HVAC energy-saving design for office buildings?

What are the specific contents of HVAC energy-saving design for office buildings? The following Zhong Da consults the bidding teacher to answer your questions for your reference.

In China's office buildings, HVAC energy consumption accounts for 40% of the total energy consumption, which is the most energy consumption in office buildings. Therefore, how to better use HVAC energy-saving design in office buildings will be the key to energy-saving in office buildings. In this regard, this paper will discuss the necessity of adopting HVAC energy-saving design in office buildings, the specific measures of HVAC energy-saving design and the substantive significance of adopting HVAC energy-saving design.

1 Necessity of adopting HVAC energy-saving technology

With the acceleration of industrialization and urbanization in China, office buildings have mushroomed in cities. With the appearance of this phenomenon, urban energy consumption is also increasing year by year. According to statistics, in urban energy consumption, building energy consumption has accounted for 27% of the total social energy consumption, and some cities are close to 40%. In the energy consumption of office buildings, HVAC system accounts for the highest proportion, so how to improve the efficiency of HVAC system and reduce the energy consumption of HVAC system plays a vital role in building a resource-saving society and taking a new road to industrialization in China.

In addition, compared with some developed countries in North America and Europe, there is a big gap in building energy efficiency in China. 1973 after the oil crisis, developed countries have incorporated building energy conservation into national policies. For example, France took the lead in formulating building energy efficiency standards in the following year, requiring that the energy consumption of heating and ventilation in new buildings be reduced by 25% compared with before. Since then, other countries have followed suit, so this standard has gradually become a model of building energy efficiency standards in various countries. After years of efforts, the building energy consumption in France has dropped to 28% of the total energy consumption. Denmark has also made remarkable achievements in this regard. 1992 Danish energy consumption is 222PJ, which is 3 1. 1% lower than 1972. Among them, the national heating energy consumption decreased from 39% to 27%, and the heating energy consumption per square meter of construction area decreased by 50%. These developed countries have a correct understanding of building energy efficiency, and they have seen the importance of building energy efficiency, so they have paid enough attention to it, taken some necessary measures and achieved some considerable results.

Under the background of decreasing global economy and resources, our government has gradually realized the importance of energy-saving technology and taken some important measures. However, China's building energy saving, especially HVAC energy saving technology, still has a lot of room for improvement. Most buildings in China have the problem of poor thermal performance of maintenance structures. In terms of heat transfer coefficient, compared with the developed countries whose climate is close to China, China's external walls are 3.5~4.5 times, external windows are 2~3 times, roofs are 3~6 times, and air leakage of doors and windows is 3~6 times. In addition, there are still some serious problems in building HVAC energy conservation in China: the existing management system in China does not meet the development requirements of building energy conservation, and the reform of management system needs to be further deepened; In the aspect of building energy conservation, the progress of scientific and technological research is slow, and many key technologies of energy conservation need to make major breakthroughs; New technologies and new products of building energy conservation cannot be popularized and applied in time, and some departments need to vigorously popularize and apply them; In addition, the policies, regulations and implementation supervision of building energy conservation in China are relatively backward, which can not meet the needs of the development of energy conservation work. Therefore, China has a long way to go in building energy conservation.

2 HVAC energy-saving technology specific measures

Energy-saving technologies of HVAC mainly include non-electric driving refrigeration technology, energy storage technology and heat pump technology.

2. 1 non-electrically driven refrigeration technology

The weather is hot in summer, and the electricity consumption of residents is greatly increased than usual. In this case, it is undoubtedly unwise to adopt electrically driven refrigeration technology. So people gradually turned their attention to non-electric driven refrigeration technology, and people began to study it gradually. In this technology, it mainly includes gas air conditioning and evaporative cooling.

Gas-fired air-conditioning is an air-conditioning equipment with gas as energy source. There are many ways of generalized gas air conditioning: gas direct-fired machine, gas boiler+steam absorption refrigerator, gas boiler+steam turbine driven centrifuge and so on. What we usually call gas air conditioning is gas direct-fired machine. At present, there are three ways to use natural gas in air conditioning system: one is an absorption cold and hot water unit using the heat generated by natural gas combustion; The second type is a compression refrigerator driven by a natural gas engine; The third type is dehumidification refrigeration air conditioning using the waste heat of natural gas combustion. The widespread use of gas-fired air conditioners is not only conducive to improving the power shortage, but also plays a considerable role in improving the power load rate and peak-valley balance rate, which can not only solve the comprehensive utilization of energy and reduce the waste of resources, but also have remarkable economic and social benefits in improving the operation utilization rate of power equipment, effectively controlling the blind growth of power equipment investment, reducing power costs and stabilizing power supply capacity; In addition, the widespread use of gas air conditioners is self-evident for effectively balancing the peak and valley of gas season, improving the utilization rate of gas pipeline network and reducing the comprehensive cost of gas supply.

Evaporative cooling air conditioning is a technology that uses water to evaporate and absorb heat for refrigeration. Evaporative cooling air conditioning is an environmental protection, university and economic cooling method, which is called "zero cost refrigeration technology", "green air conditioning" and bionic air conditioning. It is a truly energy-saving, environmentally-friendly and sustainable refrigeration and air-conditioning technology, which has been widely used and popularized in Lanzhou, Hohhot, Yinchuan and other northwest regions.

2.2 Energy storage technology

Energy storage refers to starting refrigeration and heating equipment when the power demand is low, storing the generated cold or heat in the medium, and releasing the stored cold or heat for use when the power demand is high, thus reducing the peak power consumption.

Energy storage technology is mainly aimed at the storage of thermal energy or electric energy, focusing on large-scale and long-term applications. In energy storage technology, it is generally required to have high energy storage density, low conversion loss, low operating cost, convenient maintenance and little environmental pollution. At the end of the 20th century, this technology began to be widely used. Brazil is a very successful country in applying this technology. It uses pumped storage power station to reduce the cost of electricity from 3.5 per minute to 2.5 per minute.

Using energy storage technology can reduce the Gu Feng difference of urban office building power grid, improve the efficiency of power grid operation, effectively save energy resources and protect the ecological environment of urban office buildings.

2.3 heat pump technology

Heat pump is a device that Liu Xiang said uses high-level energy to produce heat from low-level heat source to high-level heat source. In China, the low heat source in heat pump technology mainly refers to water source heat pump, ground source heat pump and air source heat pump. Among them, water source heat pumps include seawater, sewage, groundwater and surface water heat pumps. Ground source heat pumps include soil and groundwater heat pumps.

Heat pumps are widely used in China. According to statistics, from 65438 to 0996, the total refrigeration capacity of air-conditioning equipment in China was about 2 million kilowatts, of which the refrigeration capacity of heat pump units accounted for about 60%. Especially in large and medium-sized cities with concentrated population, the energy consumption is large and the pollution problem is outstanding, which creates conditions for the application of heat pumps.

Water source heat pump is an air conditioning technology that uses solar energy stored in the earth's water as a cold and heat source for conversion. Water-source heat pumps are widely used in office buildings in Shenzhen and Guangzhou in southern China, Nanjing and Shanghai in transitional areas, and Beijing and Dalian in northern China. Water source heat pump has many advantages. Water source heat pump is efficient and energy-saving; But also can effectively utilize renewable energy, save water and land; The environmental protection benefit is obvious; One machine has multiple functions and a wide application range; Stable and reliable operation, convenient maintenance, in line with national policies and national policy support.

Ground source heat pump is an efficient and energy-saving air conditioning equipment, which uses shallow geothermal resources to provide heat and refrigeration. It uses solar energy resources stored in soil as cold and heat sources for energy conversion and uses clean renewable energy. Its successful use makes it possible to use almost unlimited solar energy or terrestrial energy stored in it. In addition, the ground source heat pump can not only provide heat, but also air conditioning and refrigeration, and can also provide domestic hot water. Moreover, the use of ground source heat pump has the advantages of automatic operation, no environmental pollution, low maintenance cost, long service life, maintaining ecological environment balance and saving space, so it is widely used in urban office buildings.

Air source heat pump refers to the heat pump equipment that "pumps" the low-temperature heat energy in the air to a high-temperature level to meet the heat demand. It uses refrigerant to circulate in the system under the action of compressor. The refrigerant completes the process of air pressure heating and boosting in the compressor, and releases high-temperature heat to heat water after entering the heat exchanger. The continuous circulation of refrigerant realizes the process of converting low-temperature heat in the air into high-temperature heat and heating cold water. With the characteristics of safe use, saving money, kitchen refrigeration, environmental protection, low carbon and fashion, it is also favored by office buildings.

3 Significance of promoting HVAC energy-saving design

Popularizing HVAC energy-saving design in office buildings plays an indispensable role in alleviating urban energy shortage. In addition, the promotion of HVAC energy-saving design in office buildings is also conducive to improving the urban office environment and keeping the office building environment clean and beautiful. In addition, popularizing HVAC energy-saving design is of great significance for us to accelerate the industrialization process, implement the sustainable development strategy and build a harmonious society with beautiful ecological environment.

4 conclusion

This paper discusses the background of adopting HVAC energy-saving technology in China, analyzes the necessity and importance of implementing HVAC energy-saving technology, puts forward some commonly used HVAC energy-saving technical measures, and points out the general principles, characteristics and advantages of these energy-saving technologies, thus further embodying the significance of popularizing HVAC energy-saving technology in China.

For more information about project/service/procurement bidding, and to improve the winning rate, please click on the bottom of official website Customer Service for free consultation:/#/? source=bdzd