Martin K. wrote:
>
> The delta-temp for A/C is going to be something like 90F hot
> to 55F cold (35 degrees)

Wow, 55 deg F is a really cold room and way past the guidelines
for energy saving of cooling to 75 deg F.

But here in Southern California (Inland Empire or desert) or
Las Vegas or Phoenix, your 35 deg F delta-T IS correct due to
mid-day summer temperatures that can hit 100 to 110 deg F.  I
have experienced such outdoor temperatures [ and don't mind
them -- just don't touch any exposed metal surfaces :-) ].

> For water heating it will be something like 90F to 135F - so
> the delta-T isn't that different.

I don't know where you get the base temperature of 90 deg F.
Everywhere I ever ran a wet process darkroom the cold water
out of the tap was about 55 deg F.  I don't expect that has
changed in the last few years.  So the delta-T for hot water
(assuming 120 deg F set point) would be about 65 deg F --
almost twice the delta-T compared to air conditioning.

						Lee Jones
--=20
http://www.piclist.com PIC/SX FAQ & list archive
View/change your membership options at
http://mailman.mit.edu/mailman/listinfo/piclist
.