Issue overview

In running a model with an desuperheater object, whenever WATER HEATER:Water Heater Heating Energy [J](Hourly) is not 0, I would expect:

DESUPERHEATER:Water Heater Heating Energy [J] / (ASHP CLG COIL:Cooling Coil Electric Energy [J] + ASHP CLG COIL:Cooling Coil Total Cooling Energy [J]) = 0.25,

which is the Rated Heat Reclaim Recovery Efficiency defined in idf.
IDF desuperheater snippet:

Coil:WaterHeating:Desuperheater,
desuperheater,            !- Name
  ,                                 !- Availability Schedule Name
Desuperheater Setpoint Temp,  !- Setpoint Temperature Schedule Name
5,                       !- Dead Band Temperature Difference {deltaC}
0.25,                    !- Rated Heat Reclaim Recovery Efficiency
50,                      !- Rated Inlet Water Temperature {C}
35,                      !- Rated Outdoor Air Temperature {C}
60,                      !- Maximum Inlet Water Temperature for Heat Reclaim {C}
,                          !- Heat Reclaim Efficiency Function of Temperature Curve Name
DesuperheaterIn,         !- Water Inlet Node Name
DesuperheaterOut,        !- Water Outlet Node Name
WaterHeater:Mixed,       !- Tank Object Type
water heater,                  !- Tank Name
Coil:Cooling:DX:SingleSpeed,  !- Heating Source Object Type
ashp clg coil,         !- Heating Source Name
0.001,                   !- Water Flow Rate {m3/s}
,                        !- Water Pump Power {W}
0.2;                     !- Fraction of Pump Heat to Water

Results:

DESUPERHEATER:Water Heater Heating Energy [J] / (ASHP CLG COIL:Cooling Coil Electric Energy [J] + ASHP CLG COIL:Cooling Coil Total Cooling Energy [J]) :

Water heating energy:

The highest reclaimed ratio is just about 0.1+. Why couldn't we reclaim more to save water heating energy?

Details

Some additional details for this issue (if relevant):

• Platform (Windows 10)
• Version of EnergyPlus (E+ 9.1.0)
• Unmethours link or helpdesk ticket number

Checklist

Add to this list or remove from it as applicable. This is a simple templated set of guidelines.

• Defect file added (list location of defect file here)
• Ticket added to Pivotal for defect (development team task)
• Pull request created (the pull request will have additional tasks related to reviewing changes that fix this defect)