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Bath & North East Somerset Council, Keynsham Civic Centre Sustainability, Energy at Home, Keynsham Civic Centre Tour 16 June 2015
1. Bath and North East Somerset โ The place to live, work and visit
Keynsham Regeneration Project
Sustainability
2. Bath and North East Somerset โ The place to live, work and visit
Keynsham Town Hall
Scope of the Project
ยป Offices for 680 of B&NES and Partner staff
ยป Library and One Stop Shop
ยป Circa 20,000ft2 of retail
ยป Enhanced public realm
ยป Highway improvements
ยป Chance to provide community leadership in cutting carbon
emissions
3. Bath and North East Somerset โ The place to live, work and visit
BREEAM or DEC
BREEAM Assessment
ยป 10 Sections within the overall assessment
ยป Only 1 section relates to Energy
ยป Of this section maximum score is 35 yet only 15 relate to CO2 reduction
ยป Points for Bat Boxes, Wildflower meadows, Consultation strategy etc
ยป Experience of Very Good rated building using more energy than Victorian Buildings
Display Energy Certificate (DEC)
ยป From the 1st January 2009, public bodies occupying buildings over 1,000m2 are
required to exhibit a DEC
ยป The DEC is based on the measured energy use, where the actual energy consumed in
the building is compared to a benchmark for similar buildings
ยป DEC โAโ Rating = CO2 emissions 75% less than the benchmark building
ยป Up to Feb 2010 only 13 out of 3,230 offices certified achieved a rating of A (0.4%)
4. Bath and North East Somerset โ The place to live, work and visit
Project Aims
Sustainability Aims
โข Display energy Certificates (DEC) are based upon the actual energy
usage of the building and all public buildings above 1000m2 require one
โข Aim is a DEC โAโ Rating = CO2 emissions 75% less than the
benchmark building
โข For a general office building the benchmark CO2 emissions figure is
75.1 kgCO2
โข DEC โAโ Rating = < 18.775 kgCO2
5. Bath and North East Somerset โ The place to live, work and visit
Sustainability Matrix
6. Bath and North East Somerset โ The place to live, work and visit
Reducing Energy Use = Less Renewables Required
โข Use passive measures to reduce the energy consumption of the
building. Improve insulation & air-tightness, utilise daylight & natural
ventilation whenever possible.
โข Use high efficiency, low energy systems and equipment. Variable
speed pumps and fans etc. Recover waste heat off IT servers
โข Finally add in renewable energy sources to offset energy use.
7. Bath and North East Somerset โ The place to live, work and visit
Passive Design
โข Building orientation to maximise daylight and
minimise solar gain
โข Glazing on North and South elevation,
shading on East and West
โข Building height and floor layout designed to allow
fresh air to move freely essential for natural
ventilation
โข Airtightness and levels of insulation
8. Bath and North East Somerset โ The place to live, work and visit
Ventilation
โข Natural ventilation avoids large fans and ductwork
โข Healthier internal environment
โข 50% of the energy of A/C building
Lighting (30% of the building energy use)
โข Maximise daylighht so this is adequate for 70% of normal working day
โข Low energy light fittings
โข Simple local control
Heating / Cooling
โข High levels of air tightness (Use of CLT frame solution)
โข High levels of insulation
โข Use recovered heat from IT servers
โข Building orientation, solar controlled glazing and thermal mass
9. Bath and North East Somerset โ The place to live, work and visit
Ventilation
โข It is a general rule that the energy use of a naturally ventilated building should be around
half that of an equivalent air-conditioned building.
Stack Vent
10. Bath and North East Somerset โ The place to live, work and visit
Acoustic Issues
Acoustic Survey Noise Maps
Restrictions to Natural Ventilation Strategy
11. Bath and North East Somerset โ The place to live, work and visit
Thermal Comfort
โข Thermal mass is required to regulate the building temperature peaks.
โข For the thermal mass material to absorb heat it needs to be cooler than the room air in the
day and for it to release heat it needs to be hotter than the room air at night.
โข Exposed concrete soffits are generally the best form of thermal mass. Heat rises and so is
best absorbed at high level, the ceiling can be cooled to a lower temperature than the floor
and provide more effective radiant cooling.
12. Bath and North East Somerset โ The place to live, work and visit
Carbon Assessment
โข Heating & HW: 38kWh/m2/yr = 7.54kgCO2/m2
โข Electrical Base load: 14kWh/m2/yr = 7.23kgCO2/m2
โข IT & Small Power: 41kWh/m2/yr = 21.2kgCO2/m2
โข Emissions excess of 17.22kgCO2/m2 above DEC โAโ Rating.
โข Total CO2 savings required is 113,150 kgCO2.
โข Eliminating the Heating & HW load and Electrical Base Load will not provide
the necessary CO2 savings.
โข The IT and Small Power load has to be addressed.
13. Bath and North East Somerset โ The place to live, work and visit
ICT Strategy
โข ICT currently accounts for an estimated 59% of the building CO2
emissions.
โข Reducing this load is the top priority in order to achieve a DEC โAโ
Rating.
Thin Client
โข Software, data, and CPU power resides on a network server rather than
on the client computer. Studies have shown a 50% decrease in power
consumption.
โขOpportunity to recover heat from main servers to act as a heating source
for the building
โขEach desktop devices reduced its power consumption by 90% compared
to a PC
14. Bath and North East Somerset โ The place to live, work and visit
PV Installation
ยป 750 solar panels on the main office roof
ยป Cover an area equivalent to more than 4 tennis courts
ยป Generate over 230,000 units of electricity each year,
equivalent to the annual energy use of almost 70
homes.
ยป This will reduce annual CO2 emissions by 125 tonnes.