The Effect of Temperature Reduction on Heat Pump Performance
Siaudvytis, Julius (2016)
Siaudvytis, Julius
Mikkelin ammattikorkeakoulu
2016
All rights reserved
Julkaisun pysyvä osoite on
https://urn.fi/URN:NBN:fi:amk-201602092067
https://urn.fi/URN:NBN:fi:amk-201602092067
Tiivistelmä
The Ground Source Heat Pumps (GSHP) in Finland are becoming a more and more popular way to provide buildings with necessary heat. This type of heat pump is usually installed as a main heat source, which covers the total heat demand for both Domestic Hot Water (DHW) and space heating. More challenging process is to heat up the DHW due to the higher temperatures required than for space heating. It leads to the relatively lower operational efficiency of the heat pumps.
In order to improve the efficiency of the GSHP the desired DHW temperature to produce must be re-duced. However, the temperature reduction is quite limited because of the health risks. The Finnish National Building Code D1 and Decree of Housing Health states that the heat source must produce the DHW of 55 °C ant the water temperature in the farthest tap cannot be lower than 50 °C.
Therefore, in this study was decided to reduce the DHW temperature by 4 °C, based on requirements. This change of temperature allows to analyze how the Ground Source Heat Pump performance may be improved. Furthermore, the investigation will include such aspects as the noise produced by GSHP and how it will affect the surrounding living environment. Not only the performance will be analyzed, but the potential risks of Legionella survival as well. Overall, the combination of Ground Source Heat Pump performance and the water temperature quality analysis will give a clear view by the advantages and drawbacks.
In order to improve the efficiency of the GSHP the desired DHW temperature to produce must be re-duced. However, the temperature reduction is quite limited because of the health risks. The Finnish National Building Code D1 and Decree of Housing Health states that the heat source must produce the DHW of 55 °C ant the water temperature in the farthest tap cannot be lower than 50 °C.
Therefore, in this study was decided to reduce the DHW temperature by 4 °C, based on requirements. This change of temperature allows to analyze how the Ground Source Heat Pump performance may be improved. Furthermore, the investigation will include such aspects as the noise produced by GSHP and how it will affect the surrounding living environment. Not only the performance will be analyzed, but the potential risks of Legionella survival as well. Overall, the combination of Ground Source Heat Pump performance and the water temperature quality analysis will give a clear view by the advantages and drawbacks.