Summary
China’s HSWW standard was developed especially for the warmest southern regions of China in 2003. Mandatory requirements are set relevant to the two climate zones (North and south), with provisions outlined for thermal envelope components and energy efficiency requirements for heating, cooling, hot water and plumbing systems. The standard allows a prescriptive path or simulated ‘custom budget’ approach (reference building) to show compliance.
The HSWW standard was the first of its type in China, with the aim being to reduce annual energy consumption of HVAC systems by 50%. Thus the standard includes dynamic aspects to improve energy efficiency such as natural ventilation, shading and passive cooling considerations including specific window to wall ratios according to the orientation of a building, economic analysis of heating and cooling systems and renewable energy and new technology encouragement.
General Information
Full Title of Code
Design Standard for Energy Efficiency in Residential Buildings in the Hot Summer and Warm Winter Zones
Year of Adoption
2003
Date of Enforcement
Wednesday, October 1, 2003
Authority in Charge
Ministry of Construction of the People's Republic of China, Authorized by the Institute of Standards and Norms of the Ministry of Construction
Link
Link to Relevant Web Page
http://www.sustainablebuildingscentre.org/buildings/codes/China
Remit of Code
Geographical Coverage
China
Code set at:
National Level
Coverage
Coverage of Building Code:
- Residential buildings
- One family
- Multiple family buildings
GBPN Climate Classification:
- Cooling Based
- Warm and Humid
- The hot summer and warm winter zone is divided into the South and North Areas in the Standard. The energy efficiency design of building in North Area shall mainly focus on the summer cooling in consideration of the winter heating meanwhile; and that in the South Area shall consider the summer cooling other than the winter heating.
Type of Building Code
Type of Building Code:
- Model code, frame or actual code:
Regional Climate Code. - Prescriptive Codes:
The standard allows a prescriptive path or simulated ‘custom budget’ approach (reference building) to show compliance. - Energy Declaration:
Partially, not for all new buildings. It is dependent on local governmental policies. - Model / reference Building:
The energy efficiency design of residential buildings may adopt the "custom budget method” for comprehensive evaluation in comparison with a reference building.
Energy Covered
Basis for Energy Requirements:
- Overall performance frame:
Not an overall performance frame, however, by adopting rational energy conservation building design and taking energy conservation measures for reinforcing the thermal-barrier and insulation performances of the building enclosure and improving the energy efficiency ratio of cooling and heating equipment, based on the premise of an identical indoor thermal environment, the total annual cooling and heating energy consumption shall be decreased by 50% in comparison with no energy conservation measures. - Final Energy:
Partially, the custom budget method is used during the design stage. The energy used in the simulation is based on site energy.
Energy Uses and Functions Covered by the Code:
- Heating
- Cooling
- Ventilation
- Thermal bridging
- Lighting
- Design, position & orientation of building
- Heat recovery
- Passive solar
- Passive cooling
- Natural ventilation
- Solar protection
- Daylighting requirements
- Renewable Energy (solar, PV, others):
If conditions permit, the residential area should adopt the winter central heating by thermal power plant, summer absorption concentrated-cooling technology, or small-sized (mini-type) gas turbine-absorption concentrated-cooling/heating technology, or ice-storage concentrated-cooling technology. If conditions permit, cooling and heating technologies through renewable energy sources such as solar energy, geothermal energy and ocean energy should be adopted in the residential building.
Enforcement
Enforcement Status of Code:
Mandatory
Type of Enforcement:
- Local enforcement
- Third party inspection
On-site Inspections Occur
- During construction
- Post completion
Penalties for Non-compliance:
- Fine
- Refusal of permission to occupy
- Refusal of permission to construct
Measures Supporting Enforcement:
- Training of Inspectors
Values for New Buildings
Residential Buildings - North Area
GBPN Climate Classification
Cooling based
Coefficient for Comparison of Climate Zones
0.00
Mean | Min | Max | |
---|---|---|---|
HDD (°C) | 450 | - | - |
CDD (°C) | 2285 | - | - |
U-Value (W/m²K) | |||
---|---|---|---|
Roof | 0.5 | Roof2 | 1 |
Wall | 0.7 | Wall2 | 2 |
Floor | - | Floor2 | - |
Window | 2 | Window2 | 2.5 |
Others | - | - | - |
Overall U-Value | - | - | - |
Window1 | Window2 | |
---|---|---|
G Value/SHGC | - | - |
Visible Transmission | - | - |
Percent | - | - |
Other Requirements Set for:
- Ventilation:
When designing the residential building ventilation, the ventilating mechanical equipment should select the energy-saving equipment and products in compliance with those specified in the current national standards. The residential building ventilation design shall handle the indoor air distribution appropriately so as to improve the ventilation efficiency. - Heat Recovery
- Technical HVAC systems
- Efficient Lighting
Residential Buildings - South Area
GBPN Climate Classification
Cooling based
Coefficient for Comparison of Climate Zones
0.00
Mean | Min | Max | |
---|---|---|---|
HDD (°C) | 450 | - | - |
CDD (°C) | 2285 | - | - |
U-Value (W/m²K) | |||
---|---|---|---|
Roof | 0.5 | Roof2 | 1 |
Wall | 0.7 | Wall2 | 2 |
Floor | - | Floor2 | - |
Window | - | Window2 | - |
Others | - | - | - |
Overall U-Value | - | - | - |
Window1 | Window2 | |
---|---|---|
G Value/SHGC | - | - |
Visible Transmission | - | - |
Percent | - | - |
Other Requirements Set for:
- Ventilation:
When designing the residential building ventilation, the ventilating mechanical equipment should select the energy-saving equipment and products in compliance with those specified in the current national standards. The residential building ventilation design shall handle the indoor air distribution appropriately so as to improve the ventilation efficiency. - Heat Recovery
- Technical HVAC systems
- Efficient Lighting
Code History and Future Targets
Zero Energy Targets:
- Definition of nZEB/ZEB/Plus Energy etc:
China is currently at the studying stage of these definitions and concepts. - All end uses are not included
- There is not a realistic roadmap in place:
China is now focused on the compliance of building energy efficiency for new buildings, rather than ZEB. - National Target date for nZEB:
China is currently at the studying stage of these definitions and concepts.
Multiple set of data:
- Levels beyond minimum:
0 - Year historic or aspirational codes (planned) :
2003 - Actual level of energy consumption in target
- Relative target in percent:
0 - Absolute target:
0 - Comments:
N/A
- Relative target in percent:
Supporting Measures
Involvement of Stakeholders in the Development of Codes
During the development of building energy codes, invited building energy experts are heavily involved in the development of building energy codes/standards. They have direct experiences of using building energy codes, and/or communicate directly with other key stakeholders who practice building energy codes. Some of these experts also have contact with relevant national policy decision makers, which help build communication between policy development and code development.
Level of Training Provided to Stakeholders Following Implementation of Code?
Training is provided in some jurisdictions.