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ENGR 101 chapter 2

Factors can be aected by building design metabolism

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Unformatted text preview: lood through the skin decreases •  Skin temperature falls to help deep body temperature remain constant •  Metabolism increases by shivering 7 9/2/13 some physiological consideraHons As air temperature increases: •  Flow of blood through the skin increases •  Skin temperature rises to help deep body temperature remain constant •  SweaHng occurs to create evaporaHve cooling heat exchange equaHon convec&on 8 9/2/13 what factors can be affected by building design? •  •  •  •  Metabolism? EvaporaHon? ConvecHon? RadiaHon? design choices affect heat transfer 9 9/2/13 what people noHce what people noHce 10 9/2/13 the comfort zone X 78°F Guidelines* *Federal Energy Management Program's (FEMP'S) OperaHons and Maintenance Best PracHces Guide, August 2010 the comfort zone ASHRAE = American Society of HeaHng, RefrigeraHng, and Air CondiHoning Engineers 11 9/2/13 the comfort zone The preferred temperature that will saHsfy approximately 80% of normally clad, sedentary adults = 72°F zone of thermal neutrality Condi5on in which the body is not required to take any par5cular ac5on to maintain its heat balance. Normally clothed 70°F to 75°F Lightly clothed 80°F to 85°F No clothing 81°F to 86°F 12 9/2/13 individual differences individual differences 13 9/2/13 poll On your phone: Text code to: 37607 On the web: Submit code to hjp://PollEv.com Take the poll stress and strain 14 9/2/13 Stress stress and strain Strain comfort is the only useful measure of lower levels...
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