Kochusan
Member
- First Name
- David
- Joined
- Mar 22, 2022
- Threads
- 2
- Messages
- 16
- Reaction score
- 8
- Location
- Sacramento
- Vehicles
- Honda Accord
Alternative - what about applying either white or other light colored body wrap film to the two windows? I'm here in the Sacramento Valley literally baking in a solar oven. Yesterday, we broke a lot of records and I had the R1S parked outside. I have the clip in sunshades - the ones with the reflective exterior which blocks 100% of the sun. The amount of heat still radiating above my head is frustrating through this shade. There is a layer of superheated air between the shade and roof glass and we can feel heat radiating downwards into the cabin.
As a starting point we have full ceramic tint on all the side glass - Llumar.
Tried an experiment yesterday to validate my top of head heat sensation...
Placed a flat thin dark (my hair is black and partly gray) cushion on the center console horizontally, out of the sun between the front seats facing the roof sunshade. Test took 3 hours 1 hour per trial truck driven and cooled between trials. Truck windshield pointed due north per the dash display. Ambient temperature about 109 to 113F.
A) Left the closed truck parked outside for one hour in full sun with the shades in place cushion temperature was 131 F. Upper shade surface temperature 141.
B) Removed sunshade, let the sun stream in on the seats and console pad temperature 137 F.
C) Placed a light-colored blanket on the outside of the roof over the glass 121 F.
Potential confounding factors:
1. Incident angle of light between trial A & C moved a bit from passenger biased to driver side biased but no more than 15 degrees.
2. Cooling cabin between trials - checked only as being "comfortable" to passengers and underlying console surface temperature (Ocean Coast) to 80 F with AC blasting.
3. Initial test A may be biased cooler as interior materials had best cool soak from long drive before test.
4. I tried to limit blanket coverage in trial #3 to the glass only but did cover the strip between the front and rear glass.
Findings:
1. Blocking visible light and infrared before the roof glass - like a real roof insulates best.
2. Re-radiation of infrared from either roof or sunshade is similar - validates the finding of some that tinting the roof doesn't have a significant subjective effect.
3. Cooling a hot truck down takes a while with the compressor roaring and takes a lot of energy! This experiment ran my battery down 13%.
Hypotheses:
1. The sunshade, despite blocking all the visible light, re-radiated infrared into the cabin from a layer of superheated air between the reflective fabric and roof glass. Noticeably reduces interior surface heating which likely accounts for the 4 F delta but not much better than the stock glass roof with Ocean Coast interior. Black or green interior may have different results.
2. The glass roof rejects transmission infrared and visible light well but the mass of glass itself heats up substantially and radiates a lot of heat into the cabin (my head feels hot like sitting in front of a wood stove).
3. Blocking light before it strikes and heats the mass of roof glass substantially lowers radiant heat into the cabin and also blocks interior surface heating - simulating a real roof closely.
Therefore, I'm thinking of using either white or yellow PPF wrap on the glass exterior to block heat. I believe there was another person who did this with a large perforated sticker. Anyone see any problems with this approach? I'm really tired of baking in the summer heat!
As a starting point we have full ceramic tint on all the side glass - Llumar.
Tried an experiment yesterday to validate my top of head heat sensation...
Placed a flat thin dark (my hair is black and partly gray) cushion on the center console horizontally, out of the sun between the front seats facing the roof sunshade. Test took 3 hours 1 hour per trial truck driven and cooled between trials. Truck windshield pointed due north per the dash display. Ambient temperature about 109 to 113F.
A) Left the closed truck parked outside for one hour in full sun with the shades in place cushion temperature was 131 F. Upper shade surface temperature 141.
B) Removed sunshade, let the sun stream in on the seats and console pad temperature 137 F.
C) Placed a light-colored blanket on the outside of the roof over the glass 121 F.
Potential confounding factors:
1. Incident angle of light between trial A & C moved a bit from passenger biased to driver side biased but no more than 15 degrees.
2. Cooling cabin between trials - checked only as being "comfortable" to passengers and underlying console surface temperature (Ocean Coast) to 80 F with AC blasting.
3. Initial test A may be biased cooler as interior materials had best cool soak from long drive before test.
4. I tried to limit blanket coverage in trial #3 to the glass only but did cover the strip between the front and rear glass.
Findings:
1. Blocking visible light and infrared before the roof glass - like a real roof insulates best.
2. Re-radiation of infrared from either roof or sunshade is similar - validates the finding of some that tinting the roof doesn't have a significant subjective effect.
3. Cooling a hot truck down takes a while with the compressor roaring and takes a lot of energy! This experiment ran my battery down 13%.
Hypotheses:
1. The sunshade, despite blocking all the visible light, re-radiated infrared into the cabin from a layer of superheated air between the reflective fabric and roof glass. Noticeably reduces interior surface heating which likely accounts for the 4 F delta but not much better than the stock glass roof with Ocean Coast interior. Black or green interior may have different results.
2. The glass roof rejects transmission infrared and visible light well but the mass of glass itself heats up substantially and radiates a lot of heat into the cabin (my head feels hot like sitting in front of a wood stove).
3. Blocking light before it strikes and heats the mass of roof glass substantially lowers radiant heat into the cabin and also blocks interior surface heating - simulating a real roof closely.
Therefore, I'm thinking of using either white or yellow PPF wrap on the glass exterior to block heat. I believe there was another person who did this with a large perforated sticker. Anyone see any problems with this approach? I'm really tired of baking in the summer heat!
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