Application Analysis Of Air Source Heat Pump Heating For Rural Residential Buildings In Tianjin

In order to solve the increasingly prominent energy environment problems,China has taken the lead in the Beijing-Tianjin-Hebei region to implement the "coal-toelectricity" policy,which mainly air source heat pump heating,but there are still many problems in the selection of heating end,control strategy and so on.Therefore,in order to study the change of heat comfort demand of residents after heating in rural area of Tianjin to replace coal-fired heating,the heating effect of different heating ends,and the current control strategy of rural households when using air source heat pump heating.This article has carried out the following work and content.First of all,the thermal engineering parameters of a rural residential construction in Wuqing District,Tianjin were investigated,and 72 representative households were selected to conduct thermal comfort research by questionnaire survey method,and a thermal comfort evaluation model for rural residents in the current air source heat pump heating environment was established.The difference of thermal comfort of users under coal-fired heating and air source heat pump heating is compared.Secondly,the selection of the radiator end of the typical household and fan coil as the end of the typical household 1 household each,carried out on-site testing,analysis of indoor heat environment and air source heat pump heating system energy consumption,The applicability of air source heat pump heating system in rural areas of Tianjin was evaluated.Then,with Energy Plus as the simulation platform,the test results of the fan coil user and radiator user are simulated to verify the accuracy of the model,and then the simulation is carried out in the same building environment.Based on the same indoor thermal comfort conditions,the two different heating ends are used to analyze the operating characteristics and energy consumption of the air source heat pump heating system during the initial cold,cold,last and coldest days.Finally,the operation adjustment strategy of the heating system of the rural air source heat pump based on the temperature control of the variable water return is put forward.Through the research,the following conclusions are drawn: The research shows that 90% of the residents in rural areas of Tianjin can accept the operating temperature range of 16.4 degrees C to 19.2 degrees C,the traditional coal-fired stage thermal comfort model has not been applicable to the thermal comfort requirements of residents after the change of heat source mode.In addition,during the measurement of the heating system found that the air temperature level of the fan coil user indoor is higher than that of the radiator user,and compared with the traditional heating system,the air source heat pump heating for the return water temperature difference is small,more conducive to energy saving.Through the Energy Plus simulation,it is found that the unit required for the end of the wind plate is cooler and the system consumes less power,given the condition of indoor comfort.In terms of control optimization strategy,this paper simulates and calculates the corresponding return water temperature under different outdoor air temperature intervals,which provides a theoretical reference for the further promotion of the temperature control of the unit’s variable return water.