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Outline
In order to investigate the influence of structural parameters on the flow characteristics in the ejector and to evaluate the performance of the ejector heat pump system under different working conditions, this study constructed a three-dimensional model of the ejector and a mathematical model of the ejector heat pump system, investigated the influence of geometrical parameters, such as the ejector throat diameter (Dt) and the throat-orifice position (Nozzle Exit Position, NXP), on the performance of the ejector and analyzed the influence of the different working conditions (The effects of different operating conditions (evaporating temperature Te, condensing temperature Tc, and generating temperature Tg) on the system performance and injector characteristics were analyzed. It is found that increasing Dt can significantly improve the pressure rise ratio of the injector, but it will lead to the reduction of the elicitation coefficient, and the pressure rise ratio decreases with the increase of NXP, and the elicitation coefficient reaches the peak value at NXP=7 mm. When Tc is 40 ℃ and Tg is 70 ℃, the system cooling coefficient (Coefficient of Performance (COP)) increases from 0.94 to 2.64 as Te increases from 0 ℃ to 15 ℃, the pressure rise ratio of the injector decreases from 1.61 to 1.31, and the priming coefficient increases from 0.51 to 0.89. Among them, the optimization of Dt and NXP can significantly improve the pressure-to-lift ratio and the elicitation efficiency, while the reasonable matching of Te, Tg and Tc plays a decisive role in the system performance.
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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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