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for those 95+ deg days
"DS King" wrote How do you get the evap & condensing temps? Very few AC units have that kind of instrumentation. Doug, the original unit is a $90 window shaker from Walmart. I installed the pressure access ports after I removed the condensing coil. I had to braze the refrigerant line into my tube-in-tube, and I needed a way to purge with nitrogen while brazing, and then attach vacuum pump, and finally, charge the unit. So I had refrigeration gauges on the system during testing. I converted the pressures to saturated temps using the R-22 pressure temperature relationship charts. I also installed temperature sensing wells at various points in the system, and inserted thermocouples in them to get feedback. The superheat and subcooling values are calculated. I actually measured the gpm by opening the loop and measuring the volume against a stopwatch. The delta T on the water supported the actual gpm of the closed loop. After testing I removed all but an ammeter and a discharge air thermometer. Also curious: how many feet of copper tubing in your secondary heat exchanger? about 22' I shaped it as a triangle for storage purposes, 18" per side, about 5 rows deep. The delta T I referred to is in/out of exchangers. The delta T for 'baywater' vs cooling water is about 10 degrees. Scout |
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