A thermal design method for heat exchanger system
A technology of thermal design and heat exchangers, applied in instrumentation, calculation, electrical digital data processing, etc., can solve problems such as difficulty in realizing mass flow, flow velocity or Reynolds number, affecting heat exchange characteristics of heat exchangers, etc.
Active Publication Date: 2019-08-23
XI AN JIAOTONG UNIV
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Problems solved by technology
In the actual heat exchanger system, due to the mutual influence of the resistance characteristics of the fluid drive device, the resistance characteristics of the heat exchanger, and the flow rate of the working fluid, which in turn affects the heat transfer characteristics of the heat exchanger, different heat transfer characteristics in the heat exchanger system conditions where it is difficult to achieve a given mass flow rate, flow rate, or Reynolds number when paired with a fluid drive
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[0030] 1. The calculation step of the traditional thermal design method of the heat exchanger is the efficiency-heat transfer unit number method. The specific implementation method is as follows. figure 2 Shown:
[0031] Known conditions, thermal parameters include heat exchanger geometry parameters, flow heat transfer characteristics of heat exchanger, cold fluid inlet temperature T ci and thermal fluid inlet temperature T hi , cold fluid drive and hot fluid drive.
[0032] 1) Calculate the heat transfer area A of the heat exchanger according to the geometric structure parameters of the heat exchanger in the given heat exchanger system;
[0033] 2) According to the resistance calculation formula of the heat exchanger and the resistance calculation formula of the connecting pipe, the resistance-flow relationship of the internal cooling fluid in the heat exchanger system is obtained and the resistance-flow relationship of thermal fluid According to the selected cold flui...
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The invention discloses a thermodynamic design method for a heat exchanger system. The method comprises: firstly, determining a geometric structure parameter of a heat exchanger in a heat exchanger system; according to resistance calculation formulas of the heat exchanger and a pipeline, respectively obtaining resistance-flow relations of a cold fluid and a hot fluid in the heat exchanger system; then, combined with the resistance-flow relations of the cold fluid in the heat exchanger system and resistance-flow relations of a cold fluid driving device, and combined with the resistance-flow relations of the hot fluid in the heat exchanger system and resistance-flow relations of a hot fluid driving device, respectively obtaining operating point flow of the cold fluid and hot fluid in the heat exchanger; finally, using the operating point flow of the cold fluid and the operating point flow of the hot fluid in the heat exchanger to respectively replace given flow of the cold fluid and hot fluid in calculation steps of a conventional thermodynamic design method for a heat exchanger or in a heat exchanger conventional optimization process, to perform thermodynamic design calculation. The thermodynamic design gives consideration for the resistance-flow characteristics of the fluid driving devices and the heat exchange system, and is more suitable for engineering application.
Description
technical field [0001] The invention relates to a thermal design method of a heat exchanger system, in particular to a coupling thermal design method of a heat exchanger and its application system and a fluid drive device. Background technique [0002] The thermal design of heat exchangers usually adopts the logarithmic average temperature difference method and the efficiency-heat transfer unit number method. According to the required thermal parameters, the thermal design process is divided into check calculation and design calculation. The optimization of heat exchangers often uses genetic algorithm, particle swarm algorithm or ant colony algorithm. [0003] The above heat exchanger thermal design method and optimization process are carried out under the premise of a given mass flow rate, flow rate or Reynolds number. In this paper, they are called traditional thermal design method and traditional optimization process. The main reason is that in During the thermal design ...
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IPC IPC(8): G06F17/50
Inventor 王秋旺萨仁满都呼马挺曾敏
Owner XI AN JIAOTONG UNIV