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Date: Wed, 2 Mar 2005 18:39:29 -0700
From: Bob White <bob@bob-white.com>
To: FlyRotary <flyrotary@lancaironline.net>
Subject: EWP Test Resulsts
Message-Id: <20050302183929.06e54079.bob@bob-white.com>
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Today, I finally got everything connected for the EWP tests.  My setup
is two evaporator cores in parallel, one EWP from each core using 3/4
inch dia hose and AN12 fittings.  The pumps connect to a Racing Beat
adaptor (the one with two AN12 fittings on the input.  The output went
directly to the flow meter with 1 inch hose and AN16 fittings.  The
output of the flow meter is 1 inch hose and AN16 fittings to an AN16
'T' which feeds the top of each core.  There is also a small hose
outlet at the rear of the engine which used to be connected somewhere
around the water pump.  I have it connected with a 3/8 inch hose to the
top of the expansion tank.  This line bypasses some of the flow around
the flow meter, so I sealed it off for these measurements.

Here is the raw data without any corrections for anything.  Data is
Voltage, current, flow, and temperature.  Temperature was measured with
a thermocouple on the output fitting on the engine just before the flow
meter.

Pump A Only:

13.8 V   8.2 A   5.75 GPM  56 F
12.0 V   6.8 A   4.5   GPM  56 F
13.0 V   7.7 A   5.25 GPM  56 F
14.0 V   8.4 A   6      GPM  56 F
14.5 V   8.8 A   6      GPM  56 F

Pump B Only:
14.5 V   9.6 A   5.75 GPM  56 F
14.0 V   9.1 A   6      GPM  56 F
14.5 V   9.5 A   6.25 GPM  56 F  (The guage was sticking a bit)
13.0 V   8.3 A   5.5   GPM  56 F
12.0 V   7.5 A   5.25 GPM  56 F

Pumps A and B:
12.0 V   13.6 A   10.5   GPM  56 F
13.0 V   14.8 A   11      GPM  56 F
13.8 V   16.0 A   11.75 GPM  56 F
14.5 V   16.6 A   12.4   GPM  56 F
12.0 V   13.4 A   10.5    GPM 56 F

I tried to heat the water with a heat gun, and a 16,000 BTU space
heater.   aimed at one of the radiators.  After 15 minutes, there was
very little temperature change.  It didn't look like I would get any
data at a significantly different temperature.  There is just too much
mass to change temperature very much.  (Without the engine running of
course.)

There is also a good possibility that the pumps in series will flow at
a higher rate.  I will have to see about reconfiguring for that.  Right
now, I'm not real pleased with these big AN fittings.  Nothing fit
right.  I ended up with a major mess of spaghetti where it was
difficult to get to all of the fittings.  Next time, I will use the
reusable fittings and make them in place.

Rusty,

I will be very interested in your Craig-Davies experiment.  It seems to
me that this flow rate is very marginal.  I had considered using a
single Mezirie WP336, but thought having two pumps for redundency would
be preferable.  Earlier I tested the unrestricted flow rate for one of
these pumps at 16 GPM using cold water.  The only way it could meet
specifications would be to see an increase in flow at higher
temperatures.

Bob W.


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