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Thermal Comfort Calculator

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Input Parameters

Unit System

Imperial (°F, BTU, ft)SI (°C, kW, m)

Air Temperature (°F)

Mean Radiant Temperature (°F)

Air Velocity (FPM)

Relative Humidity (%)

Clothing Level (clo)

Activity Level (met)

Results

Thermal Comfort

-0

PMV

5

PPD %

Comfortable

Comfort Rating

Comfort Breakdown

PMV-0.0616 (2%)

PPD5.08 %(5%)

Comfort Analysis

Calculation Steps

1

Convert to Consistent Units

Formula:

T_{°C} = (T_{°F} - 32) \times 5/9\newline v_{m/s} = v_{FPM} \times 0.00508

Calculation:

T_a = (75 - 32) \times 5/9 = 23.89 °C\newline T_r = (75 - 32) \times 5/9 = 23.89 °C\newline v = 30 \times 0.00508 = 0.152 m/s

Result:

\text{ }

2

Calculate PMV (Simplified)

Formula:

PMV = f(T_a, T_r, v, RH, clo, met)

Calculation:

PMV ≈ 0.318 \times (23.89 - 24) + 0.1 \times (50 - 50)/100 - 0.05 \times (0.152 - 0.1) \times 10 - 0.1 \times (0.5 - 0.5) \times 2

Result:

-0.06 \text{ }

3

Calculate PPD

Formula:

PPD = 100 - 95 \exp(-0.03353 PMV^4 - 0.2179 PMV^2)

Calculation:

PPD = 100 - 95 \exp(-0.03353 \times -0.06^4 - 0.2179 \times -0.06^2)

Result:

5.1 \text{ %}