What is the ashrae standard for thermal comfort?
What is the ashrae standard for thermal comfort?
ASHRAE Technical FAQ Answer ASHRAE Standard 55-2017, Thermal Environmental Conditions for Human Occupancy, notes that for thermal comfort purposes, temperature could range from between approximately 67 and 82 °F.
What is the comfort zone on a psychrometric chart?
One of the major applications of the Psychrometric Chart is in air conditioning, and we find that most humans feel comfortable when the temperature is between 22°C and 27°C, and the relative humidity φ between 40% and 60%. This defines the “comfort zone” which is portrayed on the Psychrometric Chart as shown below.
What is the thermal comfort temperature?
The Health and Safety Executive (HSE) previously defined thermal comfort in the workplace, as: ‘… roughly between 13°C (56°F) and 30°C (86°F), with acceptable temperatures for more strenuous work activities concentrated towards the bottom end of the range, and more sedentary activities towards the higher end. ‘
What are the conditions assumed in the ashrae 55 standard for thermal comfort?
Local thermal discomfort To reduce draft risk at temperatures below 22.5 °C (72.5 °F), air speed due to the HVAC system must be 0.15 m/s (30 ft/min) or below. The vertical air temperature difference between ankle and head is limited to 3 °C (5.4 °F) for seated occupants and 4 °C (7.2 °F) for standing occupants.
How do you find saturation temperature on a psychrometric chart?
To read a psychometric chart, find the dry bulb temperature on the horizontal or X axis. Check the vertical or Y axis for the humidity ratio. The uppermost curved line on the chart shows the saturation curve when the relative humidity is 100 percent.
How thermal comfort is measured?
Thermal comfort is generally thought to be captured by measurements of four quantities: dry-bulb temperature, relative humidity, air speed, and radiant temperature.
What is the saturation temperature?
What is saturation temperature? The saturation temperature is just the official name for the boiling point. The term “saturation” comes from the fact that it is the temperature that a liquid has to be at to boil and enter the vapor phase, based on its saturation pressure.