12_Thermal%20Comfort_GB_2007-slides

12_Thermal%20Comfort_GB_2007-slides - Thermal Comfort Arch...

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Unformatted text preview: Thermal Comfort Arch 140, Lecture #12 Thursday, February 22, 2007 ASHRAE*definition: “…that condition of mind which expresses satisfaction with the thermal environment” But thermal dis comfort is easier to define and measure, as a result …. Engineer’s view: Comfort = absence of discomfort = “neutrality” What is Thermal Comfort? * American Society of Heating, Refrigerating, and Air-Conditioning Engineers Experiential goals – Thermal neutrality or Thermal delight ?? Thermal comfort & architectural elements Thermal comfort & the workplace Over the life of a building, occupancy costs substantially exceed both energy and financing costs Energy Finance Occupants (salaries) $/ft 2-year 200 - 150 - 100 - 50 - 0 - ~ 2 $/ft 2-yr ~ 20 $/ft 2-yr ~ 200 $/ft 2-yr Comfort & the Body’s Heat Balance Heat Gains & Losses 37 °C = 98.6 ˚F Influences our body’s thermoregulatory system 1. Blood flow - vasoconstriction- vasodilation 2. Sweating 3. Shivering 4. Goosebumps Physiological Control Mechanisms - Involuntary Environmental Personal- Turning on/off fan- Changing clothing- Turning on/off heater - Changing activity- Opening/closing:- Changing posture, > windows position or location > blinds & shades- Eating/drinking something cold or hot Behavioral Control Mechanisms - Voluntary Measurable factors that influence the body’s heat balance Environmental Personal 1. Air temperature 1. Activity 2. Humidity 2. Clothing 3. Air velocity 4. Mean radiant temperature Major Variables Influencing Thermal Comfort Air Temperature...
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12_Thermal%20Comfort_GB_2007-slides - Thermal Comfort Arch...

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