BS: Lesson 4 - Comfort, Climate and Solar Design Flashcards
What are the 5 factors that affect human comfort?
culture
recent exposure
health
age
metabolism
In what direction does heat flow.
From hot to cold
In regards to human comfort, what happens when the environment’s temperature reaches 98.6 degrees?
All heat loss from conduction, convection and radiation stops
What happens when the environment’s temperature rises higher than 98.6 degrees?
The body direction of heat flow reverses and the body tries to remain at 98.6 degrees.
What is Enthalpy?
The sum of sensible and latent heat.
What is a Psychrometric Chart?
A chart used to show the relationship between the environment’s temperature and humidity and its EFFECT on human comfort.
A constant amount of water in the air DOES or DOES NOT represents a constant relative humidity (RH)
Does not.
On a Psychrometric Chart, the curved lines represent what?
Relative humidity.
On a Psychrometric Chart, the vertical lines represent what?
Dry-bulb temperature (air temperature)
On a Psychrometric Chart, the horizontal lines represent what?
The amount of water contained by the air (i.e. grains of moisture per pound of dry air)
On a Psychrometric Chart, the diagonal lines running right to left represent what?
Wet-bulb temperature.
What is relative humidity?
The percentage of how much water is in the air at a give temperature compared to how much the air could hold at that temperature.
When relative humidity increases, temperature will________ ?
decrease
Which can hold more water? Cold or Warm air?
Warm air
True or False.
Temperature and relative humidity are interrelated?
True
In general, the comfort zone for most people doing calm or sedentary work, lightly clothed, would be_____?
65 - 78 degress
Mean Radiant Temperature (MRT)
The weighted average of all of the temperatures of all of the surfaces visible from a given position.
Regarding the Psychrometric Chart, the comfort zone is effected by what 4 climate charatcteristics?
temperature
relative humidity
mean radiant temperature
air velocity
In regards to Solar Design for climate and comfort, building design must respond to what two environmental factor?
sun
climate
In the winter there is a great amount of sun on which facade of a building?
south facing facade
In the summer there is a great deal of sun on which building facade?
east
west
roof
horizontal skylights
The southern sun exposures for building facades should be minimized or maximized?
maximized
What facades and/or portions of a building should be minimized to reduce the summer sun exposure?
eastern
western
horizontal skylights
In cold climates, a sawtooth clerestory should face which direction, north or south?
south