Unit 35A
What temperature and humid are most humans comfortable in?
What is 75° F and 50% Humidity
Providing a comfortable atmosphere for people is whose job?
What is a Heating and Air Conditioning profession.
What is wet-bulb temperature?
Wet-bulb temperature(WBT) is the temperature read by a thermometer covered in water-soaked (water at ambient temperature) cloth over which air is passed. At 100% relative humidity, the wet-bulb temperature is equal to the air temperature (dry-bulb temperature); at lower humidity the wet-bulb temperature is lower than dry-bulb temperature because of evaporative cooling.
What is the function of the R Terminal in a thermostat?
24V
Why does human skin turn red when we get too warm?
What is vessels next to the skin dilate to get blood closer to the air to heat exchange with the air.
Why might one person be comfortable in the same room while another is not?
What is the bodies metabolism varies from person to person.
Define Pschrometrics.
The study of air and it's properties.
AKA The study of moisture in the air.
The W Terminal in a thermostat controls what in a Furnace or Air Handler?
Heat
The human body uses what to produce energy?
What is food?
If the body is in 73° air it will...
What is reject heat to it's surroundings
The average core body temperature is ...
What is 98.6° F
The G terminal in a thermostat controls what component?
Indoor Fan Motor(IFM)
If the human body is in 100° F air it will ...
What is absorb Heat
The Second Law of Thermodynamics states that ...
What is heat moves from hotter objects to colder objects.
If the human body cannot cool itself by dilating vessels in the skin, what will it do next in an attempt to cool itself?
What is Perspire(Sweat)
The C terminal in a thermostat represents what?
Common and is a return path for the 24V transformer.
What is Dry-Bulb Temperature?
Dry-bulb temperature(DBT) is the temperature of air measured by a thermometer freely exposed to the air, but shielded from radiation. DBT is the temperature that is usually thought of as air temperature, and it is the true thermodynamic temperature.
Explain the relationship between body temperature and room temperature.
What is the average core body temperature is 98.6° F, if the room is cooler heat will flow from the body to the surroundins. If the room is over 98.6° F the body will begin to absorb heat.
What are the four factors that affect comfort?
What is Temperature, Humidity, Air Movement, and Air Cleanliness
The Y terminal on a Thermostat controls what 3 components in a residential split system?
Indoor Fan Motor(IFM) in a furnace or air handler and the Compressor(COMP) and Outdoor Fan Motor(OFM) in the outside condenser.