Discussion on "Solar Building" in Baoding: 17 New building energy-saving technology.

"The sun, our light source. It transports heat from the sky hundreds of millions of miles away to the place where we live, so that everything can grow here. Everything admires it, because it is the light that will never disappear ... "This is a famous sentence that the poet Ai Qing praised the sun in his long poem" Ode to Light ".

Today, the first integrated solar photovoltaic building in China will be unveiled in Baoding.

It uses solar energy to generate electricity; It uses treated wastewater as a heat source; It can not only save electricity through new technologies, but also reduce pollutant emissions.

165438+1In the middle of October, the solar panels outside Baoding Diangu Jinjiang International Hotel were basically installed. What are the little-known secrets of this building, which is dubbed as "photoelectric building", "solar building" and "energy-saving building"? What enlightenment does its completion bring to people?

165438+1October 12, workers are installing photovoltaic power generation glass curtain wall at Baoding Electric Valley Jinjiang International Hotel.

This building has become a power station, generating 65,438+0,765,438+0,000 kWh per year.

This is a magical building.

"Light can generate electricity, and this building is a small power station." 165438+1October14th, Apollo, the engineer in charge of the project construction, proudly said that the most attractive thing of Diangu Jinjiang International Hotel is the solar panels covered on the external wall, which turned the high-energy-consuming building into a power station that outputs electricity.

Apollo, 33, has participated in many international projects and has rich experience in the field of solar energy application. He said that at present, the integration of solar photovoltaic utilization and building in China is still in its infancy, and this is the first batch of five hotels that use solar energy to generate electricity.

The east, south and west facades of this building are surrounded by glass curtain walls composed of black solar panels, giving people a heavy feeling. Decorative white aluminum alloy frames distributed on the curtain wall according to certain rules fly lightly.

On the roofs of ancillary buildings that people don't notice, such as the 200-square-meter glass lighting area at the top of the lobby, the awning at the gate to shelter guests from the wind and rain, and solar panels that output electricity everywhere.

"We will install it as much as possible." Apollo said that the solar panels of this building alone invested a huge sum of 80 million yuan. The solar panels installed in these building components have different functions.

The southeast two facades are solar glass curtain walls designed integrally with the building; The west facade is a set of independently designed solar devices, and its significance lies in showing people how to install solar panels on completed buildings; Solar panels installed on lighting roofs and awnings show people the flexibility of using solar devices.

It is understood that all solar cell modules have advanced data acquisition systems, which can record and display the real-time power generation, total power generation, solar irradiance, wind speed and other weather parameters of the solar power generation system, and publish the system operation data on the Internet. Relevant personnel can extract the operation data of global photovoltaic power generation system at any time to provide scientific basis for customers to determine which installation method to adopt.

"We also pay attention to the installation of the glass curtain wall." At the construction site, the construction personnel from Baoding Tianwei Yingli Group introduced that when the temperature of the solar cell module of the solar power generation system is higher than 25 degrees Celsius, the power of the battery module decreases, so the technicians specially set a large number of shutters at the bottom and top of the curtain wall to cool the curtain wall through air convection, which is called "breathing solar glass curtain wall".

After the building is completed, the installed capacity of grid-connected solar panels is 300 kilowatts, which can not only meet the public lighting of the building, but also be connected to the grid for power generation.

But this is only the power generation capacity of the building itself.

According to Apollo, the Electric Valley Jinjiang International Hotel is only the first phase of the planned project, and the second and third phases of the project, including the development of the clubhouse and surrounding communities, will be launched in the later stage. The installation area of the second phase solar glass curtain wall is 9 1 18 square meters, and the installation capacity is 500 kilowatts; Phase III installation area13520m2, and installation capacity of 700kW.

After the completion of the whole project, a 1.5 MW photovoltaic grid-connected power generation system will be built, with an annual power generation of 1.7 1.000 kWh, which can replace 684 tons of standard coal, reduce CO2 emissions by 496 tons, sulfur dioxide emissions by 14 tons, NOX emissions by 7 tons, and soot emissions by/kloc.

Waste water becomes a heat source-saving 6.5438+0.88 million kWh per year.

Walking on the construction site, Guan Li, the engineer in charge of communication, air conditioning, water supply and drainage, fire fighting and other projects of the whole building, suddenly stopped and stepped on the ground: "There are articles below." She said with a smile. The competent engineer said that the heating and cooling of the whole building depends entirely on the reclaimed water discharged from the sewage treatment plant, and now at her feet is a fire pool for storing reclaimed water.

Not far to the west of this building is Baoding Lugang Sewage Treatment Plant. The treated wastewater here is first injected into the fire pool with an internal volume of 1000 cubic meters through a water pipe with a diameter of 800 mm

The temperature of reclaimed water is raised from 25℃ in summer to 30℃ by compressor to extract cold energy in water, and the temperature of reclaimed water is lowered from 16℃ to 10℃ in winter to extract heat in water, so that a large number of cold sources and heat sources are squeezed out of water to supply cooling and heating for buildings. The treated reclaimed water is discharged through a 600 mm pipeline, which provides huge cooling and heating support for five hotels without interruption. "The whole underground pipeline project is more than 2,800 meters long," said Guan Li, who said that it has been completed more than 1 1,000 meters.

According to Guan Li, the use of water source heat pump will not burn mineral energy at first, and there will be no harmful substances discharged. Compared with external cooling and heating, it saves refrigeration room and chilled water pump room, and saves the cost of commercial land.

When the indoor machine is hung on the wall or installed in the cabinet, the room can be decorated without ceiling, saving the decoration cost. Due to the adoption of new technology, the comprehensive energy efficiency ratio of the system is high, the power factor of air conditioning units in single-phase power supply is greater than 0.96, the transformer capacity can be reduced by 20%, and the cost of power capacity increase is saved.

It is particularly noteworthy that due to the use of water source heat exchange, the heat exchange efficiency is high, the condensation temperature is greatly reduced, the energy efficiency of the compressor is 70%-95% higher than that of the air-cooled compressor, and the energy consumption is 40%-60% higher than that of the general air-conditioning equipment.

When multiple units form an air conditioning system, because the air conditioning units can be started and stopped independently, the amount of refrigeration depends on the number of hosts, and the energy regulation of the system is closer to stepless speed regulation than that of water chillers. Moreover, the cooling water is normal temperature water, so there is no cold attenuation in the process of water delivery, and the energy conversion is only once. Therefore, the operating cost of air conditioning system in summer is 20% lower than that of traditional central air conditioning, 30% lower than that of air-cooled or VRV central air conditioning and 40% lower than that of lithium bromide central air conditioning. If the frequency conversion air conditioning unit and waterway frequency conversion regulation are adopted, the energy saving effect of the system will be more impressive.

According to the data, because each unit in the air conditioning system using water source heat pump is independent of each other, the failure of a single unit will not affect the operation of other regional units, and the possibility of failure of the whole system is close to zero, so the system has high security. Moreover, the compressor of the unit itself has high and low voltage protection, high and low voltage protection and overcurrent and overheating protection. The compressor works in cold water for a long time, with good working conditions and low working load.

Taking Diangu Jinjiang International Hotel as an example, according to the calculation that the air conditioner is usually used for 3 months in summer, 4 months in heating, 30 days per month and 0/0 hour per day, the operating expenses of water source heat pump and steam heating system in winter are 1.353 million yuan and 2.764 million yuan respectively. In summer, the operating expenses of water source heat pump and water-cooled screw unit are 862,000 yuan and 978,000 yuan respectively, which have obvious cost advantages.

In addition, there are four water supply pipes in the building: cold water, hot water, hot backwater and reclaimed water, among which the newly added reclaimed water pipe is responsible for the flushing of sanitary ware. In addition, the water for fire fighting in buildings and irrigation for landscaping in the whole square is provided by reclaimed water, which completely avoids the use and exploitation of tap water and groundwater in toilet flushing, fire fighting and garden water.

The use of a large number of reclaimed water has also brought great economic benefits to buildings. According to reports, the current price of reclaimed water in Baoding is much lower than that of tap water or groundwater exploitation, which has become another benefit growth point of energy saving in the whole building.

When sewage source heat pump central air conditioning and hot water system is used in hotel projects, it can use 7.37 million m 3 of reclaimed water every year, and the operating cost of the system is 6.5438+885 million yuan less than that of water-cooled screw steam system, and it can save 6.5438+880 thousand kWh of electricity, 752 tons of standard coal, 546 tons of carbon dioxide emissions and 654.38+06.54 tons of SO2 emissions every year.

A New Building Cluster —— 17 Technology to Explore the Road of Energy Saving

While the construction of Diangu Jinjiang International Hotel is stepping up,10.5, 165438, another building exhibition center, Diangu Business Conference Center, has officially started construction.

This business conference center has a building area of 24,000 square meters and a large underground parking lot of 25,000 square meters, with a total investment of 255 million yuan. On the fourth floor of the business conference center, there is a Baoding urban planning exhibition hall covering an area of 2000 square meters. Exhibition Baoding urban planning, urban development pictures, large sand table, etc.

This is only part of the construction plan of "Electric Valley Plaza".

Diangu Square covers an area of 14.4 hectares, with a total construction area of 1 1. 18 hectares. In the planning of Diangu Plaza, it includes Diangu Jinjiang International Hotel, business conference center, clubhouse, serviced apartment, residence and a large underground parking lot. All these buildings will adopt new technologies of energy saving and emission reduction.

At the bidding meeting of the building, the construction scheme put forward by Yingli Group has caused a sound of amazement.

This building was originally a "semi-finished" project in Baoding High-tech Zone. In the past few years, the construction unit has been changed several times, but the original plan has never been completed.

At the beginning of Yingli's decision to participate in the construction bidding, a question has been haunting them: what kind of buildings should be built to meet the requirements of environmental protection?

Yingli Group, which has been engaged in photovoltaic industry for nearly 10 years, naturally turned its attention to "solar energy".

"Energy conservation and emission reduction is one of the themes of this era." Miao Liansheng, chairman of Yingli Group, said that once their plan was launched, it was supported by the Baoding Municipal Party Committee and Government, and the Baoding Municipal Government even sent a letter to Yingli Group to ensure strong support in the construction of the Electric Valley Plaza.

In Miao Liansheng's view, energy conservation and emission reduction has become the trend of future buildings. For this reason, Yingli Group has studied many technical problems related to the future building-the technical difficulties that the welding strip is deformed due to the excessive spacing between the batteries, which affects the appearance; Development of hidden frame special solar all-glass module: technical difficulties in installation and wiring of hidden frame and open frame solar photovoltaic glass; Technical scheme of standard parts on roofs and curved roofs; Research on data acquisition, communication interface and display equipment of photovoltaic power generation system: study the safety, accuracy, anti-interference ability and anti-intrusion performance of online data; Study on the compatibility between the operation risk of solar photovoltaic system and the control grid-connected system, the reservation of grid-connected interface and the exploration of grid-connected electricity metering system ...

According to the information provided by Yingli Group, there are as many as 17 related new technologies and specifications.

"This is a circular economy system." Miao Liansheng said that the optoelectronic integrated building in China is developing under two development modes: normal development and ecological driving development. By 20 10, its remarkable economic and social benefits will gradually emerge. By then, the proportion of solar energy utilization in the total social energy consumption will continue to increase, and the emissions of carbon dioxide and nitrogen and hydrogen compounds will be greatly reduced.