Abstract
Electric heating and solid thermal storage systems (EHSTSSs) are widely used in clean district heating and to flexibly adjust combined heat and power (CHP) units. They represent an effective way to utilize renewable energy. Aiming at the thermal design calculation and experimental verification of EHSTSS, the thermal calculation and the heat transfer characteristics of an EHSTSS are investigated in this paper. Firstly, a thermal calculation method for the EHSTSS is proposed. The calculation flow and calculation method for key parameters of the heating system, heat storage system, heat exchange system and fan-circulating system in the EHSTSS are studied. Then, the instantaneous heat transfer characteristics of the thermal storage system (TSS) in the EHSTSS are analyzed, and the heat transfer process of ESS is simulated by the FLUENT 15 software. The uniform temperature distribution in the heat storage and release process of the TSS verifies the good heat transfer characteristics of the EHSTSS. Finally, an EHSTSS test verification platform is built and the historical operation data of the EHSTSS is analyzed. During the heating and release thermal process, the maximum temperature standard deviation of each temperature measurement point is 28.3 °C and 59 °C, respectively. The correctness of the thermal calculation of the EHSTSS is thus verified.
Highlights
In recent years, renewable energy utilization has developed rapidly in China
According to the thermal calculation process and method of the Electric heating and solid thermal storage systems (EHSTSSs) proposed in the paper, the physical model of the thermal storage system (TSS) is built
In the thermal storage process, the temperature variation of the TSS is shown in Figure 6 The temperature near the heating element is higher, and the temperature of the outlet section is more uniform
Summary
Renewable energy utilization has developed rapidly in China. the abandonment of the renewable electricity generation is serious, especially during the wintertime heating period [1]. The power output of CHP unit is greatly constrained by the heating load according to the principle of “power determined by heat” [2]. This has become one of the main reasons for the consumption of renewable energy in winter. The traditional coal-fired boiler heating system for urban and factory thermal energy supply can be replaced by the EHSTSS. It has become one of the effective ways to control air pollution. In the multi-energy system of combined cooling, heating and power, the thermal storage system can be used as an energy storage system and a thermal energy supply system [5]
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