48 lines
1.9 KiB
Markdown
48 lines
1.9 KiB
Markdown
# Definitions
|
|
|
|
<!-- NOTE: Keep these at the very bottom, if any new definitions are added then
|
|
they should also be added as links to the content section near the top. -->
|
|
|
|
### CFM50 {#cfm50-definition}
|
|
|
|
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 {#iaq-definition}
|
|
|
|
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 {#lair-definition}
|
|
|
|
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 {#load-calculation-definition}
|
|
|
|
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-definition}
|
|
|
|
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 {#shr-definition}
|
|
|
|
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 {#tesp-definition}
|
|
|
|
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 {#wc-definition}
|
|
|
|
Stands for $W$ater $C$olumn, which is a unit of measurement for pressure.
|