WeatherConditionsTRY

Basics:

This data set defines the structure of the input files for weather data for test reference years (TRY). On the one hand, this takes into account the following time series characteristics:

• Ambient temperature

• Global solar irradiance

• Direct horizontal solar irradiance

• Diffuse irradiance

• Wind speed and wind direction

• Air pressure

• Relative humidity

• CO2 concentration

• Long wave counter irradiance

The following special parameters define how to use these input data sets within the environment model:

• useDayTime: If true, time base is hour of day (00:00 .. 24:00). Otherwise the input data sets use the hour of year as time base (0 - 8760h).

• useHours: If true, the time base has the unit hours, else, the time base use seconds as unit.

• TemperatureUnit: defines the temperature unit of ambient temperature input data - C: degree Celsius, K: Kelvin, F: degree Fahrenheit, R: degree Rankine, Re: degree Reamur.

• AngleUnit: defines the angle unit of the wind direction input data - DEG: degree, RAD: radiant

• Measurement inclination and orientation angle define the spherical vector of the solar irradiance measurement. Solar irradiance is typically measured vertically to the ground with an azimuth angle of 0°. The orientation angle can thus be set to a minimum of 0°. These parameters are necessary to calculate the direct solar irradiance, in irradiance direction.

• TemperaturAvg7Day: defines the average ambient temperature of the last seven days. This value is needed to initialize system models describing long term physical processes such as the heating and cooling of walls.

• SolarAvg7Day: defines the average solar irradiance of the last seven days.

• Longitude: defines the longitude of a location.

• Latitude: defines the latitude of a location.

• Altitude: defines the altitude of a location.

• DayOfYear: defines the number of the day in a year at initialization.

• dayOfMonth: defines the day in a month at initialization (1 .. 28,29,30,31)

• monthOfYear: defines the month in a year at initialization (e.g. 1 .. January etc.)

• hourOfDay: defines the hour of the day at initialization (1 .. 23)

• dayOfWeek: defines the day of in a week at initialization (e.g. 1 .. Monday)

• year: defines the year at initialization (e.g. 2011)

• useNewInputTables: if true: additional tables (e.g. air pressure, relative humidity, CO2 concentration) are included, else: not

• useTimeZoneParameter: if true: real local time is calculated using the local time zone, else: the calculation uses standard alpha as static input

• GMTOffset: time zone as offset to GMT (e.g. 1 .. GMT+1 = CET, -9 .. GMT-9 = PT)

• enableDST: if true: daylight saving time is considered, else: not

• DSTStartDay: day of year when daylight saving time starts (i.e. hour of day shifts from 02:00 to 03:00)

• DSTEndDay: day of year when daylight saving time ends (i.e. hour of day shifts from 03:00 to 02:00)

The comments of the weather data records define the location of each weather station. Each location ('City') provides input data of one test reference year (TRY) and several specific reference days according to VDI 4655:

• Season: W: winter, T: transit, S:summer

• avg: Always means average values of a specific type of day. Reference days without 'avg' refer to measured values of the specified day.

• Solar irradiance: r: high solar irradiance, n: low solar irradiance

• Cloud amount: s: sunny, o: overcast

• Wind: w: windy, c: calm

The preset input date sets and location parameters automatically parameterize the environment model. Each parameter set can be changed individually in the environment model.