1.9 KiB
Definitions
CFM50
Is a unit of measurement that is taken when a blower door test is performed on the home. Stands for $C$ubic $F$eet per $M$inute at 50 pascals.
IAQ
Stands for $I$ndoor $A$ir $Q$uality. We spend most of our time indoors, so having good indoor air quality can help reduce illness and potentially improve the quality and longevity of life.
LAIR
Stands for $L$eakage $A$ir $I$nfiltration $R$ate, which is a metric that compares the square footage of the home and it's blower door number. This aids in determining if a home is controllable by properly sized HVAC equipment or if [shell] improvements (air sealing and insulation) should be considered.
Load Caclulation
A load calculation, also called a Manual-J, calculates the heating and cooling requirements for a home. Each home has a unique heating and cooling load based on the direction it faces, the air leakage, the location, the insulation values, the types and sizes of windows, among other factors.
Shell
Shell is a term used to describe the enclosure of the house. It is often used when talking about air leakage and insulation levels.
SHR
Stands for $S$ensible $H$eat $R$atio. Sensible heat ratio is the ratio of work required by the air conditioner to remove moisture, as well as maintain the sensible temperature. The higher the number the better.
TESP
Stands for $T$otal $E$xternal $S$tatic $P$ressure, which is a metric used to determine how much resistance the blower motor has to overcome for the airflow requirement of the system.
WC
Stands for $W$ater $C$olumn, which is a unit of measurement for pressure.