Compute the thermal comfort indices PMV (Predicted Mean Vote, −3 cold..+3 hot) and PPD (Predicted Percentage Dissatisfied, %) per ISO 7730 / ASHRAE 55, using the Fanger equations. Inputs: air temperature Ta, mean radiant temperature Tr, relative air velocity v_ar, relative humidity φ, metabolic rate M (met; 1 met = 58.2 W/m²), clothing insulation Icl (clo; 1 clo = 0.155 m²·K/W), and external work W (defaults to 0). The clothing surface temperature Tcl is solved iteratively. Returns a 7-level ASHRAE sensation label.
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Key facts
Category
Math & Numbers
Input types
number, select
Output type
json
Sample coverage
4
API ready
Yes
Overview
Thermal Comfort PMV-PPD calculates Predicted Mean Vote (PMV) and Predicted Percentage Dissatisfied (PPD) using the Fanger equations from ISO 7730 and ASHRAE 55. Enter air temperature, mean radiant temperature, air velocity, humidity, metabolic rate, and clothing insulation to receive a thermal sensation label and supporting results.
When to use
Estimate perceived thermal comfort in offices, classrooms, and other occupied spaces.
Compare comfort conditions for different temperatures, humidity levels, clothing, or activity rates.
Review PMV and PPD values during HVAC, building, or indoor-environment assessments.
How it works
1Enter air temperature Ta and mean radiant temperature Tr, choosing Celsius or Fahrenheit.
2Provide relative air velocity, relative humidity, metabolic rate in met, and clothing insulation in clo.
3Optionally enter external work; it defaults to 0 met for sedentary activities.
4The tool solves clothing surface temperature iteratively and returns PMV, PPD, and a seven-level thermal sensation label.
Use cases
Evaluate office comfort using indoor temperature, radiant temperature, humidity, activity, and clothing assumptions.
Compare summer and winter clothing scenarios with different clo and met values.
Communicate comfort results with PMV, PPD, and a clear sensation label.
Examples
1. Office winter comfort assessment
Building engineer
Background
A building engineer is reviewing a winter office condition with equal air and mean radiant temperatures, moderate humidity, seated office activity, and business clothing.
Problem
Estimate whether occupants are likely to feel neutral and determine the predicted dissatisfied percentage.
How to use
Enter Ta=22 °C, Tr=22 °C, relative air velocity=0.1 m/s, RH=50%, met=1.2, clo=1.0, and external work=0.