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re: any white dust free, cool mist, low maintenance humidifier?
15 oct 2002
rich andrews   wrote:
 
>>>water vapor is not a liquid.
 
>> an excellent thought. that is my understanding as well.
 
>> say rich's reasonably airtight 32x32x16' house with 1 ach leaks 393k
>> ft^3/day (273 cfm) of 70 f 50% air to the outdoors. it weighs
>> 0.075x393k = 29.5k lb and contains 0.00787x29.5k = 232 pounds of water
>> vapor. the air that flows in contains 0.0025x29.5k = 74 pounds of
>> water vapor on an average 30 f january day in phila...
>> 
>> rich can either 
>> 
>> a) add 232-74 = 158 pounds of water per day to the house air at a cost
>> of 158k btu, and also heat 273 cfm of 30 f air to 70 f, at a cost of
>> about 24h(70-30)273 = 262k btu, for a total of 420k btu/day (about 4
>> gallons of oil per day), or
>> 
>> b) caulk the house to 0.5 ach, and humidify it with a machine that
>> evaporates 79 pounds of water per day at a cost of 79k btu, and heat
>> 137 cfm of 30 f air to 70 f at a cost of about 24(70-30)137 = 131k btu,
>> for a total of 210k btu/day (about 2 gallons of oil per day), or
>> 
>> c) caulk the house to 0.5 ach, sprinkle water on the basement floor as
>> needed to keep the house at 50% rh [with an optional dehumidifier aka
>> latent heat pump upstairs] , and heat 137 cfm of 30 f air to 70 f at
>> a cost of about 1 gallon of oil per day. 
>> 
>> what does he do?
>>
>> nick

>dave has it right.   it costs pennies to run a humidifier.  if you wish to 
>discuss this further, lets take this to alt.hvac.

ok. i'll also add the vapor gurus at sci.engr.heat-vent-ac...

>you are still applying heat to water with your math,

righto.

>and water vapor is not a liquid, it is a gas.

an excellent thought. how do you suppose it becomes a gas?

would "physics for dummies" be over your head? :-)

nick




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