Quote:
Originally Posted by jeff5may
Pegasus,
Have you measured your heat transfer?
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No, I haven't measured the heat transfer yet, I plan to install a heat metering device in the next set-up. I am guessing though, I am not utilising all of the evaporator for two reasons :
a) On the first run with R-22, I was getting water chilled down to 19 deg C and on the other end, the discharge temperature was in the range of 70 deg C.
b) Now with R-290 I am getting 20 deg C (with less heat load!) and a discharge temp ~50 deg C. This indicates that there is less heat pumped than with R-22.
I have added more propane (~ 800 gr in total) because I thought that the liquid might be pooling in to the condenser since it is sitting lower (into the barrel). I now have a subcool of about 18 deg C without lowering the chilled water temp but with rising the compressor Amps by ~ 0.5 A
I followed the trouble shooter and since the pressures seem OK it points to "liquid restriction" witch in my case would be either the filter or the TXV orifice.
When I changed from R-22 to R-290 I didn't change the filter, could it be blocked?
Is the R-407 filter suitable for R-290?
Attached are a few more doc's.