SECTION 6.4.2, CALCULATIONS

Subpart 1. 6.4.2.1.1 Climatic data design conditions. ASHRAE 90.1 section 6.4.2.1 is amended by adding a subsection to read as follows: 6.4.2.1.1 Climatic data design conditions. Climatic data design conditions for the calculation of heating and cooling loads shall be determined by using either item 1 or 2: 1. the climatic data in Table 6.4.2.1 for the city where the building is located or the nearest city listed in Table 6.4.2.1; or 2. the weather data published as a part of ASHRAE Standard 169-2013 at www.ASHRAE-meteo.info. The weather data for the city where the building is located or for the nearest available city shall be used. The data shall be used as follows: (a) design temperatures shall be rounded to the nearest whole number; (b) winter design conditions shall be the mean extreme annual temperature; and (c) summer conditions shall be the one percent annual cooling design conditions. Subp. 2. Table 6.4.2.1. Climatic data design conditions. ASHRAE 90.1 section 6.4.2.1 is amended by adding a table to read as follows: TABLE 6.4.2.1 CLIMATIC DATA DESIGN CONDITIONS City | Winter Design db °F | Summer db °F/coincident wb °F Aitkin | -28 | 82/72 Albert Lea | -19 | 86/72 Alexandria | -23 | 85/70 Bemidji | -30 | 82/67 Brainerd | -27 | 85/69 Cloquet | -24 | 82/68 Crookston | -28 | 84/70 Duluth | -23 | 81/67 Ely | -34 | 82/67 Eveleth | -31 | 82/67 Faribault | -21 | 88/73 Fergus Falls | -26 | 85/70 Grand Marais | -19 | 73/62 Grand Rapids | -25 | 82/67 Hibbing | -31 | 82/68 International Falls | -35 | 82/67 Litchfield | -20 | 86/72 Little Falls | -26 | 86/70 Mankato | -16 | 86/72 Minneapolis/St. Paul | -17 | 88/72 Montevideo | -19 | 88/73 Mora | -24 | 86/70 Morris | -23 | 86/72 New Ulm | -19 | 88/73 Owatonna | -19 | 86/72 Pequot Lakes | -31 | 85/68 Pipestone | -19 | 86/73 Redwood Falls | -19 | 88/73 Rochester | -19 | 85/72 Roseau | -31 | 84/72 St. Cloud | -24 | 86/71 Silver Bay | -28 | 82/66 Thief River Falls | -27 | 82/68 Tofte | -14 | 75/61 Virginia | -31 | 82/67 Warroad | -32 | 82/70 Wheaton | -23 | 86/72 Willmar | -22 | 86/72 Winona | -18 | 88/73 Worthington | -16 | 86/71 Db = dry bulb temperature, degrees Fahrenheit Wb = wet bulb temperature, degrees Fahrenheit Statutory Authority: MS s 326B.02 ; 326B.101 ; 326B.106 History: 47 SR 983