File: Psychrometric chart and Humidair program Dec 14 2023.docx
Why our study uses the psychrometric model of the Earth’s atmosphere Douglas Lightfoot and Gerald Ratzer December 14, 2023 1. Using the psychrometric model The psychrometric mathematical model of the Earth's atmosphere accurately separates the warming effects of carbon dioxide (CO 2) and water vapor. The methodology uses empirical data to show that the warming effects of CO2 and water vapor are significantly different. Both carbon dioxide and water vapor warm the Earth's atmosphere. They do so in different amounts and by other relationships to their concentration, i.e., the number of molecules per cubic meter. Empirical data collected in sets of 20 within the same hour at random times for twelve months is input to obtain a data set of 240 values to determine accurate relationships. For example, Figure 1 shows the relationship between dry air's enthalpy and temperature. CO2 is part of the dry air that includes all of the gases in the atmosphere except water vapor, i.e., nitrogen, oxygen, argon, carbon dioxide, neon, helium, methane, krypton, and trace species. The enthalpy for all these gases is linear with temperature, as in Figure 1 from a data set of 240 points.
Figure 1. Enthalpy of CO2 versus temperature 1 ©Lightfoot and Ratzer 2023