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Re: Solar water heating system value - Page 38

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Posted by dennis@home on March 10, 2006, 9:50 pm
 


Mine can too ( I think its upto 80C though).
It is cheaper to run on cold and has no effect on cleaning ability.
It may save a few minutes.


The prewash and rinses are usually cold.
The final rinse is usually hot to speed up drying.



Posted by Doctor Drivel on March 10, 2006, 10:51 am
 


Some do. Mine does and it is pretty new.  Dishwashers now are cold fill only
as they now use more advanced detergents.  In yea olden dayes the dishwasher
was a large tray of water with powder like sand. It sand blasted the dishes
clean, hence why you could not put patterned plates in the things.  They use
a hell of a lot less water now, so heating up via electricity is viable.
Also, some dishwashers can be just a hot fill. This saves on electricity to
heat up (electricity is ~4 times more per kW than gas), but it uses hot
water for the rinse cycles.  Even so it is still cheaper overall using the
hot only fill.


Posted by Guy King on March 10, 2006, 1:00 pm
 

Mine certainly does.

The trouble is they draw water from hot /and/ cold when hot is required
- for two reasons. 1) There may be no hot water connected 2) The hot
water may be too hot.

I've throttled the cold supply right back on mine so it fills
preferrentially from the hot supply 'cos I know there's always hot
water. One day I might play with the innards and a relay or two such
that when /both/ valves are intended to be on, only the hot supply is
opened, and when only one of the other is on things are as expected.

--
Skipweasel
Pay no attention to the man behind the curtain.

Posted by Doctor Drivel on March 10, 2006, 1:35 pm
 

Yep. The controls are designed for the worst case example.


Posted by David Hansen on March 10, 2006, 2:19 pm
 On Fri, 10 Mar 2006 13:00:40 GMT someone who may be Guy King


This could easily be solved with more complicated controls, which
would measure water temperatures. They would then use as much hot
water as possible, only adding cold if the hot was too hot for the
programme selected. No doubt manufacturers think this would cost too
much.

Equalising the pressure on the hot and cold sides, by feeding them
from the same source, can also reduce the enthusiasm of the cold
water.


--
  David Hansen, Edinburgh
 I will *always* explain revoked encryption keys, unless RIP prevents me
 http://www.opsi.gov.uk/acts/acts2000/00023--e.htm#54

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