HVAC Airflow & Load Calc
Air changes per hour (ACH) from airflow and room volume, or the CFM needed for a target ACH.
- Category
- Other services
- Starting price
- $0.02
- Paid calls · 30 days
- 14
- Unique payers · 30 days
- 14
Paid endpoints
7 endpoints, sorted by usage. Prices are per request.
- GET/air-changes
Air changes per hour (ACH) from airflow and room volume, or the CFM needed for a target ACH.
$0.02Base2calls / 30d - GET/duct-equivalent
Equivalent round diameter of a rectangular duct (same friction), or the second side that matches a round duct.
$0.02Base2calls / 30d - GET/duct-velocity
Air velocity (FPM) and velocity pressure (in. wg) in a round or rectangular duct from CFM, or the CFM at a velocity.
$0.02Base2calls / 30d - GET/efficiency-convert
Convert EER, COP and kW per ton, and tons, BTU/h and kW of cooling capacity.
$0.02Base2calls / 30d - GET/fan-laws
Fan affinity laws: new airflow, pressure and power after a speed change (flow ~ N, pressure ~ N^2, power ~ N^3).
$0.02Base2calls / 30d - GET/mixed-air
Mixed-air temperature of two airstreams (return plus outside air) and the outside-air fraction.
$0.02Base2calls / 30d - GET/sensible-heat
Sensible heat from airflow and temperature difference (1.08 x CFM x dT), or the CFM needed for a heat load.
$0.02Base2calls / 30d