Study on Energy Management Method Utilizing Simulation at Operative Stage: Part 2——Examination of Operation Improvement during Heating Season for a Heat Source System with

摘要

Water Thermal Storage and Co-generation in a Hospital Synopsis： The purpose of this study is to develop a method to investigate the reduction of energy consumption of the operation phase of a hospital using a simulation. In this study, the improvement of the operation of the heat source system and secondary system in winter were investigated using the simulation. In the hospital investigated in this study, air source heatpump, gas driven and steam driven absorption chillers, steam boiler, and water thermal storage tank are installed as heat sources for heating and domestic hot water supply. Exhaust hot water and steam from the electric generator (CGS exhaust hot water and exhaust steam hereafter) can also be utilized. Secondary system is divided into a four-pipe system and a two-pipe systems, in the latter, heating is supplied for 24 hours. For the two-pipe system, hot water is supplied from the water thermal storage tank, and the heat is stored by the air source heatpump and/or CGS exhaust hot water. Furthermore, CGS exhaust hot water can be supplied to the domestic hot water system with CGS exhaust steam and boiler. In this study, the optimal operation of the air source heatpump, CGS exhaust hot water, exhaust steam, steam boiler for the heating load of the two-pipe system, and the domestic hot water supply load are examined. For the secondary side, the energy saving effect of the transportation power by optimizing the temperature difference was examined. The examination was carried out for one week in February when the heating load was heavy, and in March, when it was relatively small. By simulation, it was shown that the conveying power can be reduced by optimizing the temperature difference in the secondary system. Further, it was found that the primary energy consumption can be reduced by changing the heat source of the thermal storage from the CGS exhaust hot water to nighttime operation of air source heatpump and the use where CGS exhaust hot water is supplied. It is expected that the energy consumption will be further reduced by changing the operation of the CGS corresponding to the operation improvement of the heat source system and the secondary side system. Therefore, the influence of changing the electric power load and the use of the CGS exhaust heat to control of the optimal operation of the generator was investigated in this study. It was found that it is possible to further reduce energy by the optimization of the control value of the CGS according to a load after the improvement of the operation of heat source system and secondary system.