Hope somebody will have some words of wisdom and clarify this matter for me.
I am building a studio in a ex wine cellar basement on the mediterranean coast. The house is over 100yr old and walls are made of 55cm stones. On the north side i am 180cm bellow the ground and on the south i am some 60 cm bellow ground level.
So far i made hydro isolation, acoustic isolation (partly walls and complete ceiling). Total space is 50m2 and it is divided in control room (21 m2) and the studio.
Control room is totally surrounded by an isolation shell made of layers of stone wool and gypsum while the studio part is left as it is with nice stone walls, gypsum ceiling and parqueted floor.
When i installed all doors, i realize that (because of totally hermetic conditions) humidity is much higher then i expected (i have had no knowledge about vents, humidity, relationship with aircon, temperature etc...).
Now, on a normal dry mediterranean weather, upon coming to studio (to be) i find around 55-60% Rel.Hum. and after 20 minutes with open doors (i have big double wing glass doors that seals perfectly) rel.hum. falls to 40 or even 35%.
When we have winds from the south and/or rainy days i find as high as 65 to 70 %.
Thats not really good for my piano and guitars as well as electronics that are going to be placed. Again, after opening the doors wide open, i see hygrometer falls to 60 or 55%.
I am getting in a few days multisplit inverter system with inner Mitsubishi MSZ GE25 and MSZ GE35 aircon units. One for CR, other for studio.
For ventilation, i have installed already intake and outtake canals that are waiting for the rest, or should i say, the heart of the vent system.
The guys from the local HVAC business offered me normal 2x ventilators to push air in and out, but as my concern raised high, i learned via www about Mitsubishi Lossnay systems that are actually recuperators (energy recovery systems) and can be totally integrated with Mitsubishi aircon units.
I plan both, aircon and Lossnay, to be installed with weekly timers, so system can run for a few hours every day even if i am not around.
Here are my questions:
1. It seems to me that my humidity problem is rather dependent on the outside weather and not exclusively as a product of humidity source within the studio (yes, north wall is 180 cm bellow the ground out of the 305 cm, i am aware of that). Hydro isolation is done properly and i have kind of floating floor above it (parquet on armed concrete estrich floated on the stone wool).
2. As it seems to me, problem is that humidity collects when nothing is open, because all doors are totally sound proofed. So, problem is there when i am not around, which means that humidity jumps up when i am not present and jumps down when i am in. Is this "jumping" better or worse from all time high humidity?
3. How much help will provide aircon system? Is drying mode really drying or it is kind of marketing bluff? It will dry to some degree, but will it help?
Provided that it comes with a weekly timer, so it will run independently of my presence.
What would be the best setting for drying? Temp. in studio is mainly around 25Cdeg during summer, almost a constant and around 15-20 Cdeg during the winter.
4. Anybody familiar with Lossnay system? Here is the link http://www.mitsubishielectric.com.au...AY_LGH_RX5.pdf
On the top of a page nr. 2 they talk about humidity.
As i understand, this unit can be a great saver of money on electricity bill later on and it should help with humidity as well... Was thinking about unit LGH 25RX5, it is for up to 250m3, and as my space is some 150m3 this should be good (i have intake and outtake only in CR but i'll keep doors btw CR and studio open when not there).