The reporter learned from the Construction Department of Guangxi Zhuang Autonomous Region on the 27th that this year, 96 buildings and energy-saving demonstration projects were screened out in Guangxi, and 22 million yuan of financial support was given. After the completion of these projects, the annual energy saving will be 51.08 million kWh.
Since 2007, Guangxi has promoted ground source heat pumps, solar building integration, air conditioning, self-insulating concrete blocks, shale sintered porous bricks, hollow beamless slabs, new building waterproofing, and new tertiary steel in the construction field. 10 building energy-saving technologies such as high-performance concrete and lighting power saving. After more than a year of hard work, these advanced and applicable technologies have been widely used in Guangxi.
Wei Liping, deputy director of the Construction Department of Guangxi Zhuang Autonomous Region, said that in recent years, Guangxi has organized the declaration of construction of science and technology and building energy-saving demonstration projects every year, and vigorously promoted the demonstration results, while fully absorbing the demonstration results when formulating policies and standards.
The reporter learned that the building energy-saving demonstration project selected by Guangxi this year is divided into six major public building energy consumption supervision system construction, green lighting, renewable energy promotion and application, conservation-oriented campus, low-energy building and building energy-saving industrialization base. class.
Wei Liping said that in the next stage, the autonomous region-level and municipal-level finances will allocate more funds each year for building energy conservation, and implement economic incentives and punishment measures for energy-efficient buildings and high-energy-consumption public buildings.
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The following analyzes the causes of ONU energy waste:
1. The interface is idle.
ONU generally includes multiple interfaces. Such as FE interface, GE interface, POTS interface, WIFI and IPlV interface, etc. In many cases, only part of the interface is used, and energy is consumed when the interface is idle.
2. Increased energy consumption caused by chip module design.
In the ONU design, the modules are usually divided by function and integrated on the same chip, controlled by an enable terminal. When power is supplied, the entire module needs to be powered, and the unnecessary functional blocks are also consuming energy.
3. Processing of OLT data.
Due to the broadcast transmission characteristics of the OLT, when the OLT sends broadcast information or sends information to a certain ONU, other ONUs that do not receive the information must also process it, resulting in a waste of resources.
4. Idle monitoring.
For TDM-PON, each ONU can only send upstream data in burst mode in a time slot authorized by the OLT, and the OLT forwards downstream data in the form of broadcast frames, which makes all ONUs always in operation. The ONU does not know when the user or the OLT will send data to itself. The receiving and sending modules always keep monitoring. When a certain ONU has no upstream or downstream data for a long time, the normal operating state will make it consume more energy.
5. Waiting time.
The structure of the PON system determines that the channel capacity should be shared between ONUs in the upstream direction. The PON system needs to adopt a certain arbitration mechanism to avoid conflicts. Each ONU is allocated a time slot, and frames received from users are buffered first. It can only be sent when it arrives.
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