Discussion Overview
The discussion revolves around the availability of charts and data relating air temperature and pressure, particularly in the context of using air as a refrigerant. Participants explore whether ideal gas equations are applicable in practice and seek alternatives such as data books and compressibility factors.
Discussion Character
- Exploratory
- Technical explanation
- Debate/contested
Main Points Raised
- One participant inquires about the existence of charts similar to steam tables for relating air temperatures and pressures, questioning the practical applicability of the ideal gas equation (PV=nRT).
- Another participant asks if charts are available for pressure and temperature when air is used as a refrigerant, or if they should rely solely on gas laws.
- A participant mentions using the perfect gas law with a compressibility factor derived from Van der Waals' equations as their standard approach.
- One participant notes that in industry, computer databases for fluid properties are commonly used, highlighting NIST REFPROP as a widely utilized resource for those without proprietary databases.
Areas of Agreement / Disagreement
Participants express varying opinions on the use of ideal gas laws versus empirical data, indicating that multiple competing views remain regarding the best approach to relate air temperature and pressure.
Contextual Notes
Some limitations include the dependence on specific conditions for the ideal gas law's applicability and the potential need for additional data sources or corrections when using compressibility factors.