d deck Flashcards
occurs when body temperatures are held within narrow ranges, skin moisture is low and the body effort at temperature regulation is minimized
THERMAL COMFORT
Four environmental conditions
- AIR TEMPERATURE
- RELATIVE HUMIDITY
- AIR MOVEMENT
- MEAN RADIANT TEMPERATURE
- determines the rate at which heat is lost in the air
- usually measured in degrees celcius, of the air surrounding the body (thermometer)
AIR TEMPERATURE
refers to the moisture content (water vapor) of the atmosphere
RELATIVE HUMIDITY
affects the heat loss rate by both convection and evaporation
AIR MOVEMENT
when MRT differs greatly from the air temperature, its effects must be considered
MEAN RADIANT TEMPERATURE
a diverse organization dedicated to advancing the arts and sciences to heating, ventilation, air conditioning and refrigiration
ASHRAE (American Society of Heating, Refrigerating and Air-conditioning Engineers)
six basic factors of thermal comfort
ENVIRONMENTAL FACTORS:
- HUMIDITY
- AIR TEMPERATURE
- RADIANT TEMPERATURE
- AIR VELOCITY
PERSONAL FACTORS:
- CLOTHING INSULATION
- METABOLIC HEAT
if a work environment has high humidity it means there is a lot of water in the air
HUMIDITY
warmth that radiates from warm objects such as the sun etc.
RADIANT TEMPERATURE
the speed at which air is moving over and individual
AIR VELOCITY
thermal insulation provided by clothing
CLOTING INSULATION
the heat released from muscle metabolism
METABOLIC HEAT
is a coating/thin layer of a material that has very low thermal conductivity
THERMAL BARRIERS
a feautre that allows the conditioning system to switch temporarily between heating and cooling
ADAPTIVE COMFORT
