Innovative Refurbishment Garth House 10 th June 2014 Bicester Town Council.
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Innovative RefurbishmentGarth House
10th June 2014
Bicester Town Council
Alex Towler – BioRegional
Project Manager
Adrian Kite - Ridge
Architect
Rajat Gupta
Oxford Brookes University
Innovative Refurbishment
1. TSB Competition2. Aims and Objective3. Design Team4. Project Programme5. Innovation 6. Internal Insulation7. Secondary Glazing8. Winter Ventilation9. Summer Ventilation10. Result
Innovative Refurbishment
Technology Strategy Board competition challenge to improve the energy efficiency of existing non-domestic buildings
through innovative refurbishments.
Funded by the Department for Energy and Climate Change (DECC)
R+D Project with potential for large scale roll out.
Aims and Objectives
Develop a holistic insulation solution for historic and non-residential buildings combining: internal insulation, secondary glazing and
ventilation strategy for both winter and summer modes.•30% cheaper than traditional methods•37% carbon reduction•58% energy reduction•Improvement in comfort both winter and summer•Minimal disruption to occupants•Use of multi skilled workforce•Monitor and evaluate before and after work
Ridge – Lead DesignerAdrian Kite
Architect – Post Graduate In Energy Efficient BuildingPassive House – low energy designer / TSB Retrofit for the Future
RIBA Conservation Register / Abingdon Council Hall Museum Grade 1 Listed
BioRegional – Project Co-ordinatorAlex Towler
Sustainability Consultant. BioRegional - An environmental charity with a focus on built environment and One Planet Living
Oxford Brookes University – Monitoring and EvaluationProfessor Rajat Gupta
Professor of Sustainable Architecture and Climate Change.Director of the Oxford Institute for Sustainable Development (OISD)
Director of OISD: Low Carbon Building Group
Dr Hu Du Lecturer in Architecture and Building Simulation
OISD: Low Carbon Building Group
Design Team
Kingerlee – Main ContractorLocal Oxford Contractor
TSB / Energy Reduction ExperienceOwn Natural Building Technologies
United House - WHISCERS licenseInternal insulation contractor
BISRIA – Project AssessorIan Orme
Technology Strategy Board Julie Meikle
Design Team
Monitored and Evaluated by Oxford Brookes UniversityWinter Issues
Heating system on continuously in winter - 24hrs / dayHeavy weight structure provides slow response time
Heating system is not zoned. TRV’s not utilised.
Wasted heat loss through walls, single glazing and ground floor.Summer Issues
Council Chambers overheatingConservatory heats up in summer with no opening lights
Sufficient windows not being opened
Existing Building
Competition for funding in two funding phases:•Nov 2012: Phase 1 Application– Innovation Concepts Selected•Phase 1 funding awarded - £20k•Feb – April 2013: Phase 1 Design phase – Desk top study
•Phase 2 funding awarded - £839k•August – Sept 2013: Detail Design•Dec 2013 – March 2014: Construction Period•March 2014 – March 2015: Monitoring Phase.
Project Time Line
Innovation
A 3D laser scanner measures the internal dimensions
of a room. The digital data is then downloaded to anoff-site cutting machine.
The machine cuts the insulation boards with great
accuracy. Software optimises the cut to minimise
wastage.
The boards are delivered to site as a kit and are then
fitted to the walls with the minimum of noise, mess
and disruption.
Internal Insulation• 70mm Kingspan K18 Kooltherm
Insulated plasterboard
• 25mm treated softwood batten on existing plastered walls
• Skirting replaced
• Retain existing window mouldings by stopping insulation before existing window
• Reduced heat loss through walls
• Reduced heat loss through draughts
Internal Insulation
Existing Panelling
Secondary Glazing
Secondary Glazing
Winter Ventilation
Mechanical Ventilation with Heat Recovery (MVHR)
Provides fresh air in winter when:
•windows are not opened sufficiently
•buildings are better sealed removing natural air changes
Provides tempered fresh air without effecting internal temperatures through draughts
MVHR Installation
Second Floor Works
Aerogel Insulation
• Spacetherm C from the Proctor Group• 10 mm areogel• 18mm chip board• K-value 0.014• U-value ca 0.4
Summer Overheating
• Summer overheating potential increases due to internal insulation
• Opening existing windows is key
• Cross ventilation is required
• Conservatory needs opening vents
• Council Chambers heat gain on both sides requires heat dump vents
Summer Ventilation
Summer Ventilation
Passivent
Internal cover grilleControllablemotorised louvre
External weather louvre
Aircool wall ventilator in masonry wall
Proposed Elevations
Result
Warmer in Winter with faster more responsive heating
More efficient use of the existing heating system
Comfortable in Summer with automated natural vent in the Council Chambers
Bright
Good air quality
Happy Occupants
User focused
1+ Years Monitoring Data
Existing building character retained
Handover and Training
Building performance evaluation and Energy modelling
• Pre-refurbishment BPE• Energy assessment • Environmental audit• Occupant feedback
• Modelling post-refurbishment building performance• Energy savings• Avoiding overheating risk in summer
• Post-refurbishment BPE
Objective of BPE
• Evaluate the performance of the refurbished building in terms of energy savings, overheating in summer and the effect of combined ventilation strategies.
• Measure the moisture content of insulation materials in winter.
• Identify the role of occupants in minimising energy use, from full time staff to visitors.
• Increase the understanding of the relationship between intended performance and actual performance in-use.
Pre-refurbishment BPE
BPE methodology
Energy consumption before refurbishment
kWh/m2
Actual gas consumption was calculated based on meter readings between 18/02/2011 and 02/04/2013; Actual electricity consumption was calculated based on readings between 21/07/2011 and 18/07/2013.
Monitoring of environmental conditionsTotal 315 occupied hours in 7 weeks
starting from 18 Feb 2013Office F10 Office F13 Office F19 Office F21 Office G25
Percentage of occupied hours above 24 oC
16% 12% 0% 7% 5%
Percentage within comfort range61% 82% 37% 24% 45%
Percentage of occupied hours below 21 oC
23% 6% 63% 69% 50%
• Strong contrast between the indoor temperatures in office F10 and others. Office F10 is electrically-heated while other offices heated through radiators connected to the gas boiler.
• Electric storage heater in office F10 was continuously on during monitoring period.
• Gas boiler heating system even ran during unoccupied periods such as night-time and weekends.
• CO2 levels (1200 ppm) tend to be higher than desired in office F13.
Thermal imaging surveys
• Heat loss through white pained wall
Feedback from occupants
• Occupants feel cold in winter and hot in summer; Temperature varies during day in summer;
• Air quality is draughty, smelly and stuffy in winter;
• Low overall satisfaction in both winter and summer;
Occupants comment: ‘The heat is never stable. It is either too hot or too cold.' ‘Some area is warmer than others’.
Predicting post-refurbishment building performance
Predicted energy savings
kWh/m2
11%
49%55%
Post- refurbishment BPE
Post-refurbishment BPE methodology(May 2014 - May 2015)
• Review of handover process and commissioning
• Fabric performance: air-permeability, thermography
• Remote monitoring of energy use, environmental conditions
(external and internal) and occupant interaction with windows
• Occupant satisfaction survey using BUS questionnaires
• Technical review of building and equipment performance
• Review of the performance and usability of controls
• Structured interviews with management
Remote monitoring of energy use and environmental conditions
Remote monitoring systems• Energy use (gas and electricity) and sub-metering (5-min data start
from 11/04/2014)
• Moisture levels in fabric (5-min data start from 25/03/2014)
• Temperature, relative humidity (5-min data start from 18/04/2014)
• Indoor CO2 levels as proxy for indoor air quality (5-min data from 26/04/2014)
• Open-close window sensors (from 26/04/2014)
• Heating usage behaviour using i-buttons on radiators (15-min data start from 26/04/2014)
Monitoring following data in every 5-minute
•Total gas usage
•Total electricity usage
•Electricity usage of MVHR and 2 electric water heaters
•Heat output from boiler for space heating
Heat meter and transmitter
Sub-electricity meter and transmitter
Electricity meter and transmitter
Gas meter and transmitter
Energy metering and sub-metering
Moisture monitoring systems
Environmental monitoring systems
CO2 logger
Temperature/RH sensor Solar radiation sensor
Temperature/RH logger
Behaviour monitoring: window opening and heating usage
Temperature logger on radiator
Windows opening logger
Innovative RefurbishmentGarth House
10th June 2014
Bicester Town Council
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