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