A Ventilation Algorithm for Underground Space

Abstract

The invention discloses an underground space ventilation volume calculating method. The underground space ventilation volume calculating method is specialized for a dehumidification-centric ventilation air-conditioning system in an underground space. The underground space ventilation volume calculating method aims at meeting the requirements on IAQ (indoor air quality) of the underground space, starts with establishment of a power management and control system, utilizes the good building thermal performance of the wall geologic bodies of the underground space, embodies the nonlinear strong-coupling functional relationship among various state parameters of humid air, embodies different ventilation volume calculating models in a stable state as well as an instable state during usage and maintenance of the underground space, achieves simplified calculation of the complex actual humidity of the underground space through mathematical models established via dynamic equilibrium analysis, guarantees that the ventilation volume can meet the requirements of eliminating pollutants, waste heat and excessive humidity in the underground space as well as greatly reduce the energy source requirements of a system on winter heating and summer cooling, enables the indoor parameter control of the underground space to meet the design requirements and meanwhile facilitates development of earth energy resources of the superficial layers of the wall geologic bodies.

Description

technical field [0001] The invention relates to an underground space ventilation volume algorithm, in particular to a ventilation volume control calculation method for a dehumidification-based ventilation and air-conditioning system in an underground space, and belongs to the technical field of building energy conservation. Background technique [0002] Cities are the symbol of human civilization, but with the rapid growth of population, a series of "anti-urbanization" phenomena such as land shortage, traffic congestion, poor environment and insufficient human living space have appeared in cities, which has triggered another kind of urban three-dimensional development. The form, that is, the underground space, makes it an ideal place for increasing urban land use, alleviating high urban density, improving land use efficiency, saving land resources, unblocking traffic, three-dimensional diversion of people and vehicles, expanding infrastructure capacity, protecting urban histo...

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Problems solved by technology

[0003] At the same time, with the continuous transformation of the modern urban development model, the city has entered a new stage of multi-level and three-dimensional development, the urban space has become more diversified, and the development and use of underground space is greater. While developing new power, we will inevitably face a new problem, that is, the energy consumption of underground space, especially the energy consumption of equipment caused by the design and calculation of the ventilation volume of the ventilation and air conditioning system.

[0004] The current calculation method of underground space ventilation is more aimed at SO 2 gas, CO 2 Gas, CO gas, smog and other pollutants and waste heat are taken as the control objects, and the vertical and horizontal transmission and diffusion of pollutants and waste heat into the atmosphere are taken as the characterization of the dilution capacity of the ventilation system, focusing on the elimination of waste heat and the concentration of pollutants. However, the temperature in the underground space is relatively low and the relative humidity rises significantly. When the wall surface temperature is lower than the dew point temperature corresponding to the air moisture content, condensation water will cause the underground space to be humid; at the same time, the current various These calculation methods are mainly based on the moisture content difference and enthalpy difference of the supply and exhaust air to calculate the ventilation rate of the underground space. On the one hand, it does not fully reflect the dynamic balance of the moisture content in the underground space, and on the other hand, it does not fully reflect the various state parameters of the humid air. On the other hand, it does not fully reflect the calculation models of different ventilation volumes in the stable state and the unsteady state during the use and maintenance of underground space; in addition, various calculation methods at present need to check the map or calculate the relevant Calculation parameters such as moisture content and enthalpy value, on the one hand, there are large errors in the checked or calculated values, on the other hand, the detailed calculation process steps are cumbersome and complicated, and the probability of errors is also high

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