120 v hpwh

[jmaguire1]

Pull Request Description

Add 120V HPWH parameters into the model. We'll eventually want a "shared" and "dedicated" circuit HPWH model, so two different sets of parameters when it's a 120 V HPWH.

Based on unmet_wh_loads PR

Checklist

PR Author: Check these when they're done. Not all may apply. strikethrough and check any that do not apply.

PR Reviewer: Verify each has been completed.

• Schematron validator (EPvalidator.xml) has been updated
• Sample files have been added/updated (via tasks.rb)
• Tests have been added/updated (e.g., HPXMLtoOpenStudio/tests and/or workflow/tests/hpxml_translator_test.rb)
• Documentation has been updated
• Changelog has been updated
• openstudio tasks.rb update_measures has been run
• No unexpected changes to simulation results of sample files

[jmaguire1]

Not urgent but... how do we want to denote 120 V HPWHs in hpxml? I can think of a couple of options:

• Extension element(s) denoting 120V vs. 240V (the default) and if it's shared or dedicated
• Add a new "WaterHeaterType" to hpxml called "120V heat pump water heater" along side the current "heat pump water heater". This might be confusing because 120V HPWHs are a subset of HPWHs though.

Definitely think extension elements are the way to go for "shared" vs. "dedicated" circuit versions of the product since that's a manufacturer specific thing. Rheem offers two different power levels for their HPWH, but AFAIK AO Smith has not followed suit. The AO Smith 120 V HPWH just hit the market about a month ago, so we don't have all the data to model that yet.

[jmaguire1]

Thought this might be of interest: we've done a small scale ResStock test run for the dedicated circuit version, looking at our sizing routine and where you do and don't run out of hot water:

<style> </style>

Climate Zone	Count	Count with Unmet Loads > 0	% with unmet loads	Average COP	Average Energy Savings
1A	72	2	3%	2.38	3.7
2A	464	72	16%	2.60	6.4
2B	79	6	8%	2.46	6.9
3A	532	145	27%	2.57	7.3
3B	372	96	26%	2.57	9.9
3C	94	20	21%	2.72	10.9
4A	861	171	20%	2.61	7.7
4B	31	11	35%	2.30	8.1
4C	115	38	33%	2.62	7.8
5A	901	237	26%	2.72	9.6
5B	152	56	37%	2.52	8.8
6A	245	62	25%	2.47	8.8
6B	37	7	19%	2.42	5.6
7A	32	10	31%	2.06	7.0
7AK	7	3	43%	1.95	4.9
7B	4	0	0%	2.03	7.5
8AK	2	2	100%	2.93	13.0

Next up is trying to wrap up #1502, especially around how we handle multiple WHs (including handling solar correctly). I'm also working on the performance map/controls inputs for the shared circuit version, which uses a different HP and therefore a different performance map.

[shorowit]

Propose new HPXML elements for 120 V, dedicated vs shared? 120 V could apply to other appliances too (e.g., clothes dryers).