| As a kind of green and low-carbon renewable energy,geothermal energy has the characteristics of large reserves,wide distribution,clean and stable.In view of the heavy construction load in winter in severe cold areas,the use of traditional energy heating will cause environmental pollution problems,and the use of ground source heat pump technology to achieve seasonal energy supply is proposed.The ground source heat pump as a new type of sustainable utilization technology that can achieve heating in winter and cooling in summer has broad application prospects.However,due to the large seasonal temperature difference in Harbin,the soil temperature cannot be compensated and compensated,which will cause thermal imbalance in the soil temperature field,which is not conducive to the operation of the soil source heat pump system in the long run.In order to achieve the balance of the soil temperature field,the solution of the solar energy coupled soil source heat pump system is proposed,and related research is carried out.This article relies on a heating demonstration project in Harbin,with the help of Meteonorm to obtain typical meteorological data in Harbin,by optimizing the dynamic parameters of ground temperature,using TRNSYS to build a building load model and a soil source heat pump system model,and to compensate for the ground source heat pump system in severe cold Problem analysis.Through TRNSYS,the building's envelope structure and load demand time and other related parameters are set,and the heating time is set from October 20 to April 15,the cooling time:June 10 to August 20,other times are Transitional period.Through simulation,the maximum heat load of the building in winter is 317.43kW,the maximum cooling load in summer is 152.69kW,the maximum load ratio(winter:summer)is 2.08:1,and the cumulative load ratio(winter:summer)is 5.96.The thermal properties of the soil were measured by thermal response test experiments.The original soil temperature field was 15?,the thermal conductivity was 1.28W/(m.K),and the specific heat capacity of the soil was 2100kJ/(m~3.K);the simulation model of the soil source heat pump system was built by TRNSYS After one year of system operation,the soil temperature was 14.17?,a decrease of 0.83?.At the same time,on the basis of simulation,a soil source heat pump experiment was carried out based on a heating demonstration project in Harbin.The experimental results showed that the soil temperature was 14.89?after a week of heating,a decrease of 0.11?;the soil temperature field change was 14.31?by 8760h,and The initial temperature field decreased by 0.69?.It is 0.14?higher than the simulation result,within the acceptable error range,which proves the correctness of the ground source heat pump simulation system.After ten years of simulated operation of the ground source heat pump system,the soil temperature field was 11.89?,a decrease of 3.11?;the energy efficiency ratio of the system was reduced from 4.52 to 3.09;the existence of the problem of cold accumulation of soil was determined.The solar energy coupled ground source heat pump system.According to the degree of cold accumulation of the soil temperature field,the solar collector parameters are calculated,and the final area of the solar collector is 282m~2,the unit area flow is 0.072m~3/(h.m~2),the design flow is 20.304m~3/h,heat collection The inclination of the device is 55°81'.After the end of the entire cooling and heating cycle throughout the year,the soil temperature field was 14.91?,which was an increase of 0.6?compared with the single soil source heat pump system experiment,and the soil temperature field was14.80?after ten years of system operation,which was higher than the single soil source heat pump system.The temperature is 2.91?,which is only 0.2?lower than the original temperature field,which proves the feasibility of the solar energy coupled ground source heat pump system for ground temperature balance. |
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