Author Topic: dramatically improve the davis 7714 solar shield  (Read 8617 times)

0 Members and 1 Guest are viewing this topic.

Offline giusCB

  • www.turismometeo.it
  • Forecaster
  • *****
  • Posts: 406
    • TurismoMeteo OdV Webcam Streaming and Weather Stations live
dramatically improve the davis 7714 solar shield
« on: August 27, 2022, 04:42:52 AM »
thanks to Ivano from Italy , he has made this mod to the 7714
 [ You are not allowed to view attachments ]
the first data are extremely promising, very close and sometimes better than the two barani screens which cost almost three times the price of davis.
This mod. could help many users to save money and still obtain excellent quality data
premise:
all sensors are the same and aligned with each other (ecowitt wh-ep with sht35)
all screens are in the same location and at the same height

Follow data here: https://www.ecowitt.net/home/index?id=21281#
and here: https://www.wxforum.net/index.php?topic=39934.msg450718#msg450718
www.turismometeo.it
Webcam and Weather Stations live network from Italy

Offline giusCB

  • www.turismometeo.it
  • Forecaster
  • *****
  • Posts: 406
    • TurismoMeteo OdV Webcam Streaming and Weather Stations live
Re: dramatically improve the davis 7714 solar shield
« Reply #1 on: August 27, 2022, 04:50:04 AM »
example  :shock:  [ You are not allowed to view attachments ]
www.turismometeo.it
Webcam and Weather Stations live network from Italy

Offline giusCB

  • www.turismometeo.it
  • Forecaster
  • *****
  • Posts: 406
    • TurismoMeteo OdV Webcam Streaming and Weather Stations live
www.turismometeo.it
Webcam and Weather Stations live network from Italy

Offline kobuki

  • Forecaster
  • *****
  • Posts: 838
Re: dramatically improve the davis 7714 solar shield
« Reply #3 on: August 28, 2022, 12:06:50 PM »
What did the Italian gentleman do exactly? Painted the underside of the segments black? What kind of paint did he use? Is there a description of his work, even in Italian?

Offline ivano

  • Senior Contributor
  • ****
  • Posts: 280
    • http://www.supermeteo.com/stazione/ortelle/
Re: dramatically improve the davis 7714 solar shield
« Reply #4 on: August 30, 2022, 05:36:13 AM »
Good morning to all data of yesterday 08/29/2022
 [ You are not allowed to view attachments ]
yesterday with a lot of instability, but these days are also needed to see the behavior of davis black, and all in all it went just fine ;)
1)3 gw1000 +1 GW2000
2)hp2551
3)ws80
4)ws68
5)2 wh32 EP
6)5 wh31 EP
7)2 meteoschield pro 3 gen
8)1 Fars meteoshield pro 3 gen
9) davis 7714 Black
10)wh40
11)schermo solare RAD-14 Metspec
12)schermo solare RAD-02 Metspec
13)Meteorain 200 compact (Barani)
14)davis ventilato h24
15) Davis vp2 pro ventilata
16) GW1001 ecowitt
17) Wittboy ecowitt
18)schermo solare  Comet system da Cometeo
template http://ortellemeteo.altervista.org/pwsd/
webcam :https://rtsp.me/embed/tRhazi3z/
http://www.supermeteo.com/stazione/ortelle/

Offline ivano

  • Senior Contributor
  • ****
  • Posts: 280
    • http://www.supermeteo.com/stazione/ortelle/
Re: dramatically improve the davis 7714 solar shield
« Reply #5 on: August 30, 2022, 05:44:53 AM »
What did the Italian gentleman do exactly? Painted the underside of the segments black? What kind of paint did he use? Is there a description of his work, even in Italian?
hi, I am doing the test, to paint the interior I used a polyurethane-based matte black, soon I will publish a guide that shows the various steps, which are very simple  [tup]
1)3 gw1000 +1 GW2000
2)hp2551
3)ws80
4)ws68
5)2 wh32 EP
6)5 wh31 EP
7)2 meteoschield pro 3 gen
8)1 Fars meteoshield pro 3 gen
9) davis 7714 Black
10)wh40
11)schermo solare RAD-14 Metspec
12)schermo solare RAD-02 Metspec
13)Meteorain 200 compact (Barani)
14)davis ventilato h24
15) Davis vp2 pro ventilata
16) GW1001 ecowitt
17) Wittboy ecowitt
18)schermo solare  Comet system da Cometeo
template http://ortellemeteo.altervista.org/pwsd/
webcam :https://rtsp.me/embed/tRhazi3z/
http://www.supermeteo.com/stazione/ortelle/

Offline DoctorKnow

  • Forecaster
  • *****
  • Posts: 1975
Re: dramatically improve the davis 7714 solar shield
« Reply #6 on: August 30, 2022, 12:45:24 PM »
Excellent. The black absorbs the heat away from the sensor.

Offline SoMDWx

  • Forecaster
  • *****
  • Posts: 1014
    • Southern Maryland Weather
Re: dramatically improve the davis 7714 solar shield
« Reply #7 on: August 30, 2022, 12:48:14 PM »
I think this would actually add heat to the overall structure of the shield and thus possibly raise the sensor temps..... There's a reason they are painter white...

Offline ivano

  • Senior Contributor
  • ****
  • Posts: 280
    • http://www.supermeteo.com/stazione/ortelle/
Re: dramatically improve the davis 7714 solar shield
« Reply #8 on: August 30, 2022, 12:52:33 PM »
I think this would actually add heat to the overall structure of the shield and thus possibly raise the sensor temps..... There's a reason they are painter white...
sorry, but have you seen the graphs I posted above? have you ever seen a davis 7714 go as a meteoshield pro?
1)3 gw1000 +1 GW2000
2)hp2551
3)ws80
4)ws68
5)2 wh32 EP
6)5 wh31 EP
7)2 meteoschield pro 3 gen
8)1 Fars meteoshield pro 3 gen
9) davis 7714 Black
10)wh40
11)schermo solare RAD-14 Metspec
12)schermo solare RAD-02 Metspec
13)Meteorain 200 compact (Barani)
14)davis ventilato h24
15) Davis vp2 pro ventilata
16) GW1001 ecowitt
17) Wittboy ecowitt
18)schermo solare  Comet system da Cometeo
template http://ortellemeteo.altervista.org/pwsd/
webcam :https://rtsp.me/embed/tRhazi3z/
http://www.supermeteo.com/stazione/ortelle/

Offline SoMDWx

  • Forecaster
  • *****
  • Posts: 1014
    • Southern Maryland Weather
Re: dramatically improve the davis 7714 solar shield
« Reply #9 on: August 30, 2022, 12:59:50 PM »
And have you seen just about every Stevenson shield and FARS unit (amateur and professionally built) painted white or a very light color? There's a reason.....

Offline ivano

  • Senior Contributor
  • ****
  • Posts: 280
    • http://www.supermeteo.com/stazione/ortelle/
Re: dramatically improve the davis 7714 solar shield
« Reply #10 on: August 30, 2022, 01:19:24 PM »
And have you seen just about every Stevenson shield and FARS unit (amateur and professionally built) painted white or a very light color? There's a reason.....
all the high-end professional screens are black inside, then I repeat the graphs shown above are real data, recorded in the station, the weather huts do not have to compare them to a sunscreen is a whole other story,
1)3 gw1000 +1 GW2000
2)hp2551
3)ws80
4)ws68
5)2 wh32 EP
6)5 wh31 EP
7)2 meteoschield pro 3 gen
8)1 Fars meteoshield pro 3 gen
9) davis 7714 Black
10)wh40
11)schermo solare RAD-14 Metspec
12)schermo solare RAD-02 Metspec
13)Meteorain 200 compact (Barani)
14)davis ventilato h24
15) Davis vp2 pro ventilata
16) GW1001 ecowitt
17) Wittboy ecowitt
18)schermo solare  Comet system da Cometeo
template http://ortellemeteo.altervista.org/pwsd/
webcam :https://rtsp.me/embed/tRhazi3z/
http://www.supermeteo.com/stazione/ortelle/

Offline SoMDWx

  • Forecaster
  • *****
  • Posts: 1014
    • Southern Maryland Weather
Re: dramatically improve the davis 7714 solar shield
« Reply #11 on: August 30, 2022, 01:34:12 PM »

Offline ivano

  • Senior Contributor
  • ****
  • Posts: 280
    • http://www.supermeteo.com/stazione/ortelle/
Re: dramatically improve the davis 7714 solar shield
« Reply #12 on: August 30, 2022, 01:39:52 PM »
I direct you to this:

https://allmeteo.com/maximum-radiation-shield-error
uhmm ... you're getting confused, the inside of the screen is colored black not the outside :) in fact the meteoshield pro inside is black, not white, will there be a why?
1)3 gw1000 +1 GW2000
2)hp2551
3)ws80
4)ws68
5)2 wh32 EP
6)5 wh31 EP
7)2 meteoschield pro 3 gen
8)1 Fars meteoshield pro 3 gen
9) davis 7714 Black
10)wh40
11)schermo solare RAD-14 Metspec
12)schermo solare RAD-02 Metspec
13)Meteorain 200 compact (Barani)
14)davis ventilato h24
15) Davis vp2 pro ventilata
16) GW1001 ecowitt
17) Wittboy ecowitt
18)schermo solare  Comet system da Cometeo
template http://ortellemeteo.altervista.org/pwsd/
webcam :https://rtsp.me/embed/tRhazi3z/
http://www.supermeteo.com/stazione/ortelle/

Offline SoMDWx

  • Forecaster
  • *****
  • Posts: 1014
    • Southern Maryland Weather
Re: dramatically improve the davis 7714 solar shield
« Reply #13 on: August 30, 2022, 02:24:44 PM »
Uh no.. If you look at the two photos, the white one is white both inside and out where the "black" one is black in and out...

Please see the graph for comparison...

Offline ivano

  • Senior Contributor
  • ****
  • Posts: 280
    • http://www.supermeteo.com/stazione/ortelle/
Re: dramatically improve the davis 7714 solar shield
« Reply #14 on: August 30, 2022, 03:00:29 PM »
look, I 3 meteoshield pro 2 second generation and 1 third generation which is not for sale yet, but I'm testing it, so I know these screens perfectly
 [ You are not allowed to view attachments ]  [ You are not allowed to view attachments ]  you will notice from the photo that they are black inside, not outside, the davis 7714 of the above test compares with the third generation meteoshield pro, it is a test so you have to evaluate if the black colored davis inside produces benefits, or not , from these first days it seems that it is going very well, it is still too early to make judgments, but the first impressions are encouraging, the theory is fine, but up to a certain point, ;)
1)3 gw1000 +1 GW2000
2)hp2551
3)ws80
4)ws68
5)2 wh32 EP
6)5 wh31 EP
7)2 meteoschield pro 3 gen
8)1 Fars meteoshield pro 3 gen
9) davis 7714 Black
10)wh40
11)schermo solare RAD-14 Metspec
12)schermo solare RAD-02 Metspec
13)Meteorain 200 compact (Barani)
14)davis ventilato h24
15) Davis vp2 pro ventilata
16) GW1001 ecowitt
17) Wittboy ecowitt
18)schermo solare  Comet system da Cometeo
template http://ortellemeteo.altervista.org/pwsd/
webcam :https://rtsp.me/embed/tRhazi3z/
http://www.supermeteo.com/stazione/ortelle/

Offline kobuki

  • Forecaster
  • *****
  • Posts: 838
Re: dramatically improve the davis 7714 solar shield
« Reply #15 on: August 30, 2022, 03:03:12 PM »
This might not be a completely fair comparison to the solution presented by OP. Allmeteo uses their proprietary, patented tech that apparently helps a great deal when dealing with low or no winds and strong sunlight. Dark paint absorbs more heat energy but at the same time it prevents light bounce inside the screen. So, there are multiple aspects of the same method. It's not simply black or white :)

Offline giusCB

  • www.turismometeo.it
  • Forecaster
  • *****
  • Posts: 406
    • TurismoMeteo OdV Webcam Streaming and Weather Stations live
Re: dramatically improve the davis 7714 solar shield
« Reply #16 on: August 30, 2022, 03:23:47 PM »
This might not be a completely fair comparison to the solution presented by OP. Allmeteo uses their proprietary, patented tech that apparently helps a great deal when dealing with low or no winds and strong sunlight. Dark paint absorbs more heat energy but at the same time it prevents light bounce inside the screen. So, there are multiple aspects of the same method. It's not simply black or white :)
can you explain better this ??
www.turismometeo.it
Webcam and Weather Stations live network from Italy

Offline kobuki

  • Forecaster
  • *****
  • Posts: 838
Re: dramatically improve the davis 7714 solar shield
« Reply #17 on: August 30, 2022, 03:27:17 PM »
What is there to explain? Absorbed light doesn't bounce. Bounced light would directly heat up parts inside the screen. Absorbed light heats up the screen itself and that heat radiates to all directions and is being transferred away slowly to the surrounding air by convection.

Offline ivano

  • Senior Contributor
  • ****
  • Posts: 280
    • http://www.supermeteo.com/stazione/ortelle/
Re: dramatically improve the davis 7714 solar shield
« Reply #18 on: August 30, 2022, 03:40:42 PM »
What is there to explain? Absorbed light doesn't bounce. Bounced light would directly heat up parts inside the screen. Absorbed light heats up the screen itself and that heat radiates to all directions and is being transferred away slowly to the surrounding air by convection.
the sun does not hit the inside of the dishes, the reflected radiation cannot overheat the inside of the dishes, the black only serves to absorb the radiation, then sorry if the best solar screens are black inside, there will be a why? if the davis went from 0.6 / 07 tenths above the meteoshield pro to be even after the change, has something changed?
 [ You are not allowed to view attachments ]  [ You are not allowed to view attachments ]  
1)3 gw1000 +1 GW2000
2)hp2551
3)ws80
4)ws68
5)2 wh32 EP
6)5 wh31 EP
7)2 meteoschield pro 3 gen
8)1 Fars meteoshield pro 3 gen
9) davis 7714 Black
10)wh40
11)schermo solare RAD-14 Metspec
12)schermo solare RAD-02 Metspec
13)Meteorain 200 compact (Barani)
14)davis ventilato h24
15) Davis vp2 pro ventilata
16) GW1001 ecowitt
17) Wittboy ecowitt
18)schermo solare  Comet system da Cometeo
template http://ortellemeteo.altervista.org/pwsd/
webcam :https://rtsp.me/embed/tRhazi3z/
http://www.supermeteo.com/stazione/ortelle/

Offline kobuki

  • Forecaster
  • *****
  • Posts: 838
Re: dramatically improve the davis 7714 solar shield
« Reply #19 on: August 30, 2022, 03:46:17 PM »
Please read my post again, slowly, carefully. This is basic physics. I did not make any claim about any screens. These basic phenomena exist and influence the micro-climate inside the screen. Using black paint on the insides of the screens is a very old and effective method for neutralizing some of the heat related problems with measurements. This is nothing new, I also have a screen painted similarly (currently out of use, its mounting broke).

Offline ivano

  • Senior Contributor
  • ****
  • Posts: 280
    • http://www.supermeteo.com/stazione/ortelle/
Re: dramatically improve the davis 7714 solar shield
« Reply #20 on: August 30, 2022, 03:58:34 PM »
I understand, but the post tries to establish if taking a standard davis 7714 and coloring the inside of the plates in matte black, does it bring any improvements? or makes the situation worse? or nothing changes? then the theory the physics ok, but in reality what happens? that's all, to understand something the only possibility is to make a comparison between the davis and a reference screen,
1)3 gw1000 +1 GW2000
2)hp2551
3)ws80
4)ws68
5)2 wh32 EP
6)5 wh31 EP
7)2 meteoschield pro 3 gen
8)1 Fars meteoshield pro 3 gen
9) davis 7714 Black
10)wh40
11)schermo solare RAD-14 Metspec
12)schermo solare RAD-02 Metspec
13)Meteorain 200 compact (Barani)
14)davis ventilato h24
15) Davis vp2 pro ventilata
16) GW1001 ecowitt
17) Wittboy ecowitt
18)schermo solare  Comet system da Cometeo
template http://ortellemeteo.altervista.org/pwsd/
webcam :https://rtsp.me/embed/tRhazi3z/
http://www.supermeteo.com/stazione/ortelle/

Offline CW2274

  • Forecaster
  • *****
  • Posts: 6708
    • Conditions @ CW2274 West Tucson-Painted Hills Ranch
Re: dramatically improve the davis 7714 solar shield
« Reply #21 on: August 30, 2022, 05:46:12 PM »
Take it for what it's worth, but the inside of the 24hr VP2 shield (which is patented), has a black disc at the bottom of the sensor chamber. I think it's safe to say this isn't just because, but serves a purpose, and it's aspirated, so it's not just for passive performance.

Offline ivano

  • Senior Contributor
  • ****
  • Posts: 280
    • http://www.supermeteo.com/stazione/ortelle/
Re: dramatically improve the davis 7714 solar shield
« Reply #22 on: August 31, 2022, 04:51:24 AM »
Hello everyone, davis black test yesterday 30/08/2022 still very good  [ You are not allowed to view attachments ]   [tup]
1)3 gw1000 +1 GW2000
2)hp2551
3)ws80
4)ws68
5)2 wh32 EP
6)5 wh31 EP
7)2 meteoschield pro 3 gen
8)1 Fars meteoshield pro 3 gen
9) davis 7714 Black
10)wh40
11)schermo solare RAD-14 Metspec
12)schermo solare RAD-02 Metspec
13)Meteorain 200 compact (Barani)
14)davis ventilato h24
15) Davis vp2 pro ventilata
16) GW1001 ecowitt
17) Wittboy ecowitt
18)schermo solare  Comet system da Cometeo
template http://ortellemeteo.altervista.org/pwsd/
webcam :https://rtsp.me/embed/tRhazi3z/
http://www.supermeteo.com/stazione/ortelle/

Offline kobuki

  • Forecaster
  • *****
  • Posts: 838
Re: dramatically improve the davis 7714 solar shield
« Reply #23 on: August 31, 2022, 05:01:21 AM »
I'm wondering how a fan-aspirated temperature sensor would fare besides the tested devices. As I understand, these are all passively ventilated.

Offline ivano

  • Senior Contributor
  • ****
  • Posts: 280
    • http://www.supermeteo.com/stazione/ortelle/
Re: dramatically improve the davis 7714 solar shield
« Reply #24 on: August 31, 2022, 07:58:15 AM »
I'm wondering how a fan-aspirated temperature sensor would fare besides the tested devices. As I understand, these are all passively ventilated.

oh my, the comparison with a ventilated screen is not always feasible, if the wind exceeds 10 km / h the ventilated loses its effectiveness, in the absence of wind or with very weak wind below 5 km / h it is unsurpassed
 [ You are not allowed to view attachments ]
1)3 gw1000 +1 GW2000
2)hp2551
3)ws80
4)ws68
5)2 wh32 EP
6)5 wh31 EP
7)2 meteoschield pro 3 gen
8)1 Fars meteoshield pro 3 gen
9) davis 7714 Black
10)wh40
11)schermo solare RAD-14 Metspec
12)schermo solare RAD-02 Metspec
13)Meteorain 200 compact (Barani)
14)davis ventilato h24
15) Davis vp2 pro ventilata
16) GW1001 ecowitt
17) Wittboy ecowitt
18)schermo solare  Comet system da Cometeo
template http://ortellemeteo.altervista.org/pwsd/
webcam :https://rtsp.me/embed/tRhazi3z/
http://www.supermeteo.com/stazione/ortelle/

 

anything