network strategy report - solar technologies ongoing building sector changes: social and economic...

Network Strategy Report - Solar TechnologiesNetwork Strategy Report - Solar Technologies

Ongoing building sector changes: social and economic factors 10% of total energy for heating and DHW now from solar energy Energy technologies:

– mature, available, economic

– technologies under development

– technology gaps, future research priorities Exemplars: good energy technologies + good architecture Exemplars: reinforce public appreciation of benefits Retrofit market: new buildings only 1% - 2% of building stock Residential sector:

– benefits for single family housing are clear

– potential in large scale residential is large - needs emphasis


Rising electricity demand - especially in commercial buildings Construction costs of ‘lean’ (low energy heating, cooling, and

daylighting) buildings comparable with conventional Design costs will fall as experience is gained Local / regional initiatives:

– sustainability policies

– balanced spatial planning, mix of uses, public transport

– district heating, cooling

– exemplary, energy-efficient public buildings European Union

– EU-wide action plan

– legislative changes trigger surges in technology uptake


Bench-marking– building codes that reflect environmental costs

– district level targets - flexibility in options for compliance

Quality control– building codes provide rules but don’t define reality - Q.C. needed

– emphasis on actual performance rather than systems installed

– provide feedback on performance and facilitate comparison with predicted performance and with other buildings

– which concepts work best and why? Further research Retrofitting


Further research– research not limited to improving what already works

– research of new solutions is essential - free from market pressures

– public funding needed for basic research to broaden future options

– industry / research centre dialogue essential without dependency

Retrofitting– most buildings outlive the times and shortcomings of their creator

– changes in building sector take time to show effect

– cost effective integration of energy measures during refurbishment

– legislative and financing measures needed

Network Strategy Report - LightingNetwork Strategy Report - Lighting

Few, multi-national firms produce most lamps in large factories Publicly funded research has little impact Legislation can increase demand for high efficiency lighting Lamps for buildings:

– halogen and incandescent - poor efficiencies, short life spans

– tubular fluorescent: T5 + electronic ballast considered most efficient

– high pressure sodium: less efficient but good in some applications

– CFL: efficient alternative to incandescent - special optics needed Developments anticipated in:

– Light Emitting Diodes, metal halide lamps Luminaires: efficiencies of 75% (85% with high reflection optics) Large savings possible with good lighting design


Daylighting costs: in design, spec., const. of windows / spaces

Glazing size, type: energy balance: heating, cooling, lighting

Advanced glazing, shading, design of internal spaces

Major barriers to good daylighting:– lack of awareness by clients, occupants

– low direct financial benefits

– long pay-back periods with some solutions

– few design teams able to achieve optimal daylighting design


Challenges:– high efficiency task lighting 600 lx on desk + luminance control

– user-friendly automated controls with override

– well adapted solar shading to give needed luminance + daylight

– façade systems for glare control and good daylight penetration

– roof systems with integrated solar protection


Design support:– daylighting simulation software adapted to CAD

– daylighting databases - materials, climatic data

– detailed design information from glazing, component manufacturers

Stimulation of demand:– definition of ‘reasonable standards’ for lighting power, consumption

– exemplars of high quality, low energy solutions


Most impressive progress to date:– development of high efficiency lamps by multi-national companies

– client awareness in some markets (Germany, Switzerland, etc.)

Future high efficiency solutions depend on:– ability of lighting, window component industries to demonstrate

energy and amenity benefits

– closer liaison between researchers and manufacturers to identify best technologies / techniques and promote benefits

Network Strategy Report - Mech. Heating + CoolingNetwork Strategy Report - Mech. Heating + Cooling

Components:– recent focus on cost and energy efficiency

– trend towards packaged, pre-tested equipment (esp. ventilation)

– heat recovery now commonplace

– high efficiency condensing gas boilers now standard

– heat pumps: technology advancing, new refrigerants needed

Future lies in integrating components into efficient systems

Systems:– all elements that influence internal climate - façade to mech. plant

– emphasis varies with climatic conditions


Future development:– use of ventilation systems likely to increase with need for greater

IAQ, especially in urban areas.– limited information available on low pressure heat loss recovery

systems and the behaviour of filters at reduced face velocity

Health:– IAQ and particulate filtration likely to gain momentum– research into harmful effects of particulates (size, etc) needed

Sustainability:– ground water heat pumps for cooling– water conservation / reuse


Summary:

Focus on integrated systems

Feedback on installations and lessons learnt

Low pressure systems

Health guidelines

Ground source cooling and water conservation

Network Strategy Report - PV in BuildingsNetwork Strategy Report - PV in Buildings

PV in second decade:– many examples show good functionality and building integration

– potential for prestigious applications and simpler roof applications

– wide range of products available

Current trends:– power supply issues are main focus - less emphasis on BIPV

– 100,000 roofs and guaranteed PV electricity prices successful

– similar actions in NL, CH, Italy, but further coordination needed

– roof mounted PV market is more important that PV facades

Much development needed to achieve commercial products

Network Strategy Report - PV in BuildingsNetwork Strategy Report - PV in Buildings

Conclusions:– much development in high quality BIPV is still needed– strong trend in pre-fabricated BIPV in several Member States– many marketing strategies tried but little coordination– main focus is on safety, performance - little in building integration

Future RTD needs:– guidelines / requirements on functional and aesthetic integration– LCA, eco-performance (energy and material balance)– costs and performance of whole chain from cell to grid connection– improved, innovative PV roofing technology; better marketing– cell and module technology for low cost manufacturing– cost reductions; links with other RTD projects worldwide

Network Strategy Report - Building ComponentsNetwork Strategy Report - Building Components

Windows and facades:– major developments is past decade in thermal, light transmission

performance and time-variable properties (switchable glazing, etc)

– shift in focus from winter comfort to indoor climate and energy

– change from poorly performing elements to advanced components

– integrated design - working in harmony with HVAC, lighting

– major new opportunities in indoor climate and energy performance

Other components:– less spectacular development in energy performance generally

– exceptions: vacuum insulation, elimination of conventional house heating systems - greater emphasis on building skin performance


The market:– wide range of window and façade systems, products

– uptake varies widely across EU but different from 10 years ago

– marginal uptake of variable glazing, hybrid PV - due to cost

Future challenges:– substantial improvements still needed

– vacuum glazing for large applications but edge losses, condensation

– reliable climate façade concepts with optimised performance

– attractive solutions for integration or renewables in facades


Design support:– whole building design support and evaluation increasingly needed

– window, façade performance influenced by occupancy, esp. housing

– support for ‘climate facades’ for better comfort and energy use

– design support for opaque elements is easier except where no conventional heating system is used

Standards, regulations– need for more integrated performance assessment methods

– common (EN) standards are interpreted differently in Member States

– not possible to assess advanced systems using current standards

– optimisation and standardisation of assessment procedures needed

Network Strategy Report - Building, Urban DesignNetwork Strategy Report - Building, Urban Design

Changes in focus: – from energy in buildings to sustainable design

– from single buildings to urban and brown field settings

Sustainable design:– minimise energy wastage (construction materials, water, etc.)

– rational use of energy - passive solar design in new build and retrofit

– implementation or renewable energy strategies


Key issues:– integration

– capacity building

– dissemination

Research needs:– establishment of targets

– development of design tools

– dissemination


Sustainable design:– whole life analysis

– embodied energy in construction materials can be 5 times annual

– PV may have 2 year energy pay back but much longer cost pay back

– materials: renewable or finite, long/short life

– adaptable design, flexibility - ‘loose fit’

– microclimate: overshadowing, winds, air and noise pollution

– Better urban microclimates - better use of natural ventilation

– effects on health, comfort and energy use of air quality, lighting, natural ventilation, solar gains


Key issues:– integration of active (RES) and passive (RUE) energy systems

– integration of local, national and international scales

– local traditions, skills, materials

– integration of technical issues with social and aesthetic concerns

– stimulating design opportunities offered by energy-efficient design

– capacity building: increase awareness and expertise through training

– dissemination: exemplars, technologies, products/systems


Research needs:– establish appropriate targets

• through education, training, dissemination, legislation

– sustainability indicators

– life cycle assessment

– ongoing building performance assessment

– performance of building elements and materials

Design tools– refurbishment

– urban scale assessment

– IAQ and improved comfort assessment

network strategy report - solar technologies ongoing building sector changes: social and economic...

Documents

good lighting design

good energy technologies

research research

emphasis slide

research retrofitting

high efficiency lighting

high efficiency task

good daylighting