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For the accumulator filled with phase change material thermal conductivity is low, heat storage time is long and other shortcomings, this paper establishes the concentric triplex tube regenerative heat exchanger builtin intermittent twisted fin model, the use of Fluent software for the melting process of the internal phase change material for the threedimensional unsteady numerical simulation of the structure of the structure of the different twisted fin number and the degree of twisted degree, analyze the phase change material liquid phase rate, the average temperature, the amount of heat storage and the average heat storage rate rule of law with time. Simulation results show that in this paper, compared with the triplex tube regenerative heat exchanger within the research parameters, with the increase of the degree of twist, the complete melting time is gradually shortened, when the twist rate is 2.5, the complete melting time can be reduced by up to 33.1%, with the increase in the number of twisted fins can also shorten the complete melting time, when the number of twisted fins is 4 complete melting time can be reduced by a maximum of 25.6%. The inclusion of intermittent twisted fin significantly shortens the complete melting time of the phase change material and enhances the heat storage capacity, which helps to improve the comprehensive heat storage performance of the triplex tube regenerative heat exchanger.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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