5 results about "Steady state heat transfer" patented technology

The invention discloses a ground source heat pump heat exchanger coupling performance simulation algorithm based on an unsteady-state numerical model, and the algorithm comprises the following steps: S100, designing a triple iteration algorithm, and achieving the simulation of receiving the load of a heat exchanger and calculating the on-way temperature and the pipe wall temperature of a fluid at each time step; step S200, designing a quadruple iterative algorithm to realize simulation of receiving heat pump load, calculating fluid on-way temperature and pipe wall temperature, and calculating backfill and rock-soil temperature; according to the method, the assumption of steady-state heat transfer in the hole is abandoned, and the unstable-state heat transfer models are established in fluid, pipe walls, backfill materials in the hole and rock soil areas outside the hole, so that the method is more in line with physical practical conditions and can accurately accord with measured values even in 30s-level short-time-step simulation.

The invention relates to the technical field of data monitoring, in particular to a building external envelope thermal insulation performance monitoring data fusion method and system. A cloud server obtains a first real-time temperature value collected by a first temperature sensor and a second real-time temperature value collected by a second temperature sensor, then abnormal values in the first real-time temperature value and the second real-time temperature value are removed, and therefore the corrected first real-time temperature value which can better represent the internal temperature condition of a building is obtained. The corrected second real-time temperature value can better represent the external temperature condition of the building, so that the space coverage and the reliability of the data are effectively improved; and then the cloud server firstly constructs a one-dimensional steady-state heat transfer model, and then dynamically corrects the one-dimensional steady-state heat transfer model by using an irradiance correction coefficient and a wind speed correction coefficient, so that the influence of external environmental factors on a thermal insulation performance monitoring result is effectively eliminated, the monitoring result is closer to an actual situation, and the monitoring precision is improved.

The invention discloses a meshless EFGM-based topological optimization method for a multi-material periodic steady-state heat transfer structure. The method comprises the following steps: (1) inputting material attributes such as a heat conductivity factor, a material direction angle, a volume fraction ratio and a heat conductivity coefficient of the multi-material periodic structure; (2) discretizing a design domain by using a meshless method, and carrying out EFGM multi-material steady-state heat transfer analysis; (3) setting iteration parameters and an initial multi-material EFGM node relative density matrix; (4) solving an EFGM discrete control equation after punishment of the SIMP multi-material interpolation model; (5) establishing a topological optimization mathematical model of the multi-material periodic steady-state heat transfer structure based on EFGM; (6) performing periodic averaging processing, and solving volume sensitivity and thermal flexibility sensitivity; (7) optimizing and updating a multi-material EFGM node relative density matrix through two-phase competition; (8) inputting a termination condition, and judging whether loop iteration is continued or not; and (9) outputting a multi-material distribution cloud picture. According to the method, topological optimization of the anisotropic multi-material periodic steady-state heat transfer structure is carried out based on the meshless EFGM, and the structure is clear, simple and practical.

The present application provides a kind of determination method of blast furnace residual iron mouth opening position.The present application is based on blast furnace bottom brick lining structure, bottom brick lining heat transfer coefficient, temperature monitoring of thermocouple buried in bottom brick lining, one-dimensional steady heat transfer equation is applied and the calculation is carried out by assuming molten iron erosion depth, and compared with working thermocouple temperature, so that the remaining thickness of brick lining is calculated in the cycle process of assumption-calculation-contrast-reassumption.The present application is suitable for blast furnace with ≥3 layers of temperature measuring thermocouples buried in bottom brick lining of hearth, 1 layer of temperature measuring thermocouples buried in lower hearth base, each layer of thermocouples in bottom brick lining of hearth is uniformly distributed in circumferential direction, and the insertion depth of thermocouples in different layers of thermocouples is consistent in radial direction.The present application can more accurately calculate the erosion of molten iron to bottom brick lining and the opening position of blast furnace residual iron mouth.

The application discloses a kind of deep-buried tunnel lining structure and the analytical calculation method of radial temperature field along surrounding rock, including establishing the calculation model of annual temperature amplitude and annual average temperature along radial depth of tunnel lining structure and surrounding rock;Considering the influence of the difference of thermal physical properties of different material layers on the change of tunnel temperature field, the heat storage coefficient of different material layers and the surface heat storage coefficient are calculated;The annual temperature amplitude along radial depth distribution of tunnel lining structure and surrounding rock is calculated;Determine the temperature influence boundary of tunnel surrounding rock;The annual average temperature along radial depth distribution of tunnel lining structure and surrounding rock is calculated;The annual minimum temperature along radial depth distribution of tunnel lining structure and surrounding rock is calculated.The present application is based on the principle of superposition, the principle of periodic heat transfer and the principle of steady heat transfer, and a simple and easy-to-promote method for calculating the annual average temperature, annual temperature amplitude and corresponding annual minimum temperature along radial depth of tunnel lining structure and surrounding rock is proposed, which is used to guide the design of tunnel anti-freezing and heat preservation.