Generation of a Test Reference Year for Alūksne, Latvia

Abstract

Precise and reliable meteorological data are necessary for building performance analysis. Since meteorological conditions vary significantly from year to year, there is a need to create a test reference year (TRY), to represent the long-term weather conditions over a year. In this paper two different TRY data models were generated and compared: TRY and TRY-2. Both models where created by analysing every 3-hour weather data for a 30-year period (1984–2013) in Alūksne, Latvia, provided by the Latvian Environment Geology and Meteorology Centre (LEGMC). TRY model was generated according to standard LVS EN ISO 15927-4, but to create second model - TRY-2, 30 year average data were applied. The generated TRY contains typical months from a number of different years. The data gathered from TRY and TRY-2 models where compared with the climate data from the Latvian Cabinet of Ministers regulation No. 379, Regulations Regarding Latvian Building Code LBN 003-01. Average monthly temperature values in LBN 003-01 were lower than the TRY and TRY-2 values. The results of this study may be used in building energy simulations and heating-cooling load calculations for selected region. TRY selection process should include the most recent meteorological observations and should be periodically renewed to reflect the long-term climate change.

Test Reference Year of Riga, Latvia

“…LBN 003-15 duration of the heating period is 13 days longer than for TRY, it also has the lowest observed minimal temperature and highest maximum observed air temperature. This tendency is also similar for other TRY models in Latvia [8,9]. The differences in values can be explained with different time periods for measurements of the values.…”

“…International Scientific Conference "RESEARCH FOR ENVIRONMENT AND CIVIL ENGINEERING DEVELOPMENT 17" Proceedings "CIVIL ENGINEERING`17" Comparing the results with other TRY values, TRY of Riga has the same typical temperature and content of moisture combination as TRY of Liepaja [8], where this combination can be observed for 432 hours or by 22.3 % more than for TRY of Riga. The TRY of Aluksne has the same most typical content of moisture 4 g kg -1 , but the most typical air temperature is by 2 °C lower than TRY of Riga 0 °C, and this combination can be observed for 339 hours.…”

“…Both models consist of 8760-hour measurements of meteorological parameters that correspond with average meteorological parameter values for selected period [10]. Both models have been used in various research [1][2][3][7][8][9][10][11][12] In Latvia there have been research for TRY creation for Riga [7,12], but the authors' research for Riga and their previous research for Liepaja [8] and Aluksne [9] are the first ones that analyses 30 year meteorological data for climate model creation.…”

Test Reference Year of Riga, Latvia

“…Comparing the results with other TRY values, TRY of Riga has the same typical temperature and content of moisture combination as TRY of Liepaja [8], where this combination can be observed for 432 hours or by 22.3 % more than for TRY of Riga. The TRY of Aluksne has the same most typical content of moisture 4 g kg -1 , but the most typical air temperature is by 2 °C lower than TRY of Riga 0 °C, and this combination can be observed for 339 hours.…”

“…The total observed time difference for air temperature distribution between TRY and 30-year average data values is 1,476 hours or 16.8 % of total year hour values. That is 6.6% increase of the total observed time difference comparing with TRY of Liepaja [8], and 41.4 % increase comparing with TRY of Aluksne [9]. Fig.…”