With the gradual deepening of energy conservation awareness, the focus of energy conservation in China's buildings in terms of awareness and behavior has gradually shifted to two important directions, namely, the shift from the earlier emphasis on heating energy conservation to the equal importance of heating and air conditioning energy conservation, and the shift from prioritizing energy conservation for exterior Windows over that for exterior walls.
Research on current buildings has found that the energy consumption of doors and Windows in the envelope structure has become the main source of energy consumption for modern buildings. The improvement of the heat insulation and heat preservation performance of glass, which accounts for 70-80% of doors and Windows, has a significant impact on energy conservation in new buildings. In summer, due to the increase and commissioning of new buildings in various parts of our country, the living environment and conditions of residents have indeed improved. However, as the newly added power supply capacity fails to match the new energy consumption demands of regional buildings, there are still power rationing and blackouts in some areas. It has an impact on people's lives.
So, what are the main heat sources that affect the energy consumption of air conditioners? From GB50736-2012 "Code for Design of Heating, Ventilation and Air Conditioning in Civil Buildings", we can find that the main sources of heat gain in the summer of air-conditioned areas are from eight aspects:
Heat transferred through the maintenance structure.
2. Solar radiation heat entering through exterior Windows.
3. Body heat dissipation.
4. Heat dissipation from lighting.
5. Heat dissipation from equipment, appliances, pipelines and other internal heat sources.
6. Heat dissipation of food or materials.
7. Heat brought in by permeating air.
8. Potential heat generated along with various dissipation processes.
As can be seen from the above, when other heat source conditions remain unchanged, heat transfer through the maintenance structure and exterior Windows is the main source. Reducing the heat entering the glass, which accounts for a large proportion of external maintenance, is the main measure to reduce the energy consumption of air conditioners.
Among the heat sources transmitted through the glass, there is a part of temperature difference heat transfer, that is, the conduction and convective heat transfer caused by the temperature difference between the inside and outside, which can be expressed by the formula Q1=K(T outside -T inside), where the K value is the heat transfer coefficient. When the outdoor temperature is 32℃ and the indoor temperature is 25℃ in summer, and the K window is 2.0W/m ² ·K, this part transmits approximately 14 watts per square meter.
In solar radiation heat transfer, the heat is mainly infrared radiation energy with wavelengths ranging from 790nm to 2500nm, which varies greatly among different types of glass.
Based on the current maximum usage of 6+12+6 Low-E insulating glass, single-silver Low-E insulating glass is approximately 313 watts, double-silver Low-E insulating glass is about 102 watts, and triple-silver LOW-E glass, calculated based on the CET13-65 product of China South Glass Group, is 48 watts.
Calculations show that if different LOW-E energy-saving glasses are selected, the cooling load of the air conditioner in summer will vary significantly due to the peripheral protection and exterior Windows, thereby playing a role in reducing the energy consumption of the air conditioner.
Single silver Low-E hollow, 327 watts; Double silver Low-E hollow, 116 watts; Three-silver Low-E hollow, 62 watts.
Compared with single-silver Low-E insulating glass, three-silver Low-E insulating glass saves 81% of air conditioning energy consumption in summer, and compared with double-silver Low-E insulating glass, it saves 47% of air conditioning energy consumption. The energy-saving effect is very obvious.
China has a large population and a huge total living area. If each household replaces its glass with single-silver Low-E insulating glass with triple-silver Low-E insulating glass, the economic benefits will be considerable.
Sanyin LOW-E glass has excellent energy-saving performance for air conditioners in summer. Additionally, according to experts, due to the extremely Low infrared radiation heat energy, the comfort level of people indoors has also been significantly enhanced. It is a truly ultimate energy-saving, green, environmentally friendly and energy-saving new product.
