Simulation Study On Performance Of Solar Air Source Heat Pump Dual Water Tank Composite Heating System In Rural Areas Of Beijing

Judging from the proportion of energy consumption in China,as a kind of energy consumption for people’s livelihood,building energy consumption is one of the main components of energy consumption in China,and building energy consumption accounts for more than 30% of total energy consumption.In order to transform China’s irrational energy structure and reduce building energy consumption,in recent years the northern region has begun to implement the "coal to electricity" project.During the implementation of the "coal-to-electricity" project,because air-source heat pump heating is not restricted by the region,there is no complicated water system and the efficiency is relatively high.At present,after the "coal-to-electricity" heating in rural areas in Beijing,air source heat pump heating the Lord.However,there are still some problems in practical applications.Air source heat pumps have poor performance and low power consumption in cold regions with low winter temperatures.As a result,residents using a single air source heat pump are too expensive to heat,and residents cannot afford it.Once the power fails,the comfort of indoor thermal heating cannot be guaranteed.In addition,most areas in the north cannot provide huge financial subsidies,and residents are under great economic pressure,so the current“coal-to-electricity” project is not comprehensively promoted.Aiming at the situation that the heating energy consumption of a single air source heat pump system is too high,and the heating performance of the heat pump unit deteriorates severely with the ambient temperature,this paper proposes a solar water source heat pump dual water tank composite heating system suitable for rural areas in Beijing.This paper proposes a time-phase control strategy for exploring the more reasonable heating time matching methods of the two heat sources of the solar system and the air-source heat pump system.A TRNSYS simulation model of the solar air source heat pump dual water tank combined heating system was established.Through the performance simulation analysis of three solar air source heat pump composite heating modes,the solar energy air source heat pump dual water tank combined heating method was obtained.The best form of heating for winter heating in rural areas of Beijing.In addition,the effects of three factors,namely the temperature of the hot water supply system,the volume of the hot water storage tank,and the solar load rate,on the system performance were analyzed.The results show that the solar air source heat pump dual water tank composite heating system has better heating performance.Under the experimental conditions,the highest energy efficiency ratio of the system can reach 7.22,at this time the solar energy contribution rate ofthe system is 63.69%,and the heating performance coefficient of the heat pump unit is 2.91.When the dual-tank heating system’s solar load rate is 40%,the system has the best energy saving and environmental protection.At this time,the energy saving rate is 69.2% and the CO2 emission reduction rate can reach 69.22%.The dual-tank heating system’s solar load rate is 20%.At the time,the investment recovery period for the dual-tank composite heating system was the shortest,at 5.86 years.Therefore,in actual engineering applications,we should adapt to local conditions and choose the corresponding design scheme according to economic or energy-saving requirements.