HPWH incorrect handling of large draws

[chipbarnaby]

HPWH::runOneStep() reports output temp as 0 when the draw during the step exceeds the tank volume.

This situation can be duplicated with the attached files.

Procedure --

1. Put breakpoint(s) in HPWH.cc function HPWH::updateTankTemps() at line 2883 if (drawVolume_L > tankVolume_L)
2. Run BK.cse file in a debug build. There are a number of small energy balance errors, please ignore (to be pursued later). This simulation is set up with 60 substeps per hour so each CSE subhour has a single HPWH call.
3. The large draw case occurs a few times during the annual simulation and should hit the breakpoint.
4. Analyze and fix.

BK.zip

[spahrenk]

I see the problem. Will have a fix posted soon.