The ground source heat pump system of UFIDA Software Park is a composite system-ground source heat pump+ice storage+conventional water chillers+gas boilers. Conventional water chillers and gas boilers are the working conditions of peak shaving equipment and heat pump units, which are used for cooling in summer, heating in winter and storing ice in the low power valley in summer. They were officially put into use in early 2117.

fig. 13-9 graph of monitoring data of ground temperature field at a heat exchanger well during the ice-making condition of the unit from June 5 to June 6, 2117

(1) fig. 13-9 shows the temperature change curve at a monitoring point during the ice storage of the heat pump unit from the evening of June 5 to the morning of June 6, 2117. It can be seen that the soil temperature gradually rises in the initial stage and then tends to be balanced because the heat pump unit discharges heat to the underground soil through the buried pipe.

fig. 13-11 graph of monitoring data of ground temperature field at heat exchanger well A on June 6, 2117

(2) fig. 13-11 shows the temperature change curve of some heat pump units (***4 heat pump units, at this time only 2 heat pump units are cooled, and the other 2 heat pump units are shut down) at the monitoring point A on the morning of June 6, 2117. It can be seen that the soil temperature at the monitoring point did not continue to increase at this time, but decreased slowly, indicating that the heat dissipation of the soil at the monitoring point to the surrounding soil is greater than that of the heat pump system, that is, the soil itself has strong resilience.

(3) Figure 13-11 shows the temperature change curve of the monitoring point at point A on the morning of June 6, 2117 after all the heat pump units stopped running. It can be seen that there is no heat discharged from the heat pump system to the underground soil at this time, so the soil temperature continues to decrease.

fig. 13-11 graph of temperature monitoring data of geothermal field at heat exchanger well A under the ice melting condition of ice tank on June 6, 2117

(4) fig. 13-12 shows the temperature change curve from 23:11 on June 9 to 23:11 on June 21, 2117, and the time period is from 23: 11 on June 9 to 7:11 on June 21. From 7:11 to 11:31 on June 21th, two heat pump units were operated under refrigeration conditions, and two heat pump units outside were shut down. From 11:31 to 23:11 on June 21th, all four heat pump units were shut down. It can be seen that when the heat pump system discharges heat to the underground soil, and when the heat discharge is greater than the soil's own recovery ability, the soil temperature will increase, and when the heat pump system stops discharging heat to the underground soil, the soil temperature will gradually decrease, and it will basically return to the original temperature of the soil when the next operation cycle comes.

fig. 13-12 temperature monitoring data curve of geothermal field at heat exchanger well A from 23:11 on June 9 to 23: 11 on June 21

(5) The above conclusions can also be confirmed from the continuous monitoring curve at point B (fig. 13-13), although the overall temperature of the curve tends to increase.

figure 13-temperature change curve of monitoring point at point 3b (June 17, 2117 ~ June 22, 2117)