Date: Mon, 30 Jan 2012 13:25:57
Author: --- Jerry
Subject: Re: Energy Conservation Via Windows and Blinds
In winter-prone areas, if you have water pipes around the exterior of
the building or inadequate insulation, 40 deg might not be warm enough to
prevent frozen pipes. Also, it can take a while to warm up a building from
40 deg, productivity might be low in the morning...
At 1/30/2012 11:33 AM, you wrote:
>What I don't get is the part about 60deg F or less. If you're not going
>to be around, why not lower the thermostat to 40 just to keep things from
>freezing? That would make a much bigger difference than opening or closing
>shades, no? If you are going to be around, then you can open shades during
>the day and close them when you leave. Forgive me if I'm being ignorant,
>I do live in CA.
>Brian Holton wrote:
>>Blinds usually aid in insulation, if for nothing other than trapping air
>>between the blind and the window. In my old house, I shopped for shades
>>that actually had a significant R value, not to mention they provided
>>somewhat of a convection barrier. Generally, I always thought that
>>institutions wanted the shades up during breaks for security reasons,
>>this is the first I have ever heard of green reasons. The heating
>>argument doesnt seem to make much sense, but you know, sometimes you have
>>to let people believe what they believe, even if you know what is true.
>>I know in my house, if I do not pull the curtains at night the house is
>>considerably colder at night. If I leave the curtains closed during the
>>day the house is also colder unless the sun is not out.
>>IN the summer keep the curtains closed during the day and open at night,
>>Only ran the AC for 3 days last summer
>>On Thu, Dec 22, 2011 at 8:00 AM, Bill Alexander wrote:
>>You need to do an experiment. Convince them to let you monitor several
>>rooms, thermostats set the same, w/ blinds open or closed.
>>On Thu, Dec 22, 2011 at 6:48 AM, Bill Norwood wrote:
>>Here is an excerpt from our winter break energy conservation admonition:
>>When you leave for break, please remember to help the university conserve
>>energy. . . . Lower personal thermostats to 60o F or less. Close and
>>lock windows and doors, but leave blinds or shades open on windows
>>reached by the sun's warmth.
>>. . .
>>-But for me the question is whether the heat lost at night, due to lost
>>reflection from venetian blinds and increased conduction at the windows,
>>might exceed the heat acquired during the daytime.
>>-And the inside-outside temperature differential at night might be
>>greater in winter in Maryland and north.
>>-And, its different scale and geometry, but there is no question that the
>>extremely hot interiors of cars in summertime are hot no more, soon after
>>Thanks for any thoughts.
>>Bill Norwood, U of MD at College Park