BAS
List the three (3) primary functions of an HVAC system
Heating, Ventilating, Air Conditioning (Cooling)
The process in which the moisture or water vapor or the humidity is removed from the air?
De-humidification
3 types of Heat Transfer
Convection
Conduction
Radiation
____ data points sends electrical signals from the field device to operate mechanical equipment such as fans, pumps
Binary outputs
Change in state w/ out a change in temperature
Latent Heat
What is determined through the measuring of the carbon dioxide level(CO2) in parts per million within a building?
Air Quality
The temperature at which moist air becomes saturated (1 00%relative humidity) with water vapor when cooled at constant pressure.
Dew point
Second Law of Thermodynamics
Heat travels from hot to cold
____ data points report the current state of mechanical equipment such as fans and pumps?
Binary Inputs
A graphical representation of the thermodynamic properties of air.
Psychrometric Chart
____ data points report building conditions such as temps, humidity, pressures, to the field device.
Analog Inputs
The temperature obtained using an ordinary thermometer.
Dry Bulb temperature
Definition of radiation?
is the emission of electromagnetic radiation.
The #1 rule of thumb in BAS?
All operations begin and end with the field device
The ratio of water vapor in the air as compared to the maximum amount of water vapor that may be contained. It is expressed as a percentage.
Relative Humidity
The #2 rule of thumb in BAS?
Programming and mechanical equipment must match identically for efficient operation
The total heat content of the air (sum of the sensible heat and latent heat). It is also referred to as total heat. It is expressed in British thermal units (Btu) per pound of air.
Enthalpy
Definition of convection?
is heat transfer via the movement of a fluid, such as air or water. Heating water on a stove is a good example. is heat transfer via the movement of a fluid, such as air or water. Heating water on a stove is a good example.
____ data points use electrical signals to command end devices such as actuators to specified positions
Analog outputs
The temperature that is measured with a thermometer that has a wet cloth wick around the thermometer bulb. It is expressed in degrees Fahrenheit.
Wet Bulb temperature
What is the point type used to modulate a damper
AO Analog output
Change in temperature without a change in state
Sensible heat
Definition of conduction heat transfer?
is heat transfer directly between neighboring atoms or molecules. Usually, it is heat transfer through a solid. For example, the metal handle of a pan on a stove becomes hot due to convection.
What happens when there is positive building pressure present?
The doors of a building open by themselves
How are temperature measurements converted between Fahrenheit and Celsius?
C= deg F-32 / 1.8
F= 1.8 x deg C +32