Design and optimized operational strategy of a district cooling and heating system based on ground source heat pumps.

Paper published in poster form during the conference. A comprehensive district heating and cooling (DHC) system design is presented. Large-scale ground source heat pump (GSHP) with thermal energy storage system is applied in the DHC system. Normally, the compressor of a ground source heat pump works at a very wide range of compression ratios, and thus the annually overall performance is comparatively low. Through simulation evaluation, the annual cooling and heating performance of the ground source heat pump is enhanced by increasing the mean temperature of the ground and thus narrowing the work range of compression ratios. The hourly operation strategy of the heat pumps and thermal storage system is proposed to decrease the energy cost and match the tiered pricing of power consumption. In addition, heat pumps always work near the maximum efficiency point by utilizing the coordinated thermal energy storage system.

本文以海报形式于学术会议中发表。文中提出一套完整的区域供冷供热（district heating and cooling, DHC）系统设计方案。该区域供冷供热系统采用集成蓄热系统（thermal energy storage system）的大型地源热泵（ground source heat pump, GSHP）。通常情况下，地源热泵的压缩机工作在极宽的压缩比范围内，因此其全年综合性能相对偏低。经仿真评估，通过提升岩土平均温度以缩小压缩比的工作区间，可有效提升地源热泵的全年供冷与供热性能。本文提出热泵与蓄热系统的小时级运行策略，以降低能源成本并适配阶梯式电价机制。此外，通过协同调控蓄热系统，可使热泵始终工作在最高效率点附近。