Wacky paraffin wax thermal reservoir - Fuelly Forums

Click here to see important news regarding the aCar App

Thread Tools Display Modes
Old 07-09-2006, 01:32 PM   #1
Registered Member
GasSavers_brick's Avatar
Join Date: Mar 2006
Posts: 162
Country: United States
Wacky paraffin wax thermal reservoir

A thread on GH took an interesting turn the other day, and I figured the topic is worth bringing to you guys. We know that the Prius II uses a thermos bottle to keep engine coolant hot between cold starts in order to reduce warmup times, improving both emissions and fuel economy. We can accomplish this with an engine block heater, but folks like me can't implement that due to inaccessible A/C power (live in an apartment). One possible solution is to use a phase-change thermal reservoir, which would store tremendous amounts of heat for a longer period of time.

The concept is to run engine coolant through some kind of insulated bottle that contains ~10lb of something like paraffin wax, which picks up loads of energy from the engine coolant as it changes to a liquid. The heat is stored overnight, and rapidly warms up the engine coolant the next morning to temps that are very near nominal.

Now, I haven't crunched any numbers of my own yet so I'm just taking it on faith that this is actually feasible. But how crazy do you guys think it would be to try this as a project? The way I see it working is this: the wax would be stored inside of a large thermos bottle, with a small heater core sealed within it. Engine coolant runs through that heater core and naturally picks up or pulls heat from the wax. Some kind of valve would be necessary to close both ends of the bottle when the engine is shut down in order to reduce thermal losses while parked.

Any better ideas for a system that could be added as a retrofit? Reasons that my heater core/thermos thing would fail miserably?

'07 Toyota Prius
GasSavers_brick is offline   Reply With Quote
Old 07-09-2006, 01:37 PM   #2
Registered Member
krousdb's Avatar
Join Date: Feb 2006
Posts: 1,480
Country: United States
Location: Myrtle Beach, SC
I have a lot of space under my hood for such a reservior. The only concern I would have is that the piping thru the reservior would cause the wax on the surface of the piping to solidify and act as an insulator to the liquid wax.

krousdb is offline   Reply With Quote

Thread Tools
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

Similar Threads
Thread Thread Starter Forum Replies Last Post
How do I change the EPA Estimates Thrasymachus Fuelly Web Support and Community News 2 08-19-2008 06:58 AM

» Fuelly Android Apps
Powered by vBadvanced CMPS v3.2.3

All times are GMT -8. The time now is 06:35 AM.

Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2024, vBulletin Solutions, Inc.