Human Comfort Chart

The human body can be viewed as a heat engine where food is the input energy.

Human comfort chart. Thermal comfort is the condition of mind that expresses satisfaction with the thermal environment and is assessed by subjective evaluation ansi ashrae standard 55. Use the comfort zone chart correctly. Comfort zones are indicated on such a chart.

The comfort chart see figure 8 8 is an empirically determined effective temperature index that has been published by the ashrae since 1950. The purpose of the comfort chart is to indicate the percentage of people feeling comfortable at various effective temperatures in the winter and summer. Describe ways that the human body reacts while seeking its comfort zone.

Humans generally feel comfortable between temperatures of 22 c to 27 c and a relative humidity of 40 to 60. The tutorial briefly introducing the concept of human comfort zone on the psychrometric chart and sensible heat load factor lines. Understanding human comfort more than just temperature and humidity unfortunately many of us do not truly understand the complexities of.

Using the chart in figure 2 our example room would need an air temperature of around 80 f to provide an equivalent comfort range of 70 f. Relative and absolute michael boduch warren fincher for something so desirable comfort can unfortunately be a nebulous concept. The human body will release excess heat into the environment so the body can continue to operate.

In this application air at 35 c and 60 relative humidity will be conditioned into the human comfort zone with the thermodynamic process plotted on a psychrometric chart. Explain how air temperature mean radiant temperature humidity wind and sun affect human comfort.