Hmmmm. If you study attic/roof venting, it is more complex than one imagines. There's all sorts of warnings NOT to mix different vent systems, I.E., ridge vent system with gable or power vents. It can disrupt effective airflow. The ridge/soffit vent system works on the principle you have a sealed attic. Cooler air enters the soffit and exits the ridge, removing the heat accumulating between the rafters at the roof underside surface.
Air flow takes the path of least resistance. You stated you have a large access opening into the loft, which might negate the effectiveness of the ridge vent, air flow pattern, heat management, whatever. This might be the crux of your issue and the ridge vent/large loft opening simply is not an effective design. Air might be flowing directly up through your loft entrance (chimney effect) and directly out the ridge vent without pulling hot air out of the rest of your loft/attic.
https://ventilation-maximum.com/en/guide-to-attic-ventilation/#other
The challenge is what is the solution? In some greenhouses we use Horizontal Air Flow (Haf) fans to circulate the air bathtub fashion:
Maybe mixing the loft air would get better results? Mixing combined with different exhaust design vs. ridge???? Tough to know. There must be some design engineers that know the answer.
Air flow takes the path of least resistance. You stated you have a large access opening into the loft, which might negate the effectiveness of the ridge vent, air flow pattern, heat management, whatever. This might be the crux of your issue and the ridge vent/large loft opening simply is not an effective design. Air might be flowing directly up through your loft entrance (chimney effect) and directly out the ridge vent without pulling hot air out of the rest of your loft/attic.
https://ventilation-maximum.com/en/guide-to-attic-ventilation/#other
The challenge is what is the solution? In some greenhouses we use Horizontal Air Flow (Haf) fans to circulate the air bathtub fashion:
Maybe mixing the loft air would get better results? Mixing combined with different exhaust design vs. ridge???? Tough to know. There must be some design engineers that know the answer.
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