VAVMinimumTurndownDuringReheatPressureReset

Brief Description

When a vav box is in reheat mode, the ratio of vav airflow rate to vav max airflow rate must not be greater than the min design turndown ratio and the pressure setpoint must remain the same

Index Description

Section 6.5.2.1 ASHRAE 90.1-2016

Datapoints Description

reheat_coil_flag: VAV box reheat coil operation status

V_dot_VAV: VAV airflow rate

V_dot_VAV_max: VAV max airflow rate

VAV_min_turndown_design: design VAV box min turndown ratio

P_set: duct pressure setpoint

turndown_tol: VAV turndown tolerance

P_set_tol: pressure setpoint tolerance

Type Verification Description

Rule-based

Assertions Type

Pass

Assertions Description

if reheat_coil_flag:

if V_dot_VAV_max == 0:

Untested

if V_dot_VAV_max > 0.0 and V_dot_VAV / V_dot_VAV_max > VAV_min_turndown_design + turndown_tol:

if P_set_prev is None:

Untested

elif abs(P_set - P_set_prev) > P_set_tol:

Untested

else:

fail

else:

pass

else:

Untested

end