Experimental Study On Multi-Source Composite Heating System In Severe Cold Area

At present,China is short of energy and the environmental problems caused by the utilization of fossil energy are becoming more and more serious.Based on the current energy development situation,the state puts forward the plan of "carbon peaking and carbon neutralization" to develop clean energy.In order to solve the problem of new energy heating with single heating structure and low heating flexibility,this experimental study puts forward the idea and solution of multi-source heating.The composition and shortcomings of the original multi-source heating structure are analyzed,and the experimental research system,multi-source composite heating system,is proposed.According to the climate characteristics of severe cold areas,three different operation strategies are designed,such as solar heating time strategy,heat pump heating time strategy and temperature regulation strategy.Through experimental test,the specific performance of the system under different heat source situations and different operation strategies is analyzed,and the advantages,disadvantages and benefit analysis of the experimental mode are evaluated.The experimental results show that the multi-source composite heating system has more flexible heating structure and higher energy efficiency ratio than a single heat pump heating system or solar heating system.The working efficiency of multi-source composite system under the working time strategy conducive to solar heating is 36.8%higher than that of heat pump system under the same heating strategy,and the working efficiency under the working time strategy conducive to heat pump heating is 16%higher than that of heat pump system under the same working strategy.According to comprehensive analysis,the energy efficiency ratio of multi-source composite heating system is higher under the working time strategy conducive to solar heating,and the heating proportion of solar heating system and heat pump heating system under this heating strategy is 58% and 42%,which can be used as a reference for selection of subsequent application equipment.In the whole heating season,the multi-source composite system provides heat under the working time strategy conducive to solar heating.The whole heating season provides heat for the experimental room of5181.73 kw,and the comprehensive average COP value is 2.6.The comprehensive energy efficiency ratio of heat pump system is 2.3 under the condition of night valley power storage.In the whole heating season,the quality of standard coal saved is519.8kg and the carbon dioxide emission reduced is 4.21 t.The average heating cost of multi-source composite system in the whole heating season is 13 yuan per square meter.Compared with central heating and electric heating in Changchun,the heating cost is saved by 59.9% and 62.6% respectively.