VM1 Energy Recovery Unit
The VM1 is an air-handling unit that is equipped with a counter-flow plate heat exchanger.
The heat exchanger is manufactured from sea water resistant aluminium. There is no mixing of
air since it has channelled airflow guides. It also has two single inlet centrifugal fans with
forward-curved impellers and maintenance-free EC motors. These can be set individually to
ensure balanced ventilation. In normal operation, the unit has a power consumption of 60W and
the airflow can be adjusted to 120 - 180 m³/h. Normal operational flow is 150 m³/h.
The unit works as a constant air volume (CAV) unit with 3 possible setting, MIN, NORM and
MAX.
According to the manufacturer Systemair AB, the airflow is about 65% at MIN setting compared
to the normal operation flow. The maximum flow has been measured to be around 265 m³/h.
Tests performed by the manufacturer show that a performance up to 90% efficiency [6] could be
achieved. But when using this equipment in hotter and more humid climate the efficiency is
expected to be lower due to the much higher latent loads.
For this system to work as efficient as possible, it is required that the space where it will be used
is as air tight as possible. In this case, the VM1-unit will provide mechanical ventilation instead
of the usual means that is natural ventilation. The heat exchanger makes it possible to save
energy that would have been wasted in the winter and reduce the cooling load due to ventilation
in the summer.
The unit is compact and does not take up a lot of space. It is designed to be installed hanging on
the wall. The dimensions can be seen in appendix A and the unit in figure 1.
When choosing the installation position consideration must be taken that, the unit requires
regular maintenance, filters need changing etc. This particular unit is optimized to run efficiently
for spaces up to 150 m² and if the area is greater, a higher airflow rate can be provided by the
VM2-unit. This type of AHU is normally used in a freestanding house, but for the testing, the
unit is considered to be used for one apartment in a multi-story building. The reason for this
choice is that the multi-story buildings are the most common place where people live in the
selected areas. Usually if there is mechanical ventilation in a multi-story building there is a
central unit that provides ventilation to the whole building.
The VM1 is an air-handling unit that is equipped with a counter-flow plate heat exchanger.
The heat exchanger is manufactured from sea water resistant aluminium. There is no mixing of
air since it has channelled airflow guides. It also has two single inlet centrifugal fans with
forward-curved impellers and maintenance-free EC motors. These can be set individually to
ensure balanced ventilation. In normal operation, the unit has a power consumption of 60W and
the airflow can be adjusted to 120 - 180 m³/h. Normal operational flow is 150 m³/h.
The unit works as a constant air volume (CAV) unit with 3 possible setting, MIN, NORM and
MAX.
According to the manufacturer Systemair AB, the airflow is about 65% at MIN setting compared
to the normal operation flow. The maximum flow has been measured to be around 265 m³/h.
Tests performed by the manufacturer show that a performance up to 90% efficiency [6] could be
achieved. But when using this equipment in hotter and more humid climate the efficiency is
expected to be lower due to the much higher latent loads.
For this system to work as efficient as possible, it is required that the space where it will be used
is as air tight as possible. In this case, the VM1-unit will provide mechanical ventilation instead
of the usual means that is natural ventilation. The heat exchanger makes it possible to save
energy that would have been wasted in the winter and reduce the cooling load due to ventilation
in the summer.
The unit is compact and does not take up a lot of space. It is designed to be installed hanging on
the wall. The dimensions can be seen in appendix A and the unit in figure 1.
When choosing the installation position consideration must be taken that, the unit requires
regular maintenance, filters need changing etc. This particular unit is optimized to run efficiently
for spaces up to 150 m² and if the area is greater, a higher airflow rate can be provided by the
VM2-unit. This type of AHU is normally used in a freestanding house, but for the testing, the
unit is considered to be used for one apartment in a multi-story building. The reason for this
choice is that the multi-story buildings are the most common place where people live in the
selected areas. Usually if there is mechanical ventilation in a multi-story building there is a
central unit that provides ventilation to the whole building.
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