Photometry and the photometric data sheet indoor page 1. Ies coefficients of utilization zonal cavity method effective floor cavity reflectance 0. For outdoor lighting applications, a coefficient of utilization curve is provided, thecu is read directly from the curve and the standard lumen formula is used. The software tools, which were created to perform indoor hid lighting designs for. Indoor lighting zonal cavity method for indoor lighting calculations to be able to properly design lighting systems for indoor locations, the lighting designer needs to understand the zon al cavity method of calculations and all the factors that enter into them. May 12, 2015 cavity ratio values approximate this effect by combining these proportions into a single quantity. Zonal cavity methodthe zonal cavity method sometimes called the lumen method is the currently acceptedmethod for calculating average illuminance levels for indoor areas, unless the light distribution is radically asymmetric. Use room estimator to determine an approximate number of luminaires required to meet a specified average level of illuminance on a workplane or floor or based on a maximum lpd lighting power density specification. An approximate method utilizing the zonal cavity approach is presented and compared to the fullblown method. The lumen method in brief consists of calculation of the cavity ratios of the upper, middle, and. Two names for a method to calculate the average maintained horizontal illuminance on a workplane within a space.
Physical characteristics of the room, including length, width and height. Other analysis methods, including modular lighting design tools, isolux charts, illuminance cone charts, preestablished tables, and computer simulations. Zonal cavity method for indoor calculations pdf free download. The lumen method or zonal cavity calculation is a quick and simple technique for predicting the average illuminancelevel in a room. Zonal lumens 010average candlepower 5 x lumen constant zonal lumens 2778. For the love of physics walter lewin may 16, 2011 duration. Recommended procedure for calculating coefficients of. In the zonalcavity method, the effects of room proportions, luminaire suspension length, and workplane height upon the coefficient of utilisation are respectively represented by the room cavity ratio, ceiling cavity ratio, and floor cavity ratio. Flux transfer equations had been solved by computer, and the resulting.
Ambient environment determining light levels light levels can be too low or too high for a task appropriate light levels depend on the visual task to be performed the iesna has 9 categories a thru i of illumination values a thru c dont involve direct visual performance, each divided into 3 values low, middle, high for a. Luminaire layout that would follow completion of the calculations is explored. Method of calculations electrical distribution system. Since the zonal cavity method only gives an average lighting level. The visual interior tool is designed to perform lumen method calculations on a rectangular room. Lighting fundamentals index introduction lighting associates, inc. The lumen method of lighting calculation determines the average illuminance in a given space as. Typical steps involved are decide on the type of luminaires you plan to use for an application. Design calculations establish minimum guidelines and requirements for generating electrical calculations on projects. Electrical commercial load calculations 1 08 22 14 duration. Simple calculation the ies zonal cavity method also known as the lumen method is used to decide the number of luminaires to achieve the required lux level on a work plane in an interior space, taking into account the room index, cou, maintenance factor, etc. Lighting calculation zonal cavity method 11 20 youtube. For outdoor lighting applications, a coefficient of utilization curve is provided, the cu is read directly from the curve and the standard lumen formula is used.
Zonal cavity lumen method calculations by using ies procedures. Manual switches, time switches, dimming, daylight linked controls. The lumen method determines average illuminance achieved on the workplane using a derived property of luminaire photometrics and room geometry called the coefficient of utilization. Lighting design strategies for ecbc compliant buildings. Zonal cavity method or lumen method is an accurate hand method for indoor. Photometric tests of indoor luminaires are carried out in. Lighting design calculations by using online tools. Only the direct illumination from the luminaires to the workplane is taken into account, and the actual layout of the luminaires is ign. Zonal cavity method for indoor calculations lighting. For indoor lighting situations, the zonal cavity method is used with data. For indoor lighting situations, the zonal cavity method is used with data from a coefficient of utilization table. This hand method provides a high degree of accuracy for indoor. Zonal cavity method for indoor calculations lighting light free. Agi32 provides a quick design tool for interior spaces using the ies zonal cavity method, called room estimator.
Electric lighting calculations moon and six pencebath, uk task lighting point source or line source method ambient lighting lumen or zonal cavity method two kinds of calculations point source method. Room length x room width room cavity ratio for irregularshaped rooms 2. Cavity ratio values approximate this effect by combining these proportions into a single quantity. Interior lighting design methods part one electrical knowhow. In lighting design, the lumen method is a simplified method to calculate the light level in a room.
In the previous articles in this course advanced course for lighting design level i, i explained the lighting design calculations by using 4 different methods in the following articles. Electrical calculations should be made for all spu projects that include electrical components and should be filed in the project notebook. Photometry and the photometric data sheet indoor page 3 figure 5 figure 5a. Basics of indoor lighting calculations dea 3500 human factors. Values calculated during the zonal cavity method are shown in the collapsible panel below the display settings.
Zonal cavity method for indoor calculations methods of calculating illuminance in order to design a luminaire layout that best meets the illumina requirementss of the job, two types of information are generall requirement illuminance level and illuminance level at a given point. In the zonal cavity method, the cu, the effects on light distribution of the luminaire mounting height, the rooms size and proportions, and the height of the workplane are considered mathematically. Zonal cavity method for indoor calculations methods of calculating illuminance in order to design a luminaire layout that best meets the illuminance and uniformity requirements of the job, two types of information are generally needed. The ies zonal cavity method also known as the lumen method is used to decide the number of luminaires to achieve the required lux level on a work plane in an interior space, taking into account the room index, cou, maintenance factor, etc. The following sections describe these methods of calculation. Zonal cavity method lumen method term of lighting design. The method is a series of calculations that uses horizontal illuminance criteria to establish a uniform luminaire layout in a space. Point by point method, watts per square foot method. In the zonal cavity method, the effects of room proportions, luminaire suspension length, and workplane height upon the coefficient of utilisation are respectively represented by the room cavity ratio, ceiling cavity ratio, and floor cavity ratio.
Ies illuminating engineering society had been developed a procedure for calculation of average illuminance by using the zonal cavity lumen method which is the best and more professional one between other procedures for doing the same. The description section is the first section of an ltl indoor photometric test report. Nov 16, 2012 indoor lighting calculation zonal cavity. For indoor lighting situations, the zonal cavity method is used with data from acoefficient of utilization table. Design and analysis of a new natural illumination device through. The room cavity ratio rcr is determined by using the zonal cavity method. In its simplest form, the lumen method is merely the total number of lumens. Design calculations may be made either manually or by spuapproved computer programs.
These values are provided to help those curious about how the zonal cavity method works see the intermediary values that must be calculated in order to perform the calculation. It provides the specific information about the luminaire being tested as. Methods of calculating illuminance in order to design a luminaire layout that best meets the illuminance and uniformity requirements of the job, two types of information are generally needed. Nov 20, 20 lighting calculation zonal cavity method. Zonal cavity method for indoor calculations free download as pdf file. In lighting design, the lumen method, also called zonal cavity method, is a simplified method to calculate the light level in a room. The following two methods can be used if calculations are to be. Zonal cavity method for indoor calculations pdf document. Solid state light conversion scholarworks at wmu western.
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