Technical And Economic Analysis Of Heat Pump Coupled With Energy Storage System In Near-zero Energy Building

Near-zero-energy buildings are the focus of current research on building energy consumption.The technical standards for near-zero-energy buildings GB/T51350-2019 will be formally implemented in September 2019,guiding the design,construction and operation of near-zero-energy buildings.In general,heat and cold sources in near-zero energy buildings are usually provided by heat pumps and energy storage devices.Although there have been some studies on heat pump coupling energy storage at present,there are not many simulation studies on actual different energy storage rates,and most of them only consider high-temperature water energy storage at the load side.This thesis mainly studies the economic and energy-saving properties of different zero-energy residential buildings in different climate zones through different energy storage methods,including Beijing(cold region),Harbin(severe cold region),and Shanghai(hot summer and cold winter region).“Source side low temperature energy storage” and “Load side high temperature energy storage” are used in several typical cities in these regions.Nearly zero energy consumption according to the technical standards for the three climate area residential building load using De ST analysis simulation,through building the hourly load and various indicators,for different working conditions,different climate zones has been carried out of soil source heat pump energy supply system and the different energy storage side energy storage for the condition of different ratio of peak load to carry on the design calculation and equipment selection calculation.TRNSYS was used to establish the energy consumption analysis model for all the above 27 working conditions,analyze the energy consumption of system operation,calculate the initial investment,operation cost and annual cost,and obtain the optimal scheme of soil source heat pump coupled water storage energy of buildings in each climate region under different energy consumption burden rates in non-valley periods.The comparison shows that the non-low valley power load commitment rate has different effects on the building operation energy consumption,and the energy storage may cause the energy consumption to increase or decrease.Compared with basic working conditions in Harbin,the highest energy saving rate is 25% of the source side energy storage,and the energy saving rate reaches 3.64%,and the energy saving is small.For Shanghai,because of the consideration about energy storage only consisting of heat storage during the heating season,the maximum energy saving rate is only 0.8%.For Beijing,the most energy-saving conditions are 75% of the energy storage on the source side,and the energy saving rate is 1.33%.From the perspective of energy consumption,the severe cold regions are more suitable for energy storage than cold regions and hot summer and cold winter regions.For different climatic zones,the impact of different non-low-grid electricity loadbearing rates on energy storage in construction operations is also different.Beijing's loadside energy storage scheme is better than the source-side energy storage scheme,among which the optimal load-side heat storage load is 50%;the Shanghai source side energy storage is 25%,and the result is optimal;It is more economical and bears a load rate of 25%.The source side energy storage cost is the least.