Reply
 
Thread Tools Search this Thread Display Modes
 
Old 11-12-2019, 12:49 AM   #1
Guru
 
syjos's Avatar
 
City: Gig Harbor
Country: USA
Vessel Name: Sandpiper
Vessel Model: Bluewater 40 Pilothouse Trawler
Join Date: Nov 2012
Posts: 885
Plate heat exchanger vs tube exchangers

What are the pros and cons of plate heat exchanger VS tube heat exchanger in a boats hydronic heating system to transfer engine heat to the hydronic when under way?

The plate heat exchanger seems small compared to a similar BTU SeaKamp style tube heat exchangers.
__________________
Advertisement

syjos is online now   Reply With Quote
Old 11-12-2019, 07:10 AM   #2
FF
Guru
 
FF's Avatar
 
Join Date: Oct 2007
Posts: 19,844
The guts of a tube cooler can be cleaned on board with a rifle brush,and a gasket or two.

Should it leak , most radiator shops can re-solder the bundle with ease.
__________________

FF is offline   Reply With Quote
Old 11-12-2019, 10:11 AM   #3
Guru
 
Rebel112r's Avatar
 
City: Birch bay wa
Country: USA
Vessel Name: Rogue
Vessel Model: North Pacific 42
Join Date: Feb 2013
Posts: 567
On the project I just finished, I chose the plate style. I think either would work. Lots of info out there comparing both. Cost of my 20 plate SS exchanger was $120 bucks, cheap I thought. I did not know what a plate exchanger was before I started shopping around. Lots of choices out there.
Rebel112r is offline   Reply With Quote
Old 11-12-2019, 10:21 AM   #4
Guru
 
O C Diver's Avatar
 
City: Fort Myers, FL... Summers in Crisfield, MD
Country: USA
Vessel Name: Slow Hand
Vessel Model: Cherubini Independence 45
Join Date: Dec 2010
Posts: 7,717
I've only had a plate exchanger on a Grey Marine 6-71. It cooled the oil by exchanging the heat into the freshwater coolant. I removed it and cleaned the oil side, pretty easy. Can't imagine using one where salt raw water is circulated in the plates.

Ted
__________________
Blog: mvslowhand.com
I'm tired of fast moves, I've got a slow groove, on my mind.....
I want to spend some time, Not come and go in a heated rush.....
"Slow Hand" by The Pointer Sisters
O C Diver is online now   Reply With Quote
Old 11-12-2019, 11:50 AM   #5
Guru
 
syjos's Avatar
 
City: Gig Harbor
Country: USA
Vessel Name: Sandpiper
Vessel Model: Bluewater 40 Pilothouse Trawler
Join Date: Nov 2012
Posts: 885
Quote:
Originally Posted by O C Diver View Post
I've only had a plate exchanger on a Grey Marine 6-71. It cooled the oil by exchanging the heat into the freshwater coolant. I removed it and cleaned the oil side, pretty easy. Can't imagine using one where salt raw water is circulated in the plates.

Ted
My application would be antifreeze in the engine coolant to antifreeze in the hydronic heating system.

A 40,000 Btu btu tube heat exchanger is 4" X 24" and the plate exchanger appear smaller for the same Btu rating.

I'm curious why tube exchangers are more prevalent than plate exchangers in hydronic heating systems to transfer engine heat.
syjos is online now   Reply With Quote
Old 11-12-2019, 12:17 PM   #6
DDW
Guru
 
City: San Francisco
Country: USA
Join Date: Apr 2018
Posts: 952
I've have plate exchangers in this application in two boats. In one of them, it developed a leak between the two systems, such that the engine pumped coolant into the hydronic system. The vendor said "this never happens" yet it did. Both sides of the exchanger are subject to pressure cycling as the engine and heating system heat and cool. From an engineering perspective, the tube type would be more robust. I replaced that exchanger with another plate one, and haven't had a recurrence in that boat or the other one.
DDW is offline   Reply With Quote
Old 11-12-2019, 12:52 PM   #7
Guru
 
C lectric's Avatar
 
City: B.C.
Country: Canada
Vessel Name: Island Pride
Vessel Model: xxxx
Join Date: Oct 2007
Posts: 2,509
Plate exchangers are more compact for the same heat transfer ability.
They can be more of a pain to service and because of the close plate spacing may clog more readily.
Keep your fluid CLEAN.

I,ve dealt with a few at my job, long gone. But maintained and kept clean with prop fluid should do just fine.
C lectric is online now   Reply With Quote
Old 11-12-2019, 01:13 PM   #8
Guru
 
City: Carefree, Arizona
Country: usa
Vessel Name: sunchaser V
Vessel Model: DeFever 48
Join Date: Apr 2008
Posts: 8,127
My Hurricane II system has a plate exchanger for the exact purpose the OP is asking about. It is about the size of a cigar box. It works great, heating the hydronic coolant (valved off one engine) in all winter conditions we've encountered in the past 13 years since installing it.
sunchaser is offline   Reply With Quote
Old 11-12-2019, 01:17 PM   #9
Guru
 
AusCan's Avatar
 
City: Adelaide
Country: Australia
Vessel Name: Kokanee
Vessel Model: Cuddles 30 Pilot House Motor Sailer
Join Date: Jul 2012
Posts: 2,902
If you recirculating clean fluids, the plate exchangers are the way to go. They have more contact area which gives better efficiency. Easy to clean and maintain.
The wall thickness is often thinner in comparison to tube exchangers, so just make sure that they are manufactured with a suitable quality material.
__________________

AusCan is offline   Reply With Quote
Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off





All times are GMT -5. The time now is 11:08 AM.


Powered by vBulletin® Version 3.8.8 Beta 4
Copyright ©2000 - 2019, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2006 - 2012
×