Lecture_3a_-_Environmental_Requirements_of_Occupants_Compatibility_Mode_

Lecture_3a_-_Environmental_Requirements_of_Occupants_Compatibility_Mode_

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10/18/2008 1 Environmental Requirements of Thermal Comfort, Ventilation, and Li hti C diti Occupants Lighting Conditions. 1 Thermal Comfor 1- Thermal Comfort
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10/18/2008 2 Are You Comfortable? Thermal Comfort factors Thermal Comfort Factors
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10/18/2008 3 Comfort Comfort y Thermal comfort is achieved when there is a balance between the generation of metabolic heat within the body and the loss of heat from the body via the mechanisms of conduction, convection, radiation and evaporation.
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10/18/2008 4 Heat flux from human Human and Climate
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10/18/2008 5 Psychometric Chart Psychometric Chart Processes heating and Cooling
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10/18/2008 6 Comfort Zone Depends on Climate
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10/18/2008 7 Comfort shifts with MRT and Air Movement Fanger Thermal Comfort Model ¾ This model depend on six main parameters: 1. Metabolic rate 2. Clothing thermal resistance 3. Air temperature 4. Mean radiant temperature 5. Air velocity 6. Relative humidity Thermal comfort can be measured by the operative temperature T o which should be maintained at about 23ºC o T ca r hT hM R T ×+× = cr hh + 44 4 4 1122 .................. p pn p n MRT TF TF −− =++ + MRT : Mean radiant temperature.
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10/18/2008 8 15 16
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10/18/2008 9 17 Calculation of Mean Radiant Temperature y Equation for calculating the Mean Radiant Temperature from the Air-and Globe Temperature: y For a glob thermometer y For operative transducer
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10/18/2008 10 Mean Radiant Temperature estimated from a measured value of Plane Radiant Temperature y The Mean Radiant Temperature can be calculated with a good degree of accuracy from six measured values of the Plane degree of accuracy from six measured values of the Plane Radiant Temperature. y For a sitting person the equation is: y For a Standing Person Calculation of Plane Radiant and Operative Temperature ti is surface temperature of surface no. i [ ° C] F pl-i is angle factor between a small plane and surface
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10/18/2008 11 Calculation of Operative Temperature The Comfort Equations y The equation for comfortable skin temperature and sweat production can be combined with the equation for the body’ s energy balance to derive the Comfort Equation. y This equation describes the connection between the measurable physical parameters and thermally neutral sensation as experienced by the "average" person.
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Lecture_3a_-_Environmental_Requirements_of_Occupants_Compatibility_Mode_

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