Back to Right Light Proceedings startpage

Click here to download this paper (PDF file, 655K)

Two Swedish Lighting Retrofits A hotel and a military barrack Lars J. Nilsson University of Lund (Environment and Energy Systems Studies), Sweden Abstract Two recent Swedish lighting retrofits are reviewed here. One is currently being implemented at the Scandic Crown Hotel, one of the newest hotels in Stockholm. The other, in a barrack at the I20/Fo61 infantry regiment in Umeå, was recently completed. At the Scandic Crown Hotel all incandescent lights (ILs) possible are to be replaced with compact fluorescent lights (CFLs). The hotel is also experimenting with occupancy sensors in bathrooms. Scandic Hotels has an agreement with a vendor to buy CFLs at 75 SEK (9.75 ECU) each. According to initial estimates about 5,000 to 6,000 ILs can be replaced. The retrofit has a pay-back time of less than two to three years for ILs burning more than 1,000 hours per year. Non-energy factors are the primary motive for installing occupancy sensors. The barrack at I20/Fo61 was built in 1905 and the pre-retrofit lighting was installed in 1965. Thus, the lighting system needed to be replaced. New fixtures were installed in corridors and barrack-rooms. Nearly all rooms were retrofitted with time-relays to control the lights. Installed lighting power was reduced from 64.7 kW to 56 kW and lighting electricity use reduced by 40% from 117 MWh to 70,7 MWh per year. Lighting quality was improved significantly and lighting levels (lm/m_2) in barrack rooms and corridors were doubled. The total cost of saved energy (CSE) is about 0.30 SEK (39mECU) per kWh. Savings attributable to the use of time-relays has a CSE of approximately 0.15 SEK (19mECU) per kWh. The case-studies show that careful planning of retrofits and new installations is important to avoid lost opportunities for efficiency improvements. The retrofit at the Scandic Crown Hotel, less than one year after its opening, illustrates how operating costs are neglected in the planning of new buildings. The retrofit at I20/Fo61 shows the need for realistic bids on "conventional" new systems to make it possible for utilities to conduct meaningful cost-benefit analyses in conservation programs. The results and experiences from the retrofits are generalizable to large number of similar buildings. Large companies and organizations dominate building ownership and lighting-related decision-making. These groups are important to reach in order to achieve an effective diffusion of efficient lighting technologies. Back to Right Light Proceedings startpage Top of page