Gen II Prius ICE Radiant Heat Reflector
I've got a piece of "super insulation/radiant barrier," made up of heavy duty
aluminum foil bonded to both sides of 1/4 inch thick plastic foam. The piece is about 36 in. by 48 in. I'm thinking about using it as a radiant heat reflector/thermal blanket over the top of the ICE in my Gen II. The goal is to help retain heat as the temps drop and help keep FE/MPGs up. I won't cover the electronics package/DC to DC converter, as I don't want/need it kept warm. By cutting the sheet in half, I can extend the blanket about halfway down between the ICE and the radiator and keep well away from the serpentine belt on the far passenger side of the ICE. By feeling over the top and behind the ICE, I can cover it, and maybe extend the insulation /barrier half way down the back side. I can work the two pieces of insulation around the various bits of piping and wiring at the front of the ICE, and between the ICE and electrical boxes going to the rear. As I'm not going to try to mold the insulation tightly to the block/head, there will still be an airspace and some moving air between the insulation/barrier and the block. I expect that the only real contribution to heat retention will be to reflect radiant heat back to the block. I'm thinking the insulation/barrier will stay in place due the many bends and curves created in working it into place. I use grill blocking already. I'm using a ScanGaugeII, so I can monitor ICE temps. My questions are: * Has anyone experimented with something like this? * If so, did you see any noticeable/measurable FE/MPG results? * Did you encounter any problems, or incur any damage? I welcome constructive comments, suggestions, concerns, etc. (I know what you're thinking.... No, there isn't enough left over foil/foam/foil to make an insulated aluminum foil hat. :rolleyes: ) A tip o' the hat to Frank Lee and SeanT whose threads got me thinking along these lines: http://ecomodder.com/forum/showthrea...-em-10529.html http://ecomodder.com/forum/showthrea...ly-6052-2.html |
I'm pretty sure someone has made an engine blanket that wraps around the entire engine on either the Prius II or Insight I. I can't remember though. He was definitely running in in winter, not sure weather he was running it in summer though.
I'm seriously thinking about adding some insulation to the Prius. The coolant temps drop fast enough in summer with the engine off as much as it is. In winter, it'll definitely be beneficial to insulate. |
Doax,
Here it is: http://ecomodder.com/forum/showthrea...gine-6359.html Good reading. Be sure not to miss this imbedded link, you're gonna love it: Randall's Insight - MIMA Honda Insight Modified Integrated Motor Assist Enjoy! |
Time for a preliminary assessment of this proposed cold weather
thermal retention enhancement. I've been doing my regular ~28 mi. round trip commute and weekend errands runs with the radiant barrier in place on my Gen II for 13 days now. Temps have been between 43 and 63 degF. I'm also running a full upper grill block, and all but the lowest slot on the lower grill blocked. The radiant barrier seems to be having a positive FE/MPG effect. On my commutes, I'm seeing an apparent 2-3 MPG gain. On the stop, park, and go weekend errand runs, the gain may be as much as 5 MPG. In addition, I am seeing an apparent 5-10 degF higher coolant temps across the board. I am being intentionally fuzzy about the possible gains. What with driving safely and using hyper-mileing tactics, I haven't been able to record hard coolant temp data despite having a ScanGauge to read coolant temps and get trip and daily MPG numbers. I have made numerous runs over very familiar routes, and I am seeing both MPG numbers and coolant temps that are higher than I would have expected to see without the barrier. And that is about as good as I can do. I'd like to encourage others, not just Prius drivers, who have the more sophisticated monitoring gear and data recording capabilities -- or maybe it's just more patience than I have -- to give the barrier a try and get some good, hard numbers so it can be determned whether this is worth adding to the established list of cold weather thermal retention enhancements. |
No doubt it helps and should be added (even though I have no "numbers" to share).
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