Hello,
We built a passive house and moved in around Easter. Unfortunately, we experienced an almost unbearable summer. Despite shading, the indoor temperature stayed above 26°C (79°F) almost continuously, even at night.
We have a ventilation system from Paul (Novus 450) with an active ground-source pre-cooling feature. The ventilation is not yet properly adjusted; it currently operates at about 30% higher airflow than necessary. The problem is that no matter the supply air temperature, the vents deliver roughly 0.5°C (0.9°F) less than the room temperature. Even with the active bypass engaged and supply air reduced to 16°C (61°F), the room temperature remains at 22.9°C (73°F) (our current indoor temperature without additional heating is 23.5°C (74°F)). The technician measured the values and said it was not optimal but still acceptable. However, I find that hard to believe, since we are sweating every night and don’t even get cooler air into the house overnight. Has anyone experienced something similar? Thanks for any help...
Best regards,
Thorsten
We built a passive house and moved in around Easter. Unfortunately, we experienced an almost unbearable summer. Despite shading, the indoor temperature stayed above 26°C (79°F) almost continuously, even at night.
We have a ventilation system from Paul (Novus 450) with an active ground-source pre-cooling feature. The ventilation is not yet properly adjusted; it currently operates at about 30% higher airflow than necessary. The problem is that no matter the supply air temperature, the vents deliver roughly 0.5°C (0.9°F) less than the room temperature. Even with the active bypass engaged and supply air reduced to 16°C (61°F), the room temperature remains at 22.9°C (73°F) (our current indoor temperature without additional heating is 23.5°C (74°F)). The technician measured the values and said it was not optimal but still acceptable. However, I find that hard to believe, since we are sweating every night and don’t even get cooler air into the house overnight. Has anyone experienced something similar? Thanks for any help...
Best regards,
Thorsten
I cannot understand the comments. If you have a brine-to-air heat exchanger for active cooling before this point and the bypass is working, cool air must be flowing out. In the short duct, nothing can warm up.
We have a ground heat exchanger, and theoretically, in summer, 12-16°C (54-61°F) cool air should be coming through.
The fact that the air's storage capacity is so low that no miracles can be expected is a different matter. But at the outlet, you should be able to measure cool air.
We have a ground heat exchanger, and theoretically, in summer, 12-16°C (54-61°F) cool air should be coming through.
The fact that the air's storage capacity is so low that no miracles can be expected is a different matter. But at the outlet, you should be able to measure cool air.
Thorsten_J14 Oct 2017 07:05That’s what I thought too. The supply air reaches about 16°C (61°F) after maximum cooling, 17.5°C (63.5°F) arrives at the air distributor after the bypass, and in the living room, after the short double-walled duct with a flow rate of about 15m3/h (9 cubic feet per hour), the temperature is around 23°C (73°F) now and almost 26°C (79°F) in summer.
S
Steffen8014 Oct 2017 08:36If you don’t want your modern house to get warm during the summer, install a proper air conditioning system. We’re not the only ones here who have done that.
You could probably add one afterwards… it should be possible.
You could probably add one afterwards… it should be possible.
@TE
No, your basic understanding is incorrect... the heat exchanger is primarily intended for winter use to save heating energy... and it works quite well... a gain of 15-20°C (27-36°F) is typical.
The bypass is for summer, but it’s just a single flap... warm outside air enters the warm system and passes through the warm house... without active cooling, it simply can’t produce cooler air.
It is a ventilation system, not an air conditioner... its primary function is to extract used air and supply fresh air. That is all these systems do, nothing more and nothing less.
No, your basic understanding is incorrect... the heat exchanger is primarily intended for winter use to save heating energy... and it works quite well... a gain of 15-20°C (27-36°F) is typical.
The bypass is for summer, but it’s just a single flap... warm outside air enters the warm system and passes through the warm house... without active cooling, it simply can’t produce cooler air.
It is a ventilation system, not an air conditioner... its primary function is to extract used air and supply fresh air. That is all these systems do, nothing more and nothing less.
Thorsten_J15 Oct 2017 08:15OK, thank you very much, I was really expecting more, especially since the manufacturer’s statement (Paul) about the ventilation system says that the typical warming of the supply air throughout the entire system up to the outlet is about 1-2 degrees Celsius (34-36°F). So nearly 10 degrees Celsius (50°F) seems quite high to me. However, if it’s like this for everyone, then it apparently is just how the system works.
Similar topics