As a result of a holistic approach to energy policy the municipality of Thisted in 2010 issued energy performance certificates for the comprehensive school in the town of Hanstholm along with all the other 190 public buildings in the municipality.
- Guided tours: By appointment
- Open: All year round
- Booking: Please contact Hanstholm skole
- Participants: By appointment
- Admittance fee: None
- Parking: By the school
- Public transportation: Bus no 317 and 327 stops at Bådsgårdsvej close to the school
- Toilet: Yes.
The project resulted
in a shortlist of energy saving initiatives saving up to 40 million DKK. As a direct result of Thisted municipality’s visionary take on its energy policy, the council has allocated 5 million DKK per year to energy saving projects. This means that all comprehensive schools in the municipality have been fitted with solar panels at a total cost of 2 million DKK. All the energy saving initiatives concerning lighting, heating, ventilation etc. that have been conducted at the school in Hanstholm during recent years are due to this allocation.
With its 8000 m2 the comprehensive school in Hanstholm is a large school. The school was built in the 1960’ies and extended in 2006. The school’s power consumption has been constantly rising partly due to power consuming lights, computers and smart boards and partly due to usage patterns. But by installing new power saving lights and raising awareness about turning of monitors and stand by lights the school’s power consumption has been reduced by over 40% during the last two years.
In 2011 in order to cut costs on the energy budget, a solar power system was installed on one of the school’s south facing roofs: 165 solar panels with a power generation of 36 MW – approx. 30.000 kWh per year. In 2010 the school bought 221.000 kWh electricity as opposed to 140.000 kWh in 2012 and an expected 110.000 kWh in 2013 which is a reduction of 50% compared to 2010. The reduction is primarily due to new light fixtures that have been introduced and will be introduced gradually on the whole school. Pupils monitor the daily power production of the solar panels on computers in the library and the statistics are used in classes.
A major contributor to the extensive power consumption at the school in Hanstholm was the old power consuming light fixtures. Furthermore the lights were often left on in unused rooms because pupils and teachers forgot to turn them of when leaving the room. With the assistance of Bach Electricity from the nearby village of Klitmøller the school begun renovating the existing lighting with various types of low energy and LED lights.
Several rooms have been fitted with new LED lighting and in the classrooms in the A building 86 lights of 80 watt each have been exchanged with 172 LED lights of 12 watt each. The fixtures are equipped with sensors that automatically turn off the lights after a certain period of inactivity in the room, thus solving the problem of lights being on in the school all night. The lights are not automatically turned on by movement in the room but must be turned on by a light switch. This way pupils can pop into the classroom to fetch a bag without the lights turning on thus saving energy and prolonging the lifespan of the lightbulb because of fewer on/off switches. Next up are the lamps in the library.
LED lights are expensive to buy but they will last longer than traditional light bulbs and halogen lights. The new light fixtures and sensors in the classrooms in the A building amounted to an investment of 253.000 DKK with a repayment period of 6-7 years.
LED lamps (light-emitting diode lamps) are very energy efficient and if the right type of LED bulb is chosen, it will give the same lumen output and colour temperature as the old fashioned incandescent light bulbs, yet with much less power consumption. The Danish Energy Agency recommends choosing a LED light bulb with a colour rendering index of at least 80 for a proper colour rendition and a colour temperature between 2.600 and 3.500 Kelvin for a warm light suitable for homes. Finally lumen output and diffusion should match the function of the lamp.
Other Energy Saving Initiatives
Several of the school’s ventilation systems have been renovated with new engines and ventilators which has resulted in a much higher level of efficiency than before. Furthermore the ICS system has been improved in order to achieve a larger extent of control and supervision concerning heating and ventilation reducing power consumption. Individual room temperature control has been installed in order to allow for the heating to be turned on in singular rooms instead of the entire building.
In the future the school plans to initiate a reduction in the water consumption by teaching pupils to save water in home economics and arts classes.
New Usage Patterns
For janitor Jens Jespersen the new light fixtures with automatic lighting control are a big improvement on his everyday routines. He no longer has to check if the lights are off in unused rooms. But he still has to put an effort into helping everyone remember to turn off the computer when leaving work. With more than 100 computers all over the school it makes a difference whether they are running round the clock or just 8 hours a day.
The school in Hanstholm receives heating from Hanstholm District Heating Plant that produces heat from several different sources such as industrial surplus heat from the fishmeal manufacturer Hanstholm Fiskemelsfabrik A/S and from wind energy. Wind turbines at nearby Hjertebjerg deliver power to an enormous electric boiler that heats the district heating water to 72 degrees Celsius before it is pumped out to the consumers. In 2012 the school consumed 735 MWh district heating.
- Solar panels: Approx. 30.000 kWh per year
- District heating: 735 MWh used in 2012.