Leeds Metropolitan University Portland Gate Development - Phase 1 Building Building Sustainability Design Statement

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1 Leeds Metropolitan University Portland Gate Development - Phase 1 Building Building Sustainability Design Statement

2 Leeds Metropolitan University Portland Gate Development - Phase 1 Building Building Sustainability Design Statement December 2005 This report takes into account the particular instructions and requirements of our client. It is not intended for and should not be relied upon by any third party and no responsibility is undertaken to any third party New Oxford House, 30 Barkers Pool, Sheffield S1 2HB Tel +44 (0) Fax +44 (0) Job number

3 Contents Page 1 Introduction 1 2 Sustainable Construction Flexibility Adaptability Materials Deconstruction Water Management and Usage Drainage Systems 3 3 Energy Efficiency Building Form, Massing and Orientation Comfort Conditions Building Fabric Building Systems Renewables Benchmarks and Targets 5 BUILIDNG SUSTAINABILITY DESIGN STATEMENT-ISSUE1 DEC05.DOC

4 1 Introduction Creating a Sustainable Development requires a process of design which strives towards creating an equilibrium between the needs of mankind and the capacity of the world which we inhabit. In practical terms this means simultaneously addressing social, economic and environmental aspects. The Proposed Portland Gate Development for Leeds Metropolitan University is an opportunity to fully exploit this process of design. The University has a desire for the sustainability performance of this building to be best practice, and to demonstrate this intends to use the BREEAM to benchmark the design. The University aspires to a BREEAM excellent rating, and has appointed an assessor to work with the Design Team at the next stage in order to progress this. This report describes a number of sustainable and energy efficiency aspects which are currently included in the outline scheme. The purpose is to demonstrate to planners that the University and the Project Team are including energy and sustainability as a major aspect of the design process. Page 1

5 2 Sustainable Construction 2.1 Flexibility The majority of the floor space on the upper floors will be used for offices and as teaching rooms. The construction and servicing of the building will be such that partitions can be relocated to accommodate changes in the University requirements, for example more cellular office space, more/less teaching rooms. 2.2 Adaptability The building floor to floor heights, services voids and risers have been selected such that the building could be adapted to a standard office arrangement. The provision of comfort cooling in most areas means that the building can be expected to cope with the increases in external temperatures currently anticipated as a result of climate change. 2.3 Materials The Green Guide to Specification is to be used as a reference to assist in the selection of materials and building systems. The objectives of the use of this document are:- Where performance and quality are not compromised materials should be locally sourced. Where performance and quality are not compromised materials should be recyclable. Recovered materials i.e. plastic tubing, should be used where it is applicable to do so. Wherever possible the building design and materials used should demand low maintenance 2.4 Deconstruction The structural fabric of a building presents a number of opportunities for reuse and recycling:- Concrete can be crushed and re-used as aggregate in recycled concrete. Brickwork, blockwork and concrete can be crushed and used as capping or fill material for road construction. Steelwork can be re-used if appropriate and recycled if a new use cannot be found. Timber elements can be re-used. In order to assist in the effective re-use and recycling of the building a number of actions are advised to assist in the deconstruction, sorting and classification of recyclable material:- Steel elements should be marked with a durable and distinguishing erection mark, section size, steel grade and manufacturer s test certificate number in such a way as not to damage the material. The H&S file should contain information relating to concrete composition and strength as well as masonry grade so its suitability for re-use and recycling is more easily determined. Page 2

6 Connections within steel framed elements of the building should be bolted as far as practicable to allow easy dismantling of the structure, retaining elements whole and without damage. 2.5 Water Management and Usage The reuse of rainwater for the purpose of flushing toilets and urinals is being considered and a cost option provided during the next design stage. All sinks and wash hand basins are to have taps under PIR control, with the exception of the commercial kitchen areas and cleaners stores. Flow regulators will be provided on all outlets. Automatic control of urinal flushing will be provided. 2.6 Drainage Systems This aspect is covered in detail in the Preliminary Drainage Report also submitted in support of this planning application. Page 3

7 3 Energy Efficiency 3.1 Building Form, Massing and Orientation The orientation of the building and glazed elements of the building will be designed to reduce the heating energy use of building by the collection of useful solar gain. The shading and ventilation strategy will be such that any non-airconditioned spaces in the building do not overheat as a result of such solar irradiance. 3.2 Comfort Conditions The building is primarily comfort cooled with mechanical ventilation. This treatment will maintain internal temperatures within set boundaries and prevent overheating in the summer months. Design criteria for the temperature conditions are relaxed within the atrium zone and interlinking open plan areas, this has enabled the use of natural ventilation through motorised openings within the façade and ETFE roof. 3.3 Building Fabric U values will meet at least the performance of the Building Regulations Part L. The building will be subjected to an air tightness test, and a maximum leakage rate of 5m³/hour/m² at 50Pa is to be targeted. Draught lobbies to external doors will be draught proof to all external openings, and provision of controllable trickle ventilation to all non-mechanically ventilated areas will be provided. 3.4 Building Systems All mechanical systems will be specified to be as energy efficient as economically feasible and as part of the design process, we will investigate the viability of energy saving measures and other low carbon and zero carbon technologies. Heating demand should generally be low, due to the following design characteristics; Heat recovery on the air handling units will reduce the energy required to heat the incoming outside air in winter and midseason. Good levels of insulation and air tightness will mean that fabric heat loss and infiltration heat loss will be minimal. Passive ventilation cooling will be implemented where possible, particularly in areas with large areas of glazing (e.g. the atrium space). The chillers will be selected for refrigerant with low ozone depletion potential. In order to meet the design criteria with regard to comfort conditions, it is expected that mechanical ventilation and comfort cooling systems will be provided for many of the spaces/zones. The air supplied will be tempered and top-cooled as required, utilising heat recovery, LPHW heating coils and chilled water cooling coils in the air handling unit. The provision of comfort cooling in most areas means that the building can be expected to cope with the increases in external temperatures currently anticipated as a result of climate change. The air-handling units will be fitted with variable speed inverter driven supply and extract fans. This will facilitate accurate commissioning and provide economic plant operation. Each Page 4

8 lecture theatre will have VAV (variable air volume) control in order to reduce unnecessary fan and air treatment energy use. Control methods on lighting installations including presence detection, luminaire regulation in relation to daylight levels and high frequency dimmable ballast/control gear will significantly reduce the energy consumption. A digital Building Management System (BMS) will be provided to control and monitor all the mechanical services equipment and any motorised opening windows/dampers used for natural ventilation. 3.5 Renewables A number of energy sources, including renewable energy, have been investigated. The Project Team has set aside a budget for the provision of some renewable energy production to be integrated into the Phase 1 building design. This is expected to take the form of hybrid polycrystalline and thin-film PV panels on the roof. 3.6 Benchmarks and Targets The building will be designed in order to achieve carbon emissions targets which, when balanced with other environmental aspects, allows the building design to achieve a BREEAM rating of excellent. A BREEAM assessor has been appointed by the University to assess the scheme and provide design advice at the next design stage. This building will be designed in accordance with the new edition of Approved Document Part L2 Conservation of fuel and power. The new regulations are due to be implemented in April 2006 and the current draft Approved Document suggests that new non-domestic buildings will need to produce in the order of 25% less CO 2 than the equivalent building built to the existing Part L standards. Page 5