1) The document discusses strategies for achieving net zero carbon buildings by 2030 and 2050 in the UK, where nearly half of annual carbon emissions come from buildings. 2) It outlines the concept of assessing the whole lifecycle carbon of buildings, including both operational energy from heating, cooling, lighting etc. and embodied carbon from construction materials and processes. 3) Methods for reducing operational energy include improving building fabric insulation and air tightness, using efficient lighting and mechanical systems, maximizing renewable energy, and passive design strategies like daylighting and natural ventilation. Reducing embodied carbon involves choosing sustainable materials and optimizing construction waste.

1. // Energy Efficient Building Design
Mehul Chhowala
Energy Modeller / Thermal Engineer
IES VE Training

2. Content
Roadmap to 2030 & 2050
Net Zero Concept
Whole life of Carbon concept
Operational Energy & Embodied Carbon
Step to reduce operational energy
About IES VE

4. Lets take a Example of United Kingdom
• In the UK, 49% of annual carbon
emissions are attributable to
buildings.
• In order to meet our climate change
targets all new buildings must
operate at net zero carbon by 2030
and all buildings must operate at
net zero carbon by 2050.

7. // CARBON PHASES
Extraction & Construction Site Transport In-Use operation & Transport to work Demolition & recycling CO2 Capture
CO2 Release
IN OPERATION
EMBODIED END OF LIFE OFFSET

9. //HEATING &
COOLING
// HOT WATER // VENTILATION // LIGHTING // PROCESS
// REGULATED
// PLUG-IN
// UNREGULATED

12. Operational energy
Fabric U-values (W/m2.K) Walls, Floor, Roof, Windows, Doors
Fabric efficiency measures Air tightness, Thermal Bridging, G-value of glass
Power efficiency measures Lighting power density, ICT loads, etc.
System efficiency measures MVHR, HP SCoP, Chiller SEER, Central AHU SFP, AC set
points
Other Parameters
Balance daylight & overheating
Include external shading
Include openable windows and cross ventilation
Maximise renewables
Form factor

15. Embodied carbon
Products/materials (A1-A3)
Transport (A4)
Construction (A5)
Maintenance & replacements (B1-B5)
End of life disposal (C1-C4)

16. How to Reduce

17. Opportunities to reduce energy consumption in a new residential development

18. Opportunities to reduce energy consumption in a new commercial office development

19. How to Reduce

21. Operational & Embodied carbon and Trajectories

26. // END
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