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Posted by daestrom on November 19, 2006, 6:19 pm
 


Nick, like many of your 'calculations', you use simple averages and assume a
lot.

Rochestor is very near Oswego (where I live).  While the statistical
*average* temperature swing may be what you've assumed, it is far from
common.  Temperatures during the day often reach into the mid-90's in
July/August.  A two-week long 'heat wave' that gets into the 90's every day
and stays above the 70's at night is very typical each summer.  When
considering buying A/C, I wrestled with this.  The 'averages' say it
shouldn't ever be very uncomfortable, yet the truth is different than the
'averages'.  Sure, some years the daily highs are rather modest and only get
up to the mid 80's, but other years are 'killer' heat waves into the high
90's.

daestrom


Posted by nicksanspam on November 19, 2006, 7:13 pm
 


Sure. This house should have a window AC or a stratified tank
for non-average July days.

Nick


Posted by Solar Flare on November 20, 2006, 2:49 am
 Daestrom talks about a typical summer here. This has happened from
June 12 to October 1 one year. You ain't gonna' keep the cool that
long.



Posted by daestrom on November 21, 2006, 8:33 pm
 

With weather around here, two weeks out of the year you have 'uncomfortably
hot' weather.  Often we just *manually* ventilate (i.e. open a window).  Has
lots of other benefits too.  Manually shutting the windows in the morning,
avoid large heat-generating activities (oven, dryer) and it can stay
comfortable till afternoon.  In all but the 'heat wave' fluctuations, no
special equipment needed.  Opening five 'double-hung' windows on first
floor, and five more on the second floor.  More flow than your setup, and
able to capitialize on the prevailing breeze.

BTW, your time-of-day temperature in line 140 seems a bit odd. It reaches
maximum at hour 6 and minimum at hour 18.  You might try...

140 Tp.2+(80.7-70.2)*SIN(W*(H+8))'outdoor temp (F)

instead so that peak temperature at least occurs in the afternoon (when I
look at my local recorded temperature, the air temperature peaks between
1400 and 1500 most summer days, and minimum around 0400, barring any weather
front moving into the area).

Nor do I see any solar-gain.  This seems like a major oversight.

BTW, we (and Rochester) enjoy a significant tempering effect from the large
body of water on our shore.  Here in Oswego, we are routinely several
degrees (up to 10F) cooler than Syracuse (50 miles inland, nearest NWS
station).  Of course, the same body of water has some other side-effects at
other times of the year (e.g. can you spell 'lake-effect snow band'??).
Staying comfortable in the summer is no serious feat in this climate.  Try
Albany NY or Detroit MI (about the same latitude).  Without a tempering body
of water, their extremes are much more severe.

daestrom


Posted by nicksanspam on November 21, 2006, 9:40 pm
 

Yeah. You missed it :-)

Nick


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