Engineering cutaway
Enter design conditions
Enter chilled water flow and temperatures. The coil outlet, supply conditions and delivered TR update as you change them.
The wheel exchanges energy with extract air. The horseshoe heat pipe transfers heat across the cooling coil within the same supply airstream.
In air-target mode the CHW temperatures define a design ΔT for required flow. In water-flow mode the entered CHW temperatures and flow define available capacity. The model uses a simplified coil approach. Real coil duty and water outlet depend on selection and control; verify with measured values and a manufacturer schedule.
Start at the outdoor intake
Spin the recovery wheel
Two separate streams pass opposite sides of a rotating wheel. It can transfer sensible heat; an enthalpy wheel can also exchange moisture. Performance and leakage depend on its design.
*Simple sensible-only illustration: entering temperature moves toward extract temperature by selected effectiveness. Actual value requires manufacturer selection.
Try a hot day
Wheel rotation, belt/motor, seals, purge arrangement, air pressure relationship and clean sections. Check whether heat recovery is actually specified for this FAHU.
Where does water come from?
Make it rain
At 101.3 kPa; assumes saturated air at the coil exit whenever coil leaving dry bulb is below outdoor dew point. This shortcut ignores bypass factor, actual apparatus dew point and changing air density. Use selected coil data for design.
Press a condition, watch the sequence
BMS point board
Temperature and humidity sensors report conditions. The controller compares them with approved setpoints, drives valve/fan/damper outputs, then verifies feedback and alarms.
This is a teaching sequence. Fire response, low temperature protection, fail positions and setpoints must follow the project cause-and-effect and selected controls.
Site walk: uncover the hidden checks
Select each zone to reveal one physical verification. Tick it when the trainee can explain the evidence to collect.
Fault detective
Pick a symptom, choose the next best check, then reveal the measurement route.
Five-minute graduate check
Answer from the pictures and experiments. Each answer gives immediate feedback.