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Midterm HVAC Design

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Comfort involves four things:   1) temperature 2)humidity 3) air 4)air cleanliness  
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The body gives off and absorbs heat by four methods of heat transfer   1)conduction 2)convection 3)radiation 4)Evaporation of perspiration  
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1)Guideline for Comfort: Winter   1)temperature can be offset with higher humidity 2)the lower the humidity is, the higher the temperature must be 3)Air movement is more noticeable  
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2)Guideline for Comfort: Summer   1)When the humidity is high, air movement helps. 2)Higher temperatures can be offset with lower humidity  
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3)Guideline for Comfort   The comfort conditions in winter and in summer are different  
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4)Guideline for comfort   Styles of clothers in different parts of the country make a slight difference in the conditional space temperature requirement for comfort.  
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Psychrometric charts   1)Dry-bulb temperature 2)wet-bulb temperature 3)Relative humidity 4)Specific Volume 5)Moisture content 6)Heat content  
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psychrometrics   the study of air and its properties  
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