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What you should know about lighting system maintenance (2)

maintenaceSystem 1. Group relamping with no interim replacement of lamps is particularly suitable for large ceiling areas where the failure of a few lamps does not affect the lighting level and aesthetics significantly. The individual lamp burnouts are ignored until a predetermined number of lamps fail, indicating that a group relamping is due. This system is suitable to a fluorescent source and the group replacement should not exceed 70% of average lamp life to make the best use of lumen depreciation.

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What you should know about lighting system maintenance (1)

maintenance

Facility owners view lighting maintenance as an absolutely necessary evil-i.e. expense-to help sustain the full economic value of their system. Facility managers and lighting-maintenance contractors sustain the full value of their time through lighting maintenance.

 


As soon as a new lighting system is energized, the light level starts to gradually decrease because of various aging characteristics. For that reason, a lighting design usually provides, initially, an illuminance (a footcandle level) above the minimum-specified level to compensate for the light reduction over time.

Light depreciation is defined by the term light loss factor (LLF). Expressed as a percentage, the LLF considers all the conditions contributing to the reduction of light over time. In addition to the gradual and constant reduction in a lamp's lumen output, a percentage of gradual light reduction also comes from the dirt buildup on the reflecting surfaces of a luminaire and on the surfaces of a room. The LLF should always be included in any calculations to determine the lighting requirements in a space.

Maintenance reduces lighting costs The initial foot-candle level of a lighting system decreases over time because of depreciation. For that reason, a well-thought-out program of regular maintenance can greatly reduce these light losses and pay for itself by saving on energy costs.

In a new installation, rather than having excessive initial illumination to allow for a 0.70 LLF, regular washing and group relamping is recommended. Such an approach changes the LLF to 0.95 (a 5% loss), thereby permitting the lighting system to use 25% fewer lamps and luminaires. This reduces electric energy use by 25%. Additional savings come from reduced air-conditioning loads and smaller electrical system components, such as transformers, panelboards, and feeder conductors.

The key to getting the greatest benefit from group relamping is to select the best time interval between relamping. While it is impossible to predict when each lamp in a lighting system will fail, a certain number of lamps will fail in a predictable manner. This is shown in the lamp's morality curve supplied by the lamp manufacturer.

Thus, group relamping follows the lamp's morality curve. Two systems can then be used to apply the morality curve.

Source : ecmweb.com

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Safety in Automation

installation machine

Many of today’s legacy manufacturing systems were developed with a either a blind eye or a minimalist approach to safety. Older technology usually forced machines to come to a full stop and be in a “safe state” before repair or maintenance work could be performed. Because this downtime decreased productivity, personnel often bypassed safety equipment, a hazardous condition, to say the least.

 

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How to avoid electrical hazards with air logic

electrical hazards

Electrical and electronic devices such as logic circuits, programmable controllers, and PCs normally control fluid-power and fluid-handling circuits. Such systems can also operate with “air logic,” controls that function like relays, switches, time delays, and counters. However, while the circuitry is similar, compressed air is the control medium instead of electric current.

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Basic principles of heat treatment

Heat treatmentHeat treatment of a metal or alloy is a technological procedure, including controlled heating and cooling operations, conducted for the purpose of changing the alloy microstructure and resulting in achieving required properties.

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Vacuum rated gears help test ion thrust propulsion system

TECHCONVINA fACTORYCARE

As a leading European player in Electric Propulsion (EP) design and development, QinetiQ manufactures ion thrusters which harness electrical energy to accelerate propellant to high velocity. Whilst the acceleration levels are small, when operating in space these devices propel and position spacecraft with extreme accuracy and with efficiency levels that are an order of magnitude better than with conventional liquid propulsion systems.

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Energy saving above and beyond the electric motor

Energy saving

Looking at the entire drive chain, this article from Lenze looks at the obvious and less obvious places where energy can be saved.

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Compression molding

compression molding

Originally developed to manufacture composite parts for metal replacement applications, compression molding is mostly used to make larger flat or moderately curved parts such as hoods, fenders, scoops, spoilers, lift gates and the like for automotive end-uses.  ed platens are closed by a hydraulic ram.

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Conserving energy

conserving energyFor this weekend green ideas, I've decided to share some tips on how to conserve energy.

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Ground Breaking Ceremony of Texhong in Quang Ninh - Vietnam


The groundbreaking ceremony for a yarn factory has been held at Hai Yen Industrial Zone, Mong Cai city by the owner, Texhong Textile Group from China.Attending at the ceremony was the Vice Chairman of Quang Ninh PPC Dang Huy Hau.

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Information & News


What you should know about lighting system maintenance (2)
System 1. Group relamping with no interim replacement of lamps is particularly...Read more
07-01-2013
What you should know about lighting system maintenance (1)
Facility owners view lighting maintenance as an absolutely necessary...Read more
20-12-2012
Safety in Automation
Many of today’s legacy manufacturing systems were developed with a...Read more
04-12-2012
How to avoid electrical hazards with air logic
Electrical and electronic devices such as logic circuits, programmable...Read more
15-11-2012

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