import math


def cal_ppd(pmv):
    """
            This function is used to calculated Predicted Percentage of Dissatisfaction(PPD) through PMV
            PPD = 100 - 95 * exp(-(0.03353 * PMV^4 + 0.2179 * PMV^2))
    """
    return 100 - 95 * math.exp(-(0.03353 * pmv ** 4 + 0.2179 * pmv ** 2))