Calculate or simulate thermal comfort using guideline performance criteria and other appropriate thermal comfort indices. Operative Temperature is determined by DBT, relative humidity, and mean radiant temperature (DBT, RH, MRT), and air velocity. Calculation can also include the effects of Clo value (the insulation value of clothing), physical activity, and time. See especially the most recent version of ASHRAE Standard 55 and the Human Factors and Ergonomics Design Handbook for explanation of conditions and measures to provide for thermal comfort. See other references, particularly Engineering Data Compendium and NASA MSIS for handling special condition problems. See Handbook of Environmental Psychology for discussion of thermal issues for particular settings (e.g., offices, industrial environments) and for perceived control of thermal variables.
Implementation in the Design Process:
During Predesign, determine special thermal comfort requirements or problems that may be encountered in the building due to work activities or siting or design considerations.
Review conditions that affect thermal comfort using the most recent version of ASHRAE Standard 55 or Human Factors and Ergonomics Design Handbook. Perform any baseline studies on thermal problems or issues that may exist in current facilities if the project involves a move or remodel.
During Design, estimate thermal comfort performance measures using ASHRAE Standard 62 occupancy limits for spaces and comfort zone and other thermal conditions in ASHRAE Standard 55. Ensure that no major design characteristic of the building required by these guidelines will push these variables outside general comfort ranges as defined by the guidelines.
As the Design phase progresses, consider additional calculations of thermal comfort indices as appropriate to specific project conditions. Additional measures may include operative temperature, new effective temperature (which combines air temperature and relative humidity,) or Wet Bulb Globe Temperature (which combines dry bulb, wet bulb, and globe temperature measures.) The latter is the effective index under potential heat stress conditions.
During construction administration, verify the project is achieving thermal comfort as designed and required by this guideline.