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Renewable Energy in Practice. The Energy Statement for Ashton Green Sustainable Urban Extension looked into possibilities of using multiple renewable energy technologies in order to support a planning application. The main areas are energy deductions in

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Introduction

10th of September 2011 Assignment B: Renewable Energy in practise Index: Introduction 2 Solar photovoltaic technology 5 Solar Thermal technology 5 Heat Pumps 7 Wind 9 Biomass 10 Conclusion 11 References 12 Introduction The renewable energy has been and is still being introduced to the practise to achieve main aims and targets of policies introduced by UK and EU government. The current energy policy in UK is set out in the Energy White Paper and Low Carbon Transition Plan. The White Paper was introduced in 2007 and the Low Carbon Transition Plan in 2009. The plans are led by the Department of Energy and Climate Change. The first mentioned plan (White Paper) sets out the Government's international and domestic energy strategy to address the long term energy challenges faced by UK. The main aims are to cut CO2 emissions by 60% by 2050 with a real progress by 2010; to maintain reliable energy supplies; to promote sustainable market in UK and to ensure that every home is heated adequately and affordably. The UK is committed to delivering its share of the EU target for 20% of energy from renewable sources by 2020. Achieving our targets could provide �100 billion worth of investment opportunities and up to half a million jobs in the renewable energy sector by 2020. 50% of all our energy is used for heating and hot water and 75% of domestic households' energy consumption is for heating and hot water. The UK's renewable energy strategy aims for 12% of heat to come from renewable sources. Currently under 5% of UK electricity comes from renewable sources. It is estimated that 30% of our electricity may be delivered from renewables with 2% from small-scale electricity generation. Low Carbon Building Program(LCBP) The Government introduced many plans to achieve the above targets. One of the first was the Low Carbon Building Program (LCBP) and Phases 1, 2 and 2e. ...read more.

Middle

Air-source heat pumps have been also suffering from a bad press due to the under-sizing and bad designs. They were also very noisy and low efficient. However the air-source heat pump manufacturers have improved the technology in last couple of years and some of them are really good with a seasonal coefficient of performance (COP) between 3.2-3.8. There are 2 common types of air-source (water based) heat pumps. Mono-blocks and split versions. Each of the type is divided into a low temperature and high temperature (generates up to 65 with mono-blocks and up to 80 with split versions degree of Celsius flow temperature with no need of an electric element). Mono-blocks are commonly used for new builds with low heat losses and low water flow temperature based heating (under-floor heating, low heat convectors, fan-coils). The mono-block heat pump benefits for the fact that there is no need of refrigerant pipework and an internal unit. The downside of this heat pump is that the heat pump needs to be close to the internal heat exchanger (usually up to 2.5 metres) otherwise there are huge heat losses during the heat transfer (usually around 15 degree of Celsius) between the external unit and the internal hot water/accumulation tank. It means that the heat pump needs to run more frequently and therefore it becomes more expensive to run it. The second type - split version - is becoming more popular. The heat pump has to have minimum of two units, one outdoor (evaporators) and one indoor. The outdoor unit is connected to the indoor unit with refrigerant pipework (the most common refrigerants are R410A and R407C - both environmentally friendly). The indoor unit through a heat exchanger distributes the heat to a heating circuit, accumulation or hot water tank. The heat loss during the heat transfer is between 2-3 degree of Celsius. There are also some downsides of the system. ...read more.

Conclusion

Other places where these systems would be optimal are hospitals and prisons, which need energy, and heat for hot water. These systems are sized so that they will produce enough heat to match the average heat load so that no additional heat is needed, and a cooling tower is not needed. I have already mentioned the Code 6 job which the company I work for was involved and there has been used a communal biomass boiler heating system. Conclusion The Energy Statement for Ashton Green Sustainable Urban Extension looked into possibilities of using multiple renewable energy technologies in order to support a planning application. The main areas are energy deductions in terms of CO2 emissions and sustainability standards. The requirement was a level code 4 of Sustainable homes which means that energy generated for the each dwelling must be 44% above the PART L 2006. The local policies also require a 14% contribution to total energy demand from renewable generation in 2010. The report also identifies incentives for Renewable energy which I have already describes. The report also considered technically feasible the integration of heat pumps, solar thermal, PV, CHP and Biomass. The report comes up with two strategies. The first is based on solar thermal and PV system and the second is based on gas CHP and biomass community heat and power. They are not considering installing of small wind turbines. I would personally prefer either the option one and use solar thermal and PV to achieve The CODE but I would also incorporate heat pumps. The reason why I would not recommend using gas CHP and biomass is the rising cost of the wood pellets/wood chips as well as the gas. The development would also be dependent of third party suppliers. There will also be higher maintenance cost and more mechanical parts involved. Overall I would suggest using heat pump with a combination of solar thermal and PV. I would also not rule out the option of a small (10kw) wind turbine. ...read more.

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