| Ground source heat pump system and ice storage system are both technologies encouraged by energy policy nowadays,and they have their advantages and disadvantages.Ground source heat pump system can provide cooling in summer and heating in winter,but can not make use of peak-valley electricity price difference.Many studies have been carried out on this system.Ice storage system can make use of peak-valley electricity price difference but can not provide heating in winter.We can integrate the two and play up their respective strength.Taking an office building in Beijing as the research object,this paper designs and simulates the combined system of ground source heat pump and ice storage,and compares the electric refrigeration plus gas boiler system and ice storage plus gas boiler system to analyze the energy consumption and economy of the combined system.Firstly,the dynamic loads of the building are calculated by using the HY-EP software with EnergyPlus as the core.The hourly loads,monthly cumulative heat and cold loads and annual cumulative heat and cold loads are obtained,which provide the basis for the scheme design and energy consumption analysis of the system.Secondly,the combined system of ground source heat pump and ice storage is designed and calculated.The combined system diagrams of three kinds of ground source heat pumps and ice storage systems are established.Taking the combined system of upstream series ice storage system of base-mounted host and ground source heat pump as an example,the design and equipment selection of the combined system are carried out.Then,the calculation model of the combined system of ground source heat pump system and ice storage system is established in EnergyPlus,and the results of design calculation and control strategy are set up in the model.Then the simulation calculation of the combined system is carried out,and the calculation results of room temperature,water supply temperature,ice storage system outlet temperature and cooling tower outlet temperature are output to check the calculation results.Finally,two comparative systems of conventional electric refrigeration plus gas boiler system and ice storage plus gas boiler system are established in HY-EP software.The energy consumption and economy of the combined system of ground source heat pump and ice storage are compared with those of the two comparative systems.The results show that the energy consumption of air conditioning system and heating system of the combined system of ground source heat pump and ice storage is lower than that of the two comparative systems.The operation cost is also the lowest.The three systems mentioned above are analyzed and evaluated economically by the static life method of one-time investment recovery.Compared with the conventional electric refrigeration plus gas boiler system,the investment recovery period of the combined system of ground source heat pump and ice storage is 4.1 years,and the recovery period is suitable. |
