Ventilation loss with exhaust air heat pump?

[carlbanan]

Yes, as the title says. Is there anyone who can explain how to calculate the heat loss for ventilation if you have a flvp? Alternatively, if you can use an efficiency similar to a heat exchanger (ftx system). I have already calculated airflows and turnovers, but the final part is missing.

 

[Ewald]

Can you measure the air temperature before and after FLVP?

 

[Ewald]

According to NIBE Germany, the exhaust air is cooled down to approx. 0 °C.

http://www.nibe.de/nibedocuments/14174/M10941-5.pdf

A NIBE exhaust air heat pump uses the heat energy contained in the exhaust air for building heating and domestic hot water preparation. The warm exhaust air with, for example, 20 °C is passed through a heat exchanger (evaporator) and cooled down to just above 0 °C before it is released outside.
In Austria, they said that the exhaust air is cooled down by about 15 - 20 K. So if you have an indoor air temperature of 20 °C, it is cooled down to about 0 - 5 °C.

If you have a given airflow, you can then calculate the ventilation losses, I would say.