A Quantitative Evaluation Method for Temperature Deviation of Trough Solar Collector Field
A trough solar energy, quantitative evaluation technology, applied in the direction of design optimization/simulation, etc., can solve the problems of trough heat collector tube rows, flow velocity, outlet temperature instability, and decrease of flow velocity in the tube, etc.
Active Publication Date: 2021-07-27
NANJING INST OF TECH
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Problems solved by technology
If the pressure head of the first row is kept constant, as the number of rows increases, the farther the distance from the first row of heat collecting tubes is, the smaller the pressure head of the heat collecting tube row will be, which will lead to a decrease in the flow velocity in the tube and a higher temperature rise at the outlet.
Finally, the flow rate and outlet temperature of each row are not constant between the rows of trough collector tubes
Method used
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[0027] Combine below figure 1 The present invention is described further.
[0028] The patent of the present invention designs a calculation method for evaluating the outlet temperature deviation between the tube columns of the trough heat collecting field;
[0029] The trough solar heat collection field is usually composed of heat exchanger, cold main pipe, hot main pipe, pump and several solar heat collection loops, such as figure 2 . Assume that there are 4n heat collection loops in the heat collection field, 2n heat exchangers on the east and west sides of the heat exchanger, n heat collection loops on the south side and north side of the cold and heat main pipes in the east, and n heat collection loops in the west cold side. 1. There are n heat collecting loops on the south side and north side of the heat mother pipe respectively. Taking the heat collecting field on the south side of the cold and hot main pipes on the west side as an example, the cold and hot main pip...
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The invention discloses a method for quantitatively evaluating the temperature deviation of a trough-type solar heat collection field, which includes: establishing a thermal balance model of a heat-collecting unit of a trough-type solar heat The average temperature of the heat transfer fluid in each heat collector tube loop is calculated to obtain the flow rate of the heat transfer fluid in each heat collector tube loop. Combined with the heat balance model of the heat collector unit, that is, the heat balance relationship, the outlet temperature and the average temperature of the heat transfer fluid in each heat collector tube loop are calculated. Whether the absolute deviation between the calculated average temperature of the heat transfer fluid in each heat collection loop and the assumed value is within 0.5°C, if so, then end the calculation, obtain the outlet temperature of the heat collection tube loop, and compare the outlet temperature deviation; if If not, re-assume the average temperature of the heat transfer fluid in each heat collection loop, and iterate. The invention realizes accurate calculation of the outlet temperature and deviation of the heat collecting pipe loop.
Description
technical field [0001] The invention relates to the technical field of new energy, and is applicable to a method for quantitatively evaluating the temperature deviation of a trough-type solar heat-collecting field for quantitatively evaluating the temperature deviation of a heat-collecting field in a trough-type solar heat-collecting system. Background technique [0002] Energy is the foundation of modern social and economic development. my country's unique resource endowment determines that coal-fired power generation will dominate the energy system for a long time. On the one hand, with the increase in population and quality of life, the consumption of traditional energy is increasing day by day; on the other hand, coal combustion is the most important source of air pollutant emissions in my country. In order to solve this problem, many countries in the world have put the development and utilization of renewable energy on the agenda. Solar energy is a clean, low-cost, sus...
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IPC IPC(8): G06F30/20
CPCG06F30/20
Inventor 吴俊杰梁绍华张翠珍韩宇宋莹裘浔隽许万军
Owner NANJING INST OF TECH