Abstract
In order to analyze the influence of fault buried pipes on the operation of ground source heat pump system, a simulation model of unit considering both the influence of inlet fluid flow and temperature is developed, which is coupled with the three-dimensional dynamic model of 3 × 3 pipe group. The results show that the influence degree caused by different blocked positions is basically same. When one, two and a group of pipes are blocked, the annual power consumption of unit increases by 3.78%, 8.81% and 15.91% respectively. Besides, the system annual average coefficient of performance decreases from 3.28 to 3.21, 3.12 and 2.98. The ratio of cooling to heating load demands studied is 1.44, and the pipe blockage exacerbates the soil thermal imbalance, which cause a continuous deterioration of cooling performance. When the cooling load is high, the system is difficult to meet the demand. Because of design margin of total length, the time for not meeting the cooling demand after blocking one pipe is the same as normal condition, but the time after blocking two and a group of pipes increases 37.5 h and 88.5 h. Moreover, the amount for not meeting the demand increases 25.4%, 52.11% and 129.94% on average respectively.
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