1、February 2007DEUTSCHE NORMDIN-Normenausschuss Lichttechnik (FNL)DIN-SprachendienstEnglish price group 11No part of this translation may be reproduced without prior permission ofDIN Deutsches Institut fr Normung e. V., Berlin. Beuth Verlag GmbH, 10772 Berlin, Germany,has the exclusive right of sale f
2、or German Standards (DIN-Normen).ICS 91.160.10!%Ae4“2306617www.din.deDDIN 5034-3Daylight in interiors Part 3: Calculation,English translation of DIN 5034-3:2007-02Tageslicht in Innenrumen Teil 3: Berechnung,Englische bersetzung von DIN 5034-3:2007-02Lumire naturelle lintrieur Partie 3: Calculation,T
3、raduction anglaise de DIN 5034-3:2007-02SupersedesDIN 5034-3:1994-09www.beuth.deDocument comprises 18 pages09.15 DIN 5034-3:2007-02 2 A comma is used as the decimal marker. Contents Page Foreword 3 1 Scope 4 2 Normative references 4 3 Structural geometric relationships for windows 5 3.1 General 5 3.
4、2 Daylight factor 5 3.3 Room parameters 5 3.4 Window dimensions 6 3.5 Geometric parameters for obstructions 8 3.6 Angular parameters for windows and obstructions 9 3.6.1 Window angle .9 3.6.2 Obstruction angle 9 3.7 Reduction factors . 10 3.8 Reflectances and window factors . 11 4 Calculation of the
5、 daylight factor for rooms with windows . 13 4.1 Components 13 4.2 Consideration of reduction factors . 13 4.3 Determination of the sky component DHr14 4.4 Determination of the externally reflected component DVr. 14 4.5 Determination of the internally reflected component DRr14 4.6 Determination of t
6、he daylight factor in rooms with diffusing glazing . 15 5 Average daylight factor for rooms with rooflights 15 6 Period of exposure to sunlight 15 7 Periods of use and relative annual period of use 15 8 Usable luminous exposure and relative usable luminous exposure 16 9 Solar gain . 17 Bibliography
7、. 18 Figures Figure 1 Geometric parameters of a window 7 Figure 2 Geometric parameters for obstructions .8 Figure 3 Determination of the window width angle . 12 Figure 4 Components of the daylight factor 13 Table Table 1 Relation between reduction factor k2and extent of dirt load (default values, se
8、e DIN 5034-1) 10 DIN 5034-3:2007-02 3 Foreword This standard has been prepared by the Normenausschuss Lichttechnik (FNL) (Lighting Technology Standards Committee). DIN 5034 consists of the following parts, under the general title Daylight in interiors: Part 1: General requirements Part 2: Principles
9、 Part 3: Calculation Part 4: Simplified method of determining window sizes in dwellings Part 5: Measurement Part 6: Simplified determination of suitable dimensions for rooflights Amendments This standard differs from DIN 5034-3:1994-09 as follows: a) the standard has been completely revised; b) the
10、standard has been restructured and shortened; c) Tables 3 to 38 are no longer included. Previous editions Supplement 1 to DIN 5034: 1963-11 DIN 5034-3: 1994-09 DIN 5034-3:2007-02 4 1 Scope This standard specifies the method of calculating the expected illuminances, daylight factors, periods of use a
11、nd usable luminous exposures for specific points in interiors, based on the relationships given in DIN 5034-2. It is used to determine whether, given specific window or rooflight dimensions, the minimum values for the daylight factor as specified in DIN 5034-1 are ensured indoors. Of all the various
12、 known calculation methods, this standard recommends a method that has been sufficiently proven in practice, in order to ensure that the results of daylight calculations are comparable. The calculation of radiation from the sun and the sky entering through windows and rooflights is important for inv
13、estigations relating to air-conditioning and economic considerations. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced d
14、ocument (including any amendments) applies. DIN 4710, Statistics on German meteorological data for calculating the energy requirements for heating and air conditioning equipment DIN 5034-1, Daylight in interiors Part 1: General requirements DIN 5034-2, Daylight in interiors Part 2: Principles DIN 50
15、34-6, Daylight in interiors Part 6: Simplified determination of suitable dimensions for rooflights DIN 5035-2, Lighting applications Part 2: Lighting of workplaces DIN 5035-3, Artificial lighting Part 3: Lighting of health care premises DIN 5035-4, Artificial lighting of interiors Part 4: Special re
16、commendations for lighting educational establish-ments DIN 5035-7, Artificial lighting Part 7: Lighting of interiors with visual displays work stations DIN 5036-1, Radiometric and photometric properties of materials Part 1: Definitions, characteristics DIN EN 410, Glass in building Determination of
17、luminous and solar characteristics of glazing DIN EN 12464-1, Light and lighting Lighting of work places Part 1: Indoor work places DIN EN 12665, Light and lighting Basic terms and criteria for specifying lighting requirements DIN 5034-3:2007-02 5 3 Structural geometric relationships for windows 3.1
18、 General All lengths are given in m and all angles are given in degrees. is the elevation angle, the vertex of which lies in the centre of the window. is the width angle, the vertex of which lies at the reference point. is the elevation angle, the vertex of which lies at the reference point. The rel
19、evant dimensions for carrying out the calculation are found in the following clauses. 3.2 Daylight factor The daylight factor D is the ratio of the illuminance at a point on a given plane due to light received directly or indirectly from a sky of known or assumed luminance distribution, to the illum
20、inance on a horizontal plane due to an unobstructed hemisphere of the sky, disregarding the direct sunlight components of both illuminances. NOTE 1 Influences of glazing, dirt, etc. are included. NOTE 2 The contribution of direct sunlight is to be given special consideration in indoor lighting calcu
21、lations. See also DIN EN 12665. 3.3 Room parameters ARis the total area of the room boundary surfaces. AR= 2 (a b + a h + b h) (1) where a is the room depth (for definition, see DIN 5034-1); in rooms with rooflights: room length (see Figure 3); b is the room width (definition, see DIN 5034-1) (see F
22、igure 3); h is the room height; hP is the height of the reference point above the level of the floor. If no further information is given, the reference point lies on a horizontal plane, the reference plane, that is 0,85 m above the finished floor (see Figure 1). P is the reference point at which the
23、 daylight factor D is to be determined. P1, P2are the reference points for determining the daylight factor to achieve sufficient brightness in habitable rooms, and in work rooms with dimensions comparable to those for habitable rooms according to DIN 5034-1 (see Figure 1). The usable area is bordere
24、d by a polyline at a distance of 1 m from the surrounding walls. If not otherwise specified, the usable area lies in the reference plane. DIN 5034-3:2007-02 6 3.4 Window dimensions AFis the area of individual windows (rough opening); =niA1Fis the sum of areas of n windows (rough opening). AF= bF hF(
25、2) where bFis the rough opening width (see Figure 1); hFis the rough opening height (see Figure 1). hF= hFo hFu(3) where hFo is the height above the finished floor of the upper edge of the rough opening for the window (see Figure 1); hFuis the height above the finished floor of the bottom edge of th
26、e rough opening (sill height) (see Figure 1). hFm= (hFo+ hFu) / 2 (4) If there are n rectangular windows of different heights within one wall, then F12Fu2FoFFm2)(Ahhbhni=(5) where hFmis the height above the finished floor of the centre of the window (see Figure 1). DIN 5034-3:2007-02 7 Key bFwidth o
27、f rough opening (see Figure 1) bFl, bFrrespective horizontal distance between a line normal to the window passing through the reference point P and the left or right rough opening reveal (see Figures 1 and 3) hFrough opening height (see Figure 1) hFo height above the finished floor of the upper edge
28、 of the rough opening window (see Figure 1) hFmheight above the finished floor of the centre of the window (see Figure 1) hFo height above the finished floor of the bottom edge of the rough opening (see Figure 1) Fl, Frangle corresponding to bFl, bFr F angle corresponding to hF P reference point Fig
29、ure 1 Geometric parameters of a window NOTE If the dimensions of the rough opening are uncertain (e.g. as for curtain wall faades), the rough opening is defined as the window area including frames. DIN 5034-3:2007-02 8 3.5 Geometric parameters for obstructions Obstructions are obstacles to light, su
30、ch as buildings, hills and trees etc., which hide parts of the sky from the observers standpoint. When calculating the daylight factor in accordance with this standard, it can be necessary to take into consideration local obstructions that do not yet exist but will come into effect due to planned co
31、nstruction measures. Key bVl, bVrwidth of obstruction, measured as the lateral distance from the vertical (left or right) edge of the obstruction to a line normal to the window passing the reference point (see Figure 2) hV(0) height of obstruction above the reference plane with width angle = 0 (see
32、also Figure 2) hV() height of obstruction above the reference plane with width angle (see Figure 2) tV(0) distance to the obstruction from the reference point with width angle = 0 (see Figure 2) tV() distance to the obstruction from the reference point with width angle (see Figure 2) Vangle to the p
33、articular width of obstruction P reference point Figure 2 Geometric parameters for obstructions DIN 5034-3:2007-02 9 3.6 Angular parameters for windows and obstructions 3.6.1 Window angle Fl, Frangle of window width (see Figures 1 and 3) tan(Fl)= bFl/ (a/2+dW) or (6) tan(Fl)= bFl/ (a/2) (see example
34、s in Figure 3) (7) tan(Fr)= bFr/ (a/2+dW) or (8) tan(Fr)= bFr/ (a/2) (see examples in Figure 3) (9) F(0) angle of window height with width angle = 0 (see Figure 1) tanF(0) = (hFo 0,85) / (a/2+dW) (10) F() angle of window height with width angle tanF()= tan F(0) cos (11) 3.6.2 Obstruction angle angle
35、 of obstruction height, determined from the vertex at the window centre (see Figure 3); for a parallel obstruction with an infinite length and a constant height tan = (hV(0) + 0,85 hFm) / (tV(0) a/2 dW) (12) Vl, Vrangle of obstruction width (see Figure 2) tan(Vl) = bVl/ tV(0) (13) or tan(Vr) = bVr/
36、tV(0) (14) V(0) angle of obstruction height with a width angle = 0 (see Figure 2) tanV(0) = hV(0) / tV(0) (15) V() angle of obstruction height with a width angle tanV() = hV() / tV() (16) For a parallel obstruction with an infinite length and a constant height: tanV() = tanV(0) cos (17) DIN 5034-3:2
37、007-02 10 3.7 Reduction factors D65transmittance (see DIN 5036-1 for definition) of the glazing material for semi-parallel light beams normal to the glazing (determination of transmittance for multiple panes see DIN EN 410) FFFFF11AAAAAk = (18) where k1 is the reduction factor for framing and glazin
38、g bars. When disregarding the reduction factor for slanting incident light, the following applies FFAA is the area of construction components FA is the area of rough openings FA is the area of the transparent glazing k2is the reduction factor for dirt (guidance values see Table 1) Table 1 Relation b
39、etween reduction factor k2and the extent of dirt loading (default values, see DIN 5034-1) Dirt load on k2external surface internal surface low low 0,9 medium 0,8 heavy 0,7 medium low 0,8 medium 0,75 heavy 0,7 heavy low 0,7 medium 0,6 heavy 0,5 Due to the relatively short intervals between cleanings
40、in habitable rooms, it is generally sufficient to use k2= 0,95 in calculations. k3is the reduction factor for light incidence that is not normal to the surface. According to 1, for commonly used double glazing it is sufficient to assume k3= 0,85 DIN 5034-3:2007-02 11 3.8 Reflectances and window fact
41、ors VReflectance of the obstruction. If the exact value is unknown, use: V= 0,2 mean reflectance of room surfaces BWmean reflectance of the floor and lower parts of walls without window wall (bottom part up to the centre of the window) DWmean reflectance of the ceiling and upper parts of walls witho
42、ut window wall (upper parts above the centre of the window) f () window factor, ratio of the vertical illuminance on the window surface depending on the obstruction angle EV () to the horizontal illuminance Ea(external daylight factor) fo() window factor, determined by the luminous flux from the upp
43、er semispace which is incident on the window outside, as a function of the obstruction angle 2cos3077,0sin2182,08318,0)(o+=f (19) fu() window factor, determined by the luminous flux from the lower semispace which is incident on the window outside, depending on the obstruction angle 14067,0)2sin(1901
44、8,0180/38036,0cos86032,0)(u+= f (20) aVuo/)()()()( EEfff =+= (21) )tan2(arctan = (22) g = e+ qi(23) where eis the solar direct transmittance of the glazing; qiis the secondary internal heat transfer factor; g is the total solar energy transmittance (solar factor); EeFis the the irradiance on the out
45、side of the glazing (see DIN 5034-2). DIN 5034-3:2007-02 12 Key a room depth (see DIN 5034-1 for definition), in rooms with rooflights: room length b room width (see DIN 5034-1 for definition) bFl, bFrhorizontal distance between a line normal to the window passing reference point P and the left or r
46、ight rough opening reveal of the considered window Fl, Fr window width angle for the considered window dWthickness of external wall P reference point used to determine the daylight factor D P1, P2reference points used to determine the daylight factor to achieve sufficient brightness in habitable roo
47、ms, and in work rooms with dimensions comparable to those for habitable rooms according to DIN 5034-1 (see Figure 1) Figure 3 Determination of the window width angle DIN 5034-3:2007-02 13 4 Calculation of the daylight factor for rooms with windows 4.1 Components The daylight factor D generated at a
48、point by incident light coming through clear glazing is the sum of the sky component DH(light produced directly by the sky), the externally reflected component DV(light reflected from obstructions, ground etc.), and the internally reflected component DR(light reflected from internal surfaces) as shown in Figure 4, which shows an example for a room with a window in one wall: Key DH sky component DR internally reflected component DV externally reflected component hPheight of the reference plane P reference point Figure 4 Components of the daylight factor D = DH+ DV+ DR(24)
