Heat water with a window AC?
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News wrote:
I'm still thinking about heating water with 1/3 the usual energy
using a Haier 5K Btu/h window AC ($84 at Wal-Mart.) The pipes connect
to the condenser coil at the top, so we could build a thin aquarium
around it with no replumbing or recharging and pump 1.5 gpm of 110 F
water out through a $168 Doucette SB1-20 400 Btu/h-F plate heat
exchanger with a 110 F thermostat and pump 60 F cold water into
the other side of the heat exchanger from a cold kitchen tap and back
into the hot tap, and dump some hot water from the hot tap into the
sink with a solenoid valve if the cold tap ever reaches say, 100 F,
when/if the tank water heater completely fills. Heating 50 gallons
of 60 F water to 110 takes about 21K Btu, and the AC would make about
5000(1+1/3) = 6700 Btu/h, so we might fill the tank in 3 hours,
with no hot water use.
Nick, can you explain a little more here. Are you saying pump from a hot
water tank the cooler water at the bottom through plate heat exchanger and
into the top of the hot water tank? A loop through the hot water tank?
Yes, with an existing conventional tank water heater. Powertech, Ltd has
an air conditioner something like this...
Nick
That they do.
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