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  #1  
Old 01-01-2013, 12:51 PM
bmor_62's Avatar
83 300SD WVO Blend
 
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FPHE question. Flat Plate Heat Exchanger (FPHE)

Can I run a FPHE year round or does it have to be plumbed in with valves to disengage during the hotter months?
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  #2  
Old 01-01-2013, 05:00 PM
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83 300SD WVO Blend
 
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This application is for the aforementioned 83 300SD, running a WVO/Diesel blend of 60% to 80% WVO depending upon the ambient temperature, single tank, no heat added yet.
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  #3  
Old 01-01-2013, 09:48 PM
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FPHE

You can run it all year long, it does not heat that much it only gets as hot as the coolant.
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  #4  
Old 01-04-2013, 02:30 PM
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good luck with that
 
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I see two possible concerns.

First, is the fuel lubricating the IP enough? This wouldn't be a problem with veg, but might be a problem with #2.

Second, is the veg in the tank getting hot? If so you increase the rate of oxidative polymerization. If you're looping the veg return this obviously won't be a problem. I'm currently sending the veg back to the tank, and on a hot day the tank can get very warm. I've been getting less than 2k out of my veg filters. My problem is either a) insufficient prefiltering (I filter to 1 micron but I tend to wash out the poly bag filter and reuse it, which I'm going to stop doing); b) beasties growing in the oil; or c) little bits of polymerized veg "fruit leather" from the warm tank detaching and ending up in the filter.
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  #5  
Old 01-04-2013, 02:33 PM
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good luck with that
 
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In other words, if you're still in the planning stages, get three valves and loop the veg return! (with an option for sending back to tank for purging) If I ever get around to upgrading my system this is on my list.
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  #6  
Old 01-06-2013, 09:23 PM
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i run fphe year round, no problems. Yes loop your return it is worth the extra cost in saved filters. I do have a shut off valve for all coolent flow to veg system so i could fill up with diesel if i don't have any vo
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  #7  
Old 01-07-2013, 08:55 PM
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Are there still advantages to a looped return on a single tank blending scenario?
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  #8  
Old 01-07-2013, 09:35 PM
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i would say yeah because, the hot unused fuel won't be returning all the way to tank and then bring in colder fuel again, it will just keep circulating the hot and filtered fuel, and also longer filter life. This is all pending how u plumb it and how it's heated too.
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  #9  
Old 01-27-2013, 08:32 PM
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Use a 3 way valve at the return T of a looped system. That way you can switch to a normal return when you change filters to purge the air.
Then switch it back to loop when finished.
Have fun.
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  #10  
Old 01-27-2013, 08:55 PM
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I would suggest pluming a ball valve in the hot water supply line for the system.

Unnecessary heating of your fuel can lead to unwanted effects.

Inexpensive and easy element of control that can be added to your system.
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Last edited by whunter; 01-30-2013 at 06:38 AM. Reason: spelling
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  #11  
Old 02-24-2013, 05:11 PM
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I got my FPHE. I am going to pick up some hose barbs; All the ports on the FPHE are 1/2" NPT females, so I need to get 1/2" male to 5/16 for fuel and 1/2" to 1/2 for coolant, correct?
Oh and I need to get a tee for the coolant and a ball valve as well.
Just thinking out loud here fellas, trying to get all I need in one trip.
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  #12  
Old 02-26-2013, 09:06 AM
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You should be able to find all the brass from Ace or a local plumbing store. Those sizes sound correct
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  #13  
Old 02-26-2013, 01:04 PM
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Quote:
Originally Posted by bmor_62 View Post
trying to get all I need in one trip.
Hope springs eternal
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  #14  
Old 02-27-2013, 08:14 PM
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Quote:
Originally Posted by bmor_62 View Post
I got my FPHE. I am going to pick up some hose barbs; All the ports on the FPHE are 1/2" NPT females, so I need to get 1/2" male to 5/16 for fuel and 1/2" to 1/2 for coolant, correct?
Oh and I need to get a tee for the coolant and a ball valve as well.
Just thinking out loud here fellas, trying to get all I need in one trip.
1/2 5/16 for the fuel lines is correct. I like the 90 degree ones. But those are hard to find. You'll probably end up with a 1/2 to 3/8 reducer and then a 3/8 to 5/16 fitting.
For the hot water you'll need 1/2 to either 5/8 for the lower heater line at the boost pump and 1/2 to 3/4 for the upper heater line coming out of the head.
Get a cross flow going so the 2 fluids are traveling in opposite directions. You'll get better heat transfer.
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  #15  
Old 02-28-2013, 06:11 PM
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83 300SD WVO Blend
 
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This raises the question, where do you suggest is the best place to tap in and return the hot coolant? I'd guess at the head you'll get the hottest coolant.
Quote:
Originally Posted by Fattyman View Post
1/2 5/16 for the fuel lines is correct. I like the 90 degree ones. But those are hard to find. You'll probably end up with a 1/2 to 3/8 reducer and then a 3/8 to 5/16 fitting.
For the hot water you'll need 1/2 to either 5/8 for the lower heater line at the boost pump and 1/2 to 3/4 for the upper heater line coming out of the head.
Get a cross flow going so the 2 fluids are traveling in opposite directions. You'll get better heat transfer.
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