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1 NORTHWEST ENERGY EFFICIENCY ALLIANCE
Combo products: Space + Water
Market Drivers and Field Testing Status
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Technology Overview
Two zone (1 zone for indoor space heating/cooling, 1 for water heater)
Inverter driven compressor outdoor unit (conventional refrigerant)
Outdoor Unit
Indoor Unit
Water Heater
Note: CO2-based system covered separately near end of presentation
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Advantages of Combo System
More savings…HVAC and water served via inverter-driven compressor/CO2 compressor, no space heater interaction from HPWH
Install location flexibility…no cold air indoors, no indoor noise, smaller tank space
Supply chain efficiencies…customer acquisition, sales, installation, support lower total consumer costs?
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Challenges for a Combo System
Product Complexity
Higher first cost hurdle
Different lifecycles/buying cycles for HVAC and water heaters
Lack of “single source” installers for HVAC/plumbing/electrical?
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Potential Target Markets (NW numbers)
Single-family (electric space + electric water) 95% baseboard heated homes – 478k homes 100% eFAF homes – 224k homes
SF new construction (low load homes)
Manufactured homes (new and retrofit)
Multi-family?
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Field testing Overview
Three proof-of-concept units installed since April 2014
2 of 3 sites are not good standard HPWH candidates (interior closet water heater location)
2 sites are heavy hot water users (80+ gallons/day)
Plan to continue monitoring thru end of March
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Site overviews
Site #1: Bend, Oregon (high desert climate). Small house. Some sub-zero temps this winter. Displacing 100% of electric furnace heat.
Site #2: Portland. Typical 3 bdr ranch. Heavy hot water usage. Heating supplemented with baseboards in bedrooms.
Site #3: Portland. Large home. Heavy hot water usage. Heating supplemented with Cadet wall heaters.
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Completed Installation Pictures
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Customer Satisfaction is High
Pleased with distribution of heat within the house (typical of DHP installs)
Hot water is hot water: no surprises 2 sites are very high water usage sites
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Early Field Test Results
HomeCooling
EfficiencyHeating
COPHeating
Efficiency
Water Heating
COP
% Water Heat Done
by Elements
SW Portland 21.5 3.4 11.6 1.9 27%
Gresham 21.7 3.5 11.9 1.7 32%
Bend 19.0 3.2 10.9 1.7 10%
Average 20.7 3.4 11.5 1.8 23%
First round of field testing yielded both encouraging results (heating/cooling) and room for improvement (water heating).
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Sample of Issues Identified
Short Cycling of indoor unit
High use of heating element for water heating
4/3/14 17:45 4/3/14 20:09 4/3/14 22:33 4/4/14 0:57 4/4/14 3:21 4/4/14 5:450
500
1000
1500
2000
2500
3000
3500
4000
6065707580859095100105110
Watts Supply Air Return Air
Wat
ts
℉
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High Heating Element Use - Solution
Firmware update to modify control algorithms –
Updated control sends more refrigerant to the water heater when simultaneously water and space heating.
Old Control Algorithm
New Control Algorithm
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CO2-based Combo System Pilot Project
Funded by BPA, Managed by WSU, w/ matching funds from NEEA, using Sanden CO2 systems
NEEA match covers instrumentation & monitoring costs, individual system design and spec assistance
Most pilot project sites are NEEA Next Step Home projects in three climate zones
No restriction on type of hydronic system used (floor radiant, fan/coil, forced air, etc.)
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CO2 HP(outdoor)
City water
Th1
Hot water supplyto house
WP2WP1
TankUnit
SpaceHeating
T
Sanden Recommended Plumbing and Control Logic
Heat Exchanger
System Configuration
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CO2 Project Time Line
First system installed Nov 2014
Next 7 systems installed by Sep 2015
Data collection for 13+ months
Data analysis early 2016
Sanden designing North American system now
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Market Transformation Questions
Positive reinforcement for adoption of HPWHs and broader Federal Standards?
Impact on standalone DHP sales?
Will combo products speed displacement of electric resistance heating (water and space)?
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Next Steps
Completion of current field tests
Mitsubishi…product updates, firmed up commercialization plans…more field testing
Sanden/CO2…field testing
Incorporate combo systems into overall residential HVAC/DWH strategy (under development)
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Backup Slides
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Monitoring Configuration