Occupancy and light sensors

The sensors respond to motion, switching lights on, when entering an area. When leaving the area it is not immediately plunged into darkness, the lights switch off at a predetermined time. The time delay may be adjusted. Sensors measure light levels in the room and dim or switch off the lights, should sufficient natural light be available. The sensors may be set to control office air conditioners for even higher energy saving. The 'on time' of the air conditioners, may be selected via a second channel time setting. These features are all selected via a simple to use remote control. (No step ladders or tools needed.)

Advantages:
  • Energy management
  • Positive environmental impact
  • Automatically switch off lights when not required
  • High energy saving
  • Prolonged lamp life
  • Convenience
  • Safety

The ceiling mount PIR (Passive Infra-Red) timer is activated on detection of moving body heat, switching on the lighting, which stays on during the selected time period. If body heat is no longer detected the timer switches off the lighting once the time period has elapsed. Should moving body heat be detected during the time period, the timing sequence restarts until moving body heat is no longer detected and the lighting is switched off.
A Lux Level Adjuster means an integral light sensor can be adjusted to keep lighting switched off when sufficient ambient light is available
Variable-frequency drives.

A variable-frequency drive (VFD) is a system for controlling the rotational speed of an alternating current (AC) electric motor by controlling the frequency of the electrical power supplied to the motor.[1][2][3] A variable frequency drive is a specific type of adjustable-speed drive. Variable-frequency drives are also known as adjustable-frequency drives (AFD), variable-speed drives (VSD), AC drives, microdrives or inverter drives. Since the voltage is varied along with frequency, these are sometimes also called VVVF (variable voltage variable frequency) drives.

Variable-frequency drives are widely used. For example, in ventilations systems for large buildings, variable-frequency motors on fans save energy by allowing the volume of air moved to match the system demand. Variable frequency drives are also used on pumps, conveyor and machine tool drives.

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Water heat pumps.

“Heat pump” has become somewhat of a buzz word as energy awareness is on the rise. But what is a heat pump actually? A heat pump is a water heater that uses significantly less energy when heating water in comparison to conventional resistant heating. The reason for this is that where conventional elements have to create all the heat to heat the water, a heat pump transfers the existing heat from the air to the water. The process of moving the heat from the air to the water uses significantly less energy than having to create the heat from nothing.
For our clients with blocks of flats, this means a substantial saving can be achieved on water heating when replacing the existing heating systems with heat pumps. Below are a few examples of projects that we have completed this year!

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Energy Efficiency

Lamps
“Bulbs or Globes” are some of the colloquial names for electric lamps. The incandescent electric lamp was invented by Thomas Alva Edison in 1879 and patented in January 1880. This eventually consisted of an evacuated bulb with a carbonized bamboo filament, capable of lasting 1200 hours. This filament was selected after searching through thousands of different materials.

Nowadays tungsten-based filaments are used, but filament lamps are being phased out of use because they are inefficient compared to modern lamps based on new technologies.
The fitting or "cap" is the part of the bulb that mates with a connector supplying electricity to the lamp. The earliest connector is the "Edison Screw", still in use today.

Incandescent Lamps
Incandescent lamps or light bulbs use electricity to pass a current through a filament, raising it to a very high temperature producing light. To prevent oxidation ("burning") of the filament, it is enclosed in a glass bulb containing an inert gas at very low pressure.
Much of the electric power supplied to the lamp is converted to waste heat, making this the least efficient form of electric lighting.

Halogen Lamps
Halogen lamps use a tungsten filament surrounded by an inert gas and a small amount of a halogen, such as iodine or bromine. The tungsten filament operates at a much higher temperature than in a normal filament lamp and sets up a chemical reaction that prevents tungsten vapour depositing a metal film on the inside of the bulb. Instead of tungsten vapour being formed, the halogen reacts with the tungsten vapour to form a halide. This halide dissociates in high temperture regions redepositing tungsten on the filament and freeing up the halogen. The high temperatures and pressures inside the lamp necessitate the use of a quartz envelope. They can provide more light output for a given power input than normal incandescent and are therefore slightly more efficient.

LED
The first LED was probably produced in 1907. During this period Cat's Whisker radios were the only ones available as valves were yet to be commercialised. HJ Round at Marconi Labs connected his cat's whisker to a battery and observed the emission of green light. This was not a commercial proposition as a device based on this principle is in continual need of adjustment. The "Light Emitting Diode" as we know it was invented in 1962 by General Electric,  but was commercialised by Hewlett-Packard in 1968.

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