Application of Solar+Dual-Source Coupling Electric Heating System in Low-energy Buildings
With the increasingly serious ecological and environmental problems,the development and utilization of renewable energy and building energy conservation have become an urgent demand of today's society.Taking the low-energy consump-tion buildings in northern China as an example,an intelligent switching electric heating system with dual source coupling of solar energy and mains is designed.The system can intelligently switch photovoltaic power and mains to provide the source power for the heating end according to the solar radiation conditions.The parameters of the system were tested in typical weather conditions,including photovoltaic power generation,indoor temperature,system electricity consumption,etc.In sunny weather,the photovoltaic power generation can basically meet the daytime heating load,while in cloudy weather,the mains power needs to be used to supplement.Testing the relationship between the solar radiation intensity and the photovol-taic power generation,the results show that the radiation intensity is the most important factor in determining the photovoltaic power generation,and the photovoltaic system has the best radiation conditions between 9:00 and 15:00 per day.This heating method can meet the demand of room temperature of 20 ℃,and the temperature curve verifies the importance of electric heating working together with the solar energy system.The dual-source heating system can effectively adapt to different weather and realize efficient heating of buildings.By using solar photovoltaic and power grid power,the system realizes the intelligent tracking of clean energy utilization and heating load,which not only gives full play to the advantages of renewable resources,but also ensures the continuity of heating.
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