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Table 4 Energy efficiency retrofit schemes for multi-story office buildings (self-reported)

From: Research on technology clusters and the energy efficiency of energy-saving retrofits of existing office buildings in different climatic regions

Problem classification Energy efficiency technologies and measures adopted
Scheme 1 Scheme 2 Scheme 3
Energy efficiency technologies adopted by the integrated scheme Energy efficiency technologies adopted by the high-cost-performance scheme Energy efficiency technologies adopted by the economical scheme
Lighting Adding a prism light-guiding system Adding a prism light-guiding system Adding a prism light-guiding system
Adding PV panels on the roof to provide lighting electricity Adding PV panels on the roof to provide lighting electricity Increasing energy efficiency lamps
Reflector Reflector Reflector
Adding a prism light-guiding system Adding a prism light-guiding system Adding a prism light-guiding system
Ventilation Increasing draft staircases + heat recovery caps Increasing draft staircases + ordinary vent caps Increasing draft staircases + ordinary vent caps
Adding vents in an internal corridor Adding vents in an internal corridor Enlarging the opening area of the window
Thermal comfort Green roof Adding inverted roof Adding inverted roof
Increasing airtightness of door and window Increasing airtightness of door and window Increasing airtightness of door and window
Adding anteroom Adding anteroom Adding anteroom
Double-layer vacuum low-E glass + bridge-cutoff aluminum alloy frame Double-layer vacuum low-E glass Double-layer hollow low-E-coated glass
PV panel sunshade Push-pull plate sunshade External grating sunshade
System Optimizing cooling system and realizing modularization retrofit Optimizing cooling system and realizing modularization retrofit Adopting efficient pipe network equipment
Replacing or repairing fan coil Replacing or repairing fan coil Increasing energy efficiency lamps
Percentage of reducing the load ≥ 67.11% ≥ 51.3% ≥ 36.25%
Estimated construction cost RMB 5 million RMB 2 million RMB 0.5 million