á Lower Indoor Temperature After Starting Operation of Mechanical Ventilation with Heat Recovery
Created on: 24 Jan 2020 13:15
C
chrisw81
Hello everyone,
On Thursday, our controlled residential ventilation system (Vaillant recoVair 260 E with heat recovery) was put into operation.
We have an indoor thermometer, and since the system started, the temperature has been about 1 degree (maybe a bit more) cooler than before.
It feels noticeably fresher in all rooms (including the unheated ones).
My question is, can the heat recovery unit not warm the incoming air sufficiently? Have you experienced a similar effect?
I understand this might be due to the constant air exchange, but the consequence would be needing to heat more, which seems to contradict the energy efficiency advantage of passive houses.
Thanks for your opinions.
On Thursday, our controlled residential ventilation system (Vaillant recoVair 260 E with heat recovery) was put into operation.
We have an indoor thermometer, and since the system started, the temperature has been about 1 degree (maybe a bit more) cooler than before.
It feels noticeably fresher in all rooms (including the unheated ones).
My question is, can the heat recovery unit not warm the incoming air sufficiently? Have you experienced a similar effect?
I understand this might be due to the constant air exchange, but the consequence would be needing to heat more, which seems to contradict the energy efficiency advantage of passive houses.
Thanks for your opinions.
Mycraft schrieb:
The effect is probably not caused by the controlled mechanical ventilation system, but simply by the unheated rooms, which increase the heating load. The heated rooms just canât maintain their temperature because they also have to compensate for the unheated rooms.
I find that very likely. Try to maintain the same temperature in all rooms connected to the controlled mechanical ventilation system.
If you donât want that, a decentralized ventilation system would have been a better choice.
Hi!
I would also recommend measuring the temperatures.
I have a heat recovery ventilation system running, and here are the values I recorded...
Exhaust air inside: 20.7°C (69.3°F)
Supply air inside: 17.4°C (63.3°F)
with an outside temperature of 6.4°C (43.5°F)
Attached is the temperature profile over the course of the day.
I would also recommend measuring the temperatures.
I have a heat recovery ventilation system running, and here are the values I recorded...
Exhaust air inside: 20.7°C (69.3°F)
Supply air inside: 17.4°C (63.3°F)
with an outside temperature of 6.4°C (43.5°F)
Attached is the temperature profile over the course of the day.
Ventilation causes heat loss. Heat recovery reduces this significantly, better than opening windows for ventilation. However, some heat will inevitably be lost. Therefore, you need to heat or provide sufficient heat supply by other means.
With a new system, it is likely that it has not been balanced yet and tends to ventilate too strongly.
Checking the bypass has already been mentioned.
With a new system, it is likely that it has not been balanced yet and tends to ventilate too strongly.
Checking the bypass has already been mentioned.
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