Study On Regulation Mode Of Air Source Heat Pump Centralized Heating System In Cold Areas

With the increasing shortage of energy,the application of air source heat pump as an energy-saving device has become widespread,and the energy consumption of air source heat pump centralized heating system in cold areas has also attracted much attention.Unlike conventional heat sources,the performance of air source heat pump units is affected by outdoor air parameters and water supply temperature,and defrosting should also be considered.In addition,the operation energy consumption of air source heat pump central heating system also needs to pay attention to the energy consumption of both units and pumps.Whether the regulation conclusion of conventional central heating system is also applicable to air source heat pump system,under which regulation mode the energy consumption of air source heat pump central heating system is the lowest,and how different factors affect the air source heat pump central heating system,the above issues are the focus of this paper.This paper studies the performance of air source heat pump unit,qualitatively analyses the influence of outdoor temperature and water supply temperature on the heat and COP of the unit,and gives the quantitative relationship between the heat and COP of the air source heat pump unit by using the method of numerical analysis.The influence of different frosting degree on unit heat and COP is analyzed,and the calculation method of unit defrosting energy consumption is obtained.According to the characteristics of air source heat pump unit,the system form of air source heat pump centralized heating system is determined as direct connection,no heat exchanger and water mixing device and floor radiation at the end,and three regulating modes are determined.The system with radiator at the end is analogous to the system with radiator at the end.Referring to the relevant specifications,the lowest operating temperature of the heating system with floor radiation at the end is calculated.The flow rate is 70%.Four representative cities in cold regions were selected to calculate the operation energy consumption of air source heat pump central heating system in heating period under three different plot scales.From the two aspects of unit energy consumption and pump energy consumption,the influencing factors and proportion were analyzed,and the most suitable and energy-saving regulation mode of air source heat pump central heating system was obtained.Finally,the influencing factors of energy consumption of air source heat pump central heating system are analyzed,and different influencing factors are classified.The power function model is used to obtain the quantitative relationship between energy consumption of air source heat pump central heating system and different influencing factors.Based on this quantitative relationship,the energy saving suggestions of air source heat pump central heating system are given.