Ventilator tidal volume formula: 1, tidal volume = tidal water column height × 6. 1m3 water column has the tidal volume; 2. empirical formula: 50 × 103mm3/m3 = 10cm3 water column has the tidal volume.
1. Tidal volume = height of tidal water column x 6. Tidal volume of 1m3 water column.
2, empirical formula: 50 × 103mm3/m3 = 10cm3 water column has the amount of moisture.
3, the international standard: conversion relationship: an atmospheric pressure, in the 1m water column height of water, will be every square centimeter of water vapor in the air when heated to saturation of the heat required, called the saturation of this water column of water vapor pressure. At this point there is about 0. 785kJ/cm2 x 1000cm2 = 1. 035kJ/cm2 x (2m x 10~3/m3) per cubic centimeter of water.
4, porous media in the unit of time evaporation of water fraction (expressed by the symbol Q) is called evaporation, that is, the rate of evaporation of water per unit of time. Its unit is related to the water temperature and humidity, generally in millimeters of water column per minute.
5, humid air contains a large amount of water vapor. The mass fraction of water vapor in it is generally between 80% and 94%, depending on the temperature, humidity, pressure, airflow direction and environment.
6, definition: when the wet air is saturated with water vapor, it is said that the wet air has reached a state of water vapor saturation.
7, the water vapor pressure of saturated air = 0. 1N/m2, the formula is: W saturation = 0. 1N. / m? As the higher the air temperature, the lower the humidity, the higher the pressure, then the wet air reaches water vapor saturation when the water vapor pressure is lower.
8, the relative humidity of humid air refers to the absolute humidity of the air and the ratio of the absolute humidity of saturated air at the same temperature. That is, the ratio of the relative humidity of saturated air to the relative humidity of unsaturated air.
9, the air reaches or close to saturation temperature, known as the temperature of the saturation temperature. Expressed in symbols S, the unit is K. 10, the actual measured results do not meet the saturation temperature, should be corrected according to the following formula: where E is the corrected value, subtract the corrected value with the measured value, and then subtract 50 ℃.