[Greenbuilding] Central vs window AC

[Gennaro Brooks-Church - Eco Brooklyn]

In NY at least, when it is hot, it's humid. Night ventilation, like
fans, work in lower hot temperatures here but when it gets really hot it
stops working comfort wise. You're just stirring the soup at that point.
Some days the AC is almost needed more for its humidification than for its
cooling.

Gennaro Brooks-Church
Director, Eco Brooklyn Inc.
Cell: 1 347 244 3016 USA
www.EcoBrooklyn.com
22 2nd St; Brooklyn, NY 11231



On Fri, Jun 8, 2012 at 1:25 PM, nick pine <nick at early.com> wrote:

> John Straube writes:
>
>  ... consider the humidity. At night, since it cools down, the RH rises.
>> Flooding a house with 68F/80-90%RH air loads the house up with vapor in all
>> the drywall, wood, furnishings.  The next morning even if the temperature
>> stays low (say 76 or 78) the RH in the house will be uncomfortably high. If
>> you have more mass (lots of exposed concrete ceilings for example) the
>> concrete stays cool enough that you can get condensation on the ceiling. I
>> have seen this happen in old masonry warehouses .
>>
>
> To me, smart ventilation considers absolute humidity, with ventilation
> only on cool dry nights when the result would be comfortable. Flooding a
> house with dry air can store dryness in the same way that thermal mass can
> store coolth. Concrete absorbs 1% of its weight by moisture as the RH rises
> from 40 to 60%.
>
>
> Nick
>
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