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https://www.nist.gov/el/net-zero-energy-residential-test-facility/thermal-comfort-studies

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# Thermal Comfort Studies

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To assess the impact of different heating, cooling, and ventilating equipment on thermal comfort, the research      

To observe how the temperatures vary throughout the day and when different equipment is being used, contour plots are developed at different times and at different heights in the room as demonstrated below in Figure 2.  Additionally, plots of various quantities, such as the Predicted Percentage of Dissatisfied (PPD) occupants, are made over the course of each day.  

Figure 3 shows the PPD for 2 different clothing levels and two different activity levels for three locations in the room. For this winter day, it would be expected that occupants would be wearing a higher level of clothing (i.e., a higher “clo” value), with the corresponding PPD being shown in the bottom three curves.   This plot shows that the measured conditions in the room are predicted to be perceived as uncomfortable by approximately 5 % of the population throughout the day, a value that is considered good for thermal comfort assessment.  

The team continues to assess how different equipment impacts thermal comfort and will soon publish the results of the study. 

EnergyEnergy efficiency

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                -  William M. Healy  william.healy@nist.gov      (301) 975-4922   

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