Method for obtaining optimal heat preservation thickness of heating directly-buried heat distribution pipeline based on * economy

Abstract

The invention discloses a method for obtaining the optimal heat preservation thickness of a heating directly-buried heat distribution pipeline based on economy. The method comprises the steps: firstly, calculating the annual heat loss of the pipeline in the whole heating season for the heating directly-buried heat distribution pipeline; secondly, calculating loss caused by pipeline heat loss, smoke loss provided by unit mass fuel and smoke loss of the unit mass fuel, and further obtaining fuel consumption in the whole heating season; obtaining the annual cost of the fuel according to the consumption of the fuel in the whole heating season, and calculating the annual total cost according to the annual cost of the fuel and the annual conversion cost of the thermal insulation material; and establishing a mathematical model for solving the optimal heat preservation thickness of the pipeline by taking the minimum annual total cost as a target, and obtaining the optimal economic heat preservation thickness by solving the established mathematical model. According to the method, the heat preservation thickness of the heating directly-buried double pipes is optimized based on economy, and the contradiction between energy saving and money saving is solved.

Description

technical field [0001] The invention relates to the technical field of heating engineering, in particular to an economical method for obtaining the optimal insulation thickness of directly buried thermal pipelines for heating. Background technique [0002] Defined as the maximum available work of the system at a specific ambient temperature. The analysis combines the first and second laws of thermodynamics to improve the efficiency of the energy system. This is undoubtedly a step further than the energy analysis method of the first law of thermodynamics alone. From the perspective of thermodynamics, heat electrical energy Thermodynamic performance and chemistry etc., are equivalent; but from an engineering point of view, they are not equivalent. For example, for 1kJ of coal chemical and 1kJ of electrical energy their The values ​​are the same, but in actual engineering, their respective economic costs are not the same. therefore in progress When analyzing...

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Problems solved by technology

[0003] In the prior art, there is an economical optimization of the insulation thickness of the heating overhead single pipe, but these solutions have some shortcomings: first, the research on the insulation thickness of the overhead pipe is concentrated, and there are few studies on the directly buried pipe; second, in the ongoing When calculating the heat loss of pipes, only the heat loss of a single pipe is calculated, and the heat loss of double pipes is not calculated, let alone the temperature interaction between pipes; thirdly, the design parameters of the system are used in the calculation process , without taking into account that these parameters are constantly changing during the heating season

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