| Due to the long-term continuous operation of the soil-source heat pump(GSHP)system,the heating performance coefficient of the heat pump unit is reduced,and sometimes it cannot even meet the heating demand of buildings.This problem is more obvious in the cold region,especially in the case that the soil-source heat pump is only responsible for heating in winter and not running in summer.With the continuous development of higher education in China,the scale of new and expanded campuses around cities has been rapidly expanding.There are a large number of personnel in campus buildings,so there is a high requirement on the comfort level of personnel using space in campus buildings.At the same time,due to the large number and volume of campus buildings,the annual energy consumption is quite huge,so it is extremely urgent to build an energy-saving campus.Based on the survey of the current situation of campus buildings in China,the application of GSHP system is deeply studied.To explore the common characteristics of GSHP system operation in different campus buildings,the influence factors of system operation effect are preliminarily screened out,and the characteristics of energy use of each functional building and the typicality of cold and hot load of campus buildings are summarized.The applicability of GSHP system in campus buildings is discussed to ensure that the system has significant energy saving and emission reduction effect.For the campus office building,ST building is selected as an example building.The energy system in the example building is taken as the research object,through the continuous measurement and data collection of the soil-source heat pump system,the paper analyzes the heating operation characteristics of the soil-source heat pump system,explores the actual heating effect of the soil-source heat pump system in the example building,and diagnoses problems in system operation.Based on the existing conditions,the operation strategy of soil-source heat pump system was changed.The water temperature characteristics,operation efficiency,indoor temperature changes and other factors of soil-source heat pump system in the building were taken as examples to compare and analyze the operation characteristics of soil-source heat pump system under different operating strategies in different years.The entropy weight method is used to calculate the index weight of factors influencing the system operation characteristics,and the genetic algorithm is used to explore which operation strategy is more efficient and energy saving.Compared with the measured results,the accuracy of the genetic algorithm was verified,and find out the optimal operation strategy of the soil-source heat pump system.According to the local climate conditions,the simulation software was used to compare the operating state of the system under the actual strategy and the optimal strategy for 10 years,and the energy saving potential of the system under the optimal strategy was analyzed from the aspects of energy saving,economy and environmental protection.The results show that GSHP heating system adjusts the operation strategy by changing the number of units open and the size of the unit operating load rate,heat pump COP increased by 1.15 on average,investigate the system average increased by 0.46,host power consumption reduced by 8.3%,the system power consumption reduced by 10.8%,energy-saving effect increase 18%and 20%respectively,soil source heat pump system is more energy efficient.The optimal operation strategy of the soil-source heat pump heating system and the parameter values of its optimal solution.The circulating water flow rate on the ground source side was 21.99m~3/h,and the circulating water flow rate on the user side was79m~3/h.The inlet water temperature on the ground source side was 5.78?,and the outlet water temperature on the user side was 34.49?.This optimal strategy has strong operability and has important guiding significance for the application of soil-source heat pump system in campus buildings. |
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