Uncertainty design method for heat exchanger

Abstract

The invention provides an uncertainty design method for a heat exchanger. Sensitivity analysis is performed on the influences caused by various uncertainty factors related to design of the heat exchanger; the influences caused by a physical model, a pneumatic thermal parameter, geometric dimensional deviation, a machining error, assembling accuracy and the like can be considered; the influence of a single uncertainty factor can be calculated and the comprehensive influences of the various uncertainty factors can be calculated as well; according to the actual requirement, the main influence factors in the factors can be found out so that the calculated amount can be reduced; meanwhile, each main influence factor is considered for conducting uncertainty calculation; a quantitative relation between the confidence coefficient and the heat exchange area of the heat exchanger is established. By the adoption of the designed heat exchanger, the situation that the performance cannot reach the standard in the actual work process is avoided, the weight increase caused by the heat exchanger is reduced as much as possible, and cost is effectively saved. The high requirement of the aerospace field for the performance of the heat exchanger is met and the heat exchanger can be widely applied to other fields.

Description

technical field [0001] The invention relates to an uncertain design method of a heat exchanger, belonging to the technical field of heat transfer. Background technique [0002] A heat exchanger is a device that transfers heat from one heat-carrying medium to another. Due to the different performance requirements of heat exchangers in various industries, various forms of heat exchangers have gradually been produced, which are widely used in petroleum, chemical industry, metallurgy, electric power, shipbuilding, central heating, refrigeration and air conditioning, machinery, food, pharmaceuticals and other fields , the aerospace field also has an urgent demand for high-reliability lightweight heat exchangers. [0003] In the design of heat exchangers, most of the design parameters themselves have uncertainties, such as the aerothermal parameters of the working fluid, the size of the heat exchange unit, the thermal conductivity of solid materials, and the thermophysical proper...

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Problems solved by technology

However, the selection of the insurance factor depends entirely on the subjective judgment of the designer, and there is no guarantee that the heat exchanger can complete the design task; Significantly increased, resulting in unnecessary waste

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