HVAC Systems & Psychometrics Exam
Questions & Answers8
psychometry investigates... - ANSWERS-different properties of air
methods to control temp and humidity
combined effect on thermal comfort of building users and building envelope
units - relative humidity - ANSWERS-%
units - HR - ANSWERS-lb. moisture/lb. dry air
kg moisture/kg dry air
units - specific volume - ANSWERS-ft^3/lb. dry air
m^3/kg dry air
units - enthalpy - ANSWERS-BTU/lb, kJ/kg
units - dry/wet bulb temp - ANSWERS-degrees farenheit
Dry Bulb Temperature - ANSWERS-air temperature, bottom horizontal axis
humidity ratio - ANSWERS-dry-basis moisture content of air; weight of water vapor per unit
weight of dry air; inner vertical axis
, saturation curve - ANSWERS-the curved part on the left
relative humidity - ANSWERS-%; Pv/Pvs; Pv = actual water vapor pressure; Pvs = vapor pressure
of satured air at the same temp; capacity to hold moisture increases as air temp is higher
dew point temperature - ANSWERS-temperature at which water vapor starts to condense out of
air that is cooling; vertical left middle axis on the right of chart
enthalpy - ANSWERS-amount of heat in moist air; BTU/lb of air, KJ/Kg of air; bottom//diagonals
on the left//right most column measured diagonally
wet bulb temperature - ANSWERS-represents how much moisture the air can evaporate;
diagonal lines (like relative humidity)
specific volume - ANSWERS-the space occupied by air; total volume of humid air per mass unit
of dry air
HVAC design process 1 - ANSWERS-establish project requirement
HVAC design 2 - ANSWERS-calculate heating/cooling & ventilation loads
HVAC design 3 - ANSWERS-preliminary system selection & zoning
HVAC design 4 - ANSWERS-select and size HVAC components
HVAC design 5 - ANSWERS-develop control logic/strategies
Questions & Answers8
psychometry investigates... - ANSWERS-different properties of air
methods to control temp and humidity
combined effect on thermal comfort of building users and building envelope
units - relative humidity - ANSWERS-%
units - HR - ANSWERS-lb. moisture/lb. dry air
kg moisture/kg dry air
units - specific volume - ANSWERS-ft^3/lb. dry air
m^3/kg dry air
units - enthalpy - ANSWERS-BTU/lb, kJ/kg
units - dry/wet bulb temp - ANSWERS-degrees farenheit
Dry Bulb Temperature - ANSWERS-air temperature, bottom horizontal axis
humidity ratio - ANSWERS-dry-basis moisture content of air; weight of water vapor per unit
weight of dry air; inner vertical axis
, saturation curve - ANSWERS-the curved part on the left
relative humidity - ANSWERS-%; Pv/Pvs; Pv = actual water vapor pressure; Pvs = vapor pressure
of satured air at the same temp; capacity to hold moisture increases as air temp is higher
dew point temperature - ANSWERS-temperature at which water vapor starts to condense out of
air that is cooling; vertical left middle axis on the right of chart
enthalpy - ANSWERS-amount of heat in moist air; BTU/lb of air, KJ/Kg of air; bottom//diagonals
on the left//right most column measured diagonally
wet bulb temperature - ANSWERS-represents how much moisture the air can evaporate;
diagonal lines (like relative humidity)
specific volume - ANSWERS-the space occupied by air; total volume of humid air per mass unit
of dry air
HVAC design process 1 - ANSWERS-establish project requirement
HVAC design 2 - ANSWERS-calculate heating/cooling & ventilation loads
HVAC design 3 - ANSWERS-preliminary system selection & zoning
HVAC design 4 - ANSWERS-select and size HVAC components
HVAC design 5 - ANSWERS-develop control logic/strategies
