gratification, too: the first month's electricity bill for the garage dropped 30 percent, even with motion sensors that are not yet fine-tuned. When that happens, 80 percent savings are predicted. Stairwells Alijevski also turned his attention to stairwells, where old fixtures used three luminaires containing fluorescent lamps 1x18W and, including ballast, the total power was 93W. He replaced those with two LED light luminaries 1x14W with a total power of 28W, only a third of the energy and also with better light value. He then gained another 30 percent savings due to built-in motion detectors. “With the built-in motion sensors you have the option of the lights shutting off after one minute without movement, or dimming to 10 percent power for security reasons.” The LED lamps have a 70,000-hour life, and in stairwells where a lamp burns approximately three hours per day, the system could last 45 to 50 years. Payback periods depend on usage and switches, but Alijevski has predicted five to six years to recoup his investment. Commons Another possibility for savings was park lighting, the 125W Mercury lamps that illuminated the apartment block commons. “Mercury is good for about two to three years, about 5,000-10,000 hours, and then it doesn’t supply enough light for its purpose,” says Alijevski. Since April 2015, Mercury lamps have been forbidden in the EU, there was no reason to consider anything but LED. Alijevski installed Ensto Opera pole fixtures in both 42W and 20W variations to see how residents reacted. “People in the test area said the 20W was just fine, so we went with those.” Eventually, he installed 100 Opera fixtures that burn 12 hours per day, about 4,000 hours per year. Since the lifespan of an LED is 50,000 hours, it will be 13 years before lighting intensity will fall off, and then only a 30 percent deterioration. It’s a clear victory over Mercury. Alijevski’s Opera LEDs required an approximate 27,000- euro investment, with energy savings predicted to surpass 8,000 euros per year. A three-year payback period has been estimated, and a 32 percent drop in energy consumption has been recorded already in the first three months. Even more savings are excpected later. The next 20 percent With the first 20 percent savings in energy consumption achieved, Alijevski is facing a new challenge: VätterHem’s CEO has called for an additional 20 percent reduction by 2023. “The first 20 percent was a major challenge,” says Alijevski. “You install LED lights in the public areas, put water meters in apartments so people are aware of their individual consumption. But the next 20 percent will be tougher. It will require a more significant investment.” But Alijevski is up to the challenge. “We will examine the whole,” he says. “We’ll look at more lighting, ventilation, insulation, and windows.” And Ensto will be there to assist. Carl Leitner, Ensto’s Area Sales Manager, says VätterHem and Alijevski are the types who take action and get things done: “They never wait until the last minute to make changes.” Product testing Product testing in VätterHem’s properties is something Afrim Alijevski does often. He installs products side by side and consults residents about what works best for them. “Saving money is nice, but praise from residents is essential,” says Alijevski. “We’ve tried many types of light – much cheaper ones than Ensto’s – but we think good products are worth it because they last.” 80 Ensto Tino LED-luminaires Investment of 37,000 € Payback time 3.5 years 37,000 eur 3.5 years 80 pcs Ensto's Carl Leitner and VätterHem's Afrim Alijevski visit one of VätterHem's properties. Ensto in Sweden 2015, 80 LED fixtures were installed in the production area with an investment of 37,000 euros.
EnstoToday 2016 No1 / ENG
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