Re: [EnergyPlus_Support] Re: Solar radiation components in Bin weather file

You don't work directly with the *.BIN file. There is the doewth program that comes with DOE-2 that

packs, i.e., converts from a standard weather file format, such as TMY2, WYEC2, etc., to a *.BIN file.

I believe the WeatherConverter program in EnergyPlus has similar capabilities.

If you want to look at or change the contents of a *.BIN file, there are also two simple programs,

fmtwth2 and wthfmt2 (written by Fred!), that convert the *.BIN format to a redable *.FMT format, and back again.

However, I do not recommend writing a *.FMT file from scratch, since you will then have to calculate such

variables as wet-bulb temperature, absolute humidity, and enthalpy, in addition to adding the solar.

The approach I took was driven by the need to add solar values to raw data that did not have any measured solar.

Consequently, I first put the raw data into the TMY2 format, pack them into *.BIN files with no solar,

and then used DOE-2 to calculate the solar angles and run the empirical solar models to calculate

the global horizontal and direct normal radiation, that were then spliced into either the *.TMY2 or *.FMT files.

The *.TMY2 files were then converted to *.EPW, and the *.FMT to *.BIN.

If you are working with measured solar, then you don't need the second step, and can go directly from

the raw data to either a *.EPW using the WeatherConverter or a *.BIN file using doewth.

Joe

----- Original Message -----

From: eric_zhou1223

To: EnergyPlus_Support@xxxxxxxxxxxxxxx

Sent: Thursday, December 04, 2008 5:06 PM

Subject: [EnergyPlus_Support] Re: Solar radiation components in Bin weather file

Thank you all for the guidence, Joe, Fred, and Linda.

DOE-2 *.BIN seems to be a binary format which could not be edited
via a text editor straightforward in my brain. So I chose the epw
format as the
bridge. Am I missing some tool used to edit the bin file directly?

Eric

--- In EnergyPlus_Support@yahoogroups.com, "Joe Huang" <joe@...>
wrote:
>
> Eric,
>
> If measured solar data is available, then by all means you should
get it.
> However, make sure first that the weather bureau is indeed
providing measured
> radiation, and not calculating it from other parameters, since
recording solar
> radiation is not standard operating practice for typical weather
stations. If
> you can get measured solar, consider yourself very lucky.
>
> The only critical measured radiation values are the global
horizontal, and the direct
> normal radiation. Everything else can be calculated from these two.
> If your weather bureau can provide only the global horizontal, you
will need to use
> a model to do the direct/diffuse split.
>
> The DOE-2 *.BIN file contains just the global horizontal and
direct normal.
> I'm surprised you're thinking of creating an EPW and then
translating it to BIN.
> I've been doing the opposite - create first a "bare bones" *.BIN
file, and then
> filling out the additional data needed for an EPW.
>
> Joe Huang
> White Box Technologies, Inc.
>
> ----- Original Message -----
> From: eric_zhou1223
> To: EnergyPlus_Support@yahoogroups.com
> Sent: Wednesday, December 03, 2008 9:52 PM
> Subject: [EnergyPlus_Support] Solar radiation components in Bin
weather file
>
>
> All,
>
> I am planning to buy weather data from weather bureau to create
our own
> customized epw weather file for a location. Then the epw file
will be
> changed to bin format for DOE2 use. In epw weather file,
included are
> Global horizontal Solar Radiation, Direct Normal Radiation,
Diffuse
> Horizontal Radiation. I would think three items impact on the
results.
> How about the BIN file? Is it enough to get the Global
horizontal Solar
> Radiation only for the BIN format?
>
> There are two options for me:
> 1) Get Global horizontal Solar Radiation data and leave the
other two
> alone;
> 2) Buy global horizontal and direct normal radiation. We then
calculate
> the third one.
>
> Does anyone have any idea of it? Which way is better to go. Any
input
> is much appreciated.
>
> Eric
>

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