01 April 2011

With the financial support of the Emerging Technologies Program at Natural Resources Canada, DDI successfully designed and built a Rectangular, Square, Cube TM heat exchanger for heat recovery from a liquid with a high  solids content. The heat exchanger was installed for a test at a factory in the USA. The Rectangular, Square, Cube TM unit was used to recover heat from a stream of hot molasses containing approximately 65% solids. During  the test the heat exchanger operated at its designed effectiveness  and did not plug."

 Tom Jewett, P.Eng.

 Industrial Applications Officer

 CanmetENERGY

Government of Canada/ Natural Resources Canada

 Building 3, Room 204  Édifice 3, bureau 204

 1 Haanel Drive, Nepean, Ontario K1A 1M1

Telephone (613) 996-0890 ,  Facsimile: (613) 995-7868

 

 

TECHNICAL MEMORANDUM                                                               CH2MHILL

 Heat Exchanger Vendor Reviews for Approved Equipment List

 PREPARED FOR:                 Josh Shurr-Region of Halton

 PREPARED BY:                   Brandon Elliott

                                                Jose Bicudo

                                                Don Holland

 DATE:                                                June 20, 2005

 PROJECT NUMBER:            324762

 Objective

 The objective of this Technical memorandum is to report the results of the heat exchanger

vendor  reviews for the Region of Halton’s approved equipment list.

 Summary

 The heat exchangers were evaluated based on the equipment review criteria developed by

the Region, but modified to better suit the type of equipment being reviewed.  The

definitions of the terms (used as criteria) are given in the vendor  review tables in Appendix

A.  The scores were scaled to a final score out of 100, and a score of less than 50% was

considered to be a fail.  The following heat exchanger manufacturers/suppliers were

contacted: Napier-Reid, Walker, and DDI.   The three manufacturers/suppliers evaluated,

passed the review with the following scores: l) Napier-Reid - 83.3%, 2) Walker - 60.4%, 3)

DDI - 90.4%.  DDI Heat Exchangers obtained an overall higher score than the other two

manufacturers because they only have two installations in operation, which indicates

limited practical experience.  The two references provided by DDI described the heat

exchangers to be reliable and problem free, and as a result, they scored high on quality and

maintainability.   DDI also had the lowest cost of the compared heat exchangers, and scored

high in that category.  DDI was not severely penalized for a lack of references, because

references only had a weighting of  l.  The following are recommended for the approved

equipment list.

                     1)  Napier-Reid

                    2)  Walker

3)  DDI Heat Exchangers

 All of the manufacturers/suppliers passed the review and were found to be acceptable for

the approved equipment list for the Region of Halton.

 

From: Blaine McEwen
Sent: July 6,2010
To: 'erwin@ddi.ca'
Subject: Letter of Reference

 The Pembroke Pollution Control Centre is using the DDI Heat Exchanger with very positive results.  Raw sludge with an average temperature between 11* C to 19* C flows through one side of the heat exchanger and re-circulated sludge from the digesters with temperatures ranging in the high thirty’s flows through the opposite side of the heat exchanger.  This has resulted in substantial savings as the raw sludge is increased in temperature prior to entering the digesters at no expense to the City sewage system.  After almost five years of operation no plugging has occurred and it works as per specification.  I am very satisfied with the results of this piece of equipment. 

Blaine McEwen

City of Pembroke
Utilities Supervisor
Office 613-735-6821 ext. 1481
Fax    613-732-7028

 

 

5 Feb 2009

Erwin, your name is gonna stick in my mind...for several reasons: You don't quit until you've explored all options and possibilities. 

You obviously want to have satisfied customers, not just make a sale.....a person wishing only to make a sale will give it all in a couple of "blows" then, buy it or not, they're done. 

You also obviously know your business and this day and time that's not terribly easy to find. 

I thank you very much for the effort you've gone to for me on this.  It will not be forgotten. 

A question for you:  Do you ever come to the US and are you coming toward East Tennessee anytime soon?   If you were to be, i'd very much like to set up a meeting with you and our Engineering group for you to discuss heat exchangers. 

Take care and again, MANY THANKS for your help. 

Lynn Herron
Engineering Projects
(423) 534-0428

The Pembroke Pollution Control Centre is using the DDI Heat Exchanger with very positive results.  Raw sludge with an average temperature between 11* C to 19* C flows through one side of the heat exchanger and re-circulated sludge from the digesters with temperatures ranging in the high thirty’s flows through the opposite side of the heat exchanger.  This has resulted in substantial savings has the raw sludge is increased in temperature prior to entering the digesters at no expense to the City sewage system.  After almost two years of operation no plugging has occurred and it works as per specification.  I am very satisfied with the results of this piece of equipment.   

David Atkinson

City of Pembroke
Utilities Superintendent
Office 613-735-6821 ext. 1490
Cell    613-281-2141
Fax    613-732-7028

12 Sep 2007

Vitalix Inc. has been using the DDI heat exchanger almost a year now with very positive results. Raw molasses at 65% to 70% solids is running on one side and hot water on the other. We have had no problems with plugging or pressure buildup. We are also very pleased with the effectiveness of this unit in heat transfer. Thank you for your help and support. 

Plant Mgr.  Doug Olson
308-762-8358
Vitalix Inc.
Alliance NE.