Posted by yatseck on November 12, 2004, 12:24 am
preface: i'm not a professional, not even close. i'm new to the
subject of passive solar systems in architecture. my faculty
(architecture at the warsaw (poland) university of technology) doesn't
provide any, or very little and outdated information (forget about
courses for students on greendesign, ecohousing, etc. it's just not
popular in our country. yet, i hope) on renewable enrgy sources in
architecture, so please forgive me my dilettantism and lack of
up-to-date knowledge on the subject (question2).
question1: i'm currently working on a architectural (semstrial (3sem))
project for a single family house. location:low intensity urban site
in warsaw. a square lot (25m x 25m = 125m^2, which is 16,4' x 16,4' =
268 square feet). in proximity: two story houses from the E, SE and S,
shading my flat significally in the winter season (poland->temperate
climate, long-lastnig periods of cloudy days do happen).that's why
i've decided to place the passive indirect or isolated gain (not sure
yet) solar systems on the second floor of my building. what types of
air circulation system would be the best to use in order to provide
warm air to the lower story?
question2: i've been thinking about making a modification to the,
already modified, trombe-miachel wall, which consist of a row
(oriented W-E, south exposure) of thermal mass short walls/rectangular
pillars rotated at an angle of -45deg. (longer side to SE - providing
shade in morning hours and warming up, and letting the evening sun
inside). what if the wall was a huge waterglass, instead of opaque
brick/concrete? methinks: better thermall storage, transparency, and
the opportunity to empty the wall before a long period of cloudy days
in order to avoid the reversed thermall process=heat loss.
is this stupid, silly, or just naive? i'd be really grateful if you'd
give me some advice and maybe aid me in some way, i.e. reccomend some
good sites on the subject.
thanks a lot,
best regards from poland to all,
Posted by News on November 12, 2004, 12:58 am
This appears to be a large solar panel collector on the side wall. Much
cheaper to convert the whole roof to a full solar collector or install
individual panel on the existing roof, as the roof angle is better suited
Posted by nicksanspam on November 12, 2004, 12:36 pm
As in the solar attics of Soldier's Grove, Wisconsin, which have
steep south transparent (fiberglass, which might be a single layer
of corrugated polycarbonate greenhouse roofing material, these days)
roofs and blowers to move warm air down to the lower floors and
motorized dampers to keep the warm air downstairs at night. In some
buildings, the warm air flows under ground floors, through horizontal
channels made by lining-up holes in hollow concrete blocks.
Storing heat in a massy ceiling instead of a floor might require
less blower power and make warmer water. A slow ceiling fan and
room air thermostat and occupancy sensor might keep the room warm
as needed, vs the uncontrolled heat from a cooler floor that can't
be turned off during setback periods.
Posted by yatseck on November 13, 2004, 10:26 am
first of all: great thanks for all replies!
well, i did'n mention anything about a sloping roof. actually, in my
project i'm planning a flat roof above the 2nd floor (corresponding to
the surrounding architecture of 1930' modernism). and i think the
angle of the wall is still better since in poland the sun rises only
to the height of 15degrees in the midday of 21dec. and i don't want
solar collectors standing on the roof because they don't meet my
aesthetic demands :)
one more thing: i'm not sure if i'd explained it right: i'm talking
about a study project, not a real house. so, i don't really have to
worry about the costs..
what's more; this project isn't about passive solar, is about
designing a single family house (a concept project), i decided to use
passive solar, because i wanted to learn something more about theory
and the techniques.
therefore, i've just made up my decision on what thermal storage to
use, and its PCM. inspired by the Ebnat-Kappel project (arch. Dietrich
Schwarz) , i found some info about the technology using parrafine wax
as thermal storage in exterior walls. inter alia:
Posted by N9WOS on November 12, 2004, 2:20 am
A few ideas to throw on the fire.
If you leave it as a brick wall.
Use hollow vertical channels in it wall.
Then pull air through the channels (downdraft)
And blow the hot air out into the lower story.
Use a temperature switch to turn the fans on
When the wall sections get hot.
If you have a water wall.
Use a water circulation system to move the hot water
Into a forced air heat exchanger in the lower story.