| 요약2 |
The length of ground heat exchangers is a key factor in the stable operation of ground-source heat pump systems. Different design variables or parameters such as the thermal properties of the ground and heat pump efficiency are considered in sizing ground heat exchangers. Among these, building heating and cooling loads are one of the most significant. However, a variety of uncertain parameters in the building simulation process makes it difficult to reliably estimate building heating and cooling loads. This study investigated the effects of uncertainty in estimating building heating and cooling loads on the sizing of ground heat exchangers, by considering the impact of changes in infiltration rate on these load and consequently on the size of the heat exchanger. EnergyPlus 9.4 was used to estimate the heating and cooling loads of a mid-rise residential building and GLHEpro 5.0 was used to determine the total length of ground heat exchangers. The results show that an increase in the infiltration rate caused an increase in peak building heating and cooling loads. Consequently, the required length of ground heat exchangers calculated by each zone and model differ. Additionally, sensitivity of the size of ground heat exchangers to changes in infiltration rate varied with different patterns of peak and yearly building loads. Therefore, sensitivity analysis of the major parameters used for estimating building heating and cooling loads is needed to ensure that the sizing of ground heat exchangers is robust. |