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Energy Efficiency
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TARGET ENERGY CONSUMPTION

The target energy consumption for projects is based on Energy Usage Indices complying with good practice as defined in BRE ECON19.

The various energy-saving features incorporated into the design and which can be taken account of in completing the energy usage analysis are summarized as follows:-

"Passive" Building Features
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* * Maximum use of natural ventilation and daylighting
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* * High insulated external walls (U-value < 0.25 W/m2k)
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* * High performance double glazing (U-value < 0.21 W/m2)
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* * Thermally heavy structure with exposed concrete soffits.
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Mechanical System Design
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* * Condensing Boilers on Main Heating Plant
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* * Low Temperature Heating System for Improved Efficiencies
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* * Careful Zoning of the Heating System with Local Controls where applicable
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* * Displacement ventilation system.
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* * Variable Speed Drives on all main Air Handling Plant
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* * Distributed High Efficiency Water Heating
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* * Energy Friendly B.E.M.S.
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* * Use of Local Thermostatic Mixing Valves on Hot Water Outlets
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Use of Percussion Taps and Urinal Flush Controls to Conserve Water

Building Regulations approved document L2 Calculations

BSD have invested in the latest thermal modelling technology and L2 software in order to assist in optimising both new build and refurbishment projects.

Building carbon efficiency calculations as part of building regulations submission.

Minimum energy performance.

Consequential improvements. CO2 Emissions

Target carbon dioxide emissions rate (TER)

Achieving carbon dioxide emission rate (TER)

Solar gains and summer overheating.
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Electrical System Design
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* * High Energy Efficient Lighting
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* * Daylight level lighting controls
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* * Occupancy Detection Lighting Controls
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* * Variable Speed Drives on Mechanical Plant
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* * Low Energy and Power Saving User Equipment
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* * Specification of Low Energy Traction Lifts.
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As the design develops it will be necessary to re-evaluate each of the proposed energy saving features to achieve economic energy targets. In addition the following must be considered:
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1. The figures quoted are "average" based on historical climates data for a "typical" year.
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2. The figures could change significantly if the usage pattern of the building or areas of it differ significantly from those indicated in the brief.
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3. Target energy figures are seldom realized in the first year of a buildings operation, as drying out increases energy consumption and the building operators normally require this period to develop the optimum operational regimes.
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Monitoring of energy consumption to enable realistic targets to be established and agreed is therefore essential. It is proposed that the energy management system should monitor and record energy use for the different areas and functions of the buildings. In addition to assisting with establishing targets, this will enable high energy users to be identified and corrective action taken where possible to ensure the optimum is achieved.
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Designing The Future
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3 Bellsbridge Office Park - Ladas Drive - Belfast - BT6 9FH T: 028 9046 9911 F: 028 9046 9922 E: design@bsdni.com
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