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sioz1
03-10-2016, 06:20 AM
Hello guys ,

My question which is about condensing temperature that, When I selecting condenser I writing Condesing temperature 45C and evopretor temperature 7 (for R410A)
If I write 50C instead of 45C, I cansee capacity of condense ris increasing, but what is changing for for compressor , how does change compressor efficinnt?
or what is changing for the system?

mikeref
03-10-2016, 08:32 AM
Higher Ambient temperature means there is a limit to Condenser outlet Liquid temperature. Condenser outlet ( Liquid Line) can not be below Ambient with an air cooled Condenser. Lower outside air temperatures lowers the Liquid temperature and Pressure. Lowers power needed to run the Compressor.

sioz1
03-10-2016, 09:09 AM
Hello again , I mean that;
R410A condensing temperature 48C, evoperating temperaure 7C , superheat 3C and subcooling 5C

I have a evoprator and my air entry temperature 26,5 I am selecting a evoperator which is capacity 11,5 kw ann air outlet temperature 17,3C
according evoperator capacity I am selecting compressor capacity 13,75, power input 3,64

My condender should be 3,64+11,5 =15,14kW

according to theese condition (R410A condensing temperature 48C, evoperating temperaure 7C , superheat 3C and subcooling 5C) I can select a condenser and its capacity 15,3 but it is becoming a bit large (number of row is a bit big)
When ı changing condensing temperature and when I did its 50C condenser capasity is inceasing and ı can reduce its number of row.

My question when I did 50C there will be change for compressor?

mikeref
04-10-2016, 09:28 AM
Higher ambient ( 45 to 50C ) requires a larger capacity Condenser. That could mean a larger surface area or an increase of rows meaning condenser density. Higher ambient reduces the ability of any refrigeration or Air-conditioning condensers.

50 Degrees C Ambient would push Head pressure to 2840 Kpa. ( 412+ PSI ) using R410a. That figure is beyond anything i have had to service. Having said that, i would have a Bypass from the liquid line to the Suction inlet using a TX rated 01 while using the same Compressor.

sioz1
04-10-2016, 07:40 PM
Higher ambient ( 45 to 50C ) requires a larger capacity Condenser. That could mean a larger surface area or an increase of rows meaning condenser density. Higher ambient reduces the ability of any refrigeration or Air-conditioning condensers.

50 Degrees C Ambient would push Head pressure to 2840 Kpa. ( 412+ PSI ) using R410a. That figure is beyond anything i have had to service. Having said that, i would have a Bypass from the liquid line to the Suction inlet using a TX rated 01 while using the same Compressor.

and I see that, When I select condenser and when I write condesing temperature 50C instead of 45C the compressor power input is increasing althought its capacity reducing .

I have a questing if you answer I'd be happy ;
whats is difrence between using one and two compressor ?

Magoo
05-10-2016, 02:38 AM
The higher the compression ratio of a compressor the more energy consumed to achieve design SST and less effective cooling capacity, the COP drops as well.