In cooperation with an Energy consultant from Ecofellows Ltd. – Ekokumppanit Oy our Erasmus-team has made some measurements in order to improve the Energy Efficiency of our school.
Tap water pressure
The recommended water pressure in water taps is 6l/ min for washing hands and 12l/ min in the kitchen and shower.
In order to determine the tap water pressure we place this measuring jug under the tap, turn the water on full and read the pressure from the scale.
Our team measured the water pressure in many different rooms at our school.
Changing rooms 13l/min
Toilets in the lobby 10l/ min
Theachers’ changing rooms 8,3 l/min
Chemistry classroom 23,3 l/min
Home economics classroom 21,7 l/min
Our measurements showed, that there is room to adjust the water pressure. The water pressure is elevated in all the rooms, but especially Chemistry and Home Economics. The recommended water pressure in kitchens – 12l/ min – is twice as high as for washing hands. The water pressure in home economics, however, was almost twice the recommended level.
Installing water pressure regulators will benefit both the school and nature. When the water pressure is too high, this damages the pipelines and wastes water. Installing a water pressure regulator costs 1000-2000€ a piece, but the investment will pay itself back in 6-12 months. The savings per year are rather in the thousands than in the hundreds.
Please find a table about Water pressure here.
Water pressure in showers
If you want to determine the water pressure in the shower, place the shower handle on the floor and turn the water on full. The water pressure is good, if the jet reaches knee level. If it is higher, you waste a lot of water. The elevated water pressure also harms your skin. In Finland, small grains of sand come with the tap water. If the water pressure is too high, also these little stones harm your skin.
The recommended CO2 level in a room is 700-800. Our team of 7 persons was working in room 305, a small classroom. In a short time, the CO2-level rose to 1200. At these numbers, the air already starts to feel thick and it is not ideal for working.
We will make more CO2 measurements in November-December 2017.
Radiators should be washed from the inside every 5 years, so that the water can run properly through them and they work efficiently. Washing them makes them last remarkably longer.
Temperature and Humidity Level
In the table below you can see the ideal humidity level indoors, which is 40-60%. If the humidity level exceeds this level, the conditions will be ideal for bacteria, fungae and dust mites. This will cause asthma and other health problems. If the humidity level is under 40%, bacteria will thrive and the dry air may be leading to health problems such as asthma, allergies and respiratory infections.
Recommended temperatures for private homes where there is no draught
Living rooms 20-21 ºC
Bedrooms 18-20 ºC
Stairwells in apartment buildings 17-18 °C
Storage 12 ºC
Garage 5 ºC
Lowering the temperature by one degree will save 5% of your energy bill.
The temperature in the canteen is 22 degrees around the clock. It is recommendable to install a temperature regulator, which will set the temperature to 18 degrees at night and on weekends and on 19 degrees in daytime.
The machines in the kitchen produce heat and when the students come to eat, the temperature rises very quickly with the amount of people. This easily creates overheat. The canteen is used for a relatively short time per day, so there is no point keeping the temperature so high at all times
The temperature in the home economics classroom is 21 degrees around the clock. As in the canteen, there are ovens and other sources of heat, which create overheat. The temperature could be reduced to 17 degrees all day round. The classroom will warm up quickly, when it fills up with people and the ovens and other machines are turned on.
Reducing the temperature by 4 degrees will save 20% in the heating costs of this room.
309 English classroom
The temperature in the English classroom is stable around 21 degrees, which ideal. The humidity also stays in the recommended level. The explanation for peaks at the beginning is that the measuring tool was not in place yet, but in someones bag or pocket.
We also made some measurements at home.
The moisture in this bedroom is rather high. While the optimal level is 40-60%, the moisture level is continuously around and even above 60%. Under these conditions textiles might begin to mould and it will affect the health of whoever stays in the room. In order to find out the source of moisture the Energy consultant would make very minutious interviews about the room and building itself and about the living habits of the inhabitant. For example, do they dry laundry inside? Do they bring wet coats into the room? Are there a lot of plants or are there pets?
In this bedroom, the moisture level peaks at times. In order to improve the air quailty it is essential to pin down the reason. Does the steam come e.g. from showering, cooking, drying laundry?
Electricity consumption 2013-2017
The electricity consumption has remained quite unchanged in the observed time period. Some peaks or lower levels can be explained with changes in holiday times. During the summer break the energy consumption hits the bottom.
There is a significant change in progress: Computers are being used more and more during class. It might be interesting to see what the development is in the next 5 years.
The follow-up plan is to make measurements to see how much electricity different device consume (while being used, on standby…) and if there are ways to save energy.
District heating 2013-2017
The consumption of district heating has been quite unchanged during the observed period.
Ekokumppanit suggests that we continue our co-operation and finish what’ve started at our school. They’re interested in making our school a model for others. Two energy consultants would come to the school to take measurements and the Erasmus-group and anyone else interested could join, learning what they do and how. These will be done when the outside temperature is max 5 degrees, in November or December. The whole school will be informed about the ongoing project and everyone will participate through answering questions about the air quality etc. Together with the energy consultants the Erasmus-group could make a presentation about the progress, which would be held for the whole school. An exhibition could also be placed at the school hall with different measurements from the school and what they mean.
We could measure how much energy the electronical devices consume in use and standby.
We could measure how efficient the lights are and are they suitable for studying or too bright/dim.
We will be doing more and more precise measurements in order to find leaks.
The consultation won’t be free, but it will pay itself back.