Research On Near Zero Energy Heating System Of Photovoltaic-Photo-Thermal Compound Heat Pump

Solar energy resources inexhaustible,is gradually replacing traditional energy sources to become the leading new energy sources in the future.Under the support of the relevant policies,a variety of solar energy utilization modes have been developed both at home and abroad.The most mature are the photovoltaic power generation technology and solar thermal collector technology.In response to national policies,the green building under the solar power is built.In this paper,Heat compound heat pump system key technologies to study the integration of the system and building optimization design.This article introduced the development trend of solar energy utilization technology,and proposed a new type of photovoltaic-photothermal composite heat pump heating system,combined with storage tanks and batteries to store the solar energy collected by solar panels and photovoltaic panels.A two-storey villa in Zhengzhou was chosen as an architectural model for the analysis of compound heat pump systems.The building area was 212m~2,and the heating area was 183m~2.Using the DeST energy simulation software,the hourly heat load of the building was calculated,and based on the solar radiation value and the heating area of the building,to determine the solar thermal system for heat,photovoltaic power generation,composite solar heat pump system for heat,and in accordance with the building load matching to calculate the solar photovoltaic panels,solar panels area and solar heat pump system design.Then,based on the heating principle of photovoltaic-solar-thermal hybrid heat pump,a new near-zero energy-consumption heating system of photovoltaic-photo-thermal compound heat pump is proposed.Based on TRNSYS software,a simulation model of the system is established.Solar collector module,individual photovoltaic module and solar heating system module,and validate the model to ensure the accuracy of the model.The solar thermal system of heat,heat pump synergies associated design and analysis,to explore the establishment of the synergy between them.From the simulation model of heating system of composite solar heat pump,it is concluded that the heat collection efficiency of the solar collector system varies from 0.26 to0.49 with the monthly heat gain of the solar collector system and the monthly heat supply of the heat pump system.The solar energy guaranteed rate curve In line with the trend of changes in solar radiation intensity,the solar guarantee rate value varies between 0.42-0.89.The total heating capacity of the solar heat pump system can meet the energy consumption demand of the system.The monthly mean COP of the system is 4.65,and the overall heating performance of the system is good.The COP of the heat pump system varies from 1.67 to 3.3and reaches the peak of 3.3 in May.According to the established simulation model,we can see that the heating system of photovoltaic-light-heat compound heat pump proposed in this paper can continuously provide heating hot water and domestic hot water at a temperature of no less than 45?for the model building in one year.In addition,due to the certain area of solar photovoltaic panels,The PV system proposed in this study only considers the winter heating and domestic hot water supply,while the summer heat and power generation are very high,resulting in a surplus of power generation in summer.Considering the summer heat supply from June to The required cooling load in September,through monthly power generation capacity and cooling load comparison shows that the system settings to meet the summer cooling.The cumulative total surplus electricity 5.04×10~7 kJ,into the national grid,a year is expected to benefit ?5180.