[Bldg-sim] FW: insulation hot humid climates

Umesh Atre umesh at innovativedesign.net
Tue Feb 23 14:12:27 PST 2010


 

________________________________

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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