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Re: Desuperheating by liquid injection
First: if you want LRi on the LRI port of the compressor, wich is at the end of the compression, you NEED TO HAVE A PUMP, to supply the refrigerant to the TEAT valve, because the pressure at the end of the compressor compression is higher than the condenser pressure if you have a "normal system with a PM valve between the compressor and the condenser... you can have a discharge pressure of 30C, and a condensing pressure of 20C on a system with a VFD controlled condenser pump...
Second: I don't get this... if I am supplying "evaporated liquid" from the condenser as compared to gas from the economizer tank, what is the difference? there will be extra work on the compressor no matter what... So normally the economizer supplies the economizer port with gas at around -10C... There is extra load on the compressor in either case, how is the load from the LRI introduced in the economizer port different from the gas introduced to the LRI port?
I have seen a howden 255 with an economizer fitted, where the economizer valve opened when the compressor was at 100% and it was injected with -10C gas where the compressor almost took a bow and called it a night... so we had to introduce the economizer at -25 and slowly raise it to -10.
Third: The LRI port only works if you have a pump feeding refrigerant to the TEAT
if you want an economically working LRI, you have to use the economizer port... because the condensing pressure is lower than the pressure at the compressors "LRI stage"-Cheers-
Tycho