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Pidou

Sujet du message: Re: About reports...

Publié: Dim Nov 16, 2008 10:47 am

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Inscription : Dim Juil 27, 2008 6:06 pm
Message(s) : 478

Hi,

That's the explanation found in the WeatherLink doc :

Citer:

Data: Heating & Cooling Degree-Days

Although degree-days are most commonly used in agriculture, they are also useful in building design and construction, and in fuel use evaluation. The construction industry uses heating degree-days to calculate the amount of heat necessary to keep a building, be it a house or a skyscraper, comfortable for occupation. Likewise, cooling degree-days are used to estimate the amount of heat that must be removed (through air-conditioning) to keep a structure comfortable. Heating and cooling degree-days are based on departures from a base temperature, typically 65ºF (18ºC).

One heating degree–day is the amount of heat required to keep a structure at 65ºF when the outside temperature remains one degree below the 65ºF threshold for 24 hours. One heating degree–day is also the amount of heat required to keep that structure at 65ºF when the temperature remains 24ºF below that 65º threshold for 1 hour.

Likewise, one cooling degree–day is the amount of cooling required to keep a structure at 65ºF when the outside temperature remains one degree above the 65ºF threshold for 24 hours. One cooling degree–day is also the amount of cooling required to keep that structure at 65ºF when the temperature remains 24ºF above that 65º threshold for 1 hour.

Depending on the calculation method, both heating and cooling degree-days can accumulate in the same day. Also, note that there are no negative degree-days. If the temperature remains below the threshold, there is no degree-day accumulation.

Heating and Cooling degree-days may be calculated by either the High/Low method or the Integration method.

Data: Degree-Day Calculation Methods
High / Low method

If you select the high/low method, the software uses the highest temperature and the lowest temperature for a given day to calculate the average temperature for that day. The difference between the average temperature and the base threshold are assumed to be the number of degree-days accumulated on that day. For example, if the average of the highest and lowest temperatures is 24º above the base threshold, the software assumes 24 degree–days for the entire day.

Note: Unless 15 hours worth of records exist in the database for that day (from midnight to 3pm, for example), the software will not calculate degree-days for that day.

Integration method

If you select the integration method, the software calculates degree–days using the average temperature for an interval and the interval time. For example, if the average temperature during a 15 minute interval was 24º above the base threshold, the software would calculate 0.25 degree-days during that interval (24 * 15 minutes in interval/1440 minutes per day). The number of degree-days during each interval are added together to arrive at a degree-day total. This method calculates degree-day totals more accurately than the high/low method.

I hope it will help, because it begins to sound Japanese for me :lol:

_________________
Ma station => http://www.meteo-boisney.fr

--- Station Vantage Pro 2 - Plugin VantagePro.dll ---
--- GraphWeather Version 2.0.312b ---

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jturlier

Sujet du message: Re: About reports...

Publié: Dim Nov 16, 2008 2:17 pm

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Inscription : Mar Août 22, 2006 8:38 am
Message(s) : 3145
Localisation : 34410 Sérignan - Languedoc

Hi Pidou,
Thank you for information. It may sound japanese for you but I think that it's much closer to chinese.
Now stop kidding.
As far as I understand, you have 2 methods to calculate :
One takes the average between daily max and daily min, above 65 it's cooling deg days, below it's heating. With this method, the complete day is either heating or cooling.
The second method accumulates each measurement below 65 for a predefined period of time (usualy difference between 2 successive records) the result being heating and same thing above 65 for cooling. In this case, you're going to have both heating and cooling deg days for the same day. It sounds closer to real life : When too hot one day you've to cool, if cold for the same day you've to heat : these are typical conditions for growing vegetables in a greenhouse.
This second method seems to be the one used by WeatherLink.
Does it sound more english now ?

Jean

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TiToine

Sujet du message: Re: About reports...

Publié: Dim Nov 16, 2008 2:27 pm

Site Admin

Inscription : Lun Mars 20, 2006 11:16 am
Message(s) : 3356
Localisation : Montréal

Pidou, is it possible to change the method in Weather Link?

It would be nice to provide me the data for one day of september 08 to ensure the integration method works as expected.

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Pidou

Sujet du message: Re: About reports...

Publié: Dim Nov 16, 2008 3:15 pm

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Inscription : Dim Juil 27, 2008 6:06 pm
Message(s) : 478

Hi Jean and Antoine,

Yes the explanation seems clearer.
In WeatherLink, you can configure :
- The "Cooling degree Day Base Temp."
- The "Heating degree Day Base Temp."
- The Calculation method.

My config is :
- 18,3 °C
- 18,3 °C
- Integration method.

You can check the record of November 08 here => http://www.meteo-boisney.fr/NOAA/NOAAMO.TXT
and the full records for 14/11/08 here => http://www.meteo-boisney.fr/NOAA/14-11-08.zip (file quite big !)

_________________
Ma station => http://www.meteo-boisney.fr

--- Station Vantage Pro 2 - Plugin VantagePro.dll ---
--- GraphWeather Version 2.0.312b ---

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TiToine

Sujet du message: Re: About reports...

Publié: Dim Nov 16, 2008 5:44 pm

Site Admin

Inscription : Lun Mars 20, 2006 11:16 am
Message(s) : 3356
Localisation : Montréal

OK I will try to analyze the file.
For the moment I generate this for each month:

Code :

       MONTHLY CLIMATOLOGICAL SUMMARY for janvier 07

NAME:    CITY:    STATE: 
ELEV:     0 m  LAT:   0° 00' 00" N  LONG:   0° 00' 00" W

                   TEMPERATURE (°C), RAIN  (mm), WIND SPEED  (km/h)

                                      HEAT  COOL        AVG
    MEAN                              DEG   DEG         WIND                 DOM
DAY TEMP  HIGH   TIME   LOW    TIME   DAYS  DAYS  RAIN  SPEED HIGH   TIME    DIR
------------------------------------------------------------------------------------
 1   4,5   6,8   13:15   1,7   23:00   0,0   0,0   0,5  15,2  35,0   03:45     S
 2   0,2   5,1   00:00  -2,2   12:00   0,0   0,0   0,3  18,6  35,0   14:00     W
 3   3,8   6,4   15:00   0,5   00:00   0,0   0,0   0,0  16,6  32,0   12:14    SW
 4   6,9  10,9   14:30   4,2   10:15   0,0   0,0   0,0  13,2  34,0   11:45   SSW
 5   8,0  10,9   18:30   5,2   04:15   0,0   0,0  13,7   6,5  21,0   02:29     S
 6   7,5  11,7   14:30   4,6   22:45   0,0   0,0   8,4  14,3  53,0   14:15    NW
 7   3,5   4,4   00:00   2,7   08:00   0,0   0,0   0,0  15,0  43,0   00:00   WSW
 8   3,3   6,2   13:00   0,7   04:00   0,0   0,0  16,5  14,9  45,0   13:29     S
 9   0,5   2,1   01:15  -2,8   23:45   0,0   0,0   0,3  17,6  39,0   03:45   WSW
10  -8,4  -3,5   00:00 -11,9   22:00   0,0   0,0   0,0  14,8  31,0   20:30   WNW
11  -6,6   0,7   23:30 -12,2   02:15   0,0   0,0   0,0  11,7  31,0   16:00     S
12   2,8   5,2   23:15   0,1   05:45   0,0   0,0   8,6   9,9  26,0   02:00   SSW
13  -4,4   5,1   00:00  -9,3   21:45   0,0   0,0   0,8  13,1  32,0   07:30   NNE
14  -6,4  -3,1   19:29  -9,7   03:15   0,0   0,0   0,0   5,7  16,0   02:00   NNW
15  -8,2  -4,9   00:00  -9,5   13:45   0,0   0,0   0,3  18,3  42,0   15:00   NNE
16 -12,5  -9,1   00:00 -18,9   23:45   0,0   0,0   0,0  14,3  35,0   18:15    NW
17 -18,5 -14,4   23:45 -21,6   07:45   0,0   0,0   0,0   9,9  21,0   00:30   WSW
18  -6,5  -2,2   23:45 -13,9   00:00   0,0   0,0   0,0   8,3  19,0   10:15   SSE
19  -2,1  -0,9   04:45  -4,7   11:00   0,0   0,0   0,5   7,1  21,0   14:00   WSW
20 -11,1  -2,5   00:00 -15,8   23:45   0,0   0,0   0,0  20,7  35,0   07:00   WNW
21 -14,4 -11,2   16:15 -18,0   08:00   0,0   0,0   0,0   9,9  35,0   00:30    SW
22 -10,6  -8,9   16:00 -12,4   08:00   0,0   0,0   0,0   3,7  11,0   14:15    NE
23  -6,7  -3,0   23:00  -9,8   00:30   0,0   0,0   0,0   7,9  19,0   13:30     S
24  -7,7  -0,9   04:30 -14,2   23:45   0,0   0,0   0,0  12,3  40,0   05:00     W
25 -16,6 -14,3   00:00 -18,6   07:30   0,0   0,0   0,0  11,5  29,0   18:00   NNW
26 -18,8 -17,1   15:15 -20,4   07:45   0,0   0,0   0,0  12,8  27,0   07:45     W
27 -16,7 -14,3   21:29 -19,0   06:45   0,0   0,0   0,0   6,2  19,0   15:45    NE
28 -11,7  -8,7   15:15 -14,4   07:30   0,0   0,0   0,0   4,0  13,0   03:00   NNW
29 -13,7 -11,3   14:30 -16,3   23:45   0,0   0,0   0,0  10,5  29,0   17:15     W
30 -16,3 -13,3   15:44 -19,6   07:45   0,0   0,0   0,0   6,4  18,0   08:15     W
31 -12,4  -9,1   14:00 -15,8   05:44   0,0   0,0   0,0   6,9  26,0   14:14   WSW
-------------------------------------------------------------------------------------
    -6,2  11,7     6   -21,6    17     0,0   0,0  49,8  11,5  53,0     6     WSW

Max >=   32,0:  0
Max <=    0,0: 19
Min <=    0,0: 23
Min <=  -18,0:  7
Max Rain: 16,47 ON 08/01/07
Days of Rain: 10 (> .2 mm) 4 (> 2 mm) 0 (> 20 mm)
Heat Base:  18.3  Cool Base:  18.3  Method: Integration

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TiToine

Sujet du message: Re: About reports...

Publié: Dim Nov 16, 2008 6:43 pm

Site Admin

Inscription : Lun Mars 20, 2006 11:16 am
Message(s) : 3356
Localisation : Montréal

Pidou, can you provide me a day where the Heat and Cool Deg Days are not 0?

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Pidou

Sujet du message: Re: About reports...

Publié: Dim Nov 16, 2008 7:51 pm

Membre

Inscription : Dim Juil 27, 2008 6:06 pm
Message(s) : 478

Hi Antoine,

This is the datas for the 6th of August => http://www.meteo-boisney.fr/NOAA/06-08-08.txt
-- HDD = 1.3
-- CDD = 4.5
An incredible day, isn't it ?
And here the NOAA report for August => http://www.meteo-boisney.fr/NOAA/Août-2008.TXT

Have fun :lol:

PS : I don't know what I've done on the record of 14/11/08, but there is a lot of more than the day records !

_________________
Ma station => http://www.meteo-boisney.fr

--- Station Vantage Pro 2 - Plugin VantagePro.dll ---
--- GraphWeather Version 2.0.312b ---

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TiToine

Sujet du message: Re: About reports...

Publié: Dim Nov 16, 2008 8:05 pm

Site Admin

Inscription : Lun Mars 20, 2006 11:16 am
Message(s) : 3356
Localisation : Montréal

Thanks!

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Pidou

Sujet du message: Re: About reports...

Publié: Dim Nov 16, 2008 8:47 pm

Membre

Inscription : Dim Juil 27, 2008 6:06 pm
Message(s) : 478

You're welcome

_________________
Ma station => http://www.meteo-boisney.fr

--- Station Vantage Pro 2 - Plugin VantagePro.dll ---
--- GraphWeather Version 2.0.312b ---

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TiToine

Sujet du message: Re: About reports...

Publié: Dim Nov 16, 2008 9:33 pm

Site Admin

Inscription : Lun Mars 20, 2006 11:16 am
Message(s) : 3356
Localisation : Montréal

Implemented! In fact the calculation is very simple.
Now...NOAA for years.

Code :

       MONTHLY CLIMATOLOGICAL SUMMARY for janvier 08

NAME:    CITY:    STATE: 
ELEV:     0 m  LAT:   0° 00' 00" N  LONG:   0° 00' 00" W

                   TEMPERATURE (°C), RAIN  (mm), WIND SPEED  (km/h)

                                      HEAT  COOL        AVG
    MEAN                              DEG   DEG         WIND                 DOM
DAY TEMP  HIGH   TIME   LOW    TIME   DAYS  DAYS  RAIN  SPEED HIGH   TIME    DIR
------------------------------------------------------------------------------------
12   1,6   4,6   00:00  -2,3   23:30  16,6   0,0   0,3  16,6  35,0   13:45    NW
13  -5,3  -2,5   00:00  -7,6   07:45  23,3   0,0   0,0  12,8  31,0   22:45     E
14  -5,6  -4,7   10:29  -6,6   21:30  23,6   0,0   0,0  18,1  29,0   13:15   NNE
15  -5,4  -2,9   15:00  -7,4   07:30  23,4   0,0   0,0   7,6  21,0   00:00    NW
16  -6,7  -4,1   13:44  -9,6   07:29  24,7   0,0   1,0   7,7  16,0   05:30     W
17  -7,0  -0,6   22:30 -10,1   05:00  25,0   0,0   1,0   5,0  23,0   22:30    NE
18  -1,0   3,2   10:45  -4,2   23:15  19,0   0,0   3,8  22,3  50,0   12:29    SW
19  -4,2  -1,6   13:45  -9,6   23:45  22,2   0,0   0,0  13,9  42,0   09:00     W
20 -14,0  -9,9   00:00 -17,5   23:44  32,0   0,0   0,0  11,8  27,0   15:45   NNW
21 -14,6 -10,7   17:30 -19,0   03:00  32,5   0,0   0,0   8,8  27,0   14:15     W
22  -7,8  -5,1   15:30 -10,4   00:00  25,8   0,0   0,0   7,2  21,0   07:45     S
23  -8,7  -5,5   12:30 -13,2   23:45  26,6   0,0   0,0  12,5  35,0   13:00   WNW
24 -14,5 -11,3   15:30 -17,2   09:00  32,5   0,0   1,0   6,4  13,0   02:15    NE
25  -9,9  -5,3   16:45 -15,1   04:00  27,9   0,0   0,0  10,6  27,0   16:30   WNW
26  -7,8  -5,0   13:14 -10,9   07:15  25,9   0,0   0,8   5,2  19,0   04:30   NNW
27  -9,5  -6,6   15:30 -12,1   07:15  27,5   0,0   0,0   8,9  18,0   07:00    NE
28  -6,3  -2,0   14:00  -9,5   08:00  24,3   0,0   0,3   2,8  13,0   00:15    NE
29  -7,5  -3,2   23:30 -11,6   09:00  25,6   0,0   0,0   8,9  21,0   11:45   ENE
30  -1,8   4,7   09:30  -8,8   22:45  19,9   0,0  20,3  24,1  60,0   12:30    SW
31  -7,4  -5,5   15:00  -9,5   05:00  25,4   0,0   0,0  15,5  35,0   02:00     W
21
22
23
24
25
26
27
28
29
30
31
-------------------------------------------------------------------------------------
    -7,2   4,7    30   -19,0    21   503,8   0,0  28,4  11,3  60,0    30     NNW

Max >=   32,0:  0
Max <=    0,0: 17
Min <=    0,0: 20
Min <=  -18,0:  1
Max Rain: 20,32 ON 30/01/08
Days of Rain: 8 (> .2 mm) 2 (> 2 mm) 1 (> 20 mm)
Heat Base:  18,3  Cool Base:  18,3  Method: Integration

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Andrea75

Sujet du message: Re: About reports...

Publié: Lun Déc 01, 2008 8:16 pm

Membre

Inscription : Dim Avr 20, 2008 7:57 pm
Message(s) : 41

Thanks Antoine for this feature that I request. I'll test new version as soon as possible! :wink:

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