Psychrometric Markup Board

Accurate chart geometry · reusable drafting markup

Tools

Line and Point are one-shot; placement returns to Select.

Markup

Selected object

TypeNoneColor—Geometry—Psych slope—

State readout

Dry bulb—Relative humidity—Humidity ratio— Dew point—Wet bulb—Enthalpy—Specific volume—

Process guides

Reusable line through the selected point, or chart center.

SHR = conventional approximate guide. Δh/ΔW = exact chart-coordinate slope.

Accuracy / coverage

ASHRAE example check: testing…

Families: DB, W, RH, saturation/dew point, thermodynamic WB, enthalpy, specific volume, enthalpy scale, SHR and Δh/ΔW.

Fog/two-phase extension above saturation intentionally omitted.

Chart options

Pressure

Labels

wet bulb

enthalpy

specific volume

saturation

markup

Select tool active

Select: drag empty space to pan · pinch to zoom · ? help