Research >> 1. Energy Saving from HVAC System >>Ongoing commissioning of HVAC system with seasonal underground thermal storage system


■ Ongoing Commissioning of HVAC System with Seasonal Underground Thermal Storage System


□ Optimal Operation For HVAC System with Seasonal Underground Thermal
 Storage System

We develop a simulation tool to test and optimize the performance of an HVAC system with seasonal thermal storage. The tool consists of physical models of a ground-coupled thermal storage system through which heat is exchanged between circulated water in tubes embedded in building foundation piles and the ground, and components of an HVAC system, such as cooling towers, cooling coils, pumps, etc. The results of applying the tool to a real building system are reported as a commissioning process to test system performance and improve operation strategies. Compared with the performance of the system in the 1st year, the efficiency of storage operation is improved from 7.9 to 12.2, and the efficiency of discharge operation is improved from 7.1 to 13.7. If the operational methods proposed by the tool are adapted, the system COP can be improved from 3.06 to 5.16



Figure-1 Seasonal underground thermal storage system



Figure-2 Result of the soil temperature simulation by ANSYS