What are the thermal comfort indices?
Thermal comfort indices describe how the human body experiences atmospheric conditions, specifically air temperature, humidity, wind and radiation. Definition The universal thermal climate index (UTCI) is an equivalent temperature (°C), it is a measure of the human physiological response to the thermal environment.
What is thermal condition?
Thermal conditioning is the controlled application of heating and cooling to achieve a change in the mechanical properties of a material.
What is the thermal human comfort temperature?
Humans generally feel comfortable between temperatures of 22 °C to 27 °C and a relative humidity of 40% to 60%.
What is meant by thermal comfort?
The term ‘thermal comfort’ describes a person’s state of mind in terms of whether they feel too hot or too cold.
What factors influence thermal comfort?
Environmental factors
- Air temperature. This is the temperature of the air surrounding the body.
- Radiant temperature. Thermal radiation is the heat that radiates from a warm object.
- Air velocity.
- Humidity.
- Clothing insulation.
- Work rate/metabolic heat.
Why thermal comfort is important for building user?
Building Thermal Comfort Why is Thermal Comfort in Buildings Important? It’s simple: feeling comfortable in an interior space directly impacts people’s mood. Eliminating potential health hazards is also a very important aspect of maintaining ideal thermal comfort.
How many BTU’s does a person give off?
Morpheus says that the human body generates 25,000 BTUs, which as a unit of power is approximately 10 horsepower or about 7.3 kilowatts. In reality, the human body produces between 250 and 400 BTUs of power, depending on its state of consciousness. In other words, when the body is asleep, it produces less.
What causes thermal discomfort?
The heat transfer is proportional to temperature difference. The main factors that influence thermal comfort are those that determine heat gain and loss, namely metabolic rate, clothing insulation, air temperature, mean radiant temperature, air speed and relative humidity.
What are sensible heat gains?
Sensible Heat Gain – is the energy added to the space by conduction, convection and/or radiation. Space Heat Extraction Rate – the rate at which heat is removed from the conditioned space and is equal to the space cooling load if the room temperature remains constant.
What are the four comfort factors?
The 4 Factors of Comfort
- Temperature. How hot or cold is it? Humans like to be in the range of 70 to 80 degrees, more or less. This is the most obvious of the 4 factors of comfort and gets the most attention.
- Humidity. How much moisture is in the air? Forty to sixty percent relative humidity is the ideal range.
How do you control thermal comfort?
Control the environment
- replace hot air with cold, or replace cold air with hot, as required.
- humidify or dehumidify the air as required.
- increase air movement by ventilation or air conditioning.