Russell,
You're making a heat exchanger for a clothes dryer aren't you?

I thought about doing one for ours but the design of the dryer is not
real suitable for ducting the incoming air and I couldn't see how to
fit it in our laundry area without collecting water in the lowest
part.
Richard P

On 21/05/07, Russell McMahon <apptech@paradise.net.nz> wrote:
> This is both a request and a reference to resources:
>
> I'm looking for a set of algorithms which allow the characteristics of
> moist air to be determined.
> Lots of people seem keen to sell me books and programs on the subject
> and there are numerous online calculators covering the core variables.
>
> The essential algorithms which I'm after are here, courtesy of the
> ASHRAE handbook.
> This rather messy set of algorithms will probably allow most requisite
> calculations
>
>        http://www.ageng.ndsu.nodak.edu/envr/PsycEqns.htm
>
> Not rocket-science but annoyingly fiddly.
>
>
>
> Question: has anyone got any useful comments on the subject and/or
> practical useful algorithms for psychrometric or hygrometric
> calculations. These may be simplifications to or modifications of the
> ASHRAE algorithms or distilled arcane knowledge or ... .
>
>
>        Russell
>
> ____________________________
>
> Other resources:
>
>
> Online calculators of various capabilities
>
>        http://www.sugartech.co.za/psychro/index.php
>
>        http://www.linric.com/webpsysi.htm
>
>
> Books
>
> Distressingly thick book give the title :-) - "Understand
> Psychrometrics"
> Looks good
>
>    http://www.buildingsciencepress.com/books.asp?CatID=19
>
> Search list - hygrometry tables. For money.
>
>        http://www.worldcatlibraries.org/search?q=su%3AHygrometry+Tables.&qt=hot_subject
>
> Program $US169.
>
>        http://www.123supply.com/hdpsancdbene.html
>
> ASHRAE* Handbook.             * The 600 pound gorilla
>
>        http://www.ashrae.org/pressroom/detail/13624
>
> Psychrometric equations.
> Gargoyle says -
>
>        http://www.google.com/search?num=100&hl=en&rls=com.microsoft%3Aen-US&q=psychrometric+equations
>
>
> ________________________
>
> FWIW - The set of parameters that one usually wants to play with
> (taken from my 1st reference above) include enthalpy, latent heat of
> vaporization, heat of sublimation, humidity ratio, pressure,
> saturation vapor pressure, vapor pressure, relative humidity, dry bulb
> temperature, dewpoint temperature, wet bulb temperature, specific
> volume, saturation humidity ratio.
>
>
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