[Bldg-sim] FW: insulation hot humid climates

Abaza Hussein ahussein at spsu.edu
Tue Feb 23 16:13:58 PST 2010


Aushim;
do you have any pictures of the exising hospital so we can better understand the structure.
thanks

----- Original Message -----
From: "Umesh Atre" <umesh at innovativedesign.net>
To: "BldgSim Mailing List" <bldg-sim at onebuilding.org>
Cc: brianuher at gmail.com
Sent: Tuesday, February 23, 2010 5:12:27 PM GMT -05:00 US/Canada Eastern
Subject: [Bldg-sim] FW:  insulation hot humid climates



  


From: brian uher [mailto:brianuher at gmail.com] 
Sent: Monday, February 22, 2010 10:17 PM 
To: Umesh Atre 
Subject: Re: [Bldg-sim] insulation hot humid climates 


Aushim, 

Great Project. 

I do not know if this is at all helpful, but when we think about latent load even in the southern U.S., we focus on air tightness and pre-dehumidification of incoming air.  

Ground coupled PEX tubing into a pre-chiller on the ERV intake (basically a car radiator type gizmo, pump 1/4 hp, water in tubing at ground temp (go deep with picks and shovels...), no heat pump), ERV (25 watts per 2000 SF) can create a steady flow of fresh air and probably get the temp. down to 85F and control humidity.  Positive pressure flow (0.5 Pa) to the interior to keep out humidity when doors open frequently.  American retail for the pre-chiller is $250 U.S. ; the ERV is $1800 U.S.Both the ERV and pump can be DC powered.  The intake on the ERV is MERV 12 filtered (so you are two away from MERV 14 or hospital standard...reduces the burn rate on MERV 14 filters) , the MERV 12 filters can be removed and hand-washed.  Sealed bearings (no dust effect), self-balancing.  It is 96% efficient on the sensible heat exchange, 40% on the latent exchange.  We know the head engineer, they will love this project. 

Skin the brick with wood spacers and corrugated metal (1" spacing - like a vented rain screen - Bernoulli effect through the corrugations - vertical venting),  air tighten the single pane windows, big overhangs (check the depth here: http://susdesign.com/tools.php ) and a layered roof strategy (say, 3 layers, perpendicular to one another, corrugated metal with wood spacers...again, Bernoulli affect)... 

Use air to create the insulation...give me a week to run a Passive House model and give you rough sawn numbers on wall assemblies...I take it you really need this bare bones and repairable...but it is critical to control the air flows through the envelope...do that, and you have a fighting chance to make something amazing. 

PS - dimensions? aspect ratio? how many floors? window percentage? do you plaster the interiors? orientation? 

Brian 


Brian Uher, MS, MSE 
Managing Partner 
Amicus Consulting Services 






On Mon, Feb 22, 2010 at 5:03 PM, Umesh Atre < umesh at innovativedesign.net > wrote: 




Aushim, 
  
I would direct you to this website: http://www.hothumidsymposium.org/ 
  
Per my knowledge, you can access a lot of the past symposium proceedings by visiting the following Texas A&M ESL web-link: 
http://esl.tamu.edu/pub/HH%20Catalog2.pdf 
  
Maybe you will come across something that helps with your specific project, 
Best of luck! 
  

  

From: bldg-sim-bounces at lists.onebuilding.org [mailto: bldg-sim-bounces at lists.onebuilding.org ] On Behalf Of leen peeters 
Sent: Monday, February 22, 2010 4:20 AM 
To: bldg-sim at lists.onebuilding.org 
Cc: Aushim Koumar 
Subject: [Bldg-sim] insulation hot humid climates 



Dear all, 
  
for a student project, we are studying the options for improving the thermal comfort in a hospital located in Bangladesh. The aim is to use as much cheap and local materials as possible.   
They currently use simple metal non-insulated constructions. We will go there and build a extension to an existing hospital. The idea is to use bricks for the walls, wooden doors and single glazing. However the roof remains in metal. We have a small budget for improving the indoor climate, however have no experience in insulation in these climates. 
  
We would appreciate anyones help; references to reports, publications or some usefull advice. 
  
Kind regards, 
  
Aushim 
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