PMV（Predicted Mean Vote），预测平均评价，指数是以人体热平衡的基本方程式以及心理生理学主观热感觉的等级为出发点，考虑了人体热舒适感诸多有关因素的全面评价指标。PMV指数表明群体对于（+3~-3）七个等级热感觉投票的平均指数。(PMV (Predicted Mean Vote), forecasting average evaluation, index is based on the basic equation of human body heat balance and the level of subjective thermal sensation in psychophysiology, and considers the comprehensive evaluation index of many factors related to human thermal comfort. The PMV index shows the average index of the group's seven-level hot feeling vote for (+3~-3).)