1 NORTHWEST ENERGY EFFICIENCY ALLIANCE

Combo products: Space + Water

Market Drivers and Field Testing Status

2

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

3

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?

4

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?

5

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?

6

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

7

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

15

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)?

17

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)

18

Backup Slides

19

Monitoring Configuration