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Experimental study of a large temperature difference thermal energy storage tank for centralized heating systems

Sun Jian (North China Electric Power University, School of Energy, Power, and Mechanical Engineering, Beijing, China)
Hua Jing (Tsinghua University, Department of Building Science, Beijing, China)
Fu Lin (Tsinghua University, Department of Building Science, Beijing, China)
Zhang Shigang (Tsinghua University, Department of Building Science, Beijing, China)

Decreasing the backwater temperature of the primary pipe in a centralized heating system is one successful way to increase the heating capacity and recover different kinds of industrial low-grade heat from the system. A new system combining an energy storage tank and a heat pump is introduced in this study as the key device in this system, so the temperature difference of this thermal storage tank could be over 25⁰C. To improve the thermal energy storage tank design, a mathematical model considering disturbance factor is given, an experimental system is built, and good agreement is found when the experimental results are compared with simulation results.

Keywords: thermal energy storage, turbulence factor, thermocline, thermocline