strategies | Even the most advanced efficient building fabric and technologies can perform dismally if unaware or untrained occupants undermine their intended use. It is important that residents understand how to optimise usage of the Sunergy system and new heat engine. This project will therefore dedicate resources to educating occupiers and staff at Drum Housing to ensure the full benefits of the refurbishment scheme are realised. The residents are keen to be part of an exciting project that will improve comfort and reduce energy bills. The package of measures has been chosen to minimise disruption, and provision for a decanting allowance has been made only for measures that will cause upheaval, such as the floor insulation. |
| Contextual information |
Building services
| Occupancy | NULL |
|---|---|
| Space heating | NULL |
| Hot water | NULL |
| Ventilation | NULL |
| Controls | NULL |
| Cooking | NULL |
| Lighting | NULL |
| Appliances | NULL |
| Renewable energy generation system | NULL |
| Strategy for minimising thermal bridges | NULL |
Building construction
| Storeys | |
|---|---|
| Volume | - |
| Thermal fabric area | - |
| Roof description | NULL |
| Roof U-value | 0.00 W/m² K |
| Walls description | NULL |
| Walls U-value | 0.00 W/m² K |
| Party walls description | NULL |
| Party walls U-value | 0.00 W/m² K |
| Floor description | NULL |
| Floor U-value | 0.00 W/m² K |
| Glazed doors description | NULL |
| Glazed doors U-value | 0.00 W/m² K - |
| Opaque doors description | NULL |
| Opaque doors U-value | 0.00 W/m² K - |
| Windows description | NULL |
| Windows U-value | 0.00 W/m² K - |
| Windows energy transmittance (G-value) | - |
| Windows light transmittance | - |
| Rooflights description | NULL |
| Rooflights light transmittance | - |
| Rooflights U-value | 0.00 W/m² K |