Thermal sensation analysis of underground engineering occupants based on field tests and questionnaires

Analyses the special factors affecting the thermal environment in underground engineering, and studies the main reasons for the occupants thermal sensation change. Elaborates a specific thermal sensation questionnaire and field tests for investigation on 32 underground engineering projects in different areas. Analyses the influence of the mean radiant temperature on the occupants thermal sensation change, and compares the actual mean thermal sensation (AMTS) values of occupants with the predicted mean vote (PMV) values. The results show that the occupants have the lower value of AMTS in the cooler side but exhibit higher warmth tolerance and adaptivity in warmer side. Carries out the regression analysis on the thermal neutral temperature and ground temperature in different regions, and develops the thermal neutral temperature models and thermal acceptable temperature ranges for underground engineering.