I'm an Italian architect and I'm planning an experimental bioclimatic nZEB for Mediterranean climate with high thermal mass  and capacity internal, (inertia between 13-21 hours), superinsulation with Periodic Thermal Transmittance< 0,002 W/mqK  (U-values wall= 0.13 W/mqK, U-values roof= 0.18 W/mqK, U-value ground floor = 0,30 W/mqK,  U-value of windows: 0,80 W/mqK), automatic shading and sunscreens, construction without thermal bridge, good air tightness, etc. But I have great doubts about the mechanical ventilation heat recovery balanced flow for the following reasons:
1) the lack of sustainability of the MVHR system (footprint and CO2 emissions): I can recommend the book: http://www.sciencedirect.com/science/article/pii/S0378778812002071
2) from some research I've done, there is some risks to health in passive house with MVHR: the air flow that passes from the channels and the filters causes poor indoor air quality and increased of bronchitis, tiredness, frequent colds, etc): I can recommend  a research about this:
http://0co2.wordpress.com/2012/05/06/health-risk-associated-with-pa...
3) the real efficiency of heat recovery systems: the user doesn't keep the air-filters completely and regularly cleaned with consequent losses of load;
4) in warm climate I don't think that is short the return on investment (because  I have to install also an air conditioning systems for the summer);
5)  there are some research in Mediterranean climate zones or warm climate area (Passive-On, Passive House California standards, etc) which don't exclude the use of conventional mechanical ventilation without heat recovery.
For these reasons I  thought of using  a little heat pump  (heating-cooling air/air or air/water no radiant flooring but multi-split with solar panel and photovoltaic) combined with conventional mechanical (exhaust) ventilation with natural inlet functions, without heat recovery (CV): ie a single-flow ventilation in which the intake of air takes place via simple wall or windows fresh air inlets (hygro-adjustable no channeled easy to clean ),  while only the extraction duct is channeled and connected  to an extraction machine. (type bahia compact- microwatt Aldes). 
Can give me some examples of Passivhaus buildings, in warm or temperate climate, without heat recovery system?
Do you know some indipendent or epidemiological research about the quality of MVHR air and CV air?
Hoping for your help !!!

Tags: MVHR, Mediterranean-climate, Passivhaus, casa-passiva, heat-recovery-system, high-energy-efficient-Buildings, indoor-quality-air, mechanical-ventilation, nZEB, natural-ventilation, More…net-zero-energy-building, passive-house

Views: 194

Attachments:

Reply to This

Home Energy Pros

Home Energy Pros was founded by the developers of Home Energy Saver Pro (sponsored by the U.S. Department of Energy,) and brought to you in partnership with Home Energy magazine.

Latest Activity

Aaren Stewart posted a discussion

Let's solve this HVAC quiz!!!

Answer these three simple problems of your HVAC systems, let's see how much you know your system…See More
4 hours ago
Chris Laumer-Giddens posted a blog post

Mini-Split Heat Pumps are Quirky, Especially their Capacity

Mini-Split Heat Pumps are Quirky and Still EffectiveThe name "mini-splits" generally refers to heat…See More
13 hours ago
Jan Green posted an event

Solar Course for Appraisers at SRP's Pera Club

November 13, 2014 to November 14, 2014
"As the US continues to search for energy alternatives, properties improved with solar PV…See More
13 hours ago
Hal Skinner replied to Hal Skinner's discussion What an RCC can do with no R- insulation in the walls.
"Just like paint.  RFoller and brush or strong airless sprayer.  It has the consistency of…"
16 hours ago
Hal Skinner replied to Hal Skinner's discussion What an RCC can do with no R- insulation in the walls.
"ty and thermal emission leveld of many materials including bricks and white paint.  They do…"
17 hours ago
Hal Skinner added a discussion to the group The RCC Classroom (Radiant Control Coatings)
Thumbnail

Walmart goes green in Texas

We applied cour RCC to 5 Walmart superstores in Texas.  Worked great and they wanted it.  Then they…See More
17 hours ago
Kim Tanner replied to Trip Smith's discussion Where to spend my marketing dollars?
"Direct mail doesn't do very much, in my opinion, unless you have awesome coupons! Honestly,…"
17 hours ago
Hal Skinner replied to Hal Skinner's discussion What an RCC can do with no R- insulation in the walls.
"Mornn Trip and Bud, In this case all I can do is report it exactly as it was told to me.  I…"
18 hours ago

© 2014   Created by Lawrence Berkeley National Laboratory.

Badges  |  Report an Issue  |  Terms of Service