|
|
re: cool tower alternatives
29 nov 2005
abby normal wrote:
>> >>... evaporative cooling gives more btu/lb of water in cooler night air.
>> >
>> >how so...
>>
>> you've seen the numbers...
>
>what numbers
my very first post on this subject, appended.
>> >if your system was designed for the peak outside temperature, you could shut
>> >it off at night.
>>
>> that would use more daily water.
>
>yes and it will at least maintain the condition. your scheme cannot
>maintain the condition.
yes, it can, if you want to use more water over a day's time, but
turning it off in the hottest part of the day can save water with
no loss in comfort.
>> that's a more efficient direction. davis energy systems has an evaporative
>> system that switches from swamp cooling to dry ventilation at night, at
>> http://www.carb-swa.com/pdf%20files/cnnovember05.pdf, but a damp slab can
>> lose more heat to room air than a dry slab, at the same air temp, with less
>> airflow, since its effective air film conductance is a lot higher.
>
>or you just open the windows at night.
that requires a lot more slab and insulation and airflow.
>> >> >> a swamp cooler with appropriate controls could do exactly the same thing
>> >> >> as the indoor scheme, with the same water and airflows.
>> >> >>
>> >> >> >a swamp cooler would be 500 cfm, 12.2 pounds/hr...
>> >>
>> >> no. exactly the same as the indoor scheme, if ideally controlled.
>> >
>> >well, what can i say, if a swamp cooler would have beat your system
>> >under the microscopic load, i would have been the first to tell you.
>>
>> exactly the same, vs "beat," but it appears you still disagree with that.
>
>no nick, not the same amount of water.
no abby, exactly the same, or less.
>... your system can only keep up when it is at an average temperature.
that is incorrect.
>because it indirectly deals with the outside air and adds this hot air
>directly to the space it is inherently flawed and will need more water
>and a higher exchange of air than a swamp cooler will.
i disagree. an assertion demands no more than a counterassertion :-)
>... a slab in contact with 42 degree soil collects so much heat...
collects or loses? who cares, in the southwest?
i suggest you open your mind and examine the numbers.
nick
|
|
