| Air source heat pump assisted solar heating technology is a newly emerging new energy heating technology.This method not only provides good heating effect,but also solves the problem of energy shortage caused by traditional energy heating.Therefore,the rational use of new energy for heating and reducing the consumption of fossil fuel resources have important development significance for promoting social resource conservation,protecting the environment,and reducing energy consumption.This article takes a small and medium-sized factory in Ordos City,Inner Mongolia as the research object,explores the heating effect of the heat source system on the building,and improves the energy efficiency and economy of the heating system through a series of optimizations.Firstly,it analyzes the heating status of the building,and conducts a one-week actual measurement in the coldest month to analyze the temperature and energy consumption of the system;then establishes a TRANSYS simulation model of the plant,and verifies it through the comparison of the measured data and the simulated data The accuracy of the simulation model;followed by orthogonal experiments without interaction to optimize the heating system collector area,the air-source heat pump unit’s rated heating power and the volume of the hot water storage tank,and obtain the optimal combination plan of the system;finally,Based on the outdoor weather conditions where the system is located and the heating load of the building,the operation control strategy of the system is studied and analyzed.The results show:1. Through the one-week data measurement and analysis of the air source heat pump assisted solar heating system in the coldest month,the temperature and energy consumption data of the system operation are obtained.During the test,the average return water temperature of the air source heat pump was 40.5°C,the average outlet water temperature was 43.7°C,the average temperature difference between the supply and return water was 3.2°C,the average heat collection efficiency of the solar cooling system on the coldest day was 0.23,and the indoor temperature was basically maintained Above 16℃.During the test,the average daily heat supply of the solar system was 51.3k Wh,the average daily heat supply of the air source heat pump was185.43 k Wh,the average daily power consumption was 52.51 k Wh,and the average comprehensive energy efficiency ratio of the system during the test was 1.9.2. Establish a TRNSYS simulation model of the system,select the measured data of January 11 and the simulated model for comparison.The average measured temperature of the solar collector’s daily water output on that day is 30.92℃,and the simulated value is 34.75℃.The error rate with the simulated value is 12.39%,the measured value of the average daily temperature at the top of the hot water storage tank is 26.75℃,the simulated value is 29.8℃,and the error rate between the measured value and the simulated value is 11.40%.The change trend of the measured value and the simulated value is consistent,and the error rate is within 15%,which shows that the model can represent the entire system for the next analysis.3. The orthogonal test without interaction is used to optimize and analyze the system components.When the system COP index is used,the area of the collector is435m~2,the rated heating power of the air source heat pump unit is 127.5k W,and the volume of the hot water storage tank 25.1m~3 is the optimal scheme of the system.The optimal scheme combination is called A5B5C5;when the annual cost is used as the evaluation index,the collector area is 335m~2,the rated heating power of the air source heat pump unit is 61.5k W,and the storage water The tank volume of 21.7m~3 is the optimal scheme of the system.The optimal scheme combination is called A1B1C3;the optimal schemes obtained by two different evaluation indicators are compared again.The COP value of combination A1B1C3 is 10.19%lower than that of combination A5B5C5,and The annual value of its cost has been reduced by 19.84%yuan.Because the percentage of annual cost of the cost has been reduced by a large percentage,this project is considered comprehensively and the combination A1B1C3is selected as the optimization plan.4. Based on the outdoor weather parameters of the project location and the heating load of the building,the operation strategies of the heat collection system and the air source heat pump system are optimized.The control method of the heat collection system adopts the temperature difference control strategy,and the upper limit of the temperature difference is set to 6℃,the lower limit of temperature difference is 2℃.The air source heat pump system adopts the"maximum utilization of solar energy"strategy,by calculating the time point and time period of the separate heat source,and obtaining the heat distribution problem of the dual heat source during heating,and calculating the start and stop time and start and stop of the heat pump Compared with the quantity before optimization,the heating time of the solar system has increased by 11.1%,which saves electricity consumption and has obvious energy-saving effects. |
