85 Highbury Park report PDF - Greater London Authority

ased on the notional building (which would relate to building regulations 2002) as this is not clearfrom the energy strategy.46 Energy efficiency and conservation measures are applied beyond that normally incorporatedinto a 2006 Building Regulations compliant design. This incorporates measures such as improvedair permeability, solar shading, thermal mass, U-values and best practice passive building design.Overall energy efficiency measures proposed for development exceed Building Regulations,resulting in a total reduction in CO2 (kg/yr) emissions of approximately 8%, compared to thebaseline building.Be Clean: District heating, CHP and cooling47 The applicant has identified three existing combined heat and power (CHP) schemes inIslington. The closest is 1.3 miles away at Barnsbury Park, but connection would be prohibitive onthe basis of cost. The remaining two schemes at Kings Cross and Charterhouse Street are furtherfrom the scheme and as such are not viable for the same reasons. The applicant has committed toensuring that pipes are taken to the perimeter of the site to allow for connection to other if thepossibility arises.48 The energy proposals for this scheme should, as a minimum, demonstrate that a commondistrict-heating network linking all units in the development would be used to supply the spaceheating and hot water requirements of the site. For that purpose an indicative heat networkshowing which spaces would be connected to the proposed heat network should be proposed.49 The applicant proposes renewable CHP running on biodiesel fuel. The proposed capacity is50 kW thermal output. If similar size CHP was run on natural gas, an 18% reduction could beachieved over and above the reductions. There are concerns regarding the use of biodiesel thatthe applicant should address before this could be considered a robust strategy, especially withregards to the fuel, its source and the equipment proposed. Additionally, the CHP manufacturer’swarranty for the use of the proposed liquid biofuel in the CHP engine chosen should be provided,as well as details of the CHP engine to be used. Evidence should be provided that the choice offuel will not compromise the ongoing operation and maintenance cover for the engine. It would beuseful for the applicant to investigate and discuss the commercial viability of the biodiesel CHPwith the GLA’s energy officers.50 The applicant has indicated that techniques for passive solar design have been consideredon site, with the majority of dwellings being dual aspect allowing for natural ventilation. Thedwellings will receive good natural lighting, and windows with a south aspect have beenmaximised, whilst ensuring that overheating in the summer does not occur. The site benefits froma large number of deciduous trees, which provide good natural shading during the summer.Metropolis Green undertook a summer overheating analysis, which indicated that 8% of the sampleis expected to have a medium likelihood of summer overheating, with the other 92% of sampledwellings expected to have a slight likelihood of summer overheating. The report included severalrecommendations to help further minimize overheating, including improving the thermal massparameter (TMP) from 7.0 to 11.0, making use of external shutters and the use of solar controlglazing, and the applicant has committed to incorporating some or all of the recommendations.The report concludes that if the recommended measures are applied, the dwellings will be unlikelyto experience summer overheating in the near future. This approach is welcomed, however theapplicant should consider where in the development there would be a need for active cooling, andhow this would be provided.page 9