1. Attachments are working again! Check out this thread for more details and to report any other bugs.

Efficient ventilation mode?

Discussion in 'Gen 4 Prius Technical Discussion' started by Jeppefinn, Apr 7, 2018.

Page 3 of 3
  1. Jeppefinn

    Jeppefinn Active Member

    Joined:
    Mar 31, 2018
    121
    138
    4
    Location:
    Espoo, Finland
    Vehicle:
    2016 Prius
    Model:
    Premium
    Yup, hard to explain if you've never experienced it.
    But at -5C for example the relative humidity outside does not matter one bit.
    If you drive around and someone in the car is breathing (the driver or one of the passengers ;)) the outside air always contains less water even if relative humidity outside is 100%.
     
    #41 Jeppefinn, Apr 15, 2018
    alanclarkeau likes this.
  2. alanclarkeau

    alanclarkeau Senior Member

    Joined:
    Feb 24, 2016
    7,044
    7,587
    0
    Location:
    near Brisbane, Australia
    Vehicle:
    2016 Prius
    Model:
    N/A
    So better to have driver and passengers like this:
    upload_2018-4-16_7-48-58.png
     
    #42 alanclarkeau, Apr 15, 2018
    jerrymildred, RCO and Jeppefinn like this.
  3. Prodigyplace

    Prodigyplace 2025 Camry XLE FWD

    Joined:
    Nov 1, 2016
    11,799
    11,362
    0
    Location:
    Central Virginia
    Vehicle:
    Other Hybrid
    Model:
    XLE
    We already have too many dummies driving here! :eek:
     
    #43 Prodigyplace, Apr 15, 2018
    jerrymildred, RCO and alanclarkeau like this.
  4. Tideland Prius

    Tideland Prius Moderator of the North
    Staff Member

    Joined:
    Oct 2, 2004
    45,024
    16,242
    41
    Location:
    Canada
    Vehicle:
    Other Non-Hybrid
    Model:
    N/A
    Yes.

    Note that the dewpoint will rise slightly with the added water vapour so the difference between the temperature and dewpoint will decrease not only when you decrease the temperature but also when you add water vapour.

    There's some sort of standard to reading the thermometer. I recall a white box with slats to allow airflow and shade; that's where the thermometer resides.

    I'm guessing a surface reading will be false since there could be extra heat from the pavement or soil during the day.
     
    #44 Tideland Prius, Apr 15, 2018
  5. Jeppefinn

    Jeppefinn Active Member

    Joined:
    Mar 31, 2018
    121
    138
    4
    Location:
    Espoo, Finland
    Vehicle:
    2016 Prius
    Model:
    Premium
    Those guys look awfully happy and suspiciously chatty, we finns like our peace and quiet while driving.
     
    #45 Jeppefinn, Apr 16, 2018
    alanclarkeau likes this.
  6. Jeppefinn

    Jeppefinn Active Member

    Joined:
    Mar 31, 2018
    121
    138
    4
    Location:
    Espoo, Finland
    Vehicle:
    2016 Prius
    Model:
    Premium
    Yes, I think I've seen those official boxes too somewhere too.
    It's a ventilated white box about human head height from the ground and there should be no large pavements or parking lots nearby.
     
    #46 Jeppefinn, Apr 16, 2018
    Last edited: Apr 16, 2018
    Tideland Prius likes this.
  7. Jeppefinn

    Jeppefinn Active Member

    Joined:
    Mar 31, 2018
    121
    138
    4
    Location:
    Espoo, Finland
    Vehicle:
    2016 Prius
    Model:
    Premium
    I'll make you a video at -20C next winter. I think tit akes only 2 minutes if you go sit in a cold car and after that all the windows are fogged up from the inside (could be even less). At +10 it I bet it takes 10-15 minutes.
    (although me being a mouthbreather might make it worse :D)

    Putting a pan with boiling water in the cold car might make a cool youtube video come to think of it.
     
    #47 Jeppefinn, Apr 16, 2018
    Last edited: Apr 16, 2018
    Tideland Prius likes this.
  8. alanclarkeau

    alanclarkeau Senior Member

    Joined:
    Feb 24, 2016
    7,044
    7,587
    0
    Location:
    near Brisbane, Australia
    Vehicle:
    2016 Prius
    Model:
    N/A
    Yes, a Stephenson Box or Screen - we mounted ours at 1.5metres high from memory, but can't remember if that was top or bottom - probably bottom - there was some leeway in the standard.
    upload_2018-4-16_19-8-6.png
     
    #48 alanclarkeau, Apr 16, 2018
    Tideland Prius and RCO like this.
  9. RCO

    RCO Senior Member

    Joined:
    Aug 31, 2016
    3,709
    5,184
    0
    Location:
    Cornwall
    Vehicle:
    Other Hybrid
    Model:
    N/A
    You're right, and I see Alan has already enlightened you. I won't bore you with the details, but the UK Met. Office has set Max/Min measurements for height above ground and distance clear of buildings an other obstructions. In case you're wondering, meteorology and basic forecasting are part of an air traffic controllers'training curriculum. In my day, you even had to receive & send in Morse code, but I don't suppose that's as necessary the days.
     
    #49 RCO, Apr 16, 2018
    Tideland Prius likes this.
  10. alanclarkeau

    alanclarkeau Senior Member

    Joined:
    Feb 24, 2016
    7,044
    7,587
    0
    Location:
    near Brisbane, Australia
    Vehicle:
    2016 Prius
    Model:
    N/A
    Morse Code was required for an Amateur (Ham) Radio licence till only about 15 yrs ago, though some countries were more recent - some may still require it.
     
    #50 alanclarkeau, Apr 16, 2018
    RCO likes this.
  11. Tideland Prius

    Tideland Prius Moderator of the North
    Staff Member

    Joined:
    Oct 2, 2004
    45,024
    16,242
    41
    Location:
    Canada
    Vehicle:
    Other Non-Hybrid
    Model:
    N/A
    No need. At -40, the top left part of my windshield never defrosted even though the climate control was set to the front defroster. I eventually accept that and went back to AUTO. This is in my Gen 3.

    Yes, that's what it's called! lol.
     
    #51 Tideland Prius, Apr 16, 2018
    alanclarkeau likes this.
(You must log in or sign up to post here.)
Page 3 of 3