抄録
A high-efficiency aquifer thermal energy storage cooling and heating system with solar collector installed in Yamagata City was constructed and put into operation. In actual operation, 100% of pumped groundwater could be injected. In the heating operation in the winter of 2016-2017, the number of operating days was 187, and 83,420 MJ of cold energy was stored in the aquifer. In the cooling operation in the summer of 2017, the number of operating days was 125 days. The combined use of solar collectors was started from the time of the cooling operation, and 103,078 MJ thermal heat was stored in the aquifer by passing the groundwater after heat exchanged in the primary through the solar collectors (heat collection area: 160 m2). In the heating operation between 2017 and 2018, the number of operating days was 201, and 159,075 MJ of cold heat was stored in the aquifer by using this solar collector in combination. Effects of the aquifer heat storage were observed at the pumping temperatures during operation, and the COP and SCOP were improved by about 0.7. As described above, the system is called a highly efficient system because it can efficiently utilize the heat storage in the aquifer and the heat storage effect by using the solar collector in combination. A three-dimensional
groundwater flow heat transport model was constructed based on the boring data, and the simulation was carried out. Simulations were carried out using the operation data as input data, and the transition of the temperature change in the aquifer due to the operation of the ATES system was visually reproduced three-dimensional groundwater fluidized heat transport simulations have shown that the heat stored in the aquifer can be effectively utilized for subsequent heating or cooling operations.
