Tools › Building Systems › HVAC Equipment

HVAC Equipment

2 tools in the Building Systems area.

Fan Operating Point

Where a fan will run on a given system: the catalog fan curve (airflow against pressure at the test speed) is scaled to the operating speed by the fan laws, the system is a parabola through its design point (Δp ∝ Q²), and the operating point is their intersection. The tool reports the airflow and pressure delivered, the air and shaft power, the speed that would put the fan exactly on the design point, and whether the point sits in the stable part of the curve. Enter the curve points in rising airflow; a power column, if the catalog gives one, lets the tool read the efficiency instead of assuming it.

Hydronic Pipe Sizing

Velocity, friction loss and pump head for the pipe segments of a hydronic (chilled- or hot-water) circuit: each segment takes a flow, a length, a nominal Schedule 40 steel size (or a custom inside diameter) and a sum of fitting loss coefficients; the tool computes the velocity, Reynolds number, Colebrook friction factor and head loss of each, checks them against the usual velocity and friction-rate limits, sums the series path to the pump head and gives the pump power. A friction chart for every standard size shows where each segment sits.

Other Building Systems sections

HVAC Loads · Ducts and Airflow · Psychrometrics · Ventilation and Air Quality · Energy · Plumbing · Fire Protection · Lighting and Electrical · Controls and Commissioning · Codes and Compliance