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Exergy Efficiency Synthesis and Cost-effective Mold Construction of Trough Vacuum Heat Pipe Collector

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网责任编辑: 作者: 人气: Article Source: Network Editor: Author: Popularity: Issuing time: 2015-07-07 20:09:33

Exergy Efficiency Synthesis and Cost-effective Mold Construction of Trough Vacuum Heat Pipe Collector
Exergy efficiency synthesis of trough vacuum heat pipe collector
Exergy is based on conditions to weigh the physical quantities of working fluids (mainly gas and liquid) for work. It can usually be illustrated as
E = (H-H0) -T (S-S0) (5)
Among them, H0 and S0 are the enthalpy and entropy in the conditional state, so the theory can not be reversed internally. This cannot prevent the useful energy from being destroyed in the internal medium. The change of the comprehensive exergy parameters is to reduce this financial loss. Invalid path.
Suppose the wall surface heat of the vacuum tube is T1, the conditional heat is T0, the heat of the heat collecting medium is Tg, and the exergy Ein of the heat of the output collector is:
Ein = Qs (1-T0 / T1) (6)
The input exergy of the collector is the exergy Eout of the input feed water boost heating:
Eout = Qu (1-T0 / Tg) (7)
Therefore, the exergy efficiency of the collector is
& eta; e = Eout / Ein = Qu (1-T0 / Tg) / Qs (1-T1 / T0) (8)
Construction of Cost-Effective Mold for Trough Vacuum Heat Pipe Collector
The collector substrate is made of stainless steel mirror panel processing, albedo & rho ;, and the area for collecting impurities is Ac = 2m2. The length of the vacuum tube is L = 1.5m, the inner hole diameter is Dr = 0.04m, and the outer diameter De = 0.058m. The attraction rate & alpha; r = 93%, emissivity & epsilon; r = of the attractive attracting coating (Al-N / Al) are selected. 6%, the heat pipe is an oxygen-free copper pipe, the length of the volatile section Le = 1.4m, the length of the condensing section Le = 0.1m, and the diameter of the shell D = 0.008m. Where a certain period of time is selected to continue the integration, the surrounding conditions heat ta = 30 ° C, wind speed v = 5m / s, sky heat t = 25 ° C, uniform heat collection tr of the vacuum tube collector tr = 200 ° C.
Cost-effective consequences and integration
Because the thermal efficiency of the collector is greatly affected by its own choice of materials, structural design, and lighting conditions, in order to facilitate the synthesis, understanding of the collector's concentration ratio and exposure to the heat collection efficiency and exergy efficiency, Bai Wen adopted the heat The imbalance method continues to be cost-effective to correctly reflect the relationship between parameters and efficiency.
Through the substitution of the above parameters and the introduction of experimental data, the loss of heat collection efficiency and light concentration ratio, exergy efficiency and light concentration ratio, and the time difference between heat collection efficiency and heat collection fluid (water or steam) can be lost. .
It can be found through cost-effectiveness that the thermal efficiency curve of the collector tends to be unified with the exergy efficiency curve. Under the condition of selecting the contrast ratio of the light concentration, they all increase sharply and then flatten, and the light concentration ratio becomes smaller and smaller. . It is conceivable that if the concentration of light is increased more than successively, there is no need for both to feel that there is no more. Simultaneously, it can be found that under the condition of condensing ratio, the greater the intensity of illumination, the higher the corresponding heat collection efficiency and exergy efficiency. Therefore, the fair spotlight ratio is chosen, and the disadvantages of the maritime illuminated resources are exhibited. There is a certain guiding meaning in the design and improvement of the collector structure in the future. With the increase of the time difference of the pressure rise of the heat collecting fluid (water or steam), the heat collection efficiency of the heat collector generally tends to increase. Under the opposite time difference condition, the greater the intensity of the illumination or the light-gathering ratio, the more turbulent the tendency of the curve to rise, and the more rugged it becomes. Therefore, the loss of the high temperature of the heat collector will also increase the efficiency of the collector itself.
thesis
After the above cost-effective synthesis, the same conclusion is lost:
(1) In a certain concentration ratio, the heat collection efficiency and exergy efficiency of the collector increase with the increase of the concentration ratio, and then the increase is smaller and smaller, and eventually flattens;
(2) Under the condition that the concentration ratio is absolutely low (within 100), the greater the intensity of moonlight illumination, the greater the thermal efficiency and exergy efficiency of the collector. However, with the increase of the light-concentration ratio, the intensity of the illumination intensity on the heat collection efficiency becomes smaller and smaller. It can be found that if the intensity of the illumination continues to increase, the heat collection efficiency may decrease.
(3) The vacuum tube-heat tube collector is adopted, and the gap between the inner tube of the vacuum tube and the heat tube is filled with a heat-conducting medium.
(4) The popularity of heat sources will come at the expense of the thermal efficiency of the entire heat collection system. Therefore, in theoretical utilization, it is often redundant to comprehensively consider the relationship between the heat collection efficiency and the required heating temperature rise.
Other relevant chapters:
Structure of novel trough vacuum heat pipe collector
Thermal efficiency synthesis of trough vacuum heat pipe collector
Exergy Efficiency Synthesis and Cost-effective Mold Construction of Trough Vacuum Heat Pipe Collector

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