Tstat equipment

[jmaguire1]

Creating an abstract class for thermostatic loads, including HVAC and water heating. Making lots of other changes too.

Work that is complete and in progress:

• Create ThermostaticLoad class
• Replace on/off "Mode" variables and outputs with "On Fraction" variables and outputs
  • Water heating
  • HVAC
  • Other loads
  • Move update_mode_times to update_results and update reset_time
  • Incorporate load fraction and other ext controls in on fraction
• Update Equipment.update_model function to always call run_internal_control
  • Modify function
  • Create new variables for external controls
• Add new tstat mode to prevent overshoot
  • Add method in run_internal_control
  • Test for water heating
  • Test for HVAC
• Update Simulator.update function to consolidate control_signal and schedule_inputs (maybe wait on this)
  • Modify function
  • Change/merge controls and schedule names
  • Maybe replace current_schedule with individual variables
  • Update example scripts and docs
• Remove duty cycle control functions, and related inputs and outputs in docs
• Remove Mode related inputs and outputs in docs
• Add new inputs and outputs in docs
  • prevent_overshoot
  • on fraction outputs

Still need to review issues and see which this will address.

• Reference the issue your PR is fixing
• Assign at least 1 reviewer for your PR
• Test with run_dwelling.py or other script
• Update documentation as appropriate
• Update changelog as appropriate

[jmaguire1]

@mnblonsky: what happened was #140 was based on ev1.7, which I closed since it'd been merged. Didn't lose any of your commit history or anything, I think this should just supersede what was there.

[mnblonsky]

Noting that this covers #95. It probably covers other issues too.

[mnblonsky]

Here's a very quick overview of what's been done to date:

• Removed duty cycle controls for equipment that modify on/off status across multiple time steps
• Removed Equipment.mode field and replaced with Equipment.on as a boolean field. Some equipment have additional fields, e.g., HPWH has hp_on and er_on. Also removed/revised other related fields, like time_in_mode.
• Created a ThermostaticLoad class that will by inherited by all water heater and HVAC classes, and moved similar code there.
• Updated most water heater classes to work with ThermostaticLoad.
• Modified order of operations within Equipment.update_model to make external control implementation simpler.