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Domestic GDA Training 8. Renewables & Microgeneration1Training Material Stroma Certification 2013 | Version 1.1 ABBE Level 3 Diploma in Domestic Green Deal Advice 8. Renewables & Microgeneration Heat Pumps Biomass & Biofuels Solar Thermal Solar PV Wind Turbines Micro CHP Presented by

Domestic GDA Training 8. Renewables & Microgeneration2Training Material Stroma Certification 2013 | Version 1.1 The Measures

Domestic GDA Training 8. Renewables & Microgeneration3Training Material Stroma Certification 2013 | Version 1.1 Renewable Energy Renewable energy is energy which comes from natural resources, naturally replenished. In its various forms, it derives directly from the sun, wind, water or from heat generated deep within the earth. Included is: Electricity and heat generated from solar Wind Ocean Hydropower Biomass Geothermal resources Biofuels Hydrogen derived from renewable resources

Domestic GDA Training 8. Renewables & Microgeneration4Training Material Stroma Certification 2013 | Version 1.1 Passive Solar Design Passive solar design refers to the use of the suns energy for the heating and cooling of living spaces. In this approach, the building itself or some element of it takes advantage of natural energy characteristics in materials and air, created by exposure to the sun. Passive systems are simple, have few moving parts, and require minimal maintenance and require no mechanical systems. Passive design is practiced throughout the world and has been shown to produce buildings with low energy costs, reduced maintenance, and superior comfort. Any design feature that maximises insulation and uses free solar gain will be most cost effective in reducing the energy bills of a building over its whole life span.

Domestic GDA Training 8. Renewables & Microgeneration5Training Material Stroma Certification 2013 | Version 1.1 Passive Solar Design Recognising Passive Design Passive solar design can be recognised by a range of features such as: Double or triple-glazed south-facing windows - which allow infrared radiation to pass through - plus smaller north facing windows to minimise heat loss Light tubes which channel sunlight from an outside roof or wall into a room during the day Trombe walls this is a natural design features which moves air warmed by free solar heat into a space using convection A double-glazed conservatory or a solarium. In hotter months, conservatories can be shaded and naturally ventilated to protect from excess heat and ultraviolet rays. By closing doors at sunset, heat loss is prevented from the main building, using well insulated doors or windows. The need for dynamic simulation modelling put it outside the scope of SAP.

Domestic GDA Training 8. Renewables & Microgeneration6Training Material Stroma Certification 2013 | Version 1.1 Heat Pumps - advice

Domestic GDA Training 8. Renewables & Microgeneration7Training Material Stroma Certification 2013 | Version 1.1 Air Source Heat Pumps Air source heat pumps absorb heat from the outside air. This heat can then be used to heat radiators, underfloor heating systems, or warm air convectors and hot water in your home. An air source heat pump extracts heat from the outside air in the same way that a fridge extracts heat from its inside. It can get heat from the air even when the temperature is as low as --15 C. Heat pumps have some impact on the environment as they need electricity to run, but the heat they extract from the ground, air, or water is constantly being renewed naturally

Domestic GDA Training 8. Renewables & Microgeneration8Training Material Stroma Certification 2013 | Version 1.1 Ground Source Heat Pumps Ground source heat pumps use pipes which are buried in the garden to extract heat from the ground. This heat can then be used to heat radiators, underfloor or warm air heating systems and hot water in the home. A ground source heat pump circulates a mixture of water and antifreeze around a loop of pipe - called a ground loop - which is buried in the propertys garden. Heat from the ground is absorbed into the fluid and then passes through a heat exchanger into the heat pump. The ground stays at a fairly constant temperature under the surface, so the heat pump can be used throughout the year - even in the middle of winter.

Domestic GDA Training 8. Renewables & Microgeneration9Training Material Stroma Certification 2013 | Version 1.1 expansion valve from energy sourcecompressor to energy source return from the heating system to the heating system condenser Heat Pump system Horizontal Closed Ground Loop Vertical Closed Ground Loop Vertical Open Loop Closed Pond Loop Heat Pumps

Domestic GDA Training 8. Renewables & Microgeneration10Training Material Stroma Certification 2013 | Version 1.1 Changing to a Heat pump air source Do you have somewhere to put it? You'll need a place outside your home where a unit can be fitted to a wall or placed on the ground. It will need plenty of space around it to get a good flow of air. A sunny wall is ideal. Is your home well insulated? Since air source heat pumps work best when producing heat at a lower temperature than traditional boilers, it's essential that your home is insulated and draught-proofed well for the heating system to be effective. What fuel will you be replacing? The system will pay for itself much more quickly if it's replacing an electricity or coal heating system. Heat pumps may not be the best option for homes using mains gas. What type of heat emitter will you use? Air source heat pumps can perform better with underfloor heating systems or warm air heating than with radiator- based systems because of the lower water temperatures required.

Domestic GDA Training 8. Renewables & Microgeneration11Training Material Stroma Certification 2013 | Version 1.1 Changing to a Heat pump air source Costs Installing a typical system costs around 6,000 to 10,000. Running costs will vary depending on a number of factors - including the size of your home, and how well insulated it is, and what room temperatures you are aiming to achieve. Earnings You may be able to receive payments for the heat you generate using a heat pump through the governments Renewable Heat Incentive (RHI). This scheme should be launched in Summer 2013.Renewable Heat Incentive For systems installed after 1 August 2011, you may be able to get help with the installation costs of a new air source heat pump through the Renewable Heat Premium Payment scheme.Renewable Heat Premium Payment

Domestic GDA Training 8. Renewables & Microgeneration12Training Material Stroma Certification 2013 | Version 1.1 Changing to a Heat pump Considerations need to be given when changing from a boiler to a heat pump. Specialist calculations are required to determine fabric heat losses and heat emitter sizes. Due to the lower flow temperature of heat pumps compared to boilers, existing radiators may be undersized.

Domestic GDA Training 8. Renewables & Microgeneration13Training Material Stroma Certification 2013 | Version 1.1 Changing to a Heat pump air source Existing system Air source heat pump performing at 220% Air source heat pump performing at 300% Gas/year CO2/year -130 -30kg 110 850kg Electric/year CO2/year 400 4,410kg 650 5,230kg oil/year CO2/year 50 830kg 290 1,660kg Solid/year CO2/year 50 4,610kg 290 5,430kg A negative number means it could cost you more to run the heat pump than the system you are replacing

Domestic GDA Training 8. Renewables & Microgeneration14Training Material Stroma Certification 2013 | Version 1.1 Changing to a Heat pump ground source Is a ground source heat pump suitable It doesn't have to be particularly big, but the ground needs to be suitable for digging a trench or a borehole and accessible to digging machinery. Normally the loop is laid flat or coiled in trenches about two metres deep, but if there is not enough space in your garden you can install a vertical loop down into the ground to a depth of up to 100 metres for a typical domestic home Costs Installing a typical system costs around 9,000 to 17,000. Running costs will depend on a number of factors - including the size of your home and how well insulated it is.

Domestic GDA Training 8. Renewables & Microgeneration15Training Material Stroma Certification 2013 | Version 1.1 Changing to a Heat pump ground source Existing system Ground source heat pump performing at 250% Ground source heat pump performing at 300% Gas/year CO2 -20 400kg 110 850kg Electric/year CO2 510 4,780kg 650 5,230kg Oil/year CO2 160 1,200kg 290 1,660kg Solid/year CO2 160 4,980kg 290 5,430kg

Domestic GDA Training 8. Renewables & Microgeneration16Training Material Stroma Certification 2013 | Version 1.1 Heat Pumps overview Could lower your fuel bills, especially if you replace conventional electric heating. Could provide an income through the governments Renewable Heat Incentive (RHI). Could lower the homes carbon emissions, depending on which fuel is being replaced. Don't need fuel deliveries. Can heat a home and provide hot water. Need little maintenance - they're called fit and forget technology. Lower heat output than conventional system High installation cost Works better with an insulated dwelling Need space externally to fit the unit Performs best with underfloor heating due to lower water temperatures

Domestic GDA Training 8. Renewables & Microgeneration17Training Material Stroma Certification 2013 | Version 1.1 Biomass & Biofuels

Domestic GDA Training 8. Renewables & Microgeneration18Training Material Stroma Certification 2013 | Version 1.1 Biomass Wood-fuelled heating systems, also called biomass systems, burn wood to provide warmth in a single room or to power central heating and hot water boilers.

Domestic GDA Training 8. Renewables & Microgeneration19Training Material Stroma Certification 2013 | Version 1.1 Solid Fuel Biomass Comes in various forms Wood logs Wood chips Wood pellets When biomass fuel is combusted is releases carbon dioxide, but no more than it absorbs whilst the tree grows. Biomass is therefore considered to be carbon neutral Wood pellets and wood chips can be used in biomass boilers. Wood logs are used in open and closed room heaters.

Domestic GDA Training 8. Renewables & Microgeneration20Training Material Stroma Certification 2013 | Version 1.1 Costs A pellet stove will cost around 4,300 including installation. Installing a new log stove will usually cost less than half this, including a new flue or chimney lining. For boilers, an automatically fed pellet boiler for an average home costs around 11,500 including installation, flue, fuel store and VAT at 5%. Manually fed log boiler systems can be slightly cheaper. Pellet costs depend mainly on the size and method of delivery. Buying a few bags at a time makes them expensive. If you have room for a large fuel store that will accept several tonnes of pellets at a time, delivered in bulk by tanker, you can keep the cost down to around 190 per tonne in most parts of the UK. Logs can be cheaper than pellets, but costs depend on the wood suppliers in your local area, as they cost a lot to transport. If you have room to store more than a years worth of logs you can save money by buying unseasoned logs and letting them season for a year.

Domestic GDA Training 8. Renewables & Microgeneration21Training Material Stroma Certification 2013 | Version 1.1 Biomass & Biofuel Boilers

Domestic GDA Training 8. Renewables & Microgeneration22Training Material Stroma Certification 2013 | Version 1.1 Biomass Advantages Affordable heating fuel ( price varies) low-carbon option ( considered carbon neutral) Financial support Variety in fuels ( logs, chips, pellets ) Theoretically inexhaustible fuel source Disadvantages Potential to run out of fuel Flue/chimney will need sweeping regularly Ash needs to be removed from the system periodically Expensive installation cost Storage of fuel is needed Still an expensive source, in terms of producing the biomass Not appropriate for all dwellings

Domestic GDA Training 8. Renewables & Microgeneration23Training Material Stroma Certification 2013 | Version 1.1 Biomass and Biofuel Biomass is normally considered a carbon neutral fuel, as the carbon dioxide emitted on burning has been (relatively) recently absorbed from the atmosphere by photosynthesis and no fossil fuel is involved. The wood is seen as a by-product of other industries and the small quantity of energy for drying, sawing, pelleting and delivery are discounted. Biomass from coppicing is likely to have some external energy inputs, for fertiliser, cutting, drying etc. and these may need to be considered in the future.

Domestic GDA Training 8. Renewables & Microgeneration24Training Material Stroma Certification 2013 | Version 1.1 Biomass Savings in carbon dioxide emissions are very significant - around 7.5 tonnes a year when a wood-fuelled boiler replaces a solid (coal) fired system or electric storage heating. Financial savings are more variable. Fuel replacedExpected savingExpected carbon dioxide saving Electricity630 a year7.5 tonnes a year Oil270 a year3.9 tonnes a year LPG790 a year3.6 tonnes a year Coal270 a year7.7 tonnes a year Gas90 a year3.1 tonnes a year

Domestic GDA Training 8. Renewables & Microgeneration25Training Material Stroma Certification 2013 | Version 1.1 Solar Thermal

Domestic GDA Training 8. Renewables & Microgeneration26Training Material Stroma Certification 2013 | Version 1.1 Solar Thermal What is solar thermal technology? Solar thermal systems heat water using the energy from the sun, which can then be stored for use in domestic, public or commercial buildings. How does it work? A closed circuit of pipes, powered by a digitally controlled pump, transports the heated transfer fluid to a coil in the hot water cylinder, which then stores the heated water for later use.

Domestic GDA Training 8. Renewables & Microgeneration27Training Material Stroma Certification 2013 | Version 1.1 Solar Thermal

Domestic GDA Training 8. Renewables & Microgeneration28Training Material Stroma Certification 2013 | Version 1.1 Solar Thermal Flat Plate Collectors A flat-plate collector consists of an absorber, a transparent cover, a frame, and insulation. Usually an iron-poor solar safety glass is used as a transparent cover, as it transmits a great amount of the short-wave light spectrum.

Domestic GDA Training 8. Renewables & Microgeneration29Training Material Stroma Certification 2013 | Version 1.1 Solar Thermal Evacuated Tube collectors In this type of vacuum collector, the absorber strip is located in an evacuated and pressure proof glass tube. The heat transfer fluid flows through the absorber directly in a U- tube or in counter-current in a tube-in- tube system. Several single tubes, serially interconnected, or tubes connected to each other via manifold, make up the solar collector. A heat pipe collector incorporates a special fluid which begins to vaporize even at low temperatures. The steam rises in the individual heat pipes and warms up the carrier fluid in the main pipe by means of a heat exchanger. The condensed liquid then flows back into the base of the heat pipe.

Domestic GDA Training 8. Renewables & Microgeneration30Training Material Stroma Certification 2013 | Version 1.1 Solar Thermal Costs, savings and earnings The cost of installing a typical solar water heating system is around 4,800 (including VAT at 5%). Savings are moderate - the system could provide most of your hot water in the summer, but much less during colder weather. Supplemented heatingSaving per annumCO2 saving per annum Gas60230kg Electric85500kg

Domestic GDA Training 8. Renewables & Microgeneration31Training Material Stroma Certification 2013 | Version 1.1 Solar Thermal Earnings You may be able to receive payments for the heat you generate from a solar water heating system through the governments Renewable Heat Incentive. This scheme should be launched in Summer 2013. Renewable Heat Incentive From August 2011, you may be able to get help with the installation costs of a new solar water heating system through the Renewable Heat Premium Payment scheme

Domestic GDA Training 8. Renewables & Microgeneration32Training Material Stroma Certification 2013 | Version 1.1 Solar Thermal Installer Requirements To get the most from a solar thermal system, just like solar PV, the collector is best sited on a roof facing from east through west, with south being optimal. The roof structure would need to be in generally good condition( free from defects) and the roof covering intact. The system would need to be compatible with the existing heating system and the solar thermal system sized appropriately to the heating system and the occupants of the property The system will need a thermal storage to enable the heat to be exchanged. so combination boiler systems are not usually used in conjunction with a solar thermal system. Panels would usually fall under permitted development.

Domestic GDA Training 8. Renewables & Microgeneration33Training Material Stroma Certification 2013 | Version 1.1 Solar Thermal Installer Requirements Typical efficiencies for solar thermal will be around 60%, with the majority of the hot water generated in summer. Solar thermal panels even operate in low light conditions (cloudy days) to good effect (1/3 rd ). However in the UK you will always need an axillary heat source. In installing solar thermal there would need to be a enough room for the cylinder.

Domestic GDA Training 8. Renewables & Microgeneration34Training Material Stroma Certification 2013 | Version 1.1 Solar Thermal Sizing The general rule of thumb is half a solar thermal panel per person. Various effects have a impact on the amount of heat the panels are able to produce, e.g.: Orientation Over shading Pitch Location in country

Domestic GDA Training 8. Renewables & Microgeneration35Training Material Stroma Certification 2013 | Version 1.1 Solar Thermal Maintenance Maintenance costs for solar water heating systems are generally very low. Most solar water heating systems come with a five-year or ten-year warranty and require little maintenance. In general you should keep an eye on your system to check that it is doing what it has been designed to do. You should have your system checked more thoroughly by an accredited installer every 3-7 years to have the Pump checked; and Anti-freeze topped up.

Domestic GDA Training 8. Renewables & Microgeneration36Training Material Stroma Certification 2013 | Version 1.1 Solar PV

Domestic GDA Training 8. Renewables & Microgeneration37Training Material Stroma Certification 2013 | Version 1.1 Solar PV Solar PV panels utilise the suns energy and convert it into free, renewable electricity that you can use to power lighting systems and appliances in your home. PV produces electricity by converting sunlight using the photoelectric effect.

Domestic GDA Training 8. Renewables & Microgeneration38Training Material Stroma Certification 2013 | Version 1.1 Solar PV Light (protons) literally knocks electrons out of the semi- conducting material. Most PV is made from Silicon.

Domestic GDA Training 8. Renewables & Microgeneration39Training Material Stroma Certification 2013 | Version 1.1 Solar PV This technology has been used since the late 50s in the space industry to power satellites and since the 70s in solar powered calculators. The first solar powered satellite, launched in 1958, is still in service.

Domestic GDA Training 8. Renewables & Microgeneration40Training Material Stroma Certification 2013 | Version 1.1 Solar PV There are three types of silicon cells: 1.Monocrystalline 2.Polycrystalline 3.Amorphous There are also hybrid PV cells combining a layer of amorphous silicon over a layer of monocrystalline (e.g. Sanyo).

Domestic GDA Training 8. Renewables & Microgeneration41Training Material Stroma Certification 2013 | Version 1.1 Solar PV Monocrystalline Cells Monocrystalline cells are cut from a single crystal of silicon. Cylinders of silicon are sawn into very thin slices called wafers, the thickness of a human hair. Due to the delicate and labour intensive manufacturing process these cells are the most expensive to make. However, they are also the most efficient with a range of 15% to 18%.

Domestic GDA Training 8. Renewables & Microgeneration42Training Material Stroma Certification 2013 | Version 1.1 Solar PV Poly or Multicrystalline Cells Poly or multicrystalline silicon cells are cut from a block of silicon that is made up of a large number of crystals. The cells are completely square unlike monocrystalline cells. Due to the impurities between the crystals those cells are slightly less efficient, having a range of 14% - 15%. However they are cheaper to manufacture.

Domestic GDA Training 8. Renewables & Microgeneration43Training Material Stroma Certification 2013 | Version 1.1 Solar PV Amorphous cells Amorphous cells are manufactured by placing a thick film of amorphous (non- crystalline) silicon onto a wide choice of surfaces. This is flexible and can be mounted onto a curved surface. This is the cheapest form of silicon cell but also the least efficient at 6%-8%. Although less efficient this type of panel may be more efficient in cloudy conditions, this is the type of cell that is used in small devices.

Domestic GDA Training 8. Renewables & Microgeneration44Training Material Stroma Certification 2013 | Version 1.1 Solar PV Operation First the inverter transforms the electricity generated by the panel from direct current (DC) into alternative current (AC). The electricity is then used as normal by the electrical appliances such as lights, computers, fridges etc. When the systems produces more electricity than needed the power is sold back into the grid via an export meter. However when the system doesnt produce enough or no electricity (at night for example), the electricity is imported from the National Grid as normal.

Domestic GDA Training 8. Renewables & Microgeneration45Training Material Stroma Certification 2013 | Version 1.1 Solar PV Optimum Conditions Unlike solar thermal, PV is much more susceptible to variation in performance based on light conditions, and the orientation and pitch of the panels. The 3 factors have an effect on the amount of energy that the system is able to create. Optimum conditions: South facing 30 pitch Unshaded

Domestic GDA Training 8. Renewables & Microgeneration46Training Material Stroma Certification 2013 | Version 1.1 Overshading Overshading extract from SAP

Domestic GDA Training 8. Renewables & Microgeneration47Training Material Stroma Certification 2013 | Version 1.1 Orientation and Pitch

Domestic GDA Training 8. Renewables & Microgeneration48Training Material Stroma Certification 2013 | Version 1.1 Overshading Ideally no overshading should occur. As cells are normally connected in string, a small amount of overshading will affect the whole panel or module. The examples to the right show partial shading that can reduce the module efficiency by 50%.

Domestic GDA Training 8. Renewables & Microgeneration49Training Material Stroma Certification 2013 | Version 1.1 Solar PV Costs Costs The average domestic solar PV system is 3.5 to 4kWp and costs around 7,000 (including VAT at 5%), with the typical cost ranging from 5,500 to 9,500. Costs have fallen significantly over the last year. They vary between installers and products, so we recommend getting quotes from at least three installers

Domestic GDA Training 8. Renewables & Microgeneration50Training Material Stroma Certification 2013 | Version 1.1 Savings A 3.5kWp system can generate around 3,000 kilowatt hours of electricity a year about three quarters of a typical household's electricity needs. It will save over a tonne of carbon dioxide every year. If your system is eligible for the Feed-In Tariff scheme it could generate savings and income of around 645 a year (based on a 3.5kWp solar PV system eligible for a generation tariff of 15.44p/kWh). You will get paid for both the electricity you generate and use, and what you don't use and export to the grid.Feed-In Tariff scheme When applying for FITs you will need to show evidence of your property's Energy Performance Certificate and this will affect what tariff you can get.Energy Performance Certificate

Domestic GDA Training 8. Renewables & Microgeneration51Training Material Stroma Certification 2013 | Version 1.1 Wind Turbines

Domestic GDA Training 8. Renewables & Microgeneration52Training Material Stroma Certification 2013 | Version 1.1 Wind Turbines The UK benefits from some of the highest average wind speeds in Europe, making it an ideal candidate for wind energy. The technology now generates around 2.5% of the UKs electricity and the proportion is increasing rapidly. Between 2007 and 2009 the amount of electricity generated from wind power in the UK increased by over 75% and in 2010 accounted for 58% of all UK renewable electricity generation.

Domestic GDA Training 8. Renewables & Microgeneration53Training Material Stroma Certification 2013 | Version 1.1 Wind Turbines There are two main designs of wind turbine those with a horizontal axis and those with a vertical axis. Most turbines for homes have a horizontal axis whilst they can be mounted directly on a building, turbines mounted on free-standing towers or poles can be more effective at capturing the winds energy.

Domestic GDA Training 8. Renewables & Microgeneration54Training Material Stroma Certification 2013 | Version 1.1 Wind Turbines A typical 1kW building-mounted system costs approximately 2,000. A typical 2.5kW pole mounted turbine costs approximately 15,000. A typical 6 kW pole mounted system costs approximately 23,000. Savings will depend on the turbine type size, local wind conditions, economies of scale and the cost of the electricity being replaced by using the wind turbine. Rural or coastal dwellings can benefit more easily from wind energy as local wind conditions are often good.

Domestic GDA Training 8. Renewables & Microgeneration55Training Material Stroma Certification 2013 | Version 1.1 Wind Turbines Building mounted turbines are a new type of wind turbine designed to be installed directly onto a building. This avoids the costs involved in erected a freestanding tower and foundations. Designs of these systems vary between manufacturers and include both vertical and horizontal axis machines. However, a building mounted turbine will not normally generate as much electricity as an equivalent pole or tower mounted machine. It may also add stress to your homes building fabric due to increased weight and vibrations. You should always seek specialist guidance before installing a building mounted turbine.

Domestic GDA Training 8. Renewables & Microgeneration56Training Material Stroma Certification 2013 | Version 1.1 Micro Combined Heat and Power (CHP)

Domestic GDA Training 8. Renewables & Microgeneration57Training Material Stroma Certification 2013 | Version 1.1 Micro-CHP Micro-CHP stands for micro combined heat and power. Heat your home and generate electricity at the same time with a micro-CHP unit. This technology generates heat and electricity simultaneously, from the same energy source, in individual homes or buildings. The main output of a micro-CHP system is heat, with some electricity generation, at a typical ratio of about 6:1 for domestic appliances.

Domestic GDA Training 8. Renewables & Microgeneration58Training Material Stroma Certification 2013 | Version 1.1 Micro-CHP A typical domestic system will generate up to 1kW of electricity once warmed up: the amount of electricity generated over a year depends on how long the system is able to run. Any electricity generated and not used can be sold back to the grid. It typically costs between 5,000 - 6,000 to have a Micro CHP boiler installed.

Domestic GDA Training 8. Renewables & Microgeneration59Training Material Stroma Certification 2013 | Version 1.1 Micro-CHP - Advantages Electricity generation as a by-product of heat. When the micro-CHP is generating heat, the unit will also generate electricity to be used in your home (or exported). Carbon savings. By generating electricity on-site you could be saving carbon dioxide compared with using grid electricity and a standard heating boiler. Financial income. Micro-CHP is eligible for Feed-in Tariffs and you will earn 11.0p for each kWh of electricity generated by your system. You will also receive 3.2p for each kWh of electricity you export. Easy installation. For the householder, there is very little difference between a micro-CHP installation and a standard boiler. They are roughly the same size. However, the installer must be approved under the Microgeneration Certification Scheme. Servicing costs and maintenance are estimated to be similar to a standard boiler although a specialist will be required.

Domestic GDA Training 8. Renewables & Microgeneration60Training Material Stroma Certification 2013 | Version 1.1 Micro-CHP Disadvantages Micro CHP is a relatively unproven technology. Carbon savings in most smaller, newer domestic properties are insignificant. Micro CHP is inefficient for short run cycles. There is a high incidence of unreliability in currently installed units. On average, 50% of electricity generated in domestic applications is surplus. There is a current shortfall of available export reward tariffs for excess electricity directed to the grid. Current life expectancy of micro-CHP units is reported to be relatively low. High installation costs. Some CHP units are heavy requiring solid flooring. Current payback period is in excess of 20 years, but will reduce along with increased production.

Domestic GDA Training 8. Renewables & Microgeneration61Training Material Stroma Certification 2013 | Version 1.1 Questions?

Domestic GDA Training 8. Renewables & Microgeneration62Training Material Stroma Certification 2013 | Version 1.1 Stroma Certification Ltd. 4 Pioneer Way, Castleford, WF10 5QU 0845 621 11 11 [email protected] Web Links www.stroma.com/certification Contacts

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