Visualizing predicted mean vote

The predicted mean vote (PMV) is an indicator of how persons in average may perceive a thermal environment as described by seven parameters: air temperature, radiant temperature, air velocity, relative humidity, clothing, metabolic rate (activity) and external work. Let us visualize the impact of these physical parameters on the predicted mean vote. One way to do this is to vary two parameters at a time - while keeping given default values for all other parameters - and look at corresponding contour plots of PMV.
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