Drainwater Heat Recovery Presentation Overview The Resource Types of Heat Exchangers Description of the GFX or Power-Pipe TM Why Use the Power-Pipe TM.

Drainwater Heat Recovery

Presentation Overview

• The “Resource”• Types of Heat Exchangers• Description of the GFX or

Power-PipeTM

• Why Use the Power-PipeTM

?• Requirements• Multi-Unit Residential

Installations


DHR is The MOST Overlooked Opportunity….

• About $6 Billion/year is spent to heat water in Canada

• Most of that heat goes down the drain• Drainwater Heat Recovery (DHR) can recovery at

least 20% of that total heat with an average simple payback of 3 years

• DHR can and will help Canada meet its pending Kyoto Commitment

• Requirement: warm-hot water being wasted


Energy Flow – Dishwashing without DHR

Assuming:Water Heating Efficiency of 70%


Energy Flow – Dishwashing with the DHR

Assuming:Boiler Efficiency of 70%DHR Effectiveness of 70%


Types of Drainwater Heat Exchangers

• Shell and tube• is used in some applications with filtration

• Plate & Frame and Spiral• is used in some applications with filtration• wide channel used for Pulp and Paper mills

• Power-Pipe Gravity Film Exchanger• doesn’t plug up; maintenance free; easily coated for

harsh drainwater• high heat transfer rate per surface area [W/m2/K]• not as compact as some other units

• Tank type with internal exchanger• inherently inefficient because of design: not

counterflow and does not effectively store the available energy


Shell & Tube

Commercial


Plate & Frame

Commercial


Tank Type

Residential & Commercial


Gravity Film Exchanger (GFX)

• 100% Copper: Type “L” Coil (ASTM B88 & B75) tightly wrapped around DWV

(ASTM B306)• DWV Diameters available: 2”, 3”, 4” & 6”• Coil connections: ½”, ¾”, 1”, 1–¼” • Lengths available: 12” – 80”• Modular, therefore multiple-pipe units are often used


Why use or specify the Power-Pipe?

• Excellent investment• Proven technology• Reliable water heater• Maintenance free

– does not plug up, virtually no fouling, no moving parts

• Uses standard plumbing parts– ULC approved, DWV conforms to ASTM

B306 and tube conforms to ASTM B88 & B75

• Reduce water heater size• Recycles energy so it is great for the environment!


GFXTM Sample Installations

Home

Goodlife Fitness Club - Kitchener

Humber College - Residence


Commercial Applications

• Health Care(Showers, Dishwasher, Cart-washer, Laundry, Kidney

Dialysis, Steam Condensate)

• Hotels(Showers, Dishwasher, Laundry)

• Restaurants (continuous dishwasher)• Laundromats (medium - large)• Multi-unit Residential Buildings

-low rise, high rise, student residences

• Recreation facilities


Industrial Applications

• Windshield manufacturing• Pulp and paper• Food processing• Breweries• Industrial parts washing• Agricultural processing• Textiles (e.g. fabric processing)• Condensate blow-down heat recovery• ….and many more


Municipalities

• Health care• Recreation facilities• Affordable housing• Waste water treatment heat recovery• Fire and Police Stations• Single industry towns

• e.g. pulp and paper mills, mines, tourism


The Power-Pipe in Apartment Buildings


The Power-Pipe in Apartment Buildings

Simple PaybacksNew: 0-6 yearsRetrofit: 2-8 years


Current Projects Short List: Apartment Buildings / Residences as of Dec 2003

• Humber College (170 Power-Pipe’s) • June-Sept 2003

• York University (109 Power-Pipe’s) • Aug.–Nov. 2003

• University of Regina (45 Power-Pipe’s) • Sept-Dec. 2003

• CFB Shadacona• January 2004

• University of Dalhousie Residence• February 2004

• Richmond Great Canadian Casino• March 2004


GFX Gravity Fed Multiple Pipe SystemsNote: This system is Patent Pending by RenewABILITY

Current Projects:-University of Calgary-Goodlife Fitness Toronto-YMCA Welland-YMCA Niagara-Peterborough Sports & Wellness-CFB Shadacona – Dishwasher


GFX Pumped Multiple Pipe System

Current Projects:-GLF Kitchener-Knitting Mill, Ontario-Summerside, PEI Wellness-GLF Mississauga-GLF Ottawa


REI TESS Ltd. (Thermal Energy Sharing Solution)

• System is installed at no cost to customer• Includes installation and meter costs• Includes maintenance costs

• Heat meters used to measure thermal energy delivered from system

• Bill 75% of energy savings quarterly (i.e. 25% of savings are kept by customer)

• After term (e.g. 20 years) ownership of system is transferred to customer


University of Regina Student Residence

• Situation: Midway through building– Did not have capital budgeted – Wanted savings and GHG reductions

• TESS proposal to provide solution with no capital cost• 45 Power Pipes to serve 154 showers & 312 students• Worked with engineers, legal & contractors to meet

installation window in Sept. 2003• Metering installed in December 2003• Estimated 42.75 tonnes of CO2 saved / year


U of R – Energy Assumptions


REI TESS Savings for U of R


Metering Strategy

• A Heat Meter costs more than a Power-Pipe

• Therefore uneconomical to install on 1 to 1 ratio

• Selected a statistically significant sample of ** metering points out of the 45 Power-Pipe’s installed

• Delta T will be relatively constant (Shower water vs. Cold water supply) so concentration was on Water Volume Meters

• ** Water Volume Meters and ** Heat Meters were installed

• Points were selected to be representative of all stacks & situations

• Centralized Data Collection Point with Modem Access


Metering Strategy


Meter Locations


Pros & Cons of the GFX DHR System – Business / OperationalCons• Space: a little more than standard drain pipes is required.• System will have a 30-50 second “warming up period” after an extended cooling period

(such as first thing in the morning)

Pros• Reduces Energy Costs (supported by NRC-CCHT Energuide Rating and CBIP Program)• Reliable and Excellent Return on Investment• No maintenance with Gravity Fed systems (e.g. apartment buildings)• Low maintenance and failsafe with Pumped systems• Very Long Life (at least 50 years)• Possible sale of CO2 Emission Credits• Reduced Risk of running out of Hot Water as HEAT is recycled thereby increasing total

hot water capacity (when standard water heaters are not operational)


Cons• Extra pipe connections on cold water supply – therefore increased maintenance risk• Needs to be designed into the system• Takes additional space• Extra pressure drop on Cold water supply (but this is minimal at 1 to 3 psi)• Heat Exchanger fouling

– the maximum amount is encountered in 2-3 months; after that the thin film doesn’t grow– Net effect: 0.5% to 1% loss in performance

Pros• Elegant Solution – simply a part of the Plumbing• Easy to include in standard plumbing designs• ULC approved for potable water & standard DWV and Type “L” copper • No moving parts when gravity fed• Does not clog like some Heat Exchangers can – it is a Drain Pipe • No maintenance of heat exchanger required• Cold water pipe after the GFX will be less prone to condensation because the water temperature

will be more likely to be above the dew point temperature• Reduced risk of maintenance due to sweating• Long Life – simple copper pipe (50 plus years)• High quality Type “L” copper fresh water coil• Double Wall Vented Heat Exchanger so no chance of cross contamination

Pros & Cons of the GFX DHR System – Technical / Plumbing


Pros• Reduces Energy Consumption • Reduces Greenhouse Gas Emissions • Reduces the Temperature of Drainwater – lessens thermal impact• Promotes the Customer’s reputation as a responsible environmental organization

Cons• None

Pros & Cons of the GFX DHR System – Environmental


Design, Quotes and Feasibility Studies

• Required Information:– Company and contact name– Load (e.g. operation schedule / occupancy, flowrate, model)– Primary water heating system– Fuel costs– Project timing

• Helpful Information:– Soft copy of CAD drawings– Industrial: drainwater characteristics– Often site specific

• At no cost RenewABILITY Energy can provide budgetary quote and feasibility study plus modifications to drawings or new drawings


Reports & Studies

• National Research Council – Canadian Centre for Housing Technology

• Energuide for Houses & R2000 rating• USDOE (numerous)• PP&L (homes)• Oakridge National Laboratory (MURB)• University of Ulster (analysis)


Notable Installations

• University of Calgary Kin. in June, 2003• Syfilco Industrial Knitting August, 2003• Cedar Corners Hotel, Tofino (rooms & dishwashing)

September 2003• Troutdale, Oregon – 202 units (2002)• Four Seasons Hotel in New Jersey (2002)


Other Planned Installations for 2004

• Goodlife Fitness – Walkley Rd. Ottawa, ON – Jan.2004 • Goodlife Fitness – South Mississauga, ON – Feb. 2004• Goodlife Fitness – Kanata, ON – March 2004 • Goodlife Fitness – Pointe Claire, QC Retrofit – April 2004 • Goodlife Fitness – Continue Rollout 1 per month • CFB Stadacona – Officers Residence Kitchen Dishwashers • Great Canadian Casino – Burnaby, B.C. – Kitchens, Laundry & Spa• YMCA Welland • YMCA Niagara • Summerside, PEI - Wellness Centre • Peterborough, ON - Wellness Centre• Cornwall, ON – Community Centre


News


Residential FAQs & Answers• Q: Will it save energy when I take a bath?

• A: A little bit but it is most effective with showers.• Q: Where should it be installed?

• A: Replace a section of the main drain stack• Q: How much is spent to heat water in homes and apartments?

• A: The national average is 25-35% of total heating• Q: How much can I expect to save?

• A: Typically, a 3-4 person family will reduce their water heating bill by 35-40%. The range is 20-50%.

• Q: The Power-Pipe is so simple, how can I be sure it works?• A: The National Research Council and Natural Resources Canada have jointly

tested the Power-Pipe and found that it works to efficiently reduce water heating costs in homes. It is also recognized by the Energuide for Houses Program.


Technical FAQs & Answers

• Q: Is the tube soldered to the drainpipe?• A: No. It would not comply with the codes if it were. It is a double-walled,

vented heat exchanger• Q: Is the GFX code compliant in Canada?

• A: YES - ULC heater exchanger for potable water• Tube: ASTM B88 & B75 Type “L”• DWV: ASTM B306

• Q: Can I install the GFX horizontally?• A: The GFX will not be efficient if installed horizontally

• Q: Water flows down a drainpipe very quickly, how is there a chance to pick up the heat?

• A: Fast flowing water works to our advantage because it flows in a thin film; that thin film of warm water readily looses its heat to the copper drainpipe

• Q: Where is the storage?• A: There is none. That type of system requires cleanout, is less efficient, and

can break down


Studies – Assisted by Ottawa Hydro

Drainwater Heat Recovery Presentation Overview The Resource Types of Heat Exchangers Description of the GFX or Power-Pipe TM Why Use the Power-Pipe TM.

Documents

total heat

customer slide

tourism slide

available energy slide

apartment buildings

maintenance costs heat

saved year slide

powerpipe tm