Savings and Better Indoor Air Quality

Customer: Hämeenlinnan Rauhanyhdistys Ry, multipurpose property

The multipurpose property built in 2012 in Hämeenlinna has 1100m2 surface are and 6600 m3capacity. The heating cost in a year used to be 13 000 €. On weekdays the property has a kindergarten and on the evenings and weekends it has association activities.

Achieved benefits:

1) District heating consumption decreased by 35 %

2) District heating standard fees reduced by 66 %

3) Electricity consumption decreased by 15 %

In addition, the indoor air quality has improved drastically which has increased comfort of the people who use the property.

Optimising district heating consumption and standard fees

In this property, improving energy efficiency and indoor air quality started from evaluating different factors impacting the high standard fees of district heating. Energy monitoring reports showed that the heating consumption had significant power peaks. These power peaks were evaluated and they were tracked to ventilation systems and especially to professional kitchen's ventilation system. The ventilation system of incoming air had a powerful heat exchanger and it did not have an exhaust air recovery system. This leads to significant power peaks.

The lack of exhaust air recovery system is in accordance with design guidelines, because the kitchen ventilation is supposed to be used only when needed. Standard ventilation in the building is done by mechanical ventilation with exhaust air recovery system. After all, the kitchen ventilation was used for 12 hours in a day which was caused by a switch that turned the ventilation on for 6 hours at a time. It was first switched on in the morning and for a second time in the evening.

The system was transformed in a way that district heating control and both ventilation systems were taken under monitoring and smart remote control by Talotohtori. The smart remote controlling is based on sensors that were set up in the kitchen which automatically recognised when the kitchen was used and regulated the ventilation based on that data. Also the switch was turned into a new one which had a 30 minute run time.

Assuring safe indoor air quality for building users

Another service put to work was the indoor air quality monitoring. People using the spaces had made variety of complaints about the indoor conditions, but it was challenging to fix anything without data of the actual conditions.

Sensors were installed into the kindergarten's rooms, cafe and the parish hall to monitor indoor air quality. Constant monitoring of temperature, relative humidity, CO2 levels and pressure levels. Sensors were connected to Talotohtori indoor air quality service, which visualises the conditions with a comprehensible way.

One of the most important features is the remote monitoring which allows to monitor and adjust conditions, ventilation and heating regardless of a time and place. This feature makes different processes easy to handle without the need to visit the property.

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