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Large Area Of Roof Glass Concern

Discussion in 'Design' started by Larry Bond, Aug 21, 2017.

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  1. Larry Bond

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    I remember the AMC Pacer that sold in the late 70's. It had so much glass they eventually had to give away air conditioning to sell it. Does anyone else have a concern with the Tesla 3's extensive amount of glass? To me it seems like it would be a greenhouse for trapping heat. Do they address this issue?
     
  2. MelindaV

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    Tesla uses glass with both VU and IR blockers in it, plus tinted black. It's no 1970s Pacer
    Go sit in a Model S with a glass roof and see if you think it's an issue. people in hot areas don't think so.
     
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    • SoFlaModel3

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      I agree with @MelindaV there is nothing to worry about here.

      Worst case you buy the fixed shade.

      That said you'll pre-cool the car and it will be the coldest car you've ever entered in a warm climate :)
       
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      • M3MD

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        I had this concern too, so I went on a test drive in a Model S in Las Vegas at the hottest time of the day... result: it's completely a non-issue!
        I was sold immediately. I live in Seattle area where 119 degree sunshine doesn't happen, so I'm even more comfortable with having the all glass roof now.
         
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        • Mark C

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          #5 Mark C, Sep 14, 2017
          Last edited: Sep 14, 2017
          I hate sunroof cars for all the blistering heat on my head. I test drove a Model S with the full glass roof / sunroof on a sunny day, just to see if all the hype was true. As soon as I started driving, I forgot the roof was glass. Didn't notice anything at all, then the wife got in the front seat and I got in the back. She asked the Tesla rep how to open the sunroof. When he opened it, I was amazed at the blazing heat that immediately hit me.

          I now plan to buy the all glass roof, if at all possible. It's one of those, "I GOTTA GET ME ONE OF THESE:D" items now.
           
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          • SSonnentag

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            It's amazing how they can fit the entire country of Vanuatu in that glass. ;)
             
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            • OneSixtyToOne

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              When the Pacer came out a friend of mine said he would never buy one because it would be impossible to smoke a joint in that car and not be seen.
               
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              • MelindaV

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                well, that's really a concern any more - at least west coast...
                 
              • arnis

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                Heat buildup will not be an issue. If you live in a really sunny climate, consider light exterior
                and interior color. White will be ideal, red and light gray are fine, others are same as black.

                What will be a slight disadvantage is heat loss. Single-layer glass is not a good insulator. Even though cars
                have a lot of glass all around, Model 3 has even more. Heat loss in cabin means more heating
                draw in cold weather. I upgraded my BMW with dual layer windows (doors) and it's night and day.
                Imagine warm glass surface, just like dual/triple layer glass at home.
                 
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                • JWardell

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                  Sheet metal is not a good insulator either :)
                   
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                  • arnis

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                    #11 arnis, Sep 17, 2017 at 1:31 PM
                    Last edited: Sep 18, 2017 at 6:13 AM
                    Where do you see metal surfaces on vehicles as expensive as M3 or 3-series (interior) :D

                    EDIT: I know thermodynamics is not the easiest topic but it can be simplified.
                    It's not the two/three layers of glass that insulates on windows. It's the gap between.
                    This is why high quality windows have Argon filling (less heat transfer compared to air)
                    Same story with cars. Most surfaces are covered with interior panels.
                    Roof liner on the roof. On BMW, there is actually cardboard glued to the metal for sound and heat insulation.
                    And then there is alcantara (or whatever option). Same with engine bays. There is a sound+heat insulation mat fixed to the hood. Funny fact, Nissan Leaf came with that mat in 2011-12. Then they noticed that it was slight "oops" and removed it.
                    With glass roof, there is nothing. Bjorn have mentioned "cold chill" on the shoulders. Single layer glass surface is cold to touch, therefore it chills the air touching it. Alcantara roof is not cold to touch. Therefore it doesn't chill the air. But air between metal roof and roof liner is cold. Very cold. I've measured it.
                     
                  • NRG4All

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                    I know it has Infrared blockers but I've also read where an owner put his hand on the glass in direct sunlight and the glass was hot. For convected heat, that is not a problem because that heat only rises and is at the top of the ceiling. However, if it is hot then there has to be radiated heat. No matter the temperature of the air, radiated heat can account for as much as 40% of the comfort level. The opposite can be observed if you go into a cave during summer. Even though the air temperature is comfortable the cool walls will absorb your radiated heat and not reflect it back to you so you feel cool even though the air temperature would indicate otherwise. But then I have not sat in a roof with those blockers, maybe the roof remains cool to the touch in sunlight. I guess I'll find out shortly because don't all of the first production models come with the glass roof?
                     
                  • SoFlaModel3

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                    Yes, but there is no need to wait. Model S/X have the same glass. Go test drive one and check it out!
                     
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                    • danzgator

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                      I live in HOT Florida and have an MS with a panoramic roof. It's really a non-issue. I tinted all the windows with ceramic due to the amount heat that came through the glass, even the front windshield, but I DID NOT tint the pano roof. Zero heat comes through the roof glass.
                       
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                      • Mark C

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                        Just ask anyone who lives in a sheetmetal box, aka Mobile Homes
                         
                      • Brokedoc

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                        It really should not be a problem but everyone is unique. If you are EXTRA sensitive once you have your car, you can always buy:

                        Model 3 Front Glass Roof Sunshade

                        1135832-00-A_0.jpg
                         

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