capacity

[serviceman]

question:

I have a machine Frick RXF-85 OF 170 TR ammonia that I installed capacity condenser, I install a plate heat exchanger.

thanks

[Mark Selby]

Are you needing help or just letting us know?? I work with approx. 15 RXF85's a month if you have a question please ask I would love to help you..

[serviceman]

I have doubts as to the heat exchanger. what capacity should I install? conditions are temp. water 30 ° c and 37 ° c output

[Magoo]

With those water temps you will be having high discharge pressure problems. The problem would seem to be with the cooling tower, undersized or overloaded. Maybe the compressor is loading too quick during pull down.

[serviceman]

magoo:

what would your recommendation, we have an outside temperature of 42 ° c

[Josip]

Hi, serviceman

magoo:

what would your recommendation, we have an outside temperature of 42 ° c

and relative humidity very low ....

.... then your wet bulb temperature will be around 25-26*C or lower ... with good cooling tower your can have condensing temperature lower or up to 35*C what is still good ... very good ... OK not the best

assuming you are in hot and dry area of Mexico ....


check your cooling tower as per Magoo's suggestion....



Best regards, Josip

[serviceman]

josip

area of mexico 80% rh

[Magoo]

With 42 'C ambient and 80% RH. That is a problem. Can you lower the rise across condenser from 7'K to 5.0> 5.5'K by increasing water flow rate, that will drop the SDT slightly. If the make up water temp is lower again try over filling basin.

[Mark Selby]

Im in Houston TX and we have same humidity and close to same outside temps as the others said above I would look at the condenser but I do have a cpl other questions. What does your suction psi run and is this compressor a econamized unit, also I would like to ask what type of plant it is..