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Date: | Fri, 3 Aug 2007 09:33:56 -0400 |
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ISEN-ASTC-L is a service of the Association of Science-Technology Centers
Incorporated, a worldwide network of science museums and related institutions.
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The Children's Museum of Pittsburgh, PA, wishes to construct a cloud
vortex into which the children can walk. The parameters are shown
below. They are looking for help in answering the questions.
WARM WATER VAPER CLOUD
Objective:
* To generate a visible warm water vapor cloud.
* The cloud must be of a low enough temperature that a person
could stand in it.
* The objective of the cloud is to create a raising column of
mist within a tall (about 30') glass sculpture structure.
* The shape of the glass sculpture will generate a vortex cloud.
* The system wants to be as passive as possible.
* The system wants to be as low maintenance as possible.
Site parameters:
* Park near Children's Museum of Pittsburgh PA
* Weather Ambient Temp. 0 F to
90 F degrees
Humidity 10%
to 95%
* A shallow concrete heated vessel below a grating.
Both about 15' in diameter.
The concrete would be heated to the temperature needed to create the
cloud and prevent it from freezing in the winter.
* Steam Condensate lines are available near by.
Pressure
7 to 13 PSI
Temp
140F to 160F
Size
6"
Depth
3' to 6'
Questions:
* What are the parameters needed to generate the warm water vapor
cloud.
* What temperature should the concrete be heated to?
* What should the depth of hot water be?
* What might the evaporation rate be? (For flow rate of Steam
Condensate)
* What distance above the hot water should the grating be in
order to have a safe temperature for the grating (bare feet) or a person
standing in the cloud?
* Should there be make up air brought in below the grating? How
big?
Michael C. Driver PhD
Director of Information Services
Materials Research Society
724 779 3004 x401
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