Commercial Ice-Makers May 27, 2008 RTF Meeting Calculator Update

Ice-Makers Background There are about 75,000 commercial ice-makers in the PNW Various types Cubes, Flakes, Crushed, Nuggets Only the “cube” types have ARI ratings, so we will ignore flake, crushed, and nugget types – for now Six “Varieties”: 1.Ice-Making Head Unit; air-cooled 2.Ice-Making Head Unit; water-cooled 3.Remote-Condensing Unit; air-cooled 4.Remote-Condensing Unit; water-cooled 5.Self-Contained Unit; air-cooled 6.Self-Contained Unit; water-cooled Capacity is “lbs ice/day” at either 70°F ambient, 50°F entering water; or 90°F ambient, 70°F entering water (ARI)

Why Update? CEE Tier 1 has become popular in the region/country – Oregon and Washington have put in place minimum efficiency standards equivalent to CEE Tier 1 – Federal minimum standard expected to become effective in 2010 – CEE Tier 1 Energy Star has adopted efficiency standards for air- cooled equipment – Equivalent to CEE Tier 2

The New Specs

Incremental Cost Analysis MSRP was multiplied by 0.5 to get “Cost” – MSRP was about 2 X what most online stores were selling equipment for – Data primarily came directly from Manufacturer’s List Pricing Some came from internet equipment sales companies (MSRP) Did not find Cornelius pricing

Note: – Hoshizaki has a 406 lb/day model that was omitted from this analysis

Water Use Potable Water Use (All Systems) – OR/WA/Fed don’t have a standard – CEE/Energy Star have maximum of 35 gal/100lb ice for self-contained units and 25 gal/100lb ice for all other units Condenser Water Use (Water Cooled Systems Only) – OR/WA/Fed have a maximum water use standard – CEE doesn’t have a standard because they require systems to be on closed loops – Energy Star doesn’t have a standard for water cooled systems Determined Average Potable Water Savings using ARI Data – (AvgWaterUse OR/WA Code – AvgWaterUse EnergyStar ) – Results: Unit Type Average Potable Water Use Savings (gal/100 lb ice) IMH A1.5 IMH W0.8 RCU A1.4 SC A2.6 SC W1.0

Calculator’s Major Assumptions/Revisions User Inputs Incremental Cost Consistent with Previous RTF Calculator However, incremental cost will be difficult for the user to determine Measure Life = 10 years Previous RTF Calculator: 20 years PG&E Work paper: 12 years (comes from DEER estimate for food service equipment) CEE/ADL: 7 to 10 years 4400 hours per year (or 50% duty cycle) Previous calculator and FEMP assumptions used 3000 hours per year ADL 1996 study gives 50% duty cycle (4400 hrs) at 70°F ambient/50°F entering water FSTC uses 75% duty cycle based on “ideal sizing” in their Food Service Equipment Workpaper for PG&E Monitoring of 8 units (7 restaurants, 1 cafeteria) showed an average duty cycle of 56%, median 49%, stdev 20% Source: Food Service Technology Center. “A Field Study to Characterize Water and Energy Use of Commercial Ice-Cube Machines and Quantify Saving Potential” December 2007 Energy Savings Calculation: Since we do not have sales weighted data to establish baseline or upgrade efficiency, savings calculations use the user-entered capacity (lbs ice/day) to determine baseline and upgrade energy use: Baseline: OR/WA/Fed minimum energy use (kWh/100 lbs of ice) at ARI conditions –Previous RTF Calculator used a curve fit of the “average” of the ARI database Upgrade: Energy Star level (or CEE Tier 2) energy use (kWh/100 lbs of ice) at ARI conditions –Previous RTF Calculator used the installed case Added water savings –Includes PV benefit of buying less water –Includes wastewater system energy savings

Proposed RTF Ice-Maker Standards All systems must be ARI certified Air-Cooled systems must meet Energy Star Standards Water-Cooled systems must meet CEE Tier 2 standards and condenser water must be supplied from a closed loop system or a system with a remote evaporative condenser.

Decisions Apply updates/changes to the calculator? Adopt new Ice-Maker standards?