Optimization Of Coupling System Of Ice Storage And Ground Source Heat Pump

Energy consumption in buildings accounts for 40% of the total energy consumption in China,while energy consumption of air conditioning system accounts for more than 60% of the total energy consumption in buildings,so it has become the focus of energy conservation and consumption reduction.The ice storage system uses the trough price to store cold capacity during the night trough power period,which can save the operation cost and play the role of "peak cutting and valley filling",but can not provide heat;The ground source heat pump system uses geothermal energy,a renewable energy source,as the cold and heat source of the building.The coupling of ice cold storage and ground source heat pump system can achieve the role of learning from each other.Taking an office building in Beijing as an example,this paper optimizes the coupling system of ice storage and ground source heat pump,and analyzes its energy saving and economy.Firstly,Design Builder software was used to simulate the dynamic load of the building throughout the year to calculate the hourly cooling and heat load,typical design daily load and cumulative cooling and heat load of the building throughout the year,which served as the basis for the system operation strategy and equipment selection.Secondly,the operation system diagram of ice storage and ground source heat pump coupling system is established.In this topic,the upstream tandem ice storage and ground source heat pump coupling system is selected.The operation strategy of the coupling system under four different typical load days in summer was analyzed and the main equipment selection was carried out.Thirdly,TRNSYS simulation software was used to establish the coupling system model of ice storage and ground source heat pump.The main parameters and control parameters were set in the calculation model,and the system simulation calculation was carried out.The output of load side,buried pipe and cold storage tank inlet and outlet temperature,room temperature,system cooling heat production,etc.,was verified to verify the accuracy of the simulation.The output of soil heat absorption and discharge and the average soil temperature after 15 years of system operation,this paper by adding cooling tower to adjust the soil heat balance;Output system operation energy consumption and operation cost.In the end,TRNSYS simulation software is used to establish three comparison systems: conventional electric refrigeration and gas boiler,ice storage and gas boiler,and simple ground source heat pump.The energy saving and economy of the ice storage and ground source heat pump coupling system is compared with these three systems,and the initial investment and annual operating cost of the system are calculated.Using two economic evaluation methods of life cycle cost and initial investment recovery period,it is concluded that the coupling system of ice storage and ground source heat pump has good energy-saving and economic advantages.