Cruisers Forum
 


Join CruisersForum Today

Reply
 
Thread Tools Rate Thread Display Modes
Old 14-11-2013, 23:15   #1
Registered User

Join Date: May 2013
Posts: 9
heat exchanger vs std cooling

Does anyone have information regarding the pros and cons of keel coolers vs standard cooling methods?--Thanks, Captain ray
__________________

__________________
captain ray is offline   Reply With Quote
Old 16-11-2013, 10:04   #2
Registered User

Join Date: Oct 2011
Posts: 2,434
Re: heat exchanger vs std cooling

Ray, if you give the type ,size,construction(wood,glass,metal?) and intended use of the boat, it will make it easier to come up with answers(opinions). There is nothing wrong with keel cooling, but remember that you still need a through hull and salt water pump to cool the exhaust, unless you go with a DRY STACK which tends to be much noisier. Good Luck ______Grant.
__________________

__________________
gjordan is offline   Reply With Quote
Old 16-11-2013, 11:39   #3
Registered User

Join Date: Dec 2008
Location: Oriental, NC
Boat: Mainship Pilot 34
Posts: 1,429
Re: heat exchanger vs std cooling

Keel cooling almost always includes a dry stack exhaust. If you have to install a sea water pump to cool the exhaust, why not cool the engine with the same water.

Keel coolers certainly are reliable. The glycol engine circulating pump (the one that pumps the glycol to and from the keel cooler is much, much more reliable than a raw water pump. And you may have a use for the sea water drive like a hydraulic pump or whatever.

But dry stack exhausts are bulky, require insulation and a chimney/chase to carry the heat up and out. Soot from the exhaust often falls on the boat. So they are rarely used in recreational boats.

David
__________________
djmarchand is offline   Reply With Quote
Old 16-11-2013, 11:47   #4
Senior Cruiser
 
skipmac's Avatar

Cruisers Forum Supporter

Join Date: Oct 2007
Location: 29° 49.16’ N 82° 25.82’ W
Boat: Pearson 422
Posts: 12,388
Re: heat exchanger vs std cooling

The dry stack is definitely the downside to using a keel cooler. I was all for it until someone pointed out that little detail. Had not thought of keeping a salt water pump just to cool the exhaust. That is an idea.

The other concern with a keel cooler is corrosion and potential damage to the system from bumping into debris or whatever.
__________________
The water is always bluer on the other side of the ocean.
skipmac is offline   Reply With Quote
Old 16-11-2013, 19:11   #5
Registered User
 
stillbuilding's Avatar

Join Date: Jan 2008
Location: Hong Kong
Boat: Custom Freya 20m
Posts: 961
Quote:
Originally Posted by captain ray View Post
Does anyone have information regarding the pros and cons of keel coolers vs standard cooling methods?--Thanks, Captain ray
I chose to keel cool to avoid the issues that go with failed salt water impellers, the risk of engine overheating due to blocked intake. I still have salt water for exhaust cooling so is not a complete solution but exhaust heating probably slower onset and more time to intervene. Keel cooling probably better in heavily silted, shallow areas or with lots of plastic. Arguably eliminates the issues of engine flooding with prolonged starting problems - minor virtue. One less intake to fail.
__________________
stillbuilding is offline   Reply With Quote
Old 16-11-2013, 19:14   #6
Registered User
 
stillbuilding's Avatar

Join Date: Jan 2008
Location: Hong Kong
Boat: Custom Freya 20m
Posts: 961
Quote:
Originally Posted by skipmac View Post
The other concern with a keel cooler is corrosion and potential damage to the system from bumping into debris or whatever.
On a steel boat the cooling runs are welded on channel and not easily damaged. Appropriate fairing probably reduces risk in other hull materials.
__________________
stillbuilding is offline   Reply With Quote
Old 16-11-2013, 19:15   #7
Nearly an old salt
 
goboatingnow's Avatar

Cruisers Forum Supporter

Join Date: Jun 2009
Posts: 13,649
Images: 3
Re: heat exchanger vs std cooling

I know of several keel cooler installations where the engine can not be used off any length of time under any load, if the boat is not moving through the water !

dave
__________________
Check out my new blog on smart boat technology, networking and gadgets for the connected sailor! - http://smartboats.tumblr.com
goboatingnow is offline   Reply With Quote
Old 16-11-2013, 19:31   #8
Registered User
 
stillbuilding's Avatar

Join Date: Jan 2008
Location: Hong Kong
Boat: Custom Freya 20m
Posts: 961
Quote:
Originally Posted by goboatingnow View Post
I know of several keel cooler installations where the engine can not be used off any length of time under any load, if the boat is not moving through the water ! dave
Inadequately designed/built obviously. There is good design data available that i have found in texts previously. I did the calcs then doubled it - no problem in steel.
__________________

__________________
stillbuilding is offline   Reply With Quote
Reply

Tags
cooling, heat exchanger

Thread Tools
Display Modes Rate This Thread
Rate This Thread:

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




Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -7. The time now is 16:55.


Google+
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
Social Knowledge Networks
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.

ShowCase vBulletin Plugins by Drive Thru Online, Inc.