2009 Hot Weather High RPMs?
#101
07-18-2009, 06:53 AM
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Re: 2009 Hot Weather High RPMs?
NO! This is completly false in the 2005 to 2008 models, the rear air door to the outside closes, and already cooled air is recirculated. I see no good reason why Ford would change this for 2009, but I have not personally inspected the 2009 which is largely, the same vehicle.
As for the freon line being not insulated, I don't think it matters.
The "cold" line is the return line going back to the compressor under the hood.
So no "coldness" is "wasted" going to the pack.
When freon is compressed, it is actually hot, not cold, and liquid.
The hot high pressure line goes into the pack's "evaporator" where the pressure is lowered, the liquid vaporizes, and the freon cools dramatically.
The cold line is vapor going back to be liquified again.
Insulation may add little effect, at additional cost.
As for the freon line being not insulated, I don't think it matters.
The "cold" line is the return line going back to the compressor under the hood.
So no "coldness" is "wasted" going to the pack.
When freon is compressed, it is actually hot, not cold, and liquid.
The hot high pressure line goes into the pack's "evaporator" where the pressure is lowered, the liquid vaporizes, and the freon cools dramatically.
The cold line is vapor going back to be liquified again.
Insulation may add little effect, at additional cost.
I think you may have just inadvertently stumbled over what has changed for 2009. If cabin air were used, and the driver were for some reason comfortable with no cabin A/C on a HOT day, how would the batteries be cooled....??
Perhaps for 2009 the battery compartment either takes in fresh or cools the cabin air AFTER it flows through the cabin. But then how would cabin A/C recirculate work...??
Last edited by wwest; 07-18-2009 at 06:56 AM.
#102
07-18-2009, 07:17 AM
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Re: 2009 Hot Weather High RPMs?
Recirculating cooled air within the battery compartment could lead to a very EXPLOSIVE situation.
I think you may have just inadvertently stumbled over what has changed for 2009. If cabin air were used, and the driver were for some reason comfortable with no cabin A/C on a HOT day, how would the batteries be cooled....??
Perhaps for 2009 the battery compartment either takes in fresh or cools the cabin air AFTER it flows through the cabin. But then how would cabin A/C recirculate work...??
I think you may have just inadvertently stumbled over what has changed for 2009. If cabin air were used, and the driver were for some reason comfortable with no cabin A/C on a HOT day, how would the batteries be cooled....??
Perhaps for 2009 the battery compartment either takes in fresh or cools the cabin air AFTER it flows through the cabin. But then how would cabin A/C recirculate work...??
Even when your cabin is on "Recirc" your car, any car, any make, is never "air tight". Willard, I must say, you should refrain from posting in this area. Your lack of understanding boggles the mind. Up until recently, only the Japanese cars use cabin air for cooling the battery pack... but those cars have smaller packs.
Last edited by gpsman1; 07-18-2009 at 10:22 AM.
#103
07-18-2009, 07:54 AM
Re: 2009 Hot Weather High RPMs?
"new smaller, lighter nickel-metal hydride battery has been optimized to produce 20 percent more power. Improved chemistry allows the battery to be run at a higher temperature and it is cooled using cabin air "
(ref:http://media.ford.com/images/10031/2...ion_Hybrid.pdf)
As for WWEST's statement, the 2005-2008 FEH battery can either use outside air or recirculated air (or possibly a mixture). There is a blend door that controls the air source (ref: known blend door motor issue that several owners on this site, including myself, have had replaced). I'm not sure why recirculating air would be a hazard. The batteries are sealed so unless there was a massive failure, there should be litle danger of explosion from gasses.
#104
07-18-2009, 10:16 AM
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Posts: 3,616
Re: 2009 Hot Weather High RPMs?
Yes, of course. Due to a major redesign and smaller size, the Ford Fusion / Mercury Milan hybrids are able to "get away with" cabin air cooling.
I wonder if we have any persons on here with a Ford MoCo. hybrid sedan who can get the scangauge to read the internal temperature of those packs.
I wonder if there is that good of cooling, or if they are just allowed to run hotter. I'm going to guess they draw fewer amps, so create less heat in the first place.
I wonder if we have any persons on here with a Ford MoCo. hybrid sedan who can get the scangauge to read the internal temperature of those packs.
I wonder if there is that good of cooling, or if they are just allowed to run hotter. I'm going to guess they draw fewer amps, so create less heat in the first place.
#105
07-18-2009, 11:34 AM
Re: 2009 Hot Weather High RPMs?
Who says that a cool pack is always better? Radio Control car racers use Ni-MH packs and want them still hot before using, either right off the charger or they also use a insulated pouch to keep them warm as possible. Some of their chargers have provisions for timing the finish of the charge to the heats of racing so the pack will be still hot.
#106
07-18-2009, 12:44 PM
Re: 2009 Hot Weather High RPMs?
Who says that a cool pack is always better? Radio Control car racers use Ni-MH packs and want them still hot before using, either right off the charger or they also use a insulated pouch to keep them warm as possible. Some of their chargers have provisions for timing the finish of the charge to the heats of racing so the pack will be still hot.
#107
07-18-2009, 01:11 PM
Re: 2009 Hot Weather High RPMs?
Lastly, are you making a sarcastic remark typical in GreenHybrid towards non-FEH owner or just being plain sarcastic?
#110
07-18-2009, 06:13 PM
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Join Date: Sep 2006
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Re: 2009 Hot Weather High RPMs?
No. The air IS recirculated, but the battery box is not air tight.
Recirculate would mean a duct to recapture, "salvage" the pre-cooled air within the battery case and route it back to the evaporator intake. I see no such arrangement for the 2009 Escape.
Any pressure or ( very unlikely gases ) are allowed to vent.
Plus, who says these battery cells produce enough gas to worry about?
Agreed, they do not normally vent gases. But you will NOT find a well designed battery, like an electrolytic capacitor, that does not have a pressure gas release built in. No matter how rare no one would wish those pressure vented gasses to end up in the passenger cabin.
They are nothing like the wet cell lead acid battery under the hood.
Even when your cabin is on "Recirc" your car, any car, any make, is never "air tight".
No, but lots of design headway has been made in the past few years to increase A/C efficiency by restricting cabin air outflow.
Willard, I must say, you should refrain from posting in this area. Your lack of understanding boggles the mind. Up until recently, only the Japanese cars use cabin air for cooling the battery pack... but those cars have smaller packs.
Recirculate would mean a duct to recapture, "salvage" the pre-cooled air within the battery case and route it back to the evaporator intake. I see no such arrangement for the 2009 Escape.
Any pressure or ( very unlikely gases ) are allowed to vent.
Plus, who says these battery cells produce enough gas to worry about?
Agreed, they do not normally vent gases. But you will NOT find a well designed battery, like an electrolytic capacitor, that does not have a pressure gas release built in. No matter how rare no one would wish those pressure vented gasses to end up in the passenger cabin.
They are nothing like the wet cell lead acid battery under the hood.
Even when your cabin is on "Recirc" your car, any car, any make, is never "air tight".
No, but lots of design headway has been made in the past few years to increase A/C efficiency by restricting cabin air outflow.
Willard, I must say, you should refrain from posting in this area. Your lack of understanding boggles the mind. Up until recently, only the Japanese cars use cabin air for cooling the battery pack... but those cars have smaller packs.
