Study On Optimization Of Combined System Of Solar Ground Source Heat Pump For Heating

In modern society,energy has become the material basis for human survival,and also an important factor restricting the development of urbanization and industrialization of all countries in the world,all countries in the world are facing the pressure of energy conservation and emission reduction.In terms of the proportion of energy consumption in the world,the building energy consumption accounts for 20% to 45% of the total primary energy consumption,and more than 70% of the building energy consumption is used for heating and cooling of air conditioning.Under the background of advocating energy conservation,emission reduction and sustainable development,it is of great significance to study the solar ground source heat pump system.In this paper,TRNSYS system is used to model a solar ground source heat pump system under typical climate conditions in Tianjin,and the accuracy of the model is verified by the comparison of experimental and simulation results.The results show that the maximum error of the collector outlet temperature is 10.1% in the two-day operation time,the error of the data in the rest time is within ± 10%,the error of the collector effective heat collection is 18.4%;the maximum error of the buried pipe inlet temperature in the two-day operation time is 15.4%,the maximum error of the outlet temperature is11.8%,the error of the data in the rest time can be maintained within 15%,and the data in the two-day operation time is hot The heating power error of the pump unit is kept within± 11.6%.In this paper,the solar ground source heat pump combined heating system is studied,physical and mathematical modeling of solar collector and buried tube heat exchanger.The results show that when the collector angle is 55 ° and the collector area is 8m,thesolar hot water system can get the best performance and economy;when the velocity of the buried pipe inlet is 0.6m/s,the system can ensure the best heat exchange performance;when the buried pipe length is 200 m,the system can ensure the best economy;at the same time,the greater the soil thermal conductivity is,the better the heat exchange performance of the buried pipe isAlso,establishes the mathematical model of solar ground source heat pump combined heating mode,and analyzes the operation principle of each mode.Based on TRNSYS simulation platform,this paper models four heating modes of solar ground source heat pump system and simulates the operation characteristics of each mode in typical climate conditions in Tianjin.The results show that the parallel operation mode has the best performance and economy,the COP of the heat pump unit is 5.03,and the seasonal COP of the system is 4.23;the series operation mode A has the bestenvironmental protection benefit,and the average temperature of the soil only drops by0.9 ? after ten years of continuous operation.This paper optimizes the original ground source heat pump system,combining series mode and parallel mode by using TRNSYS.Compared with the parallel heating system,the optimized system reduces the soil heat exchange by 14.1% and increases the heat supply by 65.6%.Compared with the series heating system,the optimized system reduces the power consumption by 8.6% and cop of unit increased by 1.6%,cop of system increased by 9.1%.