How do you calculate Utilisation factor?
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 is the Utilisation factor in lighting?
Utilisation factors show the proportion of the luminous flux from the lamp that reaches the working plan. This is for the specific luminaire and allows for surface reflectivity and Room Index. The UF is used in average lumen calculations to calculate the average illumination level for an area with a specific luminaire.
How do you calculate the number of luminaires?
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.
What is the value of coefficient of Utilisation?
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 happens if the utilization factor gets improved?
What happens if the utilization factor gets improved? Explanation: When the utilization factor increases the core area gets increased. This leads to the increase in the volt/turn for any particular core diameter and specified flux density.
How do you calculate utilization factor in illumination?
Utilization Factor (UF) Maintenance Factor (MF) Equation for Required Illumination is. E = N (n x φ) x MF x UF / A.
How do you calculate utilization factor for lighting?
What are the factors affecting 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].
How do you calculate light spacing?
A good general rule for placement is to divide the height of the ceiling by two. The result is the amount of space to leave between each light. For example, recessed lighting spacing for an 8-foot-high ceiling would be 4 feet between each light. This will provide good spacing for general room lighting.
How do you solve coefficient of utilization?
Calculating CU from a simulation is simple; first calculate the entire light output of the fixture, then measure the output incident on various sized planes at different distances from the fixture. As you will see, increasing the distance of the plane from the fixture results in a lower coefficient.
What is depreciation factor illumination?
Lamp Lumen Depreciation (LLD) is a factor used by lighting designers to predict the depreciation in light output for a specific light source over a defined period. The Lamp Lumen Maintenance Factor (LLMF) expresses the usual reduction of the lumen output over the lifetime.
What is field utilization factor?
The field utilization factor η (the mean electric. field/the maximum electric field) of the standard sphere. gaps was calculated by the charge simulation method, taking into account the ground plane and shanks.
What do you mean by utilization factor in lighting?
The following are some of the definitions which we come across in the design of electric lighting scheme. Utilization Factor or Co-efficient of utilization. It may be defined as “the ratio of total lumens received on the working plane to the total lumens emitted by the light source”.i.e.
What is the ratio of luminous flux and utilance?
The ratio of effective and overall luminous flux is referred to as utilization factor UF. For luminaires with replaceable lamps, UF is composed of light output ratio LOR and utilance U, which depends on the luminous flux distribution of the luminaire as well as room geometry and reflectance of the room surfaces.
What is the utilisation factor of a lamp?
Typical Reflectance Values are: Utilisation Factor (body of the table) This is a value between 0 and 1 that represents the percentage of total lamp lumens in the room that fall on the work plane. It takes into account the room reflectances, room shape, polar distribution and light output ratio of the fitting.
How does the utilization factor affect the size of a room?
It is important to understand the utilization factor of your lighting when you install lights in a room, so you know how much lighting you need. Utilization factor is affected by the size of the room. The larger the room, the smaller the utilization factor for each light.