Drought Busting and Carbon

Crushing technologies in Food ServiceKong Sham

June 17, 2014Fisher Nickel Inc.

Food Service Technology Center

Presented by:

Drought Busting and Carbon Crushing Ideas for University

Dining

There is a synergy between water and energy use in the

kitchen.

For example, the way water drives energy use in the

dishroom.

Or, the water used for process and cooling.

Water Costs California

Source: Amin Delagah, FSTC – Water Utility Survey

Monitoring in a Medium-Sized Hotel

•Existing 86” Dishwasher: Operator spent $3,000 to

tune-up dishwasher. •Technicians missed 9,000

gal/d leak.•Conveyor rinse pressure regulator was not working,

using an extra 1 gpm. •Need for sub-metering on the

rinse and fill.•Need for smart water meters.

Tadich Grill, San Francisco

Pre-Retrofit Dishwasher and

Boiler System

Post-Retrofit Dishwasher and

Boiler System

Post-Retrofit Normalized to

racks/day

Daily Average Data

2/14/2011 - 8/30/2011

4/13/2012 - 5/3/2012

4/13/2012 - 5/3/2013

Mass Weighted Temp In (°F) 57 58 58Mass Weighted Temp Out (°F) 158 182 182Temperature Rise (°F) 101 124 124Wash Tank Fill (gal/d) 194 91 91Dishwashing hot water usage (gal/day) 2575 1009 945Total Dishwasher Water Use (gal/d) 2769 1100 1036Measured Dishwasher flow rate (gpm) 9.2 3.88 3.88Measured Boiler Gas Input for dishwasher 2,946,216 3,613,024 3,613,024Calculated (Racks/d) 975 1040 975Water savings (gal/d) 1733Water savings (hcf) 723Natural gas Savings/year (Therms) 7045

Hilton Double Tree Hotel in Fremont

This Retrofit of a Dishwasher Cost $42,500accompanied with a

$15,950 Rebate from PG&E. First Year energy Savings were

$38,980

In total: the Retrofit had a payback of 1 year!

Savings based on $5/unit, $0.17/kWh, $1.00/therm

Boiler-Based Steamer

Boilerless Steamer

http://www.fishnick.com/publications/fieldstudies/Connectionless_Steamer_Field_Study_%28revised

%29.pdf

19http://fishnick.com/saveenergy/tools/calculators/gsteamercalc.php

This Amounts to $3,663 in annual savings

an ROI of 35%!

Savings based on $5/unit and $0.13/kWh for Universities

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Combination Ovens use Boilers Too!

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Sometimes when you don’t expect it!

Install Low Flow Pre-Rinse Spray Valves

4.5 gpm 1.6 gpm 1.4 gpm 1.15 gpm 0.64 gpm$0

$400

$800

$1,200

$1,600

Example: Annual Cost to Operate

1 hr of usage per day @ $1.00/therm & $5.00/Hcf

$1,200 a year savings

Online Pre-Rinse Spray Valve Calculator

www.fishnick.com/savewater/tools/watercalculator/

No-flow Pre-rinse Spray Valve!

Thanks!Kong Sham

ksham@fishnick.com

The Food Service Technology Center (FSTC) program is funded by California utility customers

with public purpose program (PPP) funds and administered by the Pacific Gas and Electric

Company under the auspices of the California Public Utilities Commission.

Promoting:

Energy Efficiency in Commercial Food Service

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