VAVTurndownDuringReheat
====================================================================

Brief Description
-------------------------------------------------------------------------------
When a vav box is in reheat mode, the ratio of v_dot_vav to v_dot_vav_max should be higher than when it isn't in reheat mode

Index Description
-------------------------------------------------------------------------------
   * Section 6.5.2.1 ASHRAE 90.1-2016

Datapoints Description
-------------------------------------------------------------------------------
   * flag_coil_reheat: VAV box reheat coil operation status
   * flow_volumetric_air_vav: VAV airflow rate
   * flow_volumetric_air_max: VAV maximum airflow rate

Type Verification Description
-------------------------------------------------------------------------------
Procedure-based

Assertions Type
-------------------------------------------------------------------------------
Pass

Assertions Description
-------------------------------------------------------------------------------
   * if (flag_coil_reheat == False).all():

   *     Untested

   * else: 

   *   ratio_vav = flow_volumetric_air_vav/flow_volumetric_air_max

   *   mean_reheat_ratio = df.loc[self.df[`flag_coil_reheat`], `ratio_vav`].mean()

   *   mean_no_reheat_ratio = df.loc[~self.df[`flag_coil_reheat`], `ratio_vav`].mean()

   *   if mean_reheat_ratio < mean_no_reheat_ratio:

   *     pass

   *   else: 

   *     fail

   * end