Efficiency of heat recovery units in ventilation
Koroleva, Anastasiia (2012)
Koroleva, Anastasiia
Mikkelin ammattikorkeakoulu
2012
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Julkaisun pysyvä osoite on
https://urn.fi/URN:NBN:fi:amk-201301311891
https://urn.fi/URN:NBN:fi:amk-201301311891
Tiivistelmä
The main aim of my bachelor thesis was to calculate the annual efficiency and the temperature ratios of the heat recovery unit and compare them with the manufacturer’s data and requirements of European standards. Another aim was to estimate the influence of using the heat recovery unit on heat energy consumption of the air handling unit. Furthermore, the aim was to compare real costs of heat energy for the air handling unit with the heat recovery unit with costs of heat energy which would be if there wasn’t the heat recovery unit in the air handling unit.
The air handling unit with the heat recovery unit which is located in D-building of Mikkeli University of Applied Sciences was chosen for research. The type of the heat recovery unit is a heat recovery unit with a rotating wheel. The research is based on data which was obtained from the measuring devices of the handling unit. The calculations of the annual efficiency and the temperature efficiency of the heat recovery unit were performed according to EN308 and other reliable sources.
The main result of the research is that the heat recovery has high annual heat recovery energy efficiency for supply air (77,3%) and high temperature efficiency for cold months (the maximum value is 83,4% on the 3th of January, 2011 at 9:00). Comparing with manufacturer’s data wasn’t successful because the manufacturer’s data was obtained in different conditions compared with conditions of the research. There isn’t any information about the annual efficiency and the temperature efficiency of the heat recovery unit in European standards. So the comparing with standards was impossible. Another result is that using the heat recovery unit really lead to save the heat energy for the air handling unit (by 119 MWh per calculated year) and significantly reduced costs of heat energy (6559 EUR were saved). At the same time the annual heat energy consumption of the coil was 35,1 MWh per year and the annual heat energy costs were 1930 EUR per year.
The air handling unit with the heat recovery unit which is located in D-building of Mikkeli University of Applied Sciences was chosen for research. The type of the heat recovery unit is a heat recovery unit with a rotating wheel. The research is based on data which was obtained from the measuring devices of the handling unit. The calculations of the annual efficiency and the temperature efficiency of the heat recovery unit were performed according to EN308 and other reliable sources.
The main result of the research is that the heat recovery has high annual heat recovery energy efficiency for supply air (77,3%) and high temperature efficiency for cold months (the maximum value is 83,4% on the 3th of January, 2011 at 9:00). Comparing with manufacturer’s data wasn’t successful because the manufacturer’s data was obtained in different conditions compared with conditions of the research. There isn’t any information about the annual efficiency and the temperature efficiency of the heat recovery unit in European standards. So the comparing with standards was impossible. Another result is that using the heat recovery unit really lead to save the heat energy for the air handling unit (by 119 MWh per calculated year) and significantly reduced costs of heat energy (6559 EUR were saved). At the same time the annual heat energy consumption of the coil was 35,1 MWh per year and the annual heat energy costs were 1930 EUR per year.