18 May 2017
The dynamic performance of the whole year for Ground Source Heat Pump(GSHP) system is simulated using the software TRNSYS. The model of GSHP is built and economic performances are the object of optimization. The results show that: in the operation mode of using energy storage firstly, when the capacity of the heat pump is constant, the lager the storage water tank, the less the running cost. The payback period is increasing with the volume of the storage tank increases. When the storage proportion is less than or equal to 25%, the payback period of the coupled system is less than 5 years. As the storage proportion is varies from 10% to 100%, under the principle that meet the energy storage requirement and load requirement, when the storage proportion is 40%, the annual cost is the least, the economy of the coupled system is the optimal. When the storage proportion is less than or equal to 60%, the annual cost of the coupled system is all less than conventional ground source heat pump system.