Example 02: Values from dry bulb temperature 'tdb' and wet bulb temperature 'twb' (sling psychrometer)

Gallery
Tutorial
TRAIL: Air Conditioning Psychrometrics (vs CED Engineering course): Example results (only) in Mathematica and SysML using the Webel Psy package and MPsy class
Section
Topic level
BASIC
Keywords
Slide kind
plot
table
Example problem from:
CED Engineering course PDF: 'Air Conditioning Psychrometrics (A.Bhatia)'
Example question:
A sling psychrometer gives a dry-bulb temperature of 78°F and a wet-bulb temperature of 65°F. Determine other moist air properties from this information.
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The answers (where available) from the worked example problem are given in the 3rd column in the custom table at the top of the image in IP units.

Below the custom table, the same values generated automatically by a Webel MPsy object (via the CoolProp wrapper for Mathematica) are shown, and then the state position on psychrometric charts in °F and °C.

Up next
Example 03a: Values from dry bulb temperature 'tdb' and wet bulb temperature 'twb'
Notes
[COMPLICATION, GOTCHA, TIP]{INFORMATIVE} GOTCHA: Mathematica: Specific enthalpy conversion J/kg to Btu/lb: Does not consider a possible "total" enthalpy reference offset vs 0 °C or 0 °F respectively
[CONVENTION]{STRICT} Webel: Psy/MPsy: Psychrometrics for Mathematica: For Imperial Units (IP), International British Thermal Units (Btu) are assumed
[ASSERTION, GOTCHA, WARNING]{INFORMATIVE} In the course PDF for 'CED Engineering: Air Conditioning Psychrometrics (A.Bhatia)' the term "enthalpy (h)" usually refers to the mass-specific enthalpy per dry air (in CoolProp notation 'Hda')
Snippets (quotes/extracts)
 A sling psychrometer gives a dry-bulb temperature of 78°F and a wet-bulb temperature of 65°F. Determine other moist air properties from this information.
Visit also
CED Engineering course PDF: 'Air Conditioning Psychrometrics (A.Bhatia)'
Visit also (backlinks)
Related slides (includes other tutorials)
Related slides (backlinks, includes other tutorials)