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PSYCHOMETRIC CHART

Since humidity and temperature both affect comfort, they have been analysed simultaneously. The psychometric chart provides a graphic representation of the full state of the air under any condition within the current climate. It relates dry bulb temperature on the horizontal scale to absolute humidity on the vertical scale. If the temperature of a given volume of air is decreased to the point at which it can hold no more moisture, it becomes saturated. The corresponding temperature is called the dew point and is shown by the top
curved line. The range of temperature and humidity that most people consider comfortable is shown in the orange box.
The annual weather data plotted on the psychrometric chart (Figure 5), shows that relative humidity often rises above the comfortable level of 60% indicating that dehumidification maybe required to achieve comfort. It also indicates that the benefit of evaporative cooling will be limited.
A majority of the data points fall to the left of the comfort zone, indicating a need for heating. A number of points fall to the right of the comfort zone, indicating a need for cooling.
Enhanced natural ventilation and EXPOSED MASS with night-purge ventilation would be able to expand the comfort zone.