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
How do you calculate Utilisation 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 2 factors of illumination?
Various illumination factors (such as intensity and color temperature) affect the individuals’ visual and cognitive performance [11]. Various factors such as color contrast, illumination level, viewing time, individual differences, gazing and etc., are effective on visual performance [12].
What are the factors affecting illumination?
Design of Lighting Schemes: 8 Factors | Illumination Engineering
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. Colour of Surrounding Walls:
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 illumination of light?
How to Calculate Lighting Illumination
Measure the length and width of the room. Multiply the length times the width for rectangular areas to get the square footage of the room. Multiply your square footage number by 1.5 for general lighting needs, such as for watching television and listening to music.
What is utilization factor in electrical?
Definition of utilization factor
: the ratio of the maximum demand on a generator or generating station to the capacity of the generators.
What is the value of utilization factor?
The utilization factor or use factor is the ratio of the time that a piece of equipment is in use to the total time that it could be in use. It is often averaged over time in the definition such that the ratio becomes the amount of energy used divided by the maximum possible to be used.
What is capacity utilization factor?
For a Solar Photovoltaic (SPV) project, Capacity Utilisation Factor (CUF) is the ratio of actual energy generated by SPV project over the year to the equivalent energy output at its rated capacity over the yearly period.
What is illumination absorption factor?
The Absorption is the “missing piece”, when comparing the total reflected and transmitted energy with the incident energy. The ratio of the total absorbed radiant or luminous flux to the incident flux is called absorptance (formerly also absorption factor).
What are the characteristics of good illumination?
Adequate or good lighting system must possess certain well defined characteristics which are discussed below.
Sufficient Quality. Foot candle is the unit measurement of light. Sufficient Quantity. Brightness. Intensity. No contrasts. Right Diffusion. Direct Lighting. Indirect Lighting.
How does illumination affect human performance in workplace?
From the workers’ perspective, poor lighting at work can lead to eye-strain, fatigue, headaches, stress and accidents. On the other hand, too much light can also cause safety and health problems such as “glare” headaches and stress. Both can lead to mistakes at work, poor quality and low productivity.
How does light affect performance?
Dim lighting tends to cause unnecessary strain on the eyes, which can lead to eye issues or headaches. Employees may experience drowsiness or lose their sense of motivation, which can result in an overall reduction of work productivity. Bright lighting or high-intensity lighting can also affect productivity.
What is cou in illumination?
A coefficient of utilization (CU) is a measure of the efficiency of a luminaire in transferring luminous energy to the working plane in a particular area. The CU is the ratio of luminous flux from a luminaire incident upon a work plane to that emitted by the lamps within the luminaire.
What is space height ratio in illumination?
Space to height ratio is the ratio of space between luminaires (S) to their height above the working plane (Hm). Manufacturers specify the recommended space to height ratio (SHR) for each of their luminaires. Typically, a recommended space to height ratio (SHR) is 1 : 2.
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.
