What is utilization factor in illumination?
20 June 2014. Coefficient of utilization is the ratio of the luminous flux (lumens) received on a plane to the light output (lumens) of the lamps.
What is depreciation factor illumination?
The reduction of the illumination or luminance occurring in the course of operation is expressed in calculations by the depreciation factor (v). The depreciation factor (v) is the product of the partial depreciation factors (v1, v2 and v3): v = v1 x v2 x v3.
How do you calculate utilization factor for lighting?
Utilization Factor is Proportion of light reaching working plane to the light output of lamps. UF = Lumens received on Working Plan / Lumens output of luminaires. The lighting manufacturers’ catalogues give Utilization Factors for standard conditions. The UF is expressed as a number which is always <1.
What is coefficient of utilization in lighting?
Coefficient of Utilization (CU) is a measure of how much light exiting the fixture will fall on a canopy area of a certain size; CU is an important factor to consider in designing an energy efficient Controlled Environment Agriculture (CEA) facility.
How do you calculate utilization factor?
Utilization Factor = The time that a equipment is in use./ The total time that it could be in use. Example: The motor may only be used for eight hours a day, 50 weeks a year. The hours of operation would then be 2000 hours, and the motor Utilization factor for a base of 8760 hours per year would be 2000/8760 = 22.83%.
What are the factors affecting illumination?
The following factors are required to be considered while designing the lighting scheme:
- Factor # 1. Illumination Level: …
- Factor # 2. Uniformity of Illumination: …
- Factor # 3. Colour of Light: …
- Factor # 4. Shadows: …
- Factor # 5. Glare: …
- Factor # 6. Mounting Height: …
- Factor # 7. Spacing of Luminaries: …
- Factor # 8.
How do you calculate depreciation factor?
The depreciation rate can also be calculated if the annual depreciation amount is known. The depreciation rate is the annual depreciation amount / total depreciable cost. In this case, the machine has a straight-line depreciation rate of $16,000 / $80,000 = 20%.
What is depreciation factor?
Factors are the percentages that are used to depreciate assets. … In progressive depreciation, the amount of depreciation increases each depreciation period. In digressive depreciation, the amount of depreciation per period decreases over time. In straight line depreciation, the depreciation is the same in each period.
How do you calculate illumination?
Lighting Calculation – Summary
Calculate the amount of lumens you need. Multiply the area in square meters by the lux, or the area in square feet by the footcandles. work out how many bulbs you need. Divide the number of lumens by the number of lumens delivered by each bulb.
How do you calculate light distribution?
Calculation in 8 steps
- Total wattage of fixtures: Total wattage of fixtures = Number of lamps x each lamp’s watt. Total wattage of fixtures = 2 × 32 = 64 Watt.
- Lumen per fixtures. Lumen per fixtures = Lumen efficiency (Lumen per Watt) x each fixture’s watt. Lumen per fixtures = 85 x 64 = 5440 Lumen.
- Number of fixtures.
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Which lamp is used in the outdoor illumination of buildings and airport runway?
Halogen lamp – Used in outdoor illumination of buildings & airport runway.
What is light loss factor?
A Light Loss Factor is a multiplier that is used to predict future performance (maintained illuminance) based on the initial properties of a lighting system. • LLF = 1 – Expected Depreciation. • The Total LLF is determined by multiplying the independent effects of. multiple factors.
What is the maintenance factor lighting?
A maintenance factor (MF) is applied to a lighting design to take into account a reduction in the output of the luminaires used within any lighting installation and ensure the correct level of light is delivered at the ‘end of life’.
What is utilization factor in electrical?
In electrical engineering, utilization factor, , is the ratio of the maximum load which could be drawn to the rated capacity of the system. This is closely related to the concept of Load factor.
What is oxygen utilization coefficient?
THE COEFFICIENT of oxygen utiliza- tion. is defined as the arteriovenous differ- ence in oxygen concentration divided by the concentration of oxygen in the arterial blood. Multiplication of the ratio by 100 converts the coefficient into the per cent of arterial oxygen which is removed by the tissue.